diff --git a/cd.sh b/cd.sh
index 7a49275..06ab309 100644
--- a/cd.sh
+++ b/cd.sh
@@ -38,52 +38,34 @@ cd_set_environment () {
                 "bookworm")
                     echo "TODO"
                 ;;
-                *)
-                    echo "CD_OS_VERSION"
-                    exit 2
-                ;;
+                *) cd_error_os "CD_OS_VERSION=" ;;
             esac
         ;;
-        *)
-            echo "CD_OS_NAME"
-            exit 1
-        ;;
+        *) cd_error_os "CD_OS_NAME=" ;;
     esac
-    # project / branch
-    [ "${CI_COMMIT_BRANCH}" ] && CD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
-    [ "${GITHUB_REF_NAME}" ] && CD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
-    if [ ! "${CD_PROJECT_BRANCH}" ] ; then
-        echo "CD_PROJECT_BRANCH"
-        exit 3
-    fi
-    # project / name
-    [ "${CI_PROJECT_PATH}" ] \
-    && CD_PROJECT_NAME="$(basename "${CI_PROJECT_PATH}")"
-    [ "${GITHUB_REPOSITORY}" ] \
-    && CD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
-    if [ ! "${CD_PROJECT_NAME}" ] ; then
-        echo "CD_PROJECT_NAME"
-        exit 3
-    fi
-    # projects / group
-    [ "${CI_PROJECT_PATH}" ] \
-    && CD_PROJECTS_GROUP="$(dirname "${CI_PROJECT_PATH}")"
-    [ "${GITHUB_REPOSITORY}" ] \
-    && CD_PROJECTS_GROUP="$(dirname "${GITHUB_REPOSITORY}")"
-    if [ ! "${CD_PROJECTS_GROUP}" ] ; then
-        echo "CD_PROJECTS_GROUP"
-        exit 3
-    fi
-    # projects / url
-    [ "${CI_SERVER_URL}" ] && CD_PROJECTS_URL="${CI_SERVER_URL}"
-    [ "${GITHUB_SERVER_URL}" ] && CD_PROJECTS_URL="${GITHUB_SERVER_URL}"
-    if [ "${CD_PROJECTS_URL}" ] ; then
-        CD_PROJECTS_URL="${CD_PROJECTS_URL}/${CD_PROJECTS_GROUP}"
+    # ci / github
+    if [ "${GITHUB_ACTIONS}" ] ; then
+        CD_SERVER_URL="${GITHUB_SERVER_URL}"
+        CD_PROJECT_BRANCH="${GITHUB_REF_NAME}"
+        CD_PROJECT_NAME="$(basename "${GITHUB_REPOSITORY}")"
+        CD_PROJECTS_GROUP="$(dirname "${GITHUB_REPOSITORY}")"
+    # ci / gitlab
+    elif [ "${GITLAB_CI}" ] ; then
+        CD_SERVER_URL="${CI_SERVER_URL}"
+        CD_PROJECT_BRANCH="${CI_COMMIT_BRANCH}"
+        CD_PROJECT_NAME="$(basename "${CI_PROJECT_PATH}")"
+        CD_PROJECTS_GROUP="$(dirname "${CI_PROJECT_PATH}")"
+    # ci / none
     else
-        echo "CD_PROJECTS_URL"
-        exit 3
+        cd_error_ci "ø"
     fi
-    # project / url
+    #
+    [ "${CD_SERVER_URL}" ] || cd_error_ci "CD_SERVER_URL"
+    [ "${CD_PROJECT_BRANCH}" ] || cd_error_ci "CD_PROJECT_BRANCH"
+    [ "${CD_PROJECT_NAME}" ] || cd_error_ci "CD_PROJECT_NAME"
+    [ "${CD_PROJECTS_GROUP}" ] || cd_error_ci "CD_PROJECTS_GROUP"
+    #
+    CD_PROJECTS_URL="${CD_SERVER_URL}/${CD_PROJECTS_GROUP}"
     CD_PROJECT_URL="${CD_PROJECTS_URL}/${CD_PROJECT_NAME}"
     #
     echo -n "\
@@ -95,11 +77,13 @@ CD_DNS_FILE=${CD_DNS_FILE}
 CD_PYTHON_COMMAND=${CD_PYTHON_COMMAND}
 CD_PYTHON_PACKAGES=${CD_PYTHON_PACKAGES}
 #
+CD_SERVER_URL=${CD_SERVER_URL}
 CD_PROJECT_BRANCH=${CD_PROJECT_BRANCH}
 CD_PROJECT_NAME=${CD_PROJECT_NAME}
-CD_PROJECT_URL=${CD_PROJECT_URL}
 CD_PROJECTS_GROUP=${CD_PROJECTS_GROUP}
+#
 CD_PROJECTS_URL=${CD_PROJECTS_URL}
+CD_PROJECT_URL=${CD_PROJECT_URL}
 "
 }
 
