diff --git a/.forgejo/workflows/almalinux_8.yaml b/.forgejo/workflows/almalinux_8.yaml
index d871236..87a0f55 100644
--- a/.forgejo/workflows/almalinux_8.yaml
+++ b/.forgejo/workflows/almalinux_8.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: almalinux:8
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/almalinux_9.yaml b/.forgejo/workflows/almalinux_9.yaml
index cbe9501..5e1d9a6 100644
--- a/.forgejo/workflows/almalinux_9.yaml
+++ b/.forgejo/workflows/almalinux_9.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: almalinux:9
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/alpine_3.18.yaml b/.forgejo/workflows/alpine_3.18.yaml
index d7d2901..0ef9a45 100644
--- a/.forgejo/workflows/alpine_3.18.yaml
+++ b/.forgejo/workflows/alpine_3.18.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: alpine:3.18
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/alpine_3.19.yaml b/.forgejo/workflows/alpine_3.19.yaml
index 9d024fb..2aabd01 100644
--- a/.forgejo/workflows/alpine_3.19.yaml
+++ b/.forgejo/workflows/alpine_3.19.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: alpine:3.19
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/archlinux_base-20231112.0.191179.yaml b/.forgejo/workflows/archlinux_base-20231112.0.191179.yaml
index 8db1b9f..c39aa87 100644
--- a/.forgejo/workflows/archlinux_base-20231112.0.191179.yaml
+++ b/.forgejo/workflows/archlinux_base-20231112.0.191179.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: archlinux:base-20231112.0.191179
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/archlinux_base-20240101.0.204074.yaml b/.forgejo/workflows/archlinux_base-20240101.0.204074.yaml
index 196332f..ee468f6 100644
--- a/.forgejo/workflows/archlinux_base-20240101.0.204074.yaml
+++ b/.forgejo/workflows/archlinux_base-20240101.0.204074.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: archlinux:base-20240101.0.204074
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/debian_bookworm.yaml b/.forgejo/workflows/debian_bookworm.yaml
index 7d352ee..7e42f92 100644
--- a/.forgejo/workflows/debian_bookworm.yaml
+++ b/.forgejo/workflows/debian_bookworm.yaml
@@ -4,17 +4,17 @@ jobs:
     container:
       image: debian:bookworm
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
-    - run: spcd-synchronize
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
+    - run: pidd-synchronize
diff --git a/.forgejo/workflows/debian_bullseye.yaml b/.forgejo/workflows/debian_bullseye.yaml
index 079e567..18a2b61 100644
--- a/.forgejo/workflows/debian_bullseye.yaml
+++ b/.forgejo/workflows/debian_bullseye.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: debian:bullseye
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/fedora_39.yaml b/.forgejo/workflows/fedora_39.yaml
index 97cb898..5319b3d 100644
--- a/.forgejo/workflows/fedora_39.yaml
+++ b/.forgejo/workflows/fedora_39.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: fedora:39
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/fedora_40.yaml b/.forgejo/workflows/fedora_40.yaml
index df2d80f..cdae53b 100644
--- a/.forgejo/workflows/fedora_40.yaml
+++ b/.forgejo/workflows/fedora_40.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: fedora:40
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/rockylinux_8.yaml b/.forgejo/workflows/rockylinux_8.yaml
index 3c3137e..cccbda1 100644
--- a/.forgejo/workflows/rockylinux_8.yaml
+++ b/.forgejo/workflows/rockylinux_8.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: rockylinux:8
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/rockylinux_9.yaml b/.forgejo/workflows/rockylinux_9.yaml
index 7b031d7..6d65181 100644
--- a/.forgejo/workflows/rockylinux_9.yaml
+++ b/.forgejo/workflows/rockylinux_9.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: rockylinux:9
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/ubuntu_jammy.yaml b/.forgejo/workflows/ubuntu_jammy.yaml
index 6400eba..a33464a 100644
--- a/.forgejo/workflows/ubuntu_jammy.yaml
+++ b/.forgejo/workflows/ubuntu_jammy.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: ubuntu:jammy
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.forgejo/workflows/ubuntu_noble.yaml b/.forgejo/workflows/ubuntu_noble.yaml
index 13f08dc..96aaad0 100644
--- a/.forgejo/workflows/ubuntu_noble.yaml
+++ b/.forgejo/workflows/ubuntu_noble.yaml
@@ -4,16 +4,16 @@ jobs:
     container:
       image: ubuntu:noble
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        ${{vars.SPCD}}
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        ${{vars.PIDD}}
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
diff --git a/.github/workflows/debian:bookworm.yaml b/.github/workflows/debian:bookworm.yaml
index 6fea974..6018dd8 100644
--- a/.github/workflows/debian:bookworm.yaml
+++ b/.github/workflows/debian:bookworm.yaml
@@ -5,17 +5,17 @@ jobs:
     container:
       image: debian:bookworm
     steps:
-    - name: spcd
+    - name: pidd
       env:
-        SPCD_GIT_MAIN: ${{vars.SPCD_GIT_MAIN}}
-        SPCD_GIT_ROOT: ${{vars.SPCD_GIT_ROOT}}
+        PIDD_GIT_MAIN: ${{vars.PIDD_GIT_MAIN}}
+        PIDD_GIT_ROOT: ${{vars.PIDD_GIT_ROOT}}
       run: >
-        echo '${{vars.SPCD}}' | tr -d '\r' | sh -s
-        "${{secrets.SPCD_SSH_KEY}}"
-        "${{vars.SPCD_SSH_HOSTS}}"
+        echo '${{vars.PIDD}}' | tr -d '\r' | sh -s
+        "${{secrets.PIDD_SSH_KEY}}"
+        "${{vars.PIDD_SSH_HOSTS}}"
 
-    - run: spcd-list-environment
-    - run: spcd-clone-branch
-    - run: spcd-build-project
-    - run: spcd-browse-workspace
-    - run: spcd-synchronize
+    - run: pidd-list-environment
+    - run: pidd-clone-branch
+    - run: pidd-build-project
+    - run: pidd-browse-workspace
+    - run: pidd-synchronize
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00ef729..adab647 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -2,11 +2,11 @@ image: debian:bookworm
 job:
   script:
   - >
-    sh ${SPCD}
-    ${SPCD_SSH_KEY}
-    ${SPCD_SSH_HOSTS}
+    sh ${PIDD}
+    ${PIDD_SSH_KEY}
+    ${PIDD_SSH_HOSTS}
 
