990 lines
26 KiB
Plaintext
990 lines
26 KiB
Plaintext
# ZFS boot stub for initramfs-tools.
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#
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# In the initramfs environment, the /init script sources this stub to
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# override the default functions in the /scripts/local script.
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#
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# Enable this by passing boot=zfs on the kernel command line.
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#
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# Source the common init script
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. /etc/zfs/zfs-functions
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# Paths to what we need - in the initrd, these paths are hardcoded,
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# so override the defines in zfs-functions.
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ZFS="/usr/local/sbin/zfs"
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ZPOOL="/usr/local/sbin/zpool"
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ZPOOL_CACHE="/usr/local/etc/zfs/zpool.cache"
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export ZFS ZPOOL ZPOOL_CACHE
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# Start interactive shell.
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# Use debian's panic() if defined, because it allows to prevent shell access
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# by setting panic in cmdline (e.g. panic=0 or panic=15).
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# See "4.5 Disable root prompt on the initramfs" of Securing Debian Manual:
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# https://www.debian.org/doc/manuals/securing-debian-howto/ch4.en.html
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shell() {
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if type panic > /dev/null 2>&1; then
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panic $@
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else
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/bin/sh
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fi
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}
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# This runs any scripts that should run before we start importing
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# pools and mounting any filesystems.
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pre_mountroot()
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{
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if type run_scripts > /dev/null 2>&1 && \
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[ -f "/scripts/local-top" -o -d "/scripts/local-top" ]
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then
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[ "$quiet" != "y" ] && \
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zfs_log_begin_msg "Running /scripts/local-top"
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run_scripts /scripts/local-top
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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if type run_scripts > /dev/null 2>&1 && \
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[ -f "/scripts/local-premount" -o -d "/scripts/local-premount" ]
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then
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[ "$quiet" != "y" ] && \
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zfs_log_begin_msg "Running /scripts/local-premount"
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run_scripts /scripts/local-premount
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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}
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# If plymouth is available, hide the splash image.
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disable_plymouth()
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{
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if [ -x /bin/plymouth ] && /bin/plymouth --ping
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then
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/bin/plymouth hide-splash >/dev/null 2>&1
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fi
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}
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# Get a ZFS filesystem property value.
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get_fs_value()
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{
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local fs="$1"
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local value=$2
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"${ZFS}" get -H -ovalue $value "$fs" 2> /dev/null
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}
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# Find the 'bootfs' property on pool $1.
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# If the property does not contain '/', then ignore this
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# pool by exporting it again.
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find_rootfs()
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{
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local pool="$1"
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# If 'POOL_IMPORTED' isn't set, no pool imported and therefor
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# we won't be able to find a root fs.
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[ -z "${POOL_IMPORTED}" ] && return 1
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# If it's already specified, just keep it mounted and exit
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# User (kernel command line) must be correct.
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[ -n "${ZFS_BOOTFS}" ] && return 0
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# Not set, try to find it in the 'bootfs' property of the pool.
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# NOTE: zpool does not support 'get -H -ovalue bootfs'...
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ZFS_BOOTFS=$("${ZPOOL}" list -H -obootfs "$pool")
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# Make sure it's not '-' and that it starts with /.
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if [ "${ZFS_BOOTFS}" != "-" ] && \
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$(get_fs_value "${ZFS_BOOTFS}" mountpoint | grep -q '^/$')
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then
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# Keep it mounted
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POOL_IMPORTED=1
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return 0
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fi
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# Not boot fs here, export it and later try again..
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"${ZPOOL}" export "$pool"
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POOL_IMPORTED=""
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return 1
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}
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# Support function to get a list of all pools, separated with ';'
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find_pools()
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{
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local CMD="$*"
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local pools pool
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pools=$($CMD 2> /dev/null | \
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grep -E "pool:|^[a-zA-Z0-9]" | \
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sed 's@.*: @@' | \
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while read pool; do \
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echo -n "$pool;"
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done)
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echo "${pools%%;}" # Return without the last ';'.
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}
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# Get a list of all available pools
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get_pools()
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{
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local available_pools npools
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if [ -n "${ZFS_POOL_IMPORT}" ]; then
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echo "$ZFS_POOL_IMPORT"
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return 0
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fi
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# Get the base list of available pools.