@@ -127,7 +111,7 @@ deb https://deb.debian.org/debian-security bookworm-security main
 "
             cd_cat "/etc/apt/sources.list"
         ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_set_packages_repositories" ;;
     esac
 }
 
@@ -145,7 +129,7 @@ Dir::Etc::SourceParts \"\";
 "
             cd_cat "/etc/apt/apt.conf.d/apt.conf"
         ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_set_packages_configuration" ;;
     esac
 }
 
@@ -158,7 +142,7 @@ Acquire::https::Verify-Peer False;
 "
             cd_cat "/etc/apt/apt.conf.d/https"
         ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_set_https_verification_off" ;;
     esac
 }
 
@@ -166,7 +150,7 @@ cd_update_packages_catalog () {
     cd_step "Update packages catalog"
     case "${CD_OS_NAME}" in
         "debian") apt-get update || exit ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_update_packages_catalog" ;;
     esac
 }
 
@@ -174,7 +158,7 @@ cd_install_packages_tools () {
     cd_step "Install packages tools"
     case "${CD_OS_NAME}" in
         "debian") cd_install_package "apt-utils" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_install_packages_tools" ;;
     esac
 }
 
@@ -182,7 +166,7 @@ cd_install_ca () {
     cd_step "Install CA"
     case "${CD_OS_NAME}" in
         "debian") cd_install_package "ca-certificates" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_install_ca" ;;
     esac
 }
 
@@ -191,7 +175,7 @@ local target
     cd_step "Copy CA"
     case "${CD_OS_NAME}" in
         "debian") target="/usr/local/share/ca-certificates" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_copy_ca" ;;
     esac
     # TODO copy
 }
@@ -200,7 +184,7 @@ cd_update_ca () {
     cd_step "Update CA"
     case "${CD_OS_NAME}" in
         "debian") update-ca-certificates || exit ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_update_ca" ;;
     esac
 }
 
@@ -208,7 +192,7 @@ cd_set_https_verification_on () {
     cd_step "Set HTTPS verification on"
     case "${CD_OS_NAME}" in
         "debian") cd_rm "/etc/apt/apt.conf.d/https" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_set_https_verification_on" ;;
     esac
 }
 
@@ -216,7 +200,7 @@ cd_upgrade_packages () {
     cd_step "Upgrade packages"
     case "${CD_OS_NAME}" in
         "debian") apt-get upgrade --yes || exit ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_upgrade_packages" ;;
     esac
 }
 
@@ -224,7 +208,7 @@ cd_install_git () {
     cd_step "Install Git"
     case "${CD_OS_NAME}" in
         "debian") cd_install_package "git" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_install_git" ;;
     esac
 }
 
@@ -232,7 +216,7 @@ cd_install_python () {
     cd_step "Install Python"
     case "${CD_OS_NAME}" in
         "debian") cd_install_package "python3" ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_install_python" ;;
     esac
 }
 
@@ -240,7 +224,7 @@ cd_clean_packages_cache () {
     cd_step "Clean packages cache"
     case "${CD_OS_NAME}" in
         "debian") apt-get clean || exit ;;
-        *) exit 1 ;;
+        *) cd_error_os "cd_clean_packages_cache" ;;
     esac
 }
 
@@ -295,6 +279,15 @@ cd_cat () {
     fi
 }
 
+cd_error_ci () {
+    echo "× CI: ${1}"
+    exit 1
+}
+cd_error_os () {
+    echo "× OS: ${1}"
+    exit 2
+}
+
 cd_install_package () {
     if [ "${1}" ] ; then
         case "${CD_OS_NAME}" in