-  - spcd-list-environment
-  - spcd-clone-branch
-  - spcd-build-project
-  - spcd-browse-workspace
+  - pidd-list-environment
+  - pidd-clone-branch
+  - pidd-build-project
+  - pidd-browse-workspace
diff --git a/pidd.sh b/pidd.sh
new file mode 100644
index 0000000..0796472
--- /dev/null
+++ b/pidd.sh
@@ -0,0 +1,837 @@
+#! /usr/bin/env sh
+
+# defaults
+[ -n "${PIDD_DNS}" ] || PIDD_DNS="\
+9.9.9.9 \
+"
+[ -n "${PIDD_GIT_MAIN}" ] || PIDD_GIT_MAIN="pidd"
+[ -n "${PIDD_GIT_ROOT}" ] || PIDD_GIT_ROOT="rwx"
+
+# main
+pidd_main() {
+	pidd_list_environment_variables
+	pidd_list_working_directory
+	#
+	pidd_set_environment_variables
+	pidd_set_packages_repositories
+	pidd_set_packages_configuration
+	#
+	pidd_set_https_verification_off
+	pidd_set_dns_resolving
+	pidd_update_packages_catalog
+	pidd_install_packages_tools
+	pidd_install_ca_certificates
+	pidd_write_ca_certificates
+	pidd_update_ca_certificates
+	pidd_set_https_verification_on
+	pidd_update_packages_catalog
+	pidd_upgrade_packages
+	pidd_install_git
+	pidd_install_python
+	# TODO move to Python
+	pidd_install_rsync
+	# TODO move to Python
+	pidd_install_ssh
+	pidd_clean_packages_cache
+	pidd_install_python_modules
+	pidd_write_python_module
+	pidd_switch_to_python "${@}"
+}
+
+# context
+
+pidd_list_environment_variables() {
+	pidd_step "List environment variables"
+	for pidd_lev__name in $(printenv | cut -d = -f 1 | sort); do
+		pidd_lev__text=""
+		eval "pidd_lev__text=\"\${${pidd_lev__name}}\""
+		echo "${pidd_lev__name}=${pidd_lev__text}"
+	done
+}
+
+pidd_list_working_directory() {
+	pidd_step "List working directory"
+	pidd_lwd__path="$(realpath .)"
+	pidd_ls "${pidd_lwd__path}"
+}
+
+# steps
+
+pidd_set_environment_variables() {
+	pidd_step "Set environment variables"
+	# set path
+	PIDD_PATH="$(realpath "${0}")"
+	pidd_echo "PIDD_PATH"
+	# set operating system id
+	PIDD_OS_ID="$(pidd_grep_os ID)"
+	case "${PIDD_OS_ID}" in
+	"almalinux") PIDD_OS_ID="${PIDD_OS_ALMA}" ;;
+	"alpine") PIDD_OS_ID="${PIDD_OS_ALPINE}" ;;
+	"arch") PIDD_OS_ID="${PIDD_OS_ARCH}" ;;
+	"debian") PIDD_OS_ID="${PIDD_OS_DEBIAN}" ;;
+	"fedora") PIDD_OS_ID="${PIDD_OS_FEDORA}" ;;
+	"rocky") PIDD_OS_ID="${PIDD_OS_ROCKY}" ;;
+	"ubuntu") PIDD_OS_ID="${PIDD_OS_UBUNTU}" ;;
+	*) pidd_error_os "PIDD_OS_ID" ;;
+	esac
+	# set operating system version
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_FEDORA}" | "${PIDD_OS_ROCKY}" | \
+		"${PIDD_OS_ARCH}")
+		PIDD_OS_VERSION=$(pidd_grep_os VERSION_ID |
+			sed "s|^\([0-9]\+\)\..*|\1|")
+		;;
+	"${PIDD_OS_ALPINE}")
+		PIDD_OS_VERSION=$(pidd_grep_os VERSION_ID |
+			sed "s|^\([0-9]\+\.[0-9]\+\)\..*|\1|")
+		;;
+	"${PIDD_OS_DEBIAN}" | "${PIDD_OS_UBUNTU}")
+		PIDD_OS_VERSION="$(pidd_grep_os VERSION_CODENAME)"
+		;;
+	*) ;;
+	esac
+	# check operating system version
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_ROCKY}")
+		case "${PIDD_OS_VERSION}" in
+		"8" | "9") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	"${PIDD_OS_ALPINE}")
+		case "${PIDD_OS_VERSION}" in
+		"3.18" | "3.19") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	"${PIDD_OS_ARCH}")
+		case "${PIDD_OS_VERSION}" in
+		"20231112" | "20240101") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	"${PIDD_OS_DEBIAN}")
+		case "${PIDD_OS_VERSION}" in
+		"bookworm" | "bullseye") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	"${PIDD_OS_FEDORA}")
+		case "${PIDD_OS_VERSION}" in
+		"39" | "40") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	"${PIDD_OS_UBUNTU}")
+		case "${PIDD_OS_VERSION}" in
+		"jammy" | "noble") ;;
+		*) pidd_error_os "PIDD_OS_VERSION" ;;
+		esac
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_OS_ID" "PIDD_OS_VERSION"
+	# universal
+	PIDD_DNS_FILE="/etc/resolv.conf"
+	PIDD_PKG_CA="ca-certificates"
+	PIDD_PKG_GIT="git"
+	# TODO move to Python
+	PIDD_PKG_RSYNC="rsync"
+	PIDD_PYTHON_ALIAS="python3"
+	pidd_split
+	pidd_echo "PIDD_DNS_FILE" "PIDD_PKG_CA" "PIDD_PKG_GIT" "PIDD_PYTHON_ALIAS"
+	# set ca command & root
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_FEDORA}" | "${PIDD_OS_ROCKY}")
+		PIDD_CA_ROOT="/etc/pki/ca-trust/source/anchors"
+		PIDD_CMD_CA="update-ca-trust"
+		;;
+	"${PIDD_OS_ALPINE}")
+		PIDD_CA_ROOT="/usr/local/share/ca-certificates"
+		PIDD_CMD_CA="update-ca-certificates"
+		;;
+	"${PIDD_OS_ARCH}")
+		PIDD_CA_ROOT="/etc/ca-certificates/trust-source/anchors"
+		PIDD_CMD_CA="update-ca-trust"
+		;;
+	"${PIDD_OS_DEBIAN}" | "${PIDD_OS_UBUNTU}")
+		PIDD_CA_ROOT="/usr/local/share/ca-certificates"
+		PIDD_CMD_CA="update-ca-certificates"
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_CA_ROOT" "PIDD_CMD_CA"
+	# set package manager
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALPINE}")
+		PIDD_PM="${PIDD_PM_APK}"
+		;;
+	"${PIDD_OS_DEBIAN}" | "${PIDD_OS_UBUNTU}")
+		PIDD_PM="${PIDD_PM_APT}"
+		;;
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_FEDORA}" | "${PIDD_OS_ROCKY}")
+		PIDD_PM="${PIDD_PM_DNF}"
+		;;
+	"${PIDD_OS_ARCH}")
+		PIDD_PM="${PIDD_PM_PACMAN}"
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_PM"
+	case "${PIDD_PM}" in
+	"${PIDD_PM_DNF}")
+		PIDD_PM_CLEAN="dnf clean all"
+		PIDD_PM_INSTALL="dnf install --assumeyes"
+		PIDD_PM_QUERY="rpm --query"
+		PIDD_PM_UPDATE="dnf makecache"
+		PIDD_PM_UPGRADE="dnf upgrade --assumeyes"
+		PIDD_PKG_PKG=""
+		PIDD_PM_CONF_PATH="/etc/dnf/dnf.conf"
+		PIDD_PM_CONF_TEXT="\
+[main]
+best=True
+clean_requirements_on_remove=True
+gpgcheck=1
+installonly_limit=3
+skip_if_unavailable=False
+"
+		PIDD_PM_HTTPS_PATH="/etc/dnf/dnf.conf.d/https.conf"
+		PIDD_PM_HTTPS_TEXT="\
+sslverify=False
+"
+		;;
+	"${PIDD_PM_APK}")
+		PIDD_PM_CLEAN="apk cache purge"
+		PIDD_PM_INSTALL="apk add"
+		PIDD_PM_QUERY="apk info"
+		PIDD_PM_UPDATE="apk update"
+		PIDD_PM_UPGRADE="apk upgrade"
+		PIDD_PKG_PKG=""
+		PIDD_PM_CONF_PATH=""
+		PIDD_PM_CONF_TEXT=""
+		PIDD_PM_HTTPS_PATH="/etc/apk/repositories.d/https"
+		PIDD_PM_HTTPS_TEXT="\
+--no-verify
+"
+		;;
+	"${PIDD_PM_PACMAN}")
+		PIDD_PM_CLEAN="pacman --sync --clean --noconfirm"
+		PIDD_PM_INSTALL="pacman --sync --noconfirm"
+		PIDD_PM_QUERY="pacman --query"
+		PIDD_PM_UPDATE="pacman --sync --refresh"
+		PIDD_PM_UPGRADE="pacman --sync --sysupgrade --noconfirm"
+		PIDD_PKG_PKG=""
+		PIDD_PM_CONF_PATH=""
+		PIDD_PM_CONF_TEXT=""
+		PIDD_PM_HTTPS_PATH="/etc/pacman.d/https.conf"
+		PIDD_PM_HTTPS_TEXT="\
+SSLVerify = No
+"
+		;;
+	"${PIDD_PM_APT}")
+		PIDD_PM_CLEAN="apt-get clean"
+		PIDD_PM_INSTALL="apt-get install --assume-yes"
+		PIDD_PM_QUERY="dpkg-query --show"
+		PIDD_PM_UPDATE="apt-get update"
+		PIDD_PM_UPGRADE="apt-get upgrade --assume-yes"
+		PIDD_PKG_PKG="apt-utils"
+		PIDD_PM_CONF_PATH="/etc/apt/apt.conf.d/apt.conf"
+		PIDD_PM_CONF_TEXT="\
+Acquire::Check-Valid-Until True;
+APT::Get::Show-Versions True;
+APT::Install-Recommends False;
+APT::Install-Suggests False;
+Dir::Etc::SourceParts \"\";
+"
+		PIDD_PM_HTTPS_PATH="/etc/apt/apt.conf.d/https"
+		PIDD_PM_HTTPS_TEXT="\
+Acquire::https::Verify-Peer False;
+"
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_PM_CLEAN" \
+		"PIDD_PM_INSTALL" "PIDD_PM_QUERY" "PIDD_PM_UPDATE" "PIDD_PM_UPGRADE"
+	pidd_split
+	pidd_echo "PIDD_PKG_PKG" "PIDD_PM_CONF_PATH" "PIDD_PM_HTTPS_PATH"
+	# specific
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}")
+		PIDD_URL_DEFAULT="https://repo.almalinux.org/almalinux"
+		;;
+	"${PIDD_OS_ALPINE}")
+		PIDD_URL_DEFAULT="https://dl-cdn.alpinelinux.org/alpine"
+		;;
+	"${PIDD_OS_ARCH}")
+		PIDD_URL_DEFAULT="https://geo.mirror.pkgbuild.com"
+		;;
+	"${PIDD_OS_DEBIAN}")
+		PIDD_URL_DEFAULT="http://deb.debian.org/debian"
+		;;
+	"${PIDD_OS_FEDORA}")
+		PIDD_URL_DEFAULT="http://download.example/pub/fedora/linux/releases"