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available_pools=$(find_pools "$ZPOOL" import)
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# Just in case - seen it happen (that a pool isn't visable/found
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# with a simple "zpool import" but only when using the "-d"
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# option or setting ZPOOL_IMPORT_PATH).
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if [ -d "/dev/disk/by-id" ]
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then
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npools=$(find_pools "$ZPOOL" import -d /dev/disk/by-id)
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if [ -n "$npools" ]
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then
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# Because we have found extra pool(s) here, which wasn't
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# found 'normally', we need to force USE_DISK_BY_ID to
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# make sure we're able to actually import it/them later.
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USE_DISK_BY_ID='yes'
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if [ -n "$available_pools" ]
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then
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# Filter out duplicates (pools found with the simple
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# "zpool import" but which is also found with the
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# "zpool import -d ...").
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npools=$(echo "$npools" | sed "s,$available_pools,,")
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# Add the list to the existing list of
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# available pools
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available_pools="$available_pools;$npools"
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else
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available_pools="$npools"
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fi
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fi
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fi
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# Filter out any exceptions...
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if [ -n "$ZFS_POOL_EXCEPTIONS" ]
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then
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local found=""
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local apools=""
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local pool exception
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OLD_IFS="$IFS" ; IFS=";"
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for pool in $available_pools
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do
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for exception in $ZFS_POOL_EXCEPTIONS
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do
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[ "$pool" = "$exception" ] && continue 2
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found="$pool"
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done
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if [ -n "$found" ]
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then
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if [ -n "$apools" ]
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then
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apools="$apools;$pool"
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else
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apools="$pool"
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fi
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fi
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done
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IFS="$OLD_IFS"
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available_pools="$apools"
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fi
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# Return list of available pools.
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echo "$available_pools"
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}
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# Import given pool $1
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import_pool()
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{
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local pool="$1"
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local dirs dir
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# Verify that the pool isn't already imported
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# Make as sure as we can to not require '-f' to import.
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"${ZPOOL}" get name,guid -o value -H 2>/dev/null | grep -Fxq "$pool" && return 0
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# For backwards compatibility, make sure that ZPOOL_IMPORT_PATH is set
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# to something we can use later with the real import(s). We want to
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# make sure we find all by* dirs, BUT by-vdev should be first (if it
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# exists).
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if [ -n "$USE_DISK_BY_ID" -a -z "$ZPOOL_IMPORT_PATH" ]
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then
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dirs="$(for dir in $(echo /dev/disk/by-*)
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do
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# Ignore by-vdev here - we want it first!
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echo "$dir" | grep -q /by-vdev && continue
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[ ! -d "$dir" ] && continue
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echo -n "$dir:"
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done | sed 's,:$,,g')"
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if [ -d "/dev/disk/by-vdev" ]
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then
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# Add by-vdev at the beginning.
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ZPOOL_IMPORT_PATH="/dev/disk/by-vdev:"
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fi
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# ... and /dev at the very end, just for good measure.
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ZPOOL_IMPORT_PATH="$ZPOOL_IMPORT_PATH$dirs:/dev"
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fi
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# Needs to be exported for "zpool" to catch it.
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[ -n "$ZPOOL_IMPORT_PATH" ] && export ZPOOL_IMPORT_PATH
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[ "$quiet" != "y" ] && zfs_log_begin_msg \
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"Importing pool '${pool}' using defaults"
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ZFS_CMD="${ZPOOL} import -N ${ZPOOL_FORCE} ${ZPOOL_IMPORT_OPTS}"
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ZFS_STDERR="$($ZFS_CMD "$pool" 2>&1)"
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ZFS_ERROR="$?"
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if [ "${ZFS_ERROR}" != 0 ]
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then
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[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
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if [ -f "${ZPOOL_CACHE}" ]
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then
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[ "$quiet" != "y" ] && zfs_log_begin_msg \
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"Importing pool '${pool}' using cachefile."
