this should improve so many things

 - set permissions correctly on directories (correctness)
 - get the cached file for the correct architecture (correctness)
 - only open each cached package file only once (speed)
 - only run pacman twice (instead of n+1 times).
 - don't ask pacman to make a list of all known files (speed)
   * this may be partially negated by running `pacman -Qi`

1 files changed, 12 insertions, 10 deletions

diff --git a/pristine-etc-keeper b/pristine-etc-keeper
index 2a1d51f..9fee0f3 100755
--- a/pristine-etc-keeper
+++ b/pristine-etc-keeper
@@ -5,6 +5,14 @@
 
 # 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"
 
@@ -18,16 +26,10 @@ commit() (
 
 	rm -rf etc/
 
-	pacman -Q | while read -r pkgname pkgver; do
-		file=("/var/cache/pacman/pkg/$pkgname-$pkgver"-*.pkg.tar.*)
-		pacman -Qlq "$pkgname"|grep ^/etc/|sed "s|^/|$file |"
-	done | while read -r tarfile etcfile; do
-		if [[ "$etcfile" = */ ]]; then
-			mkdir -p "$etcfile"
-		else
-			bsdtar xpfv "$tarfile" "$etcfile"
-		fi
-	done
+	while IFS=' ' read -r pkgname pkgver arch; do
+		file=("/var/cache/pacman/pkg/$pkgname-$pkgver-$arch".pkg.tar.*)
+		bsdtar xpfv "$file" etc
+	done <(join <(pacman-etc-name-ver|sort) <(pacman-all-name-arch|sort))
 
 	touch etc/.gitignore
 	ln -sr etc.git etc/.git