main/postmarketos-mvcfg: new package (MR 1713)

Add scripts to move configs from legacy packaging, as described at:
https://postmarketos.org/mvcfg

.gitlab-ci/shellcheck.sh

@@ -36,6 +36,7 @@ sh_files="
 
 	$(find . -name '*.trigger')
 	$(find . -path './main/devicepkg-dev/*.sh')
+	$(find . -path './main/postmarketos-mvcfg/*.sh')
 
 	$(find . -path '.gitlab-ci/*.sh')
 "

main/postmarketos-mvcfg/APKBUILD

@@ -0,0 +1,22 @@
+# Maintainer: Oliver Smith <ollieparanoid@postmarketos.org>
+pkgname=postmarketos-mvcfg
+pkgver=1
+pkgrel=0
+pkgdesc="Move configs from legacy packaging"
+url="https://postmarketos.org/mvcfg"
+arch="noarch"
+license="GPL-3.0-or-later"
+options="!check !tracedeps pmb:cross-native"
+source="
+	postmarketos-mvcfg-pre-upgrade.sh
+	postmarketos-mvcfg-package.sh
+	"
+
+package() {
+	for script in pre-upgrade package; do
+		install -Dm755 "postmarketos-mvcfg-$script.sh" \
+			"$pkgdir/usr/bin/postmarketos-mvcfg-$script"
+	done
+}
+sha512sums="58affac657b588a8a1f3370aa649cbc4077206cc237a6180b9533e85108394eedbb10e4b71bb8aecafdbdfc0de820b116b8baa9a6c3fe44272da06a9a5d11d52  postmarketos-mvcfg-pre-upgrade.sh
+82ae4ccc8de87acf1c40e8c6bfb9bd1d0e7eff11055e231000304000dec87de04dc988125aad8a60a8266a21b90da2e14c9605d29b0748ad3cbf5a92dd00910a  postmarketos-mvcfg-package.sh"

main/postmarketos-mvcfg/postmarketos-mvcfg-package.sh

@@ -0,0 +1,17 @@
+#!/bin/sh -e
+
+pkgdir="$1"
+dirname="$2"
+
+if [ -z "$dirname" ] || ! [ -d "$pkgdir" ]; then
+	echo "usage:"
+	# shellcheck disable=SC2016
+	echo '  postmarketos-mvcfg-package "$pkgname" "$pkgdir"'
+	echo "more information:"
+	echo "  https://postmarketos.org/mvcfg"
+	exit 1
+fi
+
+# Create "done" file, so postmarketos-mvcfg-pre-upgrade doesn't do anything
+mkdir -p "$pkgdir/etc/postmarketos-mvcfg/done"
+touch "$pkgdir/etc/postmarketos-mvcfg/done/$dirname"

main/postmarketos-mvcfg/postmarketos-mvcfg-pre-upgrade.sh

@@ -0,0 +1,83 @@
+#!/bin/sh
+# Move all configs that were created/modified with legacy methods in
+# post-install scripts.
+
+if [ "$#" -lt 2 ]; then
+	echo "usage:"
+	echo "  postmarketos-mvcfg-pre-upgrade dirname cfg [cfg ...]"
+	echo "example:"
+	echo "  postmarketos-mvcfg-pre-upgrade \\"
+	echo "    postmarketos-base \\"
+	echo "    /etc/issue \\"
+	echo "    /etc/fstab"
+	echo "more information:"
+	echo "  https://postmarketos.org/mvcfg"
+	exit 1
+fi
+
+# Skip if "done" file exists. This is created in package() with
+# postmarketos-mvcfg-package, so this script doesn't do anything if the package
+# installed at pre-upgrade time is already using properly packaged configs.
+dirname="$1"
+if [ -e "/etc/postmarketos-mvcfg/done/$dirname" ]; then
+	exit 0
+fi
+
+# Only act on existing files
+shift
+cfgs_found=""
+for i in "$@"; do
+	if [ -e "$i" ]; then
+		cfgs_found="$cfgs_found $i"
+	fi
+done
+
+if [ -n "$cfgs_found" ]; then
+	# Create non-existing backupdir
+	backupdir="/etc/postmarketos-mvcfg/backup/$dirname"
+	while [ -d "$backupdir" ]; do
+		backupdir="${backupdir}_"
+	done
+	mkdir -p "$backupdir"
+
+	# Copy all configs first
+	for i in $cfgs_found; do
+		# Generate non-existing target path
+		# flatpath: /etc/issue -> etc-issue
+		flatpath="$(echo "$i" | sed s./.-.g | cut -d- -f2-)"
+		target="$backupdir/$flatpath"
+		while [ -e "$target" ]; do
+			target="${target}_"
+		done
+
+		cp -a "$i" "$target"
+	done
+
+	# Remove configs
+	for i in $cfgs_found; do
+		rm "$i"
+	done
+
+	# List moved configs
+	echo "  *"
+	echo "  * These configs were created with legacy packaging methods:"
+	for i in $cfgs_found; do
+		echo "  *   $i"
+	done
+	echo "  *"
+	echo "  * In order to replace them with properly packaged configs,"
+	echo "  * the old versions (which you might have adjusted manually)"
+	echo "  * were moved to:"
+	echo "  *   $backupdir"
+	echo "  *"
+	echo "  * If you did not manually adjust these configs, you can ignore"
+	echo "  * this message."
+	echo "  *"
+	echo "  * More information: https://postmarketos.org/mvcfg"
+	echo "  *"
+fi
+
+# Make sure that the "done" file exists, even if the packager forgot to call
+# 'postmarketos-mvcfg-package' in package() of the APKBUILD.
+mkdir -p "/etc/postmarketos-mvcfg/done"
+touch "/etc/postmarketos-mvcfg/done/$dirname"