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ZFS_CMD="${ZPOOL} import -c ${ZPOOL_CACHE} -N ${ZPOOL_FORCE} ${ZPOOL_IMPORT_OPTS}"
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ZFS_STDERR="$($ZFS_CMD "$pool" 2>&1)"
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ZFS_ERROR="$?"
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fi
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if [ "${ZFS_ERROR}" != 0 ]
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then
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[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
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disable_plymouth
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echo ""
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echo "Command: ${ZFS_CMD} '$pool'"
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echo "Message: $ZFS_STDERR"
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echo "Error: $ZFS_ERROR"
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echo ""
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echo "Failed to import pool '$pool'."
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echo "Manually import the pool and exit."
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shell
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fi
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fi
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[ "$quiet" != "y" ] && zfs_log_end_msg
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POOL_IMPORTED=1
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return 0
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}
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# Load ZFS modules
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# Loading a module in a initrd require a slightly different approach,
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# with more logging etc.
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load_module_initrd()
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{
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if [ "$ZFS_INITRD_PRE_MOUNTROOT_SLEEP" > 0 ]
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then
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if [ "$quiet" != "y" ]; then
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zfs_log_begin_msg "Sleeping for" \
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"$ZFS_INITRD_PRE_MOUNTROOT_SLEEP seconds..."
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fi
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sleep "$ZFS_INITRD_PRE_MOUNTROOT_SLEEP"
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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# Wait for all of the /dev/{hd,sd}[a-z] device nodes to appear.
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if type wait_for_udev > /dev/null 2>&1 ; then
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wait_for_udev 10
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elif type wait_for_dev > /dev/null 2>&1 ; then
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wait_for_dev
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fi
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# zpool import refuse to import without a valid /proc/self/mounts
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[ ! -f /proc/self/mounts ] && mount proc /proc
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# Load the module
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load_module "zfs" || return 1
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if [ "$ZFS_INITRD_POST_MODPROBE_SLEEP" > 0 ]
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then
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if [ "$quiet" != "y" ]; then
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zfs_log_begin_msg "Sleeping for" \
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"$ZFS_INITRD_POST_MODPROBE_SLEEP seconds..."
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fi
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sleep "$ZFS_INITRD_POST_MODPROBE_SLEEP"
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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return 0
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}
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# Mount a given filesystem
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mount_fs()
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{
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local fs="$1"
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local mountpoint
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# Check that the filesystem exists
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"${ZFS}" list -oname -tfilesystem -H "${fs}" > /dev/null 2>&1
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[ "$?" -ne 0 ] && return 1
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# Skip filesystems with canmount=off. The root fs should not have
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# canmount=off, but ignore it for backwards compatibility just in case.
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if [ "$fs" != "${ZFS_BOOTFS}" ]
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then
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canmount=$(get_fs_value "$fs" canmount)
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[ "$canmount" = "off" ] && return 0
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fi
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# Need the _original_ datasets mountpoint!
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mountpoint=$(get_fs_value "$fs" mountpoint)
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if [ "$mountpoint" = "legacy" -o "$mountpoint" = "none" ]; then
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# Can't use the mountpoint property. Might be one of our
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# clones. Check the 'org.zol:mountpoint' property set in
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# clone_snap() if that's usable.
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mountpoint=$(get_fs_value "$fs" org.zol:mountpoint)
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if [ "$mountpoint" = "legacy" -o \
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"$mountpoint" = "none" -o \
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"$mountpoint" = "-" ]
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then
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if [ "$fs" != "${ZFS_BOOTFS}" ]; then
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# We don't have a proper mountpoint and this
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# isn't the root fs.
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return 0
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else
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# Last hail-mary: Hope 'rootmnt' is set!
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mountpoint=""
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fi
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fi
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if [ "$mountpoint" = "legacy" ]; then
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ZFS_CMD="mount -t zfs"
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else
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# If it's not a legacy filesystem, it can only be a
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# native one...
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ZFS_CMD="mount -o zfsutil -t zfs"
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fi
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else
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ZFS_CMD="mount -o zfsutil -t zfs"
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fi
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# Possibly decrypt a filesystem using native encryption.