+		;;
+	"${PIDD_OS_ROCKY}")
+		PIDD_URL_DEFAULT="http://dl.rockylinux.org/\$contentdir"
+		;;
+	"${PIDD_OS_UBUNTU}")
+		PIDD_URL_DEFAULT="http://archive.ubuntu.com/ubuntu"
+		;;
+	*) ;;
+	esac
+	PIDD_URL_CHOSEN="${PIDD_URL_DEFAULT}"
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}")
+		[ -n "${PIDD_URL_ALMA}" ] && PIDD_URL_CHOSEN="${PIDD_URL_ALMA}"
+		;;
+	"${PIDD_OS_ALPINE}")
+		[ -n "${PIDD_URL_ALPINE}" ] && PIDD_URL_CHOSEN="${PIDD_URL_ALPINE}"
+		;;
+	"${PIDD_OS_ARCH}")
+		[ -n "${PIDD_URL_ARCH}" ] && PIDD_URL_CHOSEN="${PIDD_URL_ARCH}"
+		;;
+	"${PIDD_OS_DEBIAN}")
+		[ -n "${PIDD_URL_DEBIAN}" ] && PIDD_URL_CHOSEN="${PIDD_URL_DEBIAN}" ||
+			PIDD_URL_CHOSEN="https://deb.debian.org/debian"
+		;;
+	"${PIDD_OS_FEDORA}")
+		[ -n "${PIDD_URL_FEDORA}" ] && PIDD_URL_CHOSEN="${PIDD_URL_FEDORA}" ||
+			PIDD_URL_CHOSEN="https://rpmfind.net/linux/fedora/linux/releases"
+		;;
+	"${PIDD_OS_ROCKY}")
+		[ -n "${PIDD_URL_ROCKY}" ] && PIDD_URL_CHOSEN="${PIDD_URL_ROCKY}" ||
+			PIDD_URL_CHOSEN="https://dl.rockylinux.org/\$contentdir"
+		;;
+	"${PIDD_OS_UBUNTU}")
+		[ -n "${PIDD_URL_UBUNTU}" ] && PIDD_URL_CHOSEN="${PIDD_URL_UBUNTU}" ||
+			PIDD_URL_CHOSEN="https://ubuntu.mirrors.ovh.net/ubuntu"
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_URL_DEFAULT" "PIDD_URL_CHOSEN"
+	# set python command & package
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_ROCKY}")
+		PIDD_PYTHON_COMMAND="python3.11"
+		PIDD_PYTHON_PACKAGE="python3.11"
+		;;
+	"${PIDD_OS_ALPINE}")
+		PIDD_PYTHON_COMMAND="python3.11"
+		PIDD_PYTHON_PACKAGE="python3"
+		;;
+	"${PIDD_OS_ARCH}")
+		PIDD_PYTHON_COMMAND="python3.12"
+		PIDD_PYTHON_PACKAGE="python"
+		;;
+	"${PIDD_OS_DEBIAN}")
+		case "${PIDD_OS_VERSION}" in
+		"bookworm") PIDD_PYTHON_COMMAND="python3.11" ;;
+		"bullseye") PIDD_PYTHON_COMMAND="python3.9" ;;
+		*) ;;
+		esac
+		PIDD_PYTHON_PACKAGE="python3"
+		;;
+	"${PIDD_OS_FEDORA}")
+		PIDD_PYTHON_COMMAND="python3.12"
+		PIDD_PYTHON_PACKAGE="python3"
+		;;
+	"${PIDD_OS_UBUNTU}")
+		case "${PIDD_OS_VERSION}" in
+		"noble") PIDD_PYTHON_COMMAND="python3.12" ;;
+		"jammy") PIDD_PYTHON_COMMAND="python3.10" ;;
+		*) ;;
+		esac
+		PIDD_PYTHON_PACKAGE="python3"
+		;;
+	*) ;;
+	esac
+	# set python packages
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}" | "${PIDD_OS_FEDORA}" | "${PIDD_OS_ROCKY}")
+		PIDD_PYTHON_PACKAGES="/usr/lib64/${PIDD_PYTHON_COMMAND}/site-packages"
+		;;
+	"${PIDD_OS_ALPINE}" | "${PIDD_OS_ARCH}")
+		PIDD_PYTHON_PACKAGES="/usr/lib/${PIDD_PYTHON_COMMAND}/site-packages"
+		;;
+	"${PIDD_OS_DEBIAN}" | "${PIDD_OS_UBUNTU}")
+		PIDD_PYTHON_PACKAGES="/usr/lib/${PIDD_PYTHON_ALIAS}/dist-packages"
+		;;
+	*) ;;
+	esac
+	pidd_split
+	pidd_echo "PIDD_PYTHON_COMMAND" "PIDD_PYTHON_PACKAGE" "PIDD_PYTHON_PACKAGES"
+	# variables
+	[ -n "${PIDD_CA_1}" ] && PIDD_CA=true
+	# continuous integration platform
+	if [ -n "${GITHUB_ACTIONS}" ]; then
+		# github → gitea → forgejo
+		if [ -n "${GITHUB_SERVER_URL}" ]; then
+			PIDD_PROJECT_ROOT="$(dirname "${GITHUB_SERVER_URL}")//"
+			[ -n "${GITHUB_TOKEN}" ] &&
+				PIDD_PROJECT_ROOT="${PIDD_PROJECT_ROOT}${GITHUB_TOKEN}@"
+			PIDD_PROJECT_ROOT="${PIDD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
+		else
+			pidd_error_ci "GITHUB_SERVER_URL"
+		fi
+		if [ -n "${GITHUB_REPOSITORY}" ]; then
+			PIDD_PROJECT_PATH="$(dirname "${GITHUB_REPOSITORY}")"
+			PIDD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
+		else
+			pidd_error_ci "GITHUB_REPOSITORY"
+		fi
+		if [ -n "${GITHUB_REF_NAME}" ]; then
+			PIDD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
+		else
+			pidd_error_ci "GITHUB_REF_NAME"
+		fi
+	elif [ -n "${GITLAB_CI}" ]; then
+		# gitlab
+		if [ -n "${CI_SERVER_PROTOCOL}" ]; then
+			if [ -n "${CI_REGISTRY_USER}" ]; then
+				if [ -n "${CI_REGISTRY_PASSWORD}" ]; then
+					if [ -n "${CI_SERVER_FQDN}" ]; then
+						PIDD_PROJECT_ROOT="${CI_SERVER_PROTOCOL}\
+://${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}@${CI_SERVER_FQDN}"
+						if [ -n "${CI_PROJECT_NAMESPACE}" ]; then
+							PIDD_PROJECT_PATH="${CI_PROJECT_NAMESPACE}"
+							if [ -n "${CI_PROJECT_NAME}" ]; then
+								PIDD_PROJECT_NAME="${CI_PROJECT_NAME}"
+							else
+								pidd_error_ci "CI_PROJECT_NAME"
+							fi
+						else
+							pidd_error_ci "CI_PROJECT_NAMESPACE"
+						fi
+					else
+						pidd_error_ci "CI_SERVER_FQDN"
+					fi
+				else
+					pidd_error_ci "CI_REGISTRY_PASSWORD"
+				fi
+			else
+				pidd_error_ci "CI_REGISTRY_USER"
+			fi
+		else
+			pidd_error_ci "CI_SERVER_PROTOCOL"
+		fi
+		if [ -n "${CI_COMMIT_BRANCH}" ]; then
+			PIDD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
+		else
+			pidd_error_ci "CI_COMMIT_BRANCH"
+		fi
+	else
+		# unsupported
+		pidd_error_ci "ø"
+	fi
+	[ -n "${PIDD_PROJECT_ROOT}" ] || pidd_error_ci "PIDD_PROJECT_ROOT"
+	[ -n "${PIDD_PROJECT_PATH}" ] || pidd_error_ci "PIDD_PROJECT_PATH"
+	[ -n "${PIDD_PROJECT_NAME}" ] || pidd_error_ci "PIDD_PROJECT_NAME"
+	[ -n "${PIDD_PROJECT_BRANCH}" ] || pidd_error_ci "PIDD_PROJECT_BRANCH"
+	#
+	pidd_split
+	pidd_echo "PIDD_CA"
+	pidd_split
+	pidd_echo "PIDD_PROJECT_ROOT" \
+		"PIDD_PROJECT_PATH" "PIDD_PROJECT_NAME" "PIDD_PROJECT_BRANCH"
+	# TODO move to Python
+	case "${PIDD_PM}" in
+	"${PIDD_PM_APK}" | "${PIDD_PM_APT}") PIDD_PKG_SSH="openssh-client" ;;
+	"${PIDD_PM_DNF}") PIDD_PKG_SSH="openssh-clients" ;;
+	"${PIDD_PM_PACMAN}") PIDD_PKG_SSH="openssh" ;;
+	*) ;;
+	esac
+}
+
+pidd_set_packages_repositories() {
+	pidd_step "Set packages repositories"
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_ALMA}")
+		case "${PIDD_OS_VERSION}" in
+		"8") pidd_spr__file="/etc/yum.repos.d/almalinux.repo" ;;
+		"9") pidd_spr__file="/etc/yum.repos.d/almalinux-baseos.repo" ;;
+		*) ;;
+		esac
+		pidd_sed "${pidd_spr__file}" \
+			"|^mirrorlist|# mirrorlist|" \
+			"|${PIDD_URL_DEFAULT}|${PIDD_URL_CHOSEN}|" \
+			"|^# baseurl|baseurl|"
+		;;
+	"${PIDD_OS_ALPINE}")
+		pidd_spr__file="/etc/apk/repositories"
+		pidd_write "${pidd_spr__file}" "\
+${PIDD_URL_CHOSEN}/v${PIDD_OS_VERSION}/main
+${PIDD_URL_CHOSEN}/v${PIDD_OS_VERSION}/community
+"
+		;;
+	"${PIDD_OS_DEBIAN}")
+		pidd_spr__file="/etc/apt/sources.list"
+		pidd_write "${pidd_spr__file}" "\
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION} main
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION}-backports main
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION}-updates main
+deb ${PIDD_URL_CHOSEN}-security ${PIDD_OS_VERSION}-security main
+"
+		;;
+	"${PIDD_OS_ROCKY}")
+		case "${PIDD_OS_VERSION}" in
+		"8") pidd_spr__file="/etc/yum.repos.d/Rocky-BaseOS.repo" ;;
+		"9") pidd_spr__file="/etc/yum.repos.d/rocky.repo" ;;
+		*) ;;
+		esac
+		pidd_sed "${pidd_spr__file}" \
+			"|^mirrorlist|# mirrorlist|" \
+			"|${PIDD_URL_DEFAULT}|${PIDD_URL_CHOSEN}|" \
+			"|^#baseurl|baseurl|"
+		;;
+	"${PIDD_OS_UBUNTU}")
+		pidd_spr__file="/etc/apt/sources.list"
+		pidd_write "${pidd_spr__file}" "\
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION} main
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION}-backports main
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION}-updates main
+deb ${PIDD_URL_CHOSEN} ${PIDD_OS_VERSION}-security main
+"
+		;;
+	*) ;;
+	esac
+}
+
+pidd_set_packages_configuration() {
+	pidd_step "Set packages configuration"
+	pidd_write "${PIDD_PM_CONF_PATH}" "${PIDD_PM_CONF_TEXT}"
+	case "${PIDD_OS_ID}" in
+	"${PIDD_OS_DEBIAN}" | "${PIDD_OS_UBUNTU}")
+		export DEBIAN_FRONTEND="noninteractive"
+		;;
+	*) ;;
+	esac
+}
+
+# agnostic steps
+
+pidd_set_https_verification_off() {
+	if [ -n "${PIDD_CA}" ] || [ "${PIDD_PM}" = "${PIDD_PM_APT}" ]; then
+		pidd_step "Set HTTPS verification off"
