142 lines
3 KiB
Bash
142 lines
3 KiB
Bash
# overlay functions to manipulate squashfs manually
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#= obm
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a__overlay_bind_mount() {
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local directory
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for directory in "dev" "dev/pts" "proc" "sys"; do
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if ! mount --bind "/${directory}" "overlay/mount/${directory}"; then
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rwx_log_error "Unable to bind mount directory: ${directory}"
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return 1
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fi
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done
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}
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#= obu
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a__overlay_bind_unmount() {
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local directory
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for directory in "sys" "proc" "dev/pts" "dev"; do
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if ! umount --lazy "overlay/mount/${directory}"; then
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rwx_log_error "Unable to bind unmount directory: ${directory}"
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return 1
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fi
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done
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}
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#= ocr
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a__overlay_command_root() {
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chroot \
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"overlay/mount" "${@}"
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}
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#= ocu
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a__overlay_command_user() {
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chroot \
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--userspec "1000:1000" \
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"overlay/mount" "${@}"
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}
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#= omm
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a__overlay_mirror_mount() {
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mount --make-rslave --rbind "/deb" "overlay/mount/deb"
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}
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#= omu
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a__overlay_mirror_unmount() {
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umount --recursive "overlay/mount/deb"
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}
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#= orm
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a__overlay_root_mount() {
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local root="${1}"
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if [ -z "${root}" ]; then
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rwx_log_error "No root target directory"
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return 1
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fi
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root="$(realpath "${root}")"
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if ! mkdir "overlay"; then
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rwx_log_error "Unable to make overlay directory"
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return 2
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fi
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(
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if ! cd "overlay"; then
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rwx_log_error "Unable to move into overlay directory"
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return 3
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fi
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local directory
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for directory in "lower" "upper" "work" "mount"; do
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if ! mkdir --parents "${directory}"; then
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rwx_log_error "Unable to make directory: ${directory}"
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return 4
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fi
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done
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local file="${root}/filesystem.squashfs"
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if ! mount "${file}" "lower"; then
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rwx_log_error "Unable to lower mount: ${file}"
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return 5
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fi
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if ! mount \
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-o "lowerdir=lower,upperdir=upper,workdir=work" \
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-t "overlay" \
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"overlay" "mount"; then
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rwx_log_error "Unable to overlay mount"
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return 6
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fi
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)
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}
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#= ors
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a__overlay_root_squash() {
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local directory="${1}"
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local file
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local level="${2}"
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if [ -n "${directory}" ]; then
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if mkdir "${directory}"; then
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[ -n "${level}" ] || level="18"
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for file in "vmlinuz" "initrd.img"; do
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cp "overlay/mount/${file}" "${directory}"
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done
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mksquashfs \
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"overlay/mount" "${directory}/filesystem.squashfs" \
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-noappend \
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-comp "zstd" -Xcompression-level "${level}"
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chown --recursive 1000:1000 "${directory}"
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fi
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fi
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}
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#= oru
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a__overlay_root_unmount() {
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(
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if ! cd "overlay"; then
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rwx_log_error "Unable to move into overlay directory"
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return 1
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fi
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if ! umount "mount"; then
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rwx_log_error "Unable to unmount mount directory"
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return 2
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fi
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if ! rmdir "mount"; then
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rwx_log_error "Unable to remove mount directory"
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return 3
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fi
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local directory
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for directory in "upper" "work"; do
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if ! rm --force --recursive "${directory}"; then
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rwx_log_error "Unable to remove directory: ${directory}"
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return 4
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fi
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done
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if ! umount "lower"; then
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rwx_log_error "Unable to unmount lower directory"
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return 5
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fi
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if ! rmdir "lower"; then
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rwx_log_error "Unable to remove lower directory"
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return 6
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fi
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)
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if ! rmdir "overlay"; then
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rwx_log_error "Unable to remove overlay directory"
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return 7
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fi
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}
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