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decrypt_fs "$fs"
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[ "$quiet" != "y" ] && \
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zfs_log_begin_msg "Mounting '${fs}' on '${rootmnt}/${mountpoint}'"
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[ -n "${ZFS_DEBUG}" ] && \
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zfs_log_begin_msg "CMD: '$ZFS_CMD ${fs} ${rootmnt}/${mountpoint}'"
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ZFS_STDERR=$(${ZFS_CMD} "${fs}" "${rootmnt}/${mountpoint}" 2>&1)
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ZFS_ERROR=$?
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if [ "${ZFS_ERROR}" != 0 ]
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then
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[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
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disable_plymouth
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echo ""
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echo "Command: ${ZFS_CMD} ${fs} ${rootmnt}/${mountpoint}"
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echo "Message: $ZFS_STDERR"
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echo "Error: $ZFS_ERROR"
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echo ""
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echo "Failed to mount ${fs} on ${rootmnt}/${mountpoint}."
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echo "Manually mount the filesystem and exit."
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shell
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else
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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return 0
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}
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# Unlock a ZFS native crypted filesystem.
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decrypt_fs()
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{
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local fs="$1"
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# If pool encryption is active and the zfs command understands '-o encryption'
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if [ "$(zpool list -H -o feature@encryption $(echo "${fs}" | awk -F\/ '{print $1}'))" = 'active' ]; then
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# Determine dataset that holds key for root dataset
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ENCRYPTIONROOT=$(${ZFS} get -H -o value encryptionroot "${fs}")
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DECRYPT_CMD="${ZFS} load-key '${ENCRYPTIONROOT}'"
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# If root dataset is encrypted...
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if ! [ "${ENCRYPTIONROOT}" = "-" ]; then
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# Prompt with plymouth, if active
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if [ -e /bin/plymouth ] && /bin/plymouth --ping 2>/dev/null; then
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plymouth ask-for-password --prompt "Encrypted ZFS password for ${ENCRYPTIONROOT}" \
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--number-of-tries="3" \
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--command="${DECRYPT_CMD}"
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# Prompt with systemd, if active
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elif [ -e /run/systemd/system ]; then
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TRY_COUNT=3
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while [ $TRY_COUNT -gt 0 ]; do
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systemd-ask-password "Encrypted ZFS password for ${ENCRYPTIONROOT}" --no-tty | \
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${DECRYPT_CMD} && break
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TRY_COUNT=$((TRY_COUNT - 1))
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done
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# Prompt with ZFS tty, otherwise
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else
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eval "${DECRYPT_CMD}"
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fi
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fi
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fi
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return 0
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}
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# Destroy a given filesystem.
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destroy_fs()
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{
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local fs="$1"
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[ "$quiet" != "y" ] && \
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zfs_log_begin_msg "Destroying '$fs'"
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ZFS_CMD="${ZFS} destroy $fs"
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ZFS_STDERR="$(${ZFS_CMD} 2>&1)"
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ZFS_ERROR="$?"
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if [ "${ZFS_ERROR}" != 0 ]
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then
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[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
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disable_plymouth
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echo ""
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echo "Command: $ZFS_CMD"
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echo "Message: $ZFS_STDERR"
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echo "Error: $ZFS_ERROR"
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echo ""
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echo "Failed to destroy '$fs'. Please make sure that '$fs' is not available."
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echo "Hint: Try: zfs destroy -Rfn $fs"
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echo "If this dryrun looks good, then remove the 'n' from '-Rfn' and try again."
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shell
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else
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[ "$quiet" != "y" ] && zfs_log_end_msg
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fi
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return 0
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}
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# Clone snapshot $1 to destination filesystem $2
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# Set 'canmount=noauto' and 'mountpoint=none' so that we get to keep
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# manual control over it's mounting (i.e., make sure it's not automatically
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# mounted with a 'zfs mount -a' in the init/systemd scripts).
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clone_snap()
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{
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local snap="$1"
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local destfs="$2"
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local mountpoint="$3"
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[ "$quiet" != "y" ] && zfs_log_begin_msg "Cloning '$snap' to '$destfs'"
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# Clone the snapshot into a dataset we can boot from
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# + We don't want this filesystem to be automatically mounted, we
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# want control over this here and nowhere else.
