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#!/usr/bin/env bash
# Copyright 2016 Luke Shumaker
#
# This script gets called by the etckeeper post-install hook.
# TODO: better error handling
pacman-etc-name-ver() {
LC_ALL=C pacman -Qo /etc | sed 's|^/etc/ is owned by ||'
}
pacman-all-name-arch() {
LC_ALL=C pacman -Qi | tr $'\n' $'\r' | sed 's/\r\r/\n/g' | sed -r 's|(.*\r)?Name\s*:\s*(\S+)(\r.*)?\rArchitecture\s*:\s*(\S+)\r.*|\2 \4|'
}
commit() (
local msg="$1"
cd /var/lib/pristine-etc
if ! [[ -d etc.git ]]; then
mkdir -p etc
(cd etc && etckeeper init -d "$PWD")
mv etc/.git etc.git
ln -sr etc.git etc/.git
fi
rm -rf etc/
local err=false
local files=()
while IFS=' ' read -r pkgname pkgver arch; do
local file=("/var/cache/pacman/pkg/$pkgname-$pkgver-$arch".pkg.tar.*)
if ! test -f "$file"; then
printf "ERROR: no cached package for %s %s %s\n" "$pkgname" "$pkgver" "$arch"
err=true
fi
files+=("$file")
done < <(join <(pacman-etc-name-ver|sort) <(pacman-all-name-arch|sort))
if $err; then
return 1
fi
local file
for file in "${files[@]}"; do
printf " -> %s\n" "$file"
bsdtar xpvf "$file" etc
done
touch etc/.gitignore
ln -sr etc.git etc/.git
cd etc/
if etckeeper unclean -d "$PWD"; then
etckeeper commit -d "$PWD" "$msg"
fi
)
pull() (
cd /etc
git remote add pristine /var/lib/pristine-etc/etc &>/dev/null || true
git fetch pristine
)
lock() {
exec 8>/var/lib/pristine-etc/lock
flock -x -n 8
}
unlock() {
exec 8>&-
}
main() {
set -e
umask 0022
if [[ $# -gt 0 ]]; then
lock
printf '%s\n' "$*" >> /var/lib/pristine-etc/spool
unlock
fi
while true; do
lock
if ! [[ -f /var/lib/pristine-etc/spool ]]; then
return 0
fi
msg="$(cat /var/lib/pristine-etc/spool)"
rm -f /var/lib/pristine-etc/spool
unlock
commit "$msg" || return $?
pull || return $?
done
}
main "$@"
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