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#!/usr/bin/env sh
set -eux
LOG_FILE="/sd-zfs-rename.log"
exec 3>&1 4>&2
trap 'exec 2>&4 1>&3' 0 1 2 3
exec 1>${LOG_FILE} 2>&1
get_cmdline_value() {
local key="$1"
local value
value="$(cat /proc/cmdline | sed -e 's/ /\n/g' | grep "^${key}=" | cut -d= -f2)"
echo -n "${value}"
}
# Example: ZPOOL_NAME=zpool
ZPOOL_NAME="$(get_cmdline_value rpool)"
if [ -z "${ZPOOL_NAME}" ]; then
echo 'No "rpool=" found in kernel arguments, should have been equal to the zfs pool'
exit 1
fi
FS_SUFFIX_NEXT_BOOT="_next_boot"
FS_SUFFIX_OLD_BOOT="_old_boot"
# Example: ZPOOL_BOOTFS=zpool/ROOT/Distro_next_boot
ZPOOL_BOOTFS="$(zpool get -H bootfs "${ZPOOL_NAME}" | awk '{printf("%s", $3)}')"
# Currently GRUB_BOOT_IMAGE is not used but should be the same as ZPOOL_BOOTFS,
# it is a not guarantee
# Example: _GRUB_BOOT_IMAGE=zpool/ROOT/Distro_next_boot
_GRUB_BOOT_IMAGE="$(get_cmdline_value BOOT_IMAGE)"
GRUB_BOOT_IMAGE="${ZPOOL_NAME}${_GRUB_BOOT_IMAGE%@*}"
# Example: ZFS_BOOT=zpool/ROOT/Distro
# Example: ZFS_BOOT_OLD=zpool/ROOT/Distro_old_boot
ZFS_BOOT="${ZPOOL_BOOTFS%${FS_SUFFIX_NEXT_BOOT}}"
ZFS_BOOT_OLD="${ZFS_BOOT}${FS_SUFFIX_OLD_BOOT}"
# Example: ZPOOL_BOOTFS=zpool/ROOT/Distro_next_boot and end with FS_SUFFIX_NEXT_BOOT=_next_boot
if [[ "${ZPOOL_BOOTFS}" =~ ${FS_SUFFIX_NEXT_BOOT}$ ]]; then
# Example: If ZFS_BOOT=zpool/ROOT/Distro exists then it is rename to ZFS_BOOT_OLD=zpool/ROOT/Distro_old_boot
if zfs list -Ho name "${ZFS_BOOT}" > /dev/null 2&>1; then
zfs rename "${ZFS_BOOT}" "${ZFS_BOOT_OLD}"
fi
# Example: If ZPOOL_BOOTFS=zpool/ROOT/Distro_next_boot exists then it is rename to ZFS_BOOT=zpool/ROOT/Distro
zfs rename "${ZPOOL_BOOTFS}" "${ZFS_BOOT}"
# Example: The filesystem ZFS_BOOT=zpool/ROOT/Distro was cloned of ZFS_BOOT_OLD=zpool/ROOT/Distro_old_boot
# and should therefore be promoted
if zfs list -Ho origin "${ZFS_BOOT}" | grep "^${ZFS_BOOT_OLD}@" > /dev/null 2&>1; then
zfs promote "${ZFS_BOOT}"
fi
fi
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