+		pidd_mkdir "$(dirname "${PIDD_PM_HTTPS_PATH}")"
+		pidd_write "${PIDD_PM_HTTPS_PATH}" "${PIDD_PM_HTTPS_TEXT}"
+	fi
+}
+
+pidd_set_dns_resolving() {
+	pidd_step "Set DNS resolving"
+	for pidd_sdr__server in ${PIDD_DNS}; do
+		pidd_sdr__text="${pidd_sdr__text}\
+nameserver ${pidd_sdr__server}
+"
+	done
+	pidd_write "${PIDD_DNS_FILE}" "${pidd_sdr__text}"
+}
+
+pidd_update_packages_catalog() {
+	pidd_step "Update packages catalog"
+	${PIDD_PM_UPDATE} || exit
+}
+
+pidd_install_packages_tools() {
+	pidd_step "Install packages tools"
+	pidd_install_package "${PIDD_PKG_PKG}"
+}
+
+pidd_install_ca_certificates() {
+	pidd_step "Install CA"
+	pidd_install_package "${PIDD_PKG_CA}"
+}
+
+pidd_write_ca_certificates() {
+	pidd_step "Write CA certificates"
+	pidd_mkdir "${PIDD_CA_ROOT}"
+	pidd_wcc__index=1
+	eval "pidd_wcc__text=\"\${PIDD_CA_${pidd_wcc__index}}\""
+	while [ -n "${pidd_wcc__text}" ]; do
+		pidd_wcc__path="${PIDD_CA_ROOT}/${pidd_wcc__index}.crt"
+		pidd_split
+		pidd_write "${pidd_wcc__path}" "${pidd_wcc__text}"
+		pidd_openssl "${pidd_wcc__path}"
+		pidd_wcc__index=$((pidd_wcc__index + 1))
+		eval "pidd_wcc__text=\"\${PIDD_CA_${pidd_wcc__index}}\""
+	done
+}
+
+pidd_update_ca_certificates() {
+	pidd_step "Update CA certificates"
+	${PIDD_CMD_CA} || exit
+}
+
+pidd_set_https_verification_on() {
+	pidd_step "Set HTTPS verification on"
+	pidd_rm "${PIDD_PM_HTTPS_PATH}"
+}
+
+pidd_upgrade_packages() {
+	pidd_step "Upgrade packages"
+	${PIDD_PM_UPGRADE} || exit
+}
+
+pidd_install_git() {
+	pidd_step "Install Git"
+	pidd_install_package "${PIDD_PKG_GIT}"
+}
+
+pidd_install_python() {
+	pidd_step "Install Python"
+	pidd_install_package "${PIDD_PYTHON_PACKAGE}"
+	pidd_split
+	pidd_ln_python "${PIDD_PYTHON_COMMAND}"
+}
+
+# TODO move to Python
+pidd_install_rsync() {
+	pidd_step "Install Rsync"
+	pidd_install_package "${PIDD_PKG_RSYNC}"
+}
+
+# TODO move to Python
+pidd_install_ssh() {
+	pidd_step "Install SSH"
+	pidd_install_package "${PIDD_PKG_SSH}"
+}
+
+pidd_clean_packages_cache() {
+	pidd_step "Clean packages cache"
+	${PIDD_PM_CLEAN} || exit
+}
+
+pidd_install_python_modules() {
+	pidd_step "Install Python modules"
+	pidd_ipm__root="$(mktemp --directory)" || exit
+	echo "→ ${pidd_ipm__root}"
+	for pidd_ipm__repository in "${PIDD_GIT_MAIN}" "${PIDD_GIT_ROOT}"; do
+		case "${pidd_ipm__repository}" in
+		http*) pidd_ipm__url="${pidd_ipm__repository}" ;;
+		/*) pidd_ipm__url="${PIDD_PROJECT_ROOT}${pidd_ipm__repository}" ;;
+		*) pidd_ipm__url="\
+${PIDD_PROJECT_ROOT}/${PIDD_PROJECT_PATH}/${pidd_ipm__repository}" ;;
+		esac
+		pidd_ipm__name="$(basename "${pidd_ipm__url}")"
+		pidd_split
+		echo "\
+${pidd_ipm__url}
+↓"
+		git clone \
+			"${pidd_ipm__url}" \
+			"${pidd_ipm__root}/${pidd_ipm__name}" ||
+			exit
+		pidd_ipm__path="${pidd_ipm__root}/${pidd_ipm__name}/${pidd_ipm__name}"
+		echo "\
+${pidd_ipm__path}
+↓
+${PIDD_PYTHON_PACKAGES}"
+		cp --recursive "${pidd_ipm__path}" "${PIDD_PYTHON_PACKAGES}" ||
+			exit
+	done
+	pidd_split
+	pidd_ls "${PIDD_PYTHON_PACKAGES}"
+	pidd_split
+	pidd_rm "${pidd_ipm__root}"
+}
+
+pidd_write_python_module() {
+	pidd_step "Write Python module"
+	for pidd_wpm__variable in \
+		OS_ID OS_VERSION \
+		PROJECT_ROOT PROJECT_PATH PROJECT_NAME \
+		OPEN DOWN VERT SPLT __UP SHUT; do
+		pidd_wpm__value="$(pidd_echo "PIDD_${pidd_wpm__variable}")"
+		pidd_wpm__text="${pidd_wpm__text}${pidd_wpm__value}
+"
+	done
+	pidd_write "${PIDD_PYTHON_PACKAGES}/env.py" "${pidd_wpm__text}
+PIDD_STEP = $((PIDD_STEP + 1))
+"
+}
+
+pidd_switch_to_python() {
+	pidd_step "Switch to Python"
+	pidd_stp__name="$(basename "${PIDD_GIT_MAIN}")"
+	echo "\
+${PIDD_PATH}
+↓
+${PIDD_PYTHON_PACKAGES}/${pidd_stp__name}"
+	"${PIDD_PYTHON_ALIAS}" -m "${pidd_stp__name}" "${@}"
+}
+
+# functions
+
+pidd_cat() {
+	pidd_cat__file="${1}"
+	if [ -n "${pidd_cat__file}" ]; then
+		pidd_open "${pidd_cat__file}"
+		cat "${pidd_cat__file}" || exit
+		pidd_shut "${pidd_cat__file}"
+	fi
+}
+
+pidd_echo() {
+	if [ -n "${1}" ]; then
+		for pidd_echo__name in "${@}"; do
+			pidd_echo__text=""
+			eval "pidd_echo__text=\"\${${pidd_echo__name}}\""
+			echo "${pidd_echo__name} = \"${pidd_echo__text}\""
+		done
+	fi
+}
+
+pidd_error_ci() {
+	echo "× CI: ${*}"
+	exit "${PIDD_ERROR_CI}"
+}
+
+pidd_error_os() {
+	pidd_error_os__variable="${1}"
+	printf "× OS: "
+	pidd_echo "${pidd_error_os__variable}"
+	exit "${PIDD_ERROR_OS}"
+}
+
+pidd_grep_os() {
+	pidd_grep_os__variable="${1}"
+	[ -n "${pidd_grep_os__variable}" ] &&
+		grep "^${pidd_grep_os__variable}=" "/etc/os-release" |
+		sed "s|^${pidd_grep_os__variable}=||" |
+			sed "s|^\"\(.*\)\"$|\1|"
+}
+
+pidd_install_package() {
+	pidd_install_package__name="${1}"
+	if [ -n "${pidd_install_package__name}" ]; then
+		${PIDD_PM_INSTALL} "${pidd_install_package__name}" || exit
+	fi
+}
+
+pidd_ln_python() {
+	pidd_ln_python__command="${1}"
+	if [ -n "${pidd_ln_python__command}" ]; then
+		echo "→ ${PIDD_PYTHON_ALIAS} → ${pidd_ln_python__command}"
+		ln -f -s "${pidd_ln_python__command}" \
+			"/usr/bin/${PIDD_PYTHON_ALIAS}" || exit
+	fi
+}
+
+pidd_ls() {
+	pidd_ls__path="${1}"
+	if [ -n "${pidd_ls__path}" ]; then
+		pidd_open "${pidd_ls__path}"
+		ls -a -l "${pidd_ls__path}" || exit
+		pidd_shut "${pidd_ls__path}"
+	fi
+}
+
+pidd_mkdir() {
+	pidd_mkdir__path="${1}"
+	if [ -n "${pidd_mkdir__path}" ]; then
+		echo "→ ${pidd_mkdir__path}"
+		mkdir --parents "${pidd_mkdir__path}" || exit
+	fi
+}
+
+pidd_open() {
+	echo "${PIDD_OPEN}${*}"
+}
+
+pidd_openssl() {
+	pidd_openssl__file="${1}"
+	if [ -f "${pidd_openssl__file}" ]; then
+		openssl x509 \
+			-in "${pidd_openssl__file}" \
+			-noout -text ||
+			exit
+	fi
+}
+
+pidd_rm() {
+	pidd_rm__path="${1}"
+	if [ -e "${pidd_rm__path}" ]; then
+		echo "← ${pidd_rm__path}"
+		rm -r "${pidd_rm__path}" || exit
+	fi
+}
+
+pidd_sed() {
+	pidd_sed__file="${1}"
+	shift
+	if [ -f "${pidd_sed__file}" ]; then
+		pidd_cat "${pidd_sed__file}"
+		for pidd_sed__regex in "${@}"; do
+			sed --in-place "s${pidd_sed__regex}g" "${pidd_sed__file}" &&
+				pidd_cat "${pidd_sed__file}" || exit
+		done
+	fi
+}
+
+pidd_shut() {
+	echo "${PIDD_SHUT}${*}"
+}
+
+pidd_split() {
+	echo "${PIDD_SPLT}"
+}
+
+pidd_step() {
+	PIDD_STEP=$((PIDD_STEP + 1))
+	echo "\
+${PIDD_DOWN}
+${PIDD_VERT} ${PIDD_STEP} ${*}
+${PIDD___UP}"
+}
+
+pidd_write() {
+	pidd_write__file="${1}"
+	pidd_write__text="${2}"
+	if [ -n "${pidd_write__file}" ]; then
+		[ -f "${pidd_write__file}" ] && pidd_cat "${pidd_write__file}"
+		echo "→ ${pidd_write__file}"
+		printf "%s" "${pidd_write__text}" >"${pidd_write__file}" || exit
+		pidd_cat "${pidd_write__file}"
+	fi
+}
+
+# constants
+
+PIDD_BOX_DOWN="╭"
+PIDD_BOX_LEFT="╴"
+PIDD_BOX_RIGHT="╶"
+PIDD_BOX_UP="╰"
+PIDD_BOX_VERTICAL="│"
+
+PIDD_ERROR_CI=2
+PIDD_ERROR_OS=1
+
+PIDD_OS_ALMA="alma"
+PIDD_OS_ALPINE="alpine"
+PIDD_OS_ARCH="arch"
+PIDD_OS_DEBIAN="debian"
+PIDD_OS_FEDORA="fedora"
+PIDD_OS_ROCKY="rocky"
+PIDD_OS_UBUNTU="ubuntu"
+
+PIDD_PM_APK="apk"
+PIDD_PM_APT="apt"
+PIDD_PM_DNF="dnf"
+PIDD_PM_PACMAN="pacman"
+
+PIDD_HORIZONTAL="────╌╌╌╌┄┄┄┄┈┈┈┈"
+
+PIDD_OPEN="${PIDD_BOX_DOWN}${PIDD_BOX_LEFT}"
+PIDD_DOWN="${PIDD_BOX_DOWN}${PIDD_HORIZONTAL}"
+PIDD_VERT="${PIDD_BOX_VERTICAL}"
+PIDD_SPLT="${PIDD_BOX_RIGHT}${PIDD_HORIZONTAL}"
+PIDD___UP="${PIDD_BOX_UP}${PIDD_HORIZONTAL}"
+PIDD_SHUT="${PIDD_BOX_UP}${PIDD_BOX_LEFT}"
+
+# run
+pidd_main "${@}"
diff --git a/spcd/__init__.py b/pidd/__init__.py
similarity index 81%
rename from spcd/__init__.py
rename to pidd/__init__.py
index 3a7c546..a025f92 100644
--- a/spcd/__init__.py
+++ b/pidd/__init__.py
@@ -10,12 +10,12 @@ import env
 from rwx import fs
 from rwx.log import stream as log
 