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# + We don't need any mountpoint set for the same reason.
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# We use the 'org.zol:mountpoint' property to remember the mountpoint.
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ZFS_CMD="${ZFS} clone -o canmount=noauto -o mountpoint=none"
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ZFS_CMD="${ZFS_CMD} -o org.zol:mountpoint=${mountpoint}"
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ZFS_CMD="${ZFS_CMD} $snap $destfs"
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ZFS_STDERR="$(${ZFS_CMD} 2>&1)"
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ZFS_ERROR="$?"
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if [ "${ZFS_ERROR}" != 0 ]
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then
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[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
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disable_plymouth
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echo ""
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echo "Command: $ZFS_CMD"
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echo "Message: $ZFS_STDERR"
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echo "Error: $ZFS_ERROR"
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echo ""
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echo "Failed to clone snapshot."
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echo "Make sure that the any problems are corrected and then make sure"
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echo "that the dataset '$destfs' exists and is bootable."
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shell
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else
|
|
[ "$quiet" != "y" ] && zfs_log_end_msg
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# Rollback a given snapshot.
|
|
rollback_snap()
|
|
{
|
|
local snap="$1"
|
|
|
|
[ "$quiet" != "y" ] && zfs_log_begin_msg "Rollback $snap"
|
|
|
|
ZFS_CMD="${ZFS} rollback -Rf $snap"
|
|
ZFS_STDERR="$(${ZFS_CMD} 2>&1)"
|
|
ZFS_ERROR="$?"
|
|
if [ "${ZFS_ERROR}" != 0 ]
|
|
then
|
|
[ "$quiet" != "y" ] && zfs_log_failure_msg "${ZFS_ERROR}"
|
|
|
|
disable_plymouth
|
|
echo ""
|
|
echo "Command: $ZFS_CMD"
|
|
echo "Message: $ZFS_STDERR"
|
|
echo "Error: $ZFS_ERROR"
|
|
echo ""
|
|
echo "Failed to rollback snapshot."
|
|
shell
|
|
else
|
|
[ "$quiet" != "y" ] && zfs_log_end_msg
|
|
fi
|
|
|
|
return 0
|
|
}
|
|
|
|
# Get a list of snapshots, give them as a numbered list
|
|
# to the user to choose from.
|
|
ask_user_snap()
|
|
{
|
|
local fs="$1"
|
|
local i=1
|
|
local SNAP snapnr snap debug
|
|
|
|
# We need to temporarily disable debugging. Set 'debug' so we
|
|
# remember to enabled it again.
|
|
if [ -n "${ZFS_DEBUG}" ]; then
|
|
unset ZFS_DEBUG
|
|
set +x
|
|
debug=1
|
|
fi
|
|
|
|
# Because we need the resulting snapshot, which is sent on
|
|
# stdout to the caller, we use stderr for our questions.
|
|
echo "What snapshot do you want to boot from?" > /dev/stderr
|
|
while read snap; do
|
|
echo " $i: ${snap}" > /dev/stderr
|
|
eval `echo SNAP_$i=$snap`
|
|
i=$((i + 1))
|
|
done <<EOT
|
|
$("${ZFS}" list -H -oname -tsnapshot -r "${fs}")
|
|
EOT
|
|
|
|
echo -n " Snap nr [1-$((i-1))]? " > /dev/stderr
|
|
read snapnr
|
|
|
|
# Re-enable debugging.
|
|
if [ -n "${debug}" ]; then
|
|
ZFS_DEBUG=1
|
|
set -x
|
|
fi
|
|
|
|
echo "$(eval echo "$"SNAP_$snapnr)"
|
|
}
|
|
|
|
setup_snapshot_booting()
|
|
{
|
|
local snap="$1"
|
|
local s destfs subfs mountpoint retval=0 filesystems fs
|
|
|
|
# Make sure that the snapshot specified actually exist.
|
|
if [ ! $(get_fs_value "${snap}" type) ]
