lxc/get-lxc-idmap-config

@@ -56,7 +56,7 @@ usage () {
 
 
 TYPE="${1}"
-if [ "${TYPE}" = "" ] || [ "${TYPE}" = "--help" ] || [ "${TYPE}" = "-h" ]; then
+if [ "${TYPE}" = "" || "${TYPE}" == "--help" || "${TYPE}" == "-h" ]; then
 	usage
 fi
 

lxc/remap-uid-and-gid-for-lv

@@ -1,8 +1,9 @@
 #!/bin/sh
-# Remap all files uid/gid to a new range using fuidshift
-#
-# This is a wrapper around `fuidshift` from `lxd-tools` Debian package for my use-case of LVM based root disks.
+# Remap all files uid/gid to a new range
 #
+# This is an inferior version of `fuidshift` from the `lxd-tools` Debian package, as it only handles uid/gid and
+# doesn't handle ACLs and thus journalctl's files and by that hinders updating systemd inside the container. It's also
+# quite slow.
 
 usage () {
 	echo "remap-uid-and-gid <container-name> [<target-lv>]"
@@ -10,13 +11,8 @@ usage () {
 	exit 1
 }
 
-if [ "$(which fuidshift)" = "" ]; then
-	echo "fuidshift binary not found. Please install lxd-tools package."
-	exit 1
-fi
-
 CONTAINER_NAME="${1}"
-if [ "${CONTAINER_NAME}" = "" ] || [ "${CONTAINER_NAME}" = "--help" ] || [ "${CONTAINER_NAME}" = "-h" ]; then
+if [ "${CONTAINER_NAME}" = "" ]; then
 	usage
 fi
 
@@ -37,13 +33,39 @@ if mount | grep -qF " on /mnt"; then
 fi
 
 mount "${TARGET_LV}" /mnt
+cd /mnt
 
-# we get e.g. lxc.idmap = u 0 1000000 65535 and want u:0:1000000:65535
-USER_NAMESPACE=$(get-lxc-idmap-config u $CONTAINER_NAME | sed -r -e 's/.*= (.*)/\1/' -e 's/ /:/g')
-GROUP_NAMESPACE=$(get-lxc-idmap-config g $CONTAINER_NAME | sed -r -e 's/.*= (.*)/\1/' -e 's/ /:/g')
+ROOT_USER_ID=$(get-lxc-idmap-config u $CONTAINER_NAME | cut -d ' ' -f 5)
+ROOT_GROUP_ID=$(get-lxc-idmap-config g $CONTAINER_NAME | cut -d ' ' -f 5)
 
-printf "fuidshift %s %s %s\n" /mnt $USER_NAMESPACE $GROUP_NAMESPACE
-# fuidshift /mnt $USER_NAMESPACE $GROUP_NAMESPACE
+printf "uid: %s gid: %s\n" $ROOT_USER_ID $ROOT_GROUP_ID
+
+# We ignore links here, because they might not point to a valid location and would make our program fail. They are also
+# owned by whoever mounted the filesystem it seems, so don't need a chown.
+find . -xdev -not -type l -printf "%U %G %p\n" | \
+	while read F; do
+		U=$(echo $F | cut -d ' ' -f 1)
+		if [ ${U} -lt ${ROOT_USER_ID} ] || [ ${U} -gt $(( ${ROOT_USER_ID} + 65535 )) ]; then
+			NEW_U=$(( ${U} + ${ROOT_USER_ID} ))
+		else
+			NEW_U=${U}
+		fi
+
+		G=$(echo $F | cut -d ' ' -f 2)
+		if [ ${G} -lt ${ROOT_GROUP_ID} ] || [ ${G} -gt $(( ${ROOT_GROUP_ID} + 65535 )) ]; then
+			NEW_G=$(( ${G} + ${ROOT_GROUP_ID} ))
+		else
+			NEW_G=${G}
+		fi
+
+		if [ "${U}" = "${NEW_U}" ] && [ "${G}" = "${NEW_G}" ]; then
+			continue
+		fi
+
+		P=$(echo $F | cut -d ' ' -f 3-)
+		printf "chown %s:%s %s\n" ${NEW_U} ${NEW_G} "${P}"
+		# chown ${NEW_U}:${NEW_G} "${P}"
+	done
 
 cd /
 umount /mnt