-import spcd
-from spcd import cmd
-from spcd.project import Project
-from spcd.projects import Projects
+import pidd
+from pidd import cmd
+from pidd.project import Project
+from pidd.projects import Projects
 
-COMMANDS_PREFIX = "spcd-"
+COMMANDS_PREFIX = "pidd-"
 
 projects = Projects()
 project = Project(projects)
@@ -58,8 +58,8 @@ def main(main: str) -> None:
     path, *arguments = sys.argv
     name = Path(path).name
     if name == "__main__.py":
-        spcd.set_ssh(*arguments)
-        spcd.install_commands(main)
+        pidd.set_ssh(*arguments)
+        pidd.install_commands(main)
     else:
         function = getattr(cmd, name.replace("-", "_"))
         function(*arguments)
@@ -93,19 +93,19 @@ def set_ssh(*arguments: list[str]) -> None:
 
 
 def frame(text: str) -> None:
-    log.info(f"{env.SPCD_OPEN}{text}")
+    log.info(f"{env.PIDD_OPEN}{text}")
 
 
 def shut(text: str) -> None:
-    log.info(f"{env.SPCD_SHUT}{text}")
+    log.info(f"{env.PIDD_SHUT}{text}")
 
 
 def split() -> None:
-    log.info(env.SPCD_SPLT)
+    log.info(env.PIDD_SPLT)
 
 
 def step(text: str) -> None:
-    env.SPCD_STEP += 1
-    log.info(env.SPCD_DOWN)
-    log.info(f"{env.SPCD_VERT} {env.SPCD_STEP} {text}")
-    log.info(env.SPCD___UP)
+    env.PIDD_STEP += 1
+    log.info(env.PIDD_DOWN)
+    log.info(f"{env.PIDD_VERT} {env.PIDD_STEP} {text}")
+    log.info(env.PIDD___UP)
diff --git a/spcd/__main__.py b/pidd/__main__.py
similarity index 66%
rename from spcd/__main__.py
rename to pidd/__main__.py
index 424985f..db32c33 100755
--- a/spcd/__main__.py
+++ b/pidd/__main__.py
@@ -2,7 +2,7 @@
 
 """Entry point."""
 
-import spcd
+import pidd
 
 if __name__ == "__main__":
-    spcd.main(__file__)
+    pidd.main(__file__)
diff --git a/spcd/cmd.py b/pidd/cmd.py
similarity index 82%
rename from spcd/cmd.py
rename to pidd/cmd.py
index 6c55eb2..a2ea668 100644
--- a/spcd/cmd.py
+++ b/pidd/cmd.py
@@ -4,14 +4,14 @@ from pathlib import Path
 from rwx import ps, split
 from rwx.log import log
 
-from spcd import browse, project, projects
+from pidd import browse, project, projects
 
 
-def spcd_browse_workspace() -> None:
+def pidd_browse_workspace() -> None:
     browse(project.root)
 
 
-def spcd_build_project() -> None:
+def pidd_build_project() -> None:
     for extension in ["py", "sh"]:
         path = Path(project.root) / f"build.{extension}"
         if path.exists():
@@ -21,7 +21,7 @@ def spcd_build_project() -> None:
         pass
 
 
-def spcd_clone_branch() -> None:
+def pidd_clone_branch() -> None:
     log.info(projects)
     split()
     log.info(project)
@@ -41,12 +41,12 @@ def spcd_clone_branch() -> None:
     )
 
 
-def spcd_list_environment() -> None:
+def pidd_list_environment() -> None:
     for variable, value in sorted(projects.environment.items()):
         log.info(f"{variable} = {value}")
 
 
-def spcd_synchronize() -> None:
+def pidd_synchronize() -> None:
     host = "rwx.work"
     source = "out"
     user = "cd"
diff --git a/spcd/project.py b/pidd/project.py
similarity index 96%
rename from spcd/project.py
rename to pidd/project.py
index 7017d66..2bff2d8 100644
--- a/spcd/project.py
+++ b/pidd/project.py
@@ -7,7 +7,7 @@ from typing import TYPE_CHECKING
 from urllib.parse import urljoin
 
 if TYPE_CHECKING:
-    from spcd.projects import Projects
+    from pidd.projects import Projects
 
 BRANCH = [
     "GITHUB_REF_NAME",
diff --git a/spcd/projects.py b/pidd/projects.py
similarity index 100%
rename from spcd/projects.py
rename to pidd/projects.py
diff --git a/pyproject.toml b/pyproject.toml
index be22922..e48d346 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,11 +15,11 @@ classifiers = [
     "Operating System :: OS Independent",
 ]
 dependencies = ["rwx"]
-description = "Shell to Python Continuous Deployment"
+description = "Python Integration, Delivery & Deployment"
 dynamic = ["version"]
 keywords = []
 license-files = { paths = ["license.md"] }
-name = "spcd"
+name = "pidd"
 readme = "readme.md"
 requires-python = ">= 3.10"
 
@@ -29,7 +29,7 @@ requires-python = ">= 3.10"
 [project.urls]
 
 [tool.hatch.version]
-path = "spcd/__init__.py"
+path = "pidd/__init__.py"
 
 [tool.ruff]
 line-length = 80
diff --git a/readme.md b/readme.md
index 07c19b5..59798c3 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-# Shell to Python Continuous Deployment
+# Python Integration, Delivery & Deployment
 
 Get a common set of Python CI & CD commands \
 from various contexts of CA, CI and OCI / OS.
@@ -41,19 +41,19 @@ from various contexts of CA, CI and OCI / OS.
 
 | Variable        | Description             | Default                         |
 |:----------------|:------------------------|:--------------------------------|
-| SPCD_CA_n       | Numbered CA certificate |                                 |
-| SPCD_DNS        | Space separated servers | 9.9.9.9                         |
-| SPCD_GIT_MAIN   | Main Git repository     | spcd                            |
-| SPCD_GIT_ROOT   | Root Git repository     | rwx                             |
-| SPCD_SSH_HOSTS  | domain.tld ssh-type pub |                                 |
-| SPCD_SSH_KEY    | SSH private key         |                                 |
-| SPCD_URL_ALMA   | Alma repository URL     | https://repo.almalinux.org      |
-| SPCD_URL_ALPINE | Alpine repository URL   | https://dl-cdn.alpinelinux.org  |
-| SPCD_URL_ARCH   | Arch repository URL     | https://geo.mirror.pkgbuild.com |
-| SPCD_URL_DEBIAN | Debian repository URL   | https://deb.debian.org          |
-| SPCD_URL_FEDORA | Fedora repository URL   | https://rpmfind.net             |
-| SPCD_URL_ROCKY  | Rocky repository URL    | https://dl.rockylinux.org       |
-| SPCD_URL_UBUNTU | Ubuntu repository URL   | https://ubuntu.mirrors.ovh.net  |
+| PIDD_CA_n       | Numbered CA certificate |                                 |
+| PIDD_DNS        | Space separated servers | 9.9.9.9                         |
+| PIDD_GIT_MAIN   | Main Git repository     | pidd                            |
+| PIDD_GIT_ROOT   | Root Git repository     | rwx                             |
+| PIDD_SSH_HOSTS  | domain.tld ssh-type pub |                                 |
+| PIDD_SSH_KEY    | SSH private key         |                                 |
+| PIDD_URL_ALMA   | Alma repository URL     | https://repo.almalinux.org      |
+| PIDD_URL_ALPINE | Alpine repository URL   | https://dl-cdn.alpinelinux.org  |
+| PIDD_URL_ARCH   | Arch repository URL     | https://geo.mirror.pkgbuild.com |
+| PIDD_URL_DEBIAN | Debian repository URL   | https://deb.debian.org          |
+| PIDD_URL_FEDORA | Fedora repository URL   | https://rpmfind.net             |
+| PIDD_URL_ROCKY  | Rocky repository URL    | https://dl.rockylinux.org       |
+| PIDD_URL_UBUNTU | Ubuntu repository URL   | https://ubuntu.mirrors.ovh.net  |
 
