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50 lines
1.3 KiB
50 lines
1.3 KiB
#!/bin/sh
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# Remap all files uid/gid to a new range using fuidshift
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#
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# This is a wrapper around `fuidshift` from `lxd-tools` Debian package for my use-case of LVM based root disks.
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#
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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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if [ "$(which fuidshift)" = "" ]; then
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echo "fuidshift binary not found. Please install lxd-tools package."
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exit 1
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fi
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CONTAINER_NAME="${1}"
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if [ "${CONTAINER_NAME}" = "" ] || [ "${CONTAINER_NAME}" = "--help" ] || [ "${CONTAINER_NAME}" = "-h" ]; then
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usage
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fi
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TARGET_LV="${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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# we get e.g. lxc.idmap = u 0 1000000 65535 and want u:0:1000000:65535
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USER_NAMESPACE=$(get-lxc-idmap-config u $CONTAINER_NAME | sed -r -e 's/.*= (.*)/\1/' -e 's/ /:/g')
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GROUP_NAMESPACE=$(get-lxc-idmap-config g $CONTAINER_NAME | sed -r -e 's/.*= (.*)/\1/' -e 's/ /:/g')
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printf "fuidshift %s %s %s\n" /mnt $USER_NAMESPACE $GROUP_NAMESPACE
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# fuidshift /mnt $USER_NAMESPACE $GROUP_NAMESPACE
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cd /
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umount /mnt
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