clear known_hosts

cd-bootstrap.sh

@@ -1,20 +1,28 @@
+KEY_ALGORITHM='ed25519'
+KEY_PATH=".ssh/id_ed25519"
+KEY_PUBLIC='AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5'
+PACKAGES=(
+'python3'
+'rsync'
+'tree'
+)
+SERVER="$(basename ${GITHUB_SERVER_URL})"
+
 # ssh
 
-mkdir --parents ~/.ssh
+mkdir '.ssh' \
+|| exit
 
-echo "${CD}" > ~/.ssh/id_ed25519
+echo "${CD}" > "${KEY_PATH}" \
+|| exit
 unset CD
-chmod 400 ~/.ssh/id_ed25519
+chmod '400' "${KEY_PATH}" \
+|| exit
 
-echo -n "\
-|1|BcccCTMLpM9HHSgJmPu/FFOwOv0=|+3BKK02xibpCPxQ9Nghi2GbXLng= \
-ssh-ed25519 \
-AAAAC3NzaC1lZDI1NTE5AAAAIPHCNcgHlQoiNTXfnUZYvHz9OZwYsmBCrSSV7a7Zche5
-" > ~/.ssh/known_hosts
+echo "${SERVER} ssh-${KEY_ALGORITHM} ${KEY_PUBLIC}" \
+> '.ssh/known_hosts' \
+|| exit
 
 # packages
 
-apt-get install --yes \
-'python3' \
-'rsync' \
-'tree' \
+apt-get install --yes "${PACKAGES[@]}"