setup-apkcache: new setup tool

A tool to setup the apk cache. This and setup-lbu replaces the
setup-apklbu tool.

1 files changed, 117 insertions, 0 deletions

diff --git a/setup-apkcache.in b/setup-apkcache.in
new file mode 100644
index 0000000..89147a3
--- /dev/null
+++ b/setup-apkcache.in
@@ -0,0 +1,117 @@
+#!/bin/sh
+
+PREFIX=
+
+. "$PREFIX/lib/libalpine.sh"
+
+usage() {
+        cat <<__EOF__
+usage: setup-apkcache [-h] [DIR]
+
+Setup apk caching.
+
+If DIR is not specified user will be asked for location.
+
+options:
+ -h  Show this help 
+__EOF__
+        exit 1
+}
+
+is_mounted() {
+	awk '{print $2}' /proc/mounts | grep -q "^$1$"
+}
+
+# figure out mount point
+find_mount_point() {
+	local dir="$1"
+	while ! [ -d "$dir" ]; do
+		dir=${dir%/*}
+	done
+	local fs_id=$(stat -f -c %i "$dir")
+	local parent="${dir%/*}"
+	while [ -n "$parent" ] && [ "$(stat -f -c %i $parent)" = "$fs_id" ]; do
+		dir=$parent
+		parent=${parent%/*}
+	done
+	[ -z "$dir" ] && dir=/
+	echo $dir
+}
+
+get_mount_opts() {
+	local mnt="$1"
+	awk "\$2 == \"$mnt\" {gsub(/,/, \" \", \$4); print \$4}" /proc/mounts
+}
+
+is_mounted_ro() {
+	local mnt="$1"
+	local opts=$(get_mount_opts $mnt)
+	local opt=
+	for opt in $opts; do
+		if [ "$opt" = "ro" ]; then
+			return 0
+		fi
+	done
+	return 1
+}
+
+while getopts "h" opt; do
+        case $opt in
+		h) usage;;
+        esac
+done
+shift $(( $OPTIND - 1 ))
+
+# try auto detetect what we suggest
+suggestion=
+if [ -L /etc/apk/cache ]; then
+	suggestion=$(readlink $suggestion)
+
+if [ -z "$suggestion" ] && [ -f /etc/lbu/lbu.conf ]; then
+	. /etc/lbu/lbu.conf
+	if [ -n "$LBU_MEDIA" ]; then
+		suggestion=/media/$LBU_MEDIA/cache
+	fi
+fi
+
+if [ -z "$suggestion" ] && [ -L /dev/usbdisk ]; then
+	suggestion=/media/usb/cache
+fi
+
+if [ -z "$suggestion" ]; then
+	suggestion=none
+fi
+cachedir=$1
+
+while [ -z "$cachedir" ]; do
+	echo -n "Where would you like to store apk cache? (or none) [$suggestion] "
+	default_read cachedir $suggestion
+done
+
+if [ "$cachedir" = "none" ]; then
+	exit 0
+fi
+
+mount=$(find_mount_point $cachedir)
+
+cleanup=
+
+if ! is_mounted $mount; then
+	mount $mount || exit 1
+	cleanup="umount"
+elif is_mounted_ro $mount; then
+	mount -o remount,rw $mount || exit 1
+	cleanup="remount"
+fi
+
+mkdir -p $cachedir
+if [ -L /etc/apk/cache ]; then
+	rm -f /etc/apk/cache
+fi
+ln -s $cachedir /etc/apk/cache
+
+case "$cleanup" in
+	umount) umount $mount;;
+	remount) mount -o remount,ro $mount;;
+esac
+