57 lines
1.4 KiB
Bash
Executable File
57 lines
1.4 KiB
Bash
Executable File
#!/bin/sh
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export PATH="/usr/bin:/bin"
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error() {
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: ${ERR:=1}
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echo "$@" >&2
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return "$ERR"
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}
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alt_ab() {
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if [ "$1" == "a" ]; then echo "b"; else echo "a"; fi
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}
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: ${S6_PATH:='/etc/s6'}
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: ${S6_RC_PATH:="$S6_PATH/rc"}
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: ${S6_SV_PATH:="$S6_PATH/sv"}
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# A/B mode, always keep last copy
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DB_FRESH_ACT=""
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DB_FRESH_NAC=""
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cstate() {
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DB_FRESH_ACT="$(readlink "$S6_SV_PATH/current" | cut -d. -f2)" # if it fails (missing), it will be empty and 'a' will be used as inactive by default
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DB_FRESH_NAC="$(alt_ab "$DB_FRESH_ACT")"
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}
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generate() {
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mkdir -p "$S6_SV_PATH" || ERR="$?" error "Failed to create sv directory"
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# A/B current
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if [ -d "$S6_SV_PATH/current.$DB_FRESH_NAC" ]; then
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rm -rf "$S6_SV_PATH/current.$DB_FRESH_NAC" || ERR="$?" error "Failed to remove inactive database path"
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fi
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s6-rc-compile "$S6_SV_PATH/current.$DB_FRESH_NAC" "$S6_RC_PATH"/* || ERR="$?" error "Failed to compile current s6 database"
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}
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update() {
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s6-rc-update "$S6_SV_PATH/current.$DB_FRESH_ACT" || ERR="$?" error "Failed to update live state of the database"
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}
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swap() {
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if [ -d "$S6_SV_PATH/current.$DB_FRESH_NAC" ]; then
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ln -sfn "current.$DB_FRESH_NAC" "$S6_SV_PATH/current" || ERR="$?" error "Failed to update A/B current symlink"
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else
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error "There's no database to switch to"
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fi
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}
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for act in $@; do
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cstate
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case "$act" in
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generate|update|swap) eval "$act";;
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*) error "Invalid action $act";;
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esac
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done
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