 ## HTTPS & Python
 
diff --git a/spcd.sh b/spcd.sh
deleted file mode 100644
index efd89db..0000000
--- a/spcd.sh
+++ /dev/null
@@ -1,837 +0,0 @@
-#! /usr/bin/env sh
-
-# defaults
-[ -n "${SPCD_DNS}" ] || SPCD_DNS="\
-9.9.9.9 \
-"
-[ -n "${SPCD_GIT_MAIN}" ] || SPCD_GIT_MAIN="spcd"
-[ -n "${SPCD_GIT_ROOT}" ] || SPCD_GIT_ROOT="rwx"
-
-# main
-spcd_main() {
-	spcd_list_environment_variables
-	spcd_list_working_directory
-	#
-	spcd_set_environment_variables
-	spcd_set_packages_repositories
-	spcd_set_packages_configuration
-	#
-	spcd_set_https_verification_off
-	spcd_set_dns_resolving
-	spcd_update_packages_catalog
-	spcd_install_packages_tools
-	spcd_install_ca_certificates
-	spcd_write_ca_certificates
-	spcd_update_ca_certificates
-	spcd_set_https_verification_on
-	spcd_update_packages_catalog
-	spcd_upgrade_packages
-	spcd_install_git
-	spcd_install_python
-	# TODO move to Python
-	spcd_install_rsync
-	# TODO move to Python
-	spcd_install_ssh
-	spcd_clean_packages_cache
-	spcd_install_python_modules
-	spcd_write_python_module
-	spcd_switch_to_python "${@}"
-}
-
-# context
-
-spcd_list_environment_variables() {
-	spcd_step "List environment variables"
-	for spcd_lev__name in $(printenv | cut -d = -f 1 | sort); do
-		spcd_lev__text=""
-		eval "spcd_lev__text=\"\${${spcd_lev__name}}\""
-		echo "${spcd_lev__name}=${spcd_lev__text}"
-	done
-}
-
-spcd_list_working_directory() {
-	spcd_step "List working directory"
-	spcd_lwd__path="$(realpath .)"
-	spcd_ls "${spcd_lwd__path}"
-}
-
-# steps
-
-spcd_set_environment_variables() {
-	spcd_step "Set environment variables"
-	# set path
-	SPCD_PATH="$(realpath "${0}")"
-	spcd_echo "SPCD_PATH"
-	# set operating system id
-	SPCD_OS_ID="$(spcd_grep_os ID)"
-	case "${SPCD_OS_ID}" in
-	"almalinux") SPCD_OS_ID="${SPCD_OS_ALMA}" ;;
-	"alpine") SPCD_OS_ID="${SPCD_OS_ALPINE}" ;;
-	"arch") SPCD_OS_ID="${SPCD_OS_ARCH}" ;;
-	"debian") SPCD_OS_ID="${SPCD_OS_DEBIAN}" ;;
-	"fedora") SPCD_OS_ID="${SPCD_OS_FEDORA}" ;;
-	"rocky") SPCD_OS_ID="${SPCD_OS_ROCKY}" ;;
-	"ubuntu") SPCD_OS_ID="${SPCD_OS_UBUNTU}" ;;
-	*) spcd_error_os "SPCD_OS_ID" ;;
-	esac
-	# set operating system version
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}" | \
-		"${SPCD_OS_ARCH}")
-		SPCD_OS_VERSION=$(spcd_grep_os VERSION_ID |
-			sed "s|^\([0-9]\+\)\..*|\1|")
-		;;
-	"${SPCD_OS_ALPINE}")
-		SPCD_OS_VERSION=$(spcd_grep_os VERSION_ID |
-			sed "s|^\([0-9]\+\.[0-9]\+\)\..*|\1|")
-		;;
-	"${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-		SPCD_OS_VERSION="$(spcd_grep_os VERSION_CODENAME)"
-		;;
-	*) ;;
-	esac
-	# check operating system version
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}")
-		case "${SPCD_OS_VERSION}" in
-		"8" | "9") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	"${SPCD_OS_ALPINE}")
-		case "${SPCD_OS_VERSION}" in
-		"3.18" | "3.19") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	"${SPCD_OS_ARCH}")
-		case "${SPCD_OS_VERSION}" in
-		"20231112" | "20240101") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	"${SPCD_OS_DEBIAN}")
-		case "${SPCD_OS_VERSION}" in
-		"bookworm" | "bullseye") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	"${SPCD_OS_FEDORA}")
-		case "${SPCD_OS_VERSION}" in
-		"39" | "40") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	"${SPCD_OS_UBUNTU}")
-		case "${SPCD_OS_VERSION}" in
-		"jammy" | "noble") ;;
-		*) spcd_error_os "SPCD_OS_VERSION" ;;
-		esac
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_OS_ID" "SPCD_OS_VERSION"
-	# universal
-	SPCD_DNS_FILE="/etc/resolv.conf"
-	SPCD_PKG_CA="ca-certificates"
-	SPCD_PKG_GIT="git"
-	# TODO move to Python
-	SPCD_PKG_RSYNC="rsync"
-	SPCD_PYTHON_ALIAS="python3"
-	spcd_split
-	spcd_echo "SPCD_DNS_FILE" "SPCD_PKG_CA" "SPCD_PKG_GIT" "SPCD_PYTHON_ALIAS"
-	# set ca command & root
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
-		SPCD_CA_ROOT="/etc/pki/ca-trust/source/anchors"
-		SPCD_CMD_CA="update-ca-trust"
-		;;
-	"${SPCD_OS_ALPINE}")
-		SPCD_CA_ROOT="/usr/local/share/ca-certificates"
-		SPCD_CMD_CA="update-ca-certificates"
-		;;
-	"${SPCD_OS_ARCH}")
-		SPCD_CA_ROOT="/etc/ca-certificates/trust-source/anchors"
-		SPCD_CMD_CA="update-ca-trust"
-		;;
-	"${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-		SPCD_CA_ROOT="/usr/local/share/ca-certificates"
-		SPCD_CMD_CA="update-ca-certificates"
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_CA_ROOT" "SPCD_CMD_CA"
-	# set package manager
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALPINE}")
-		SPCD_PM="${SPCD_PM_APK}"
-		;;
-	"${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-		SPCD_PM="${SPCD_PM_APT}"
-		;;
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
-		SPCD_PM="${SPCD_PM_DNF}"
-		;;
-	"${SPCD_OS_ARCH}")
-		SPCD_PM="${SPCD_PM_PACMAN}"
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_PM"
-	case "${SPCD_PM}" in
-	"${SPCD_PM_DNF}")
-		SPCD_PM_CLEAN="dnf clean all"
-		SPCD_PM_INSTALL="dnf install --assumeyes"
-		SPCD_PM_QUERY="rpm --query"
-		SPCD_PM_UPDATE="dnf makecache"
-		SPCD_PM_UPGRADE="dnf upgrade --assumeyes"
-		SPCD_PKG_PKG=""
-		SPCD_PM_CONF_PATH="/etc/dnf/dnf.conf"
-		SPCD_PM_CONF_TEXT="\
-[main]
-best=True
-clean_requirements_on_remove=True
-gpgcheck=1
-installonly_limit=3
-skip_if_unavailable=False
-"
-		SPCD_PM_HTTPS_PATH="/etc/dnf/dnf.conf.d/https.conf"
-		SPCD_PM_HTTPS_TEXT="\
-sslverify=False
-"
-		;;
-	"${SPCD_PM_APK}")
-		SPCD_PM_CLEAN="apk cache purge"
-		SPCD_PM_INSTALL="apk add"
-		SPCD_PM_QUERY="apk info"
-		SPCD_PM_UPDATE="apk update"
-		SPCD_PM_UPGRADE="apk upgrade"
-		SPCD_PKG_PKG=""
-		SPCD_PM_CONF_PATH=""
-		SPCD_PM_CONF_TEXT=""
-		SPCD_PM_HTTPS_PATH="/etc/apk/repositories.d/https"
-		SPCD_PM_HTTPS_TEXT="\
---no-verify
-"
-		;;
-	"${SPCD_PM_PACMAN}")
-		SPCD_PM_CLEAN="pacman --sync --clean --noconfirm"
-		SPCD_PM_INSTALL="pacman --sync --noconfirm"
-		SPCD_PM_QUERY="pacman --query"
-		SPCD_PM_UPDATE="pacman --sync --refresh"
-		SPCD_PM_UPGRADE="pacman --sync --sysupgrade --noconfirm"
-		SPCD_PKG_PKG=""
-		SPCD_PM_CONF_PATH=""
-		SPCD_PM_CONF_TEXT=""
-		SPCD_PM_HTTPS_PATH="/etc/pacman.d/https.conf"
-		SPCD_PM_HTTPS_TEXT="\
-SSLVerify = No
-"
-		;;
-	"${SPCD_PM_APT}")
-		SPCD_PM_CLEAN="apt-get clean"
-		SPCD_PM_INSTALL="apt-get install --assume-yes"
-		SPCD_PM_QUERY="dpkg-query --show"
-		SPCD_PM_UPDATE="apt-get update"
-		SPCD_PM_UPGRADE="apt-get upgrade --assume-yes"
-		SPCD_PKG_PKG="apt-utils"
-		SPCD_PM_CONF_PATH="/etc/apt/apt.conf.d/apt.conf"
-		SPCD_PM_CONF_TEXT="\
-Acquire::Check-Valid-Until True;
-APT::Get::Show-Versions True;
-APT::Install-Recommends False;
-APT::Install-Suggests False;
-Dir::Etc::SourceParts \"\";
-"
-		SPCD_PM_HTTPS_PATH="/etc/apt/apt.conf.d/https"
-		SPCD_PM_HTTPS_TEXT="\
-Acquire::https::Verify-Peer False;
-"
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_PM_CLEAN" \
-		"SPCD_PM_INSTALL" "SPCD_PM_QUERY" "SPCD_PM_UPDATE" "SPCD_PM_UPGRADE"
-	spcd_split
-	spcd_echo "SPCD_PKG_PKG" "SPCD_PM_CONF_PATH" "SPCD_PM_HTTPS_PATH"
-	# specific
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}")
-		SPCD_URL_DEFAULT="https://repo.almalinux.org/almalinux"
-		;;
-	"${SPCD_OS_ALPINE}")
-		SPCD_URL_DEFAULT="https://dl-cdn.alpinelinux.org/alpine"
-		;;
-	"${SPCD_OS_ARCH}")
-		SPCD_URL_DEFAULT="https://geo.mirror.pkgbuild.com"
-		;;
-	"${SPCD_OS_DEBIAN}")
-		SPCD_URL_DEFAULT="http://deb.debian.org/debian"
-		;;
-	"${SPCD_OS_FEDORA}")
-		SPCD_URL_DEFAULT="http://download.example/pub/fedora/linux/releases"
-		;;
-	"${SPCD_OS_ROCKY}")
