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84 lines
2.6 KiB
84 lines
2.6 KiB
#!/bin/sh
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# Remap all files uid/gid to a new range
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#
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# This is an inferior version of `fuidshift` from the `lxd-tools` Debian package, as it only handles uid/gid and
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# doesn't handle ACLs and thus journalctl's files and by that hinders updating systemd inside the container. It's also
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# quite slow.
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usage () {
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echo "remap-uid-and-gid <container-name> [<target-lv>]"
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printf "\nIf <target-lv> is not given it is computed from a default value with the given container name\n"
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exit 1
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}
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CONTAINER_NAME="${1}"
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if [ "${CONTAINER_NAME}" = "" ]; then
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usage
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fi
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TARGET_LV="${2}"
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if [ "${TARGET_LV}" = "" ]; then
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GUESSED_LV="/dev/mapper/daffy--vg-lxc--${CONTAINER_NAME}"
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if [ -e "${GUESSED_LV}" ]; then
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TARGET_LV="${GUESSED_LV}"
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fi
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fi
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if [ "${TARGET_LV}" = "" ]; then
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usage
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fi
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if mount | grep -qF " on /mnt"; then
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echo "Mountpoint /mnt is already in use."
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exit 1
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fi
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mount "${TARGET_LV}" /mnt
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cd /mnt
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ROOT_USER_ID=$(get-lxc-idmap-config u $CONTAINER_NAME | cut -d ' ' -f 5)
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ROOT_GROUP_ID=$(get-lxc-idmap-config g $CONTAINER_NAME | cut -d ' ' -f 5)
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printf "uid: %s gid: %s\n" $ROOT_USER_ID $ROOT_GROUP_ID
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# We ignore links here, because they might not point to a valid location and would make our program fail. They are also
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# owned by whoever mounted the filesystem it seems, so don't need a chown.
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# Funny enough, the above statement is not true. I see symlinks in the container that are not owned by a valid user
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# inside the container ...
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# chown
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# -h, --no-dereference
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# affect symbolic links instead of any referenced file (useful only on systems
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# that can change the ownership of a symlink)
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#
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# --from=CURRENT_OWNER:CURRENT_GROUP
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# change the owner and/or group of each file only if its current owner and/or
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# group match those specified here. Either may be omitted, in which case a
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# match is not required for the omitted attribute
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#
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find . -xdev -printf "%U %G %p\n" | \
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while read F; do
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U=$(echo $F | cut -d ' ' -f 1)
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if [ ${U} -lt ${ROOT_USER_ID} ] || [ ${U} -gt $(( ${ROOT_USER_ID} + 65535 )) ]; then
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NEW_U=$(( ${U} + ${ROOT_USER_ID} ))
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else
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NEW_U=${U}
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fi
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G=$(echo $F | cut -d ' ' -f 2)
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if [ ${G} -lt ${ROOT_GROUP_ID} ] || [ ${G} -gt $(( ${ROOT_GROUP_ID} + 65535 )) ]; then
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NEW_G=$(( ${G} + ${ROOT_GROUP_ID} ))
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else
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NEW_G=${G}
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fi
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if [ "${U}" = "${NEW_U}" ] && [ "${G}" = "${NEW_G}" ]; then
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continue
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fi
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P=$(echo $F | cut -d ' ' -f 3-)
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printf "chown --no-dereference %s:%s %s\n" ${NEW_U} ${NEW_G} "${P}"
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# chown --no-dereference ${NEW_U}:${NEW_G} "${P}"
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done
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cd /
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umount /mnt
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