|
|
then
|
|
# Snapshot does not exist (...@<null> ?)
|
|
# ask the user for a snapshot to use.
|
|
snap="$(ask_user_snap "${snap%%@*}")"
|
|
fi
|
|
|
|
# Separate the full snapshot ('$snap') into it's filesystem and
|
|
# snapshot names. Would have been nice with a split() function..
|
|
rootfs="${snap%%@*}"
|
|
snapname="${snap##*@}"
|
|
ZFS_BOOTFS="${rootfs}_${snapname}"
|
|
|
|
if ! grep -qiE '(^|[^\\](\\\\)* )(rollback)=(on|yes|1)( |$)' /proc/cmdline
|
|
then
|
|
# If the destination dataset for the clone
|
|
# already exists, destroy it. Recursivly
|
|
if [ $(get_fs_value "${rootfs}_${snapname}" type) ]; then
|
|
filesystems=$("${ZFS}" list -oname -tfilesystem -H \
|
|
-r -Sname "${ZFS_BOOTFS}")
|
|
for fs in $filesystems; do
|
|
destroy_fs "${fs}"
|
|
done
|
|
fi
|
|
fi
|
|
|
|
# Get all snapshots, recursivly (might need to clone /usr, /var etc
|
|
# as well).
|
|
for s in $("${ZFS}" list -H -oname -tsnapshot -r "${rootfs}" | \
|
|
grep "${snapname}")
|
|
do
|
|
if grep -qiE '(^|[^\\](\\\\)* )(rollback)=(on|yes|1)( |$)' /proc/cmdline
|
|
then
|
|
# Rollback snapshot
|
|
rollback_snap "$s" || retval=$((retval + 1))
|
|
else
|
|
# Setup a destination filesystem name.
|
|
# Ex: Called with 'rpool/ROOT/debian@snap2'
|
|
# rpool/ROOT/debian@snap2 => rpool/ROOT/debian_snap2
|
|
# rpool/ROOT/debian/boot@snap2 => rpool/ROOT/debian_snap2/boot
|
|
# rpool/ROOT/debian/usr@snap2 => rpool/ROOT/debian_snap2/usr
|
|
# rpool/ROOT/debian/var@snap2 => rpool/ROOT/debian_snap2/var
|
|
subfs="${s##$rootfs}"
|
|
subfs="${subfs%%@$snapname}"
|
|
|
|
destfs="${rootfs}_${snapname}" # base fs.
|
|
[ -n "$subfs" ] && destfs="${destfs}$subfs" # + sub fs.
|
|
|
|
# Get the mountpoint of the filesystem, to be used
|
|
# with clone_snap(). If legacy or none, then use
|
|
# the sub fs value.
|
|
mountpoint=$(get_fs_value "${s%%@*}" mountpoint)
|
|
if [ "$mountpoint" = "legacy" -o \
|
|
"$mountpoint" = "none" ]
|
|
then
|
|
if [ -n "${subfs}" ]; then
|
|
mountpoint="${subfs}"
|
|
else
|
|
mountpoint="/"
|
|
fi
|
|
fi
|
|
|
|
# Clone the snapshot into its own
|
|
# filesystem
|
|
clone_snap "$s" "${destfs}" "${mountpoint}" || \
|
|
retval=$((retval + 1))
|
|
fi
|
|
done
|
|
|
|
# If we haven't return yet, we have a problem...
|
|
return "${retval}"
|
|
}
|
|
|
|
# ================================================================
|
|
|
|
# This is the main function.
|
|
mountroot()
|
|
{
|
|
local snaporig snapsub destfs pool POOLS
|
|
|
|
# ----------------------------------------------------------------
|
|
# I N I T I A L S E T U P
|
|
|
|
# ------------
|
|
# Run the pre-mount scripts from /scripts/local-top.
|
|
pre_mountroot
|
|
|
|
# ------------
|
|
# Source the default setup variables.
|
|
[ -r '/etc/default/zfs' ] && . /etc/default/zfs
|
|
|
|
# ------------
|
|
# Support debug option
|
|
if grep -qiE '(^|[^\\](\\\\)* )(zfs_debug|zfs\.debug|zfsdebug)=(on|yes|1)( |$)' /proc/cmdline
|
|
then
|
|
ZFS_DEBUG=1
|
|
mkdir /var/log
|
|
#exec 2> /var/log/boot.debug
|
|
set -x
|
|
fi
|
|
|
|
# ------------
|
|
# Load ZFS module etc.
|
|
if ! load_module_initrd; then
|
|
disable_plymouth
|
|
echo ""
|
|
echo "Failed to load ZFS modules."