-		SPCD_URL_DEFAULT="http://dl.rockylinux.org/\$contentdir"
-		;;
-	"${SPCD_OS_UBUNTU}")
-		SPCD_URL_DEFAULT="http://archive.ubuntu.com/ubuntu"
-		;;
-	*) ;;
-	esac
-	SPCD_URL_CHOSEN="${SPCD_URL_DEFAULT}"
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}")
-		[ -n "${SPCD_URL_ALMA}" ] && SPCD_URL_CHOSEN="${SPCD_URL_ALMA}"
-		;;
-	"${SPCD_OS_ALPINE}")
-		[ -n "${SPCD_URL_ALPINE}" ] && SPCD_URL_CHOSEN="${SPCD_URL_ALPINE}"
-		;;
-	"${SPCD_OS_ARCH}")
-		[ -n "${SPCD_URL_ARCH}" ] && SPCD_URL_CHOSEN="${SPCD_URL_ARCH}"
-		;;
-	"${SPCD_OS_DEBIAN}")
-		[ -n "${SPCD_URL_DEBIAN}" ] && SPCD_URL_CHOSEN="${SPCD_URL_DEBIAN}" ||
-			SPCD_URL_CHOSEN="https://deb.debian.org/debian"
-		;;
-	"${SPCD_OS_FEDORA}")
-		[ -n "${SPCD_URL_FEDORA}" ] && SPCD_URL_CHOSEN="${SPCD_URL_FEDORA}" ||
-			SPCD_URL_CHOSEN="https://rpmfind.net/linux/fedora/linux/releases"
-		;;
-	"${SPCD_OS_ROCKY}")
-		[ -n "${SPCD_URL_ROCKY}" ] && SPCD_URL_CHOSEN="${SPCD_URL_ROCKY}" ||
-			SPCD_URL_CHOSEN="https://dl.rockylinux.org/\$contentdir"
-		;;
-	"${SPCD_OS_UBUNTU}")
-		[ -n "${SPCD_URL_UBUNTU}" ] && SPCD_URL_CHOSEN="${SPCD_URL_UBUNTU}" ||
-			SPCD_URL_CHOSEN="https://ubuntu.mirrors.ovh.net/ubuntu"
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_URL_DEFAULT" "SPCD_URL_CHOSEN"
-	# set python command & package
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_ROCKY}")
-		SPCD_PYTHON_COMMAND="python3.11"
-		SPCD_PYTHON_PACKAGE="python3.11"
-		;;
-	"${SPCD_OS_ALPINE}")
-		SPCD_PYTHON_COMMAND="python3.11"
-		SPCD_PYTHON_PACKAGE="python3"
-		;;
-	"${SPCD_OS_ARCH}")
-		SPCD_PYTHON_COMMAND="python3.12"
-		SPCD_PYTHON_PACKAGE="python"
-		;;
-	"${SPCD_OS_DEBIAN}")
-		case "${SPCD_OS_VERSION}" in
-		"bookworm") SPCD_PYTHON_COMMAND="python3.11" ;;
-		"bullseye") SPCD_PYTHON_COMMAND="python3.9" ;;
-		*) ;;
-		esac
-		SPCD_PYTHON_PACKAGE="python3"
-		;;
-	"${SPCD_OS_FEDORA}")
-		SPCD_PYTHON_COMMAND="python3.12"
-		SPCD_PYTHON_PACKAGE="python3"
-		;;
-	"${SPCD_OS_UBUNTU}")
-		case "${SPCD_OS_VERSION}" in
-		"noble") SPCD_PYTHON_COMMAND="python3.12" ;;
-		"jammy") SPCD_PYTHON_COMMAND="python3.10" ;;
-		*) ;;
-		esac
-		SPCD_PYTHON_PACKAGE="python3"
-		;;
-	*) ;;
-	esac
-	# set python packages
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}" | "${SPCD_OS_FEDORA}" | "${SPCD_OS_ROCKY}")
-		SPCD_PYTHON_PACKAGES="/usr/lib64/${SPCD_PYTHON_COMMAND}/site-packages"
-		;;
-	"${SPCD_OS_ALPINE}" | "${SPCD_OS_ARCH}")
-		SPCD_PYTHON_PACKAGES="/usr/lib/${SPCD_PYTHON_COMMAND}/site-packages"
-		;;
-	"${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-		SPCD_PYTHON_PACKAGES="/usr/lib/${SPCD_PYTHON_ALIAS}/dist-packages"
-		;;
-	*) ;;
-	esac
-	spcd_split
-	spcd_echo "SPCD_PYTHON_COMMAND" "SPCD_PYTHON_PACKAGE" "SPCD_PYTHON_PACKAGES"
-	# variables
-	[ -n "${SPCD_CA_1}" ] && SPCD_CA=true
-	# continuous integration platform
-	if [ -n "${GITHUB_ACTIONS}" ]; then
-		# github → gitea → forgejo
-		if [ -n "${GITHUB_SERVER_URL}" ]; then
-			SPCD_PROJECT_ROOT="$(dirname "${GITHUB_SERVER_URL}")//"
-			[ -n "${GITHUB_TOKEN}" ] &&
-				SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}${GITHUB_TOKEN}@"
-			SPCD_PROJECT_ROOT="${SPCD_PROJECT_ROOT}$(basename "${GITHUB_SERVER_URL}")"
-		else
-			spcd_error_ci "GITHUB_SERVER_URL"
-		fi
-		if [ -n "${GITHUB_REPOSITORY}" ]; then
-			SPCD_PROJECT_PATH="$(dirname "${GITHUB_REPOSITORY}")"
-			SPCD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
-		else
-			spcd_error_ci "GITHUB_REPOSITORY"
-		fi
-		if [ -n "${GITHUB_REF_NAME}" ]; then
-			SPCD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
-		else
-			spcd_error_ci "GITHUB_REF_NAME"
-		fi
-	elif [ -n "${GITLAB_CI}" ]; then
-		# gitlab
-		if [ -n "${CI_SERVER_PROTOCOL}" ]; then
-			if [ -n "${CI_REGISTRY_USER}" ]; then
-				if [ -n "${CI_REGISTRY_PASSWORD}" ]; then
-					if [ -n "${CI_SERVER_FQDN}" ]; then
-						SPCD_PROJECT_ROOT="${CI_SERVER_PROTOCOL}\
-://${CI_REGISTRY_USER}:${CI_REGISTRY_PASSWORD}@${CI_SERVER_FQDN}"
-						if [ -n "${CI_PROJECT_NAMESPACE}" ]; then
-							SPCD_PROJECT_PATH="${CI_PROJECT_NAMESPACE}"
-							if [ -n "${CI_PROJECT_NAME}" ]; then
-								SPCD_PROJECT_NAME="${CI_PROJECT_NAME}"
-							else
-								spcd_error_ci "CI_PROJECT_NAME"
-							fi
-						else
-							spcd_error_ci "CI_PROJECT_NAMESPACE"
-						fi
-					else
-						spcd_error_ci "CI_SERVER_FQDN"
-					fi
-				else
-					spcd_error_ci "CI_REGISTRY_PASSWORD"
-				fi
-			else
-				spcd_error_ci "CI_REGISTRY_USER"
-			fi
-		else
-			spcd_error_ci "CI_SERVER_PROTOCOL"
-		fi
-		if [ -n "${CI_COMMIT_BRANCH}" ]; then
-			SPCD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
-		else
-			spcd_error_ci "CI_COMMIT_BRANCH"
-		fi
-	else
-		# unsupported
-		spcd_error_ci "ø"
-	fi
-	[ -n "${SPCD_PROJECT_ROOT}" ] || spcd_error_ci "SPCD_PROJECT_ROOT"
-	[ -n "${SPCD_PROJECT_PATH}" ] || spcd_error_ci "SPCD_PROJECT_PATH"
-	[ -n "${SPCD_PROJECT_NAME}" ] || spcd_error_ci "SPCD_PROJECT_NAME"
-	[ -n "${SPCD_PROJECT_BRANCH}" ] || spcd_error_ci "SPCD_PROJECT_BRANCH"
-	#
-	spcd_split
-	spcd_echo "SPCD_CA"
-	spcd_split
-	spcd_echo "SPCD_PROJECT_ROOT" \
-		"SPCD_PROJECT_PATH" "SPCD_PROJECT_NAME" "SPCD_PROJECT_BRANCH"
-	# TODO move to Python
-	case "${SPCD_PM}" in
-	"${SPCD_PM_APK}" | "${SPCD_PM_APT}") SPCD_PKG_SSH="openssh-client" ;;
-	"${SPCD_PM_DNF}") SPCD_PKG_SSH="openssh-clients" ;;
-	"${SPCD_PM_PACMAN}") SPCD_PKG_SSH="openssh" ;;
-	*) ;;
-	esac
-}
-
-spcd_set_packages_repositories() {
-	spcd_step "Set packages repositories"
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_ALMA}")
-		case "${SPCD_OS_VERSION}" in
-		"8") spcd_spr__file="/etc/yum.repos.d/almalinux.repo" ;;
-		"9") spcd_spr__file="/etc/yum.repos.d/almalinux-baseos.repo" ;;
-		*) ;;
-		esac
-		spcd_sed "${spcd_spr__file}" \
-			"|^mirrorlist|# mirrorlist|" \
-			"|${SPCD_URL_DEFAULT}|${SPCD_URL_CHOSEN}|" \
-			"|^# baseurl|baseurl|"
-		;;
-	"${SPCD_OS_ALPINE}")
-		spcd_spr__file="/etc/apk/repositories"
-		spcd_write "${spcd_spr__file}" "\
-${SPCD_URL_CHOSEN}/v${SPCD_OS_VERSION}/main
-${SPCD_URL_CHOSEN}/v${SPCD_OS_VERSION}/community
-"
-		;;
-	"${SPCD_OS_DEBIAN}")
-		spcd_spr__file="/etc/apt/sources.list"
-		spcd_write "${spcd_spr__file}" "\
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION} main
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION}-backports main
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION}-updates main
-deb ${SPCD_URL_CHOSEN}-security ${SPCD_OS_VERSION}-security main
-"
-		;;
-	"${SPCD_OS_ROCKY}")
-		case "${SPCD_OS_VERSION}" in
-		"8") spcd_spr__file="/etc/yum.repos.d/Rocky-BaseOS.repo" ;;
-		"9") spcd_spr__file="/etc/yum.repos.d/rocky.repo" ;;
-		*) ;;
-		esac
-		spcd_sed "${spcd_spr__file}" \
-			"|^mirrorlist|# mirrorlist|" \
-			"|${SPCD_URL_DEFAULT}|${SPCD_URL_CHOSEN}|" \
-			"|^#baseurl|baseurl|"
-		;;
-	"${SPCD_OS_UBUNTU}")
-		spcd_spr__file="/etc/apt/sources.list"
-		spcd_write "${spcd_spr__file}" "\
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION} main
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION}-backports main
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION}-updates main
-deb ${SPCD_URL_CHOSEN} ${SPCD_OS_VERSION}-security main
-"
-		;;
-	*) ;;
-	esac
-}
-
-spcd_set_packages_configuration() {
-	spcd_step "Set packages configuration"
-	spcd_write "${SPCD_PM_CONF_PATH}" "${SPCD_PM_CONF_TEXT}"
-	case "${SPCD_OS_ID}" in
-	"${SPCD_OS_DEBIAN}" | "${SPCD_OS_UBUNTU}")
-		export DEBIAN_FRONTEND="noninteractive"
-		;;
-	*) ;;
-	esac
-}
-
-# agnostic steps
-
-spcd_set_https_verification_off() {