|
|
echo "Manually load the modules and exit."
|
|
shell
|
|
fi
|
|
|
|
# ------------
|
|
# Look for the cache file (if any).
|
|
[ ! -f ${ZPOOL_CACHE} ] && unset ZPOOL_CACHE
|
|
|
|
# ------------
|
|
# Compatibility: 'ROOT' is for Debian GNU/Linux (etc),
|
|
# 'root' is for Redhat/Fedora (etc),
|
|
# 'REAL_ROOT' is for Gentoo
|
|
if [ -z "$ROOT" ]
|
|
then
|
|
[ -n "$root" ] && ROOT=${root}
|
|
|
|
[ -n "$REAL_ROOT" ] && ROOT=${REAL_ROOT}
|
|
fi
|
|
|
|
# ------------
|
|
# Where to mount the root fs in the initrd - set outside this script
|
|
# Compatibility: 'rootmnt' is for Debian GNU/Linux (etc),
|
|
# 'NEWROOT' is for RedHat/Fedora (etc),
|
|
# 'NEW_ROOT' is for Gentoo
|
|
if [ -z "$rootmnt" ]
|
|
then
|
|
[ -n "$NEWROOT" ] && rootmnt=${NEWROOT}
|
|
|
|
[ -n "$NEW_ROOT" ] && rootmnt=${NEW_ROOT}
|
|
fi
|
|
|
|
# ------------
|
|
# No longer set in the defaults file, but it could have been set in
|
|
# get_pools() in some circumstances. If it's something, but not 'yes',
|
|
# it's no good to us.
|
|
[ -n "$USE_DISK_BY_ID" -a "$USE_DISK_BY_ID" != 'yes' ] && \
|
|
unset USE_DISK_BY_ID
|
|
|
|
# ----------------------------------------------------------------
|
|
# P A R S E C O M M A N D L I N E O P T I O N S
|
|
|
|
# This part is the really ugly part - there's so many options and permutations
|
|
# 'out there', and if we should make this the 'primary' source for ZFS initrd
|
|
# scripting, we need/should support them all.
|
|
#
|
|
# Supports the following kernel command line argument combinations
|
|
# (in this order - first match win):
|
|
#
|
|
# rpool=<pool> (tries to finds bootfs automatically)
|
|
# bootfs=<pool>/<dataset> (uses this for rpool - first part)
|
|
# rpool=<pool> bootfs=<pool>/<dataset>
|
|
# -B zfs-bootfs=<pool>/<fs> (uses this for rpool - first part)
|
|
# rpool=rpool (default if none of the above is used)
|
|
# root=<pool>/<dataset> (uses this for rpool - first part)
|
|
# root=ZFS=<pool>/<dataset> (uses this for rpool - first part, without 'ZFS=')
|
|
# root=zfs:AUTO (tries to detect both pool and rootfs
|
|
# root=zfs:<pool>/<dataset> (uses this for rpool - first part, without 'zfs:')
|
|
#
|
|
# Option <dataset> could also be <snapshot>
|
|
# Option <pool> could also be <guid>
|
|
|
|
# ------------
|
|
# Support force option
|
|
# In addition, setting one of zfs_force, zfs.force or zfsforce to
|
|
# 'yes', 'on' or '1' will make sure we force import the pool.
|
|
# This should (almost) never be needed, but it's here for
|
|
# completeness.
|
|
ZPOOL_FORCE=""
|
|
if grep -qiE '(^|[^\\](\\\\)* )(zfs_force|zfs\.force|zfsforce)=(on|yes|1)( |$)' /proc/cmdline
|
|
then
|
|
ZPOOL_FORCE="-f"
|
|
fi
|
|
|
|
# ------------
|
|
# Look for 'rpool' and 'bootfs' parameter
|