-	if [ -n "${SPCD_CA}" ] || [ "${SPCD_PM}" = "${SPCD_PM_APT}" ]; then
-		spcd_step "Set HTTPS verification off"
-		spcd_mkdir "$(dirname "${SPCD_PM_HTTPS_PATH}")"
-		spcd_write "${SPCD_PM_HTTPS_PATH}" "${SPCD_PM_HTTPS_TEXT}"
-	fi
-}
-
-spcd_set_dns_resolving() {
-	spcd_step "Set DNS resolving"
-	for spcd_sdr__server in ${SPCD_DNS}; do
-		spcd_sdr__text="${spcd_sdr__text}\
-nameserver ${spcd_sdr__server}
-"
-	done
-	spcd_write "${SPCD_DNS_FILE}" "${spcd_sdr__text}"
-}
-
-spcd_update_packages_catalog() {
-	spcd_step "Update packages catalog"
-	${SPCD_PM_UPDATE} || exit
-}
-
-spcd_install_packages_tools() {
-	spcd_step "Install packages tools"
-	spcd_install_package "${SPCD_PKG_PKG}"
-}
-
-spcd_install_ca_certificates() {
-	spcd_step "Install CA"
-	spcd_install_package "${SPCD_PKG_CA}"
-}
-
-spcd_write_ca_certificates() {
-	spcd_step "Write CA certificates"
-	spcd_mkdir "${SPCD_CA_ROOT}"
-	spcd_wcc__index=1
-	eval "spcd_wcc__text=\"\${SPCD_CA_${spcd_wcc__index}}\""
-	while [ -n "${spcd_wcc__text}" ]; do
-		spcd_wcc__path="${SPCD_CA_ROOT}/${spcd_wcc__index}.crt"
-		spcd_split
-		spcd_write "${spcd_wcc__path}" "${spcd_wcc__text}"
-		spcd_openssl "${spcd_wcc__path}"
-		spcd_wcc__index=$((spcd_wcc__index + 1))
-		eval "spcd_wcc__text=\"\${SPCD_CA_${spcd_wcc__index}}\""
-	done
-}
-
-spcd_update_ca_certificates() {
-	spcd_step "Update CA certificates"
-	${SPCD_CMD_CA} || exit
-}
-
-spcd_set_https_verification_on() {
-	spcd_step "Set HTTPS verification on"
-	spcd_rm "${SPCD_PM_HTTPS_PATH}"
-}
-
-spcd_upgrade_packages() {
-	spcd_step "Upgrade packages"
-	${SPCD_PM_UPGRADE} || exit
-}
-
-spcd_install_git() {
-	spcd_step "Install Git"
-	spcd_install_package "${SPCD_PKG_GIT}"
-}
-
-spcd_install_python() {
-	spcd_step "Install Python"
-	spcd_install_package "${SPCD_PYTHON_PACKAGE}"
-	spcd_split
-	spcd_ln_python "${SPCD_PYTHON_COMMAND}"
-}
-
-# TODO move to Python
-spcd_install_rsync() {
-	spcd_step "Install Rsync"
-	spcd_install_package "${SPCD_PKG_RSYNC}"
-}
-
-# TODO move to Python
-spcd_install_ssh() {
-	spcd_step "Install SSH"
-	spcd_install_package "${SPCD_PKG_SSH}"
-}
-
-spcd_clean_packages_cache() {
-	spcd_step "Clean packages cache"
-	${SPCD_PM_CLEAN} || exit
-}
-
-spcd_install_python_modules() {
-	spcd_step "Install Python modules"
-	spcd_ipm__root="$(mktemp --directory)" || exit
-	echo "→ ${spcd_ipm__root}"
-	for spcd_ipm__repository in "${SPCD_GIT_MAIN}" "${SPCD_GIT_ROOT}"; do
-		case "${spcd_ipm__repository}" in
-		http*) spcd_ipm__url="${spcd_ipm__repository}" ;;
-		/*) spcd_ipm__url="${SPCD_PROJECT_ROOT}${spcd_ipm__repository}" ;;
-		*) spcd_ipm__url="\
-${SPCD_PROJECT_ROOT}/${SPCD_PROJECT_PATH}/${spcd_ipm__repository}" ;;
-		esac
-		spcd_ipm__name="$(basename "${spcd_ipm__url}")"
-		spcd_split
-		echo "\
-${spcd_ipm__url}
-↓"
-		git clone \
-			"${spcd_ipm__url}" \
-			"${spcd_ipm__root}/${spcd_ipm__name}" ||
-			exit
-		spcd_ipm__path="${spcd_ipm__root}/${spcd_ipm__name}/${spcd_ipm__name}"
-		echo "\
-${spcd_ipm__path}
-↓
-${SPCD_PYTHON_PACKAGES}"
-		cp --recursive "${spcd_ipm__path}" "${SPCD_PYTHON_PACKAGES}" ||
-			exit
-	done
-	spcd_split
-	spcd_ls "${SPCD_PYTHON_PACKAGES}"
-	spcd_split
-	spcd_rm "${spcd_ipm__root}"
-}
-
-spcd_write_python_module() {
-	spcd_step "Write Python module"
-	for spcd_wpm__variable in \
-		OS_ID OS_VERSION \
-		PROJECT_ROOT PROJECT_PATH PROJECT_NAME \
-		OPEN DOWN VERT SPLT __UP SHUT; do
-		spcd_wpm__value="$(spcd_echo "SPCD_${spcd_wpm__variable}")"
-		spcd_wpm__text="${spcd_wpm__text}${spcd_wpm__value}
-"
-	done
-	spcd_write "${SPCD_PYTHON_PACKAGES}/env.py" "${spcd_wpm__text}
-SPCD_STEP = $((SPCD_STEP + 1))
-"
-}
-
-spcd_switch_to_python() {
-	spcd_step "Switch to Python"
-	spcd_stp__name="$(basename "${SPCD_GIT_MAIN}")"
-	echo "\
-${SPCD_PATH}
-↓
-${SPCD_PYTHON_PACKAGES}/${spcd_stp__name}"
-	"${SPCD_PYTHON_ALIAS}" -m "${spcd_stp__name}" "${@}"
-}
-
-# functions
-
-spcd_cat() {
-	spcd_cat__file="${1}"
-	if [ -n "${spcd_cat__file}" ]; then
-		spcd_open "${spcd_cat__file}"
-		cat "${spcd_cat__file}" || exit
-		spcd_shut "${spcd_cat__file}"
-	fi
-}
-
-spcd_echo() {
-	if [ -n "${1}" ]; then
-		for spcd_echo__name in "${@}"; do
-			spcd_echo__text=""
-			eval "spcd_echo__text=\"\${${spcd_echo__name}}\""
-			echo "${spcd_echo__name} = \"${spcd_echo__text}\""
-		done
-	fi
-}
-
-spcd_error_ci() {
-	echo "× CI: ${*}"
-	exit "${SPCD_ERROR_CI}"
-}
-
-spcd_error_os() {
-	spcd_error_os__variable="${1}"
-	printf "× OS: "
-	spcd_echo "${spcd_error_os__variable}"
-	exit "${SPCD_ERROR_OS}"
-}
-
-spcd_grep_os() {
-	spcd_grep_os__variable="${1}"
-	[ -n "${spcd_grep_os__variable}" ] &&
-		grep "^${spcd_grep_os__variable}=" "/etc/os-release" |
-		sed "s|^${spcd_grep_os__variable}=||" |
-			sed "s|^\"\(.*\)\"$|\1|"
-}
-
-spcd_install_package() {
-	spcd_install_package__name="${1}"
-	if [ -n "${spcd_install_package__name}" ]; then
-		${SPCD_PM_INSTALL} "${spcd_install_package__name}" || exit
-	fi
-}
-
-spcd_ln_python() {
-	spcd_ln_python__command="${1}"
-	if [ -n "${spcd_ln_python__command}" ]; then
-		echo "→ ${SPCD_PYTHON_ALIAS} → ${spcd_ln_python__command}"
-		ln -f -s "${spcd_ln_python__command}" \
-			"/usr/bin/${SPCD_PYTHON_ALIAS}" || exit
-	fi
-}
-
-spcd_ls() {
-	spcd_ls__path="${1}"
-	if [ -n "${spcd_ls__path}" ]; then
-		spcd_open "${spcd_ls__path}"
-		ls -a -l "${spcd_ls__path}" || exit
-		spcd_shut "${spcd_ls__path}"
-	fi
-}
-
-spcd_mkdir() {
-	spcd_mkdir__path="${1}"
-	if [ -n "${spcd_mkdir__path}" ]; then
-		echo "→ ${spcd_mkdir__path}"
-		mkdir --parents "${spcd_mkdir__path}" || exit
-	fi
-}
-
-spcd_open() {
-	echo "${SPCD_OPEN}${*}"
-}
-
-spcd_openssl() {
-	spcd_openssl__file="${1}"
-	if [ -f "${spcd_openssl__file}" ]; then
-		openssl x509 \
-			-in "${spcd_openssl__file}" \
-			-noout -text ||
-			exit
-	fi
-}
-
-spcd_rm() {
-	spcd_rm__path="${1}"
-	if [ -e "${spcd_rm__path}" ]; then
-		echo "← ${spcd_rm__path}"
-		rm -r "${spcd_rm__path}" || exit
-	fi
-}
-
-spcd_sed() {
-	spcd_sed__file="${1}"
-	shift
-	if [ -f "${spcd_sed__file}" ]; then
-		spcd_cat "${spcd_sed__file}"
-		for spcd_sed__regex in "${@}"; do
-			sed --in-place "s${spcd_sed__regex}g" "${spcd_sed__file}" &&
-				spcd_cat "${spcd_sed__file}" || exit
-		done
-	fi
-}
-
-spcd_shut() {
-	echo "${SPCD_SHUT}${*}"
-}
-
-spcd_split() {
-	echo "${SPCD_SPLT}"
-}
-
-spcd_step() {
-	SPCD_STEP=$((SPCD_STEP + 1))
-	echo "\
-${SPCD_DOWN}
-${SPCD_VERT} ${SPCD_STEP} ${*}
-${SPCD___UP}"
-}
-
-spcd_write() {
-	spcd_write__file="${1}"
-	spcd_write__text="${2}"
-	if [ -n "${spcd_write__file}" ]; then
-		[ -f "${spcd_write__file}" ] && spcd_cat "${spcd_write__file}"
-		echo "→ ${spcd_write__file}"
-		printf "%s" "${spcd_write__text}" >"${spcd_write__file}" || exit
-		spcd_cat "${spcd_write__file}"
-	fi
-}
-
-# constants
-
-SPCD_BOX_DOWN="╭"
-SPCD_BOX_LEFT="╴"
-SPCD_BOX_RIGHT="╶"
-SPCD_BOX_UP="╰"
-SPCD_BOX_VERTICAL="│"
-
-SPCD_ERROR_CI=2
-SPCD_ERROR_OS=1
-
-SPCD_OS_ALMA="alma"
-SPCD_OS_ALPINE="alpine"
-SPCD_OS_ARCH="arch"
-SPCD_OS_DEBIAN="debian"
-SPCD_OS_FEDORA="fedora"
-SPCD_OS_ROCKY="rocky"
-SPCD_OS_UBUNTU="ubuntu"
-
-SPCD_PM_APK="apk"
-SPCD_PM_APT="apt"
-SPCD_PM_DNF="dnf"
-SPCD_PM_PACMAN="pacman"
-
-SPCD_HORIZONTAL="────╌╌╌╌┄┄┄┄┈┈┈┈"
-
-SPCD_OPEN="${SPCD_BOX_DOWN}${SPCD_BOX_LEFT}"
-SPCD_DOWN="${SPCD_BOX_DOWN}${SPCD_HORIZONTAL}"
-SPCD_VERT="${SPCD_BOX_VERTICAL}"
-SPCD_SPLT="${SPCD_BOX_RIGHT}${SPCD_HORIZONTAL}"
-SPCD___UP="${SPCD_BOX_UP}${SPCD_HORIZONTAL}"
-SPCD_SHUT="${SPCD_BOX_UP}${SPCD_BOX_LEFT}"
-
-# run
-spcd_main "${@}"