|
[ -n "$rpool" ] && ZFS_RPOOL="${rpool#rpool=}"
|
|
[ -n "$bootfs" ] && ZFS_BOOTFS="${bootfs#bootfs=}"
|
|
|
|
# ------------
|
|
# If we have 'ROOT' (see above), but not 'ZFS_BOOTFS', then use
|
|
# 'ROOT'
|
|
[ -n "$ROOT" -a -z "${ZFS_BOOTFS}" ] && ZFS_BOOTFS="$ROOT"
|
|
|
|
# ------------
|
|
# Check for the `-B zfs-bootfs=%s/%u,...` kind of parameter.
|
|
# NOTE: Only use the pool name and dataset. The rest is not
|
|
# supported by ZoL (whatever it's for).
|
|
if [ -z "$ZFS_RPOOL" ]
|
|
then
|
|
# The ${zfs-bootfs} variable is set at the kernel command
|
|
# line, usually by GRUB, but it cannot be referenced here
|
|
# directly because bourne variable names cannot contain a
|
|
# hyphen.
|
|
#
|
|
# Reassign the variable by dumping the environment and
|
|
# stripping the zfs-bootfs= prefix. Let the shell handle
|
|
# quoting through the eval command.
|
|
eval ZFS_RPOOL=$(set | sed -n -e 's,^zfs-bootfs=,,p')
|
|
fi
|
|
|
|
# ------------
|
|
# No root fs or pool specified - do auto detect.
|
|
if [ -z "$ZFS_RPOOL" -a -z "${ZFS_BOOTFS}" ]
|
|
then
|
|
# Do auto detect. Do this by 'cheating' - set 'root=zfs:AUTO'
|
|
# which will be caught later
|
|
ROOT=zfs:AUTO
|
|
fi
|
|
|
|
# ----------------------------------------------------------------
|
|
# F I N D A N D I M P O R T C O R R E C T P O O L
|
|
|
|
# ------------
|
|
if [ "$ROOT" = "zfs:AUTO" ]
|
|
then
|
|
# Try to detect both pool and root fs.
|
|
|
|
[ "$quiet" != "y" ] && \
|
|
zfs_log_begin_msg "Attempting to import additional pools."
|
|
|
|
# Get a list of pools available for import
|
|
if [ -n "$ZFS_RPOOL" ]
|
|
then
|
|
# We've specified a pool - check only that
|
|
POOLS=$ZFS_RPOOL
|
|
else
|
|
POOLS=$(get_pools)
|
|
fi
|
|
|
|
OLD_IFS="$IFS" ; IFS=";"
|
|
for pool in $POOLS
|
|
do
|
|
[ -z "$pool" ] && continue
|
|
|
|
import_pool "$pool"
|
|
find_rootfs "$pool"
|
|
done
|
|
IFS="$OLD_IFS"
|
|
|
|
[ "$quiet" != "y" ] && zfs_log_end_msg $ZFS_ERROR
|
|
else
|
|
# No auto - use value from the command line option.
|
|
|
|
# Strip 'zfs:' and 'ZFS='.
|
|
ZFS_BOOTFS="${ROOT#*[:=]}"
|
|
|
|
# Stip everything after the first slash.
|
|
ZFS_RPOOL="${ZFS_BOOTFS%%/*}"
|
|
fi
|
|
|
|
# Import the pool (if not already done so in the AUTO check above).
|
|
if [ -n "$ZFS_RPOOL" -a -z "${POOL_IMPORTED}" ]
|
|
then
|
|
[ "$quiet" != "y" ] && \
|
|
zfs_log_begin_msg "Importing ZFS root pool '$ZFS_RPOOL'"
|
|
|
|
import_pool "${ZFS_RPOOL}"
|
|
find_rootfs "${ZFS_RPOOL}"
|
|
|
|
[ "$quiet" != "y" ] && zfs_log_end_msg
|
|
fi
|
|
|
|
if [ -z "${POOL_IMPORTED}" ]
|
|
then
|
|
# No pool imported, this is serious!
|
|
disable_plymouth
|
|
echo ""
|
|
echo "Command: $ZFS_CMD"
|
|
echo "Message: $ZFS_STDERR"
|
|
echo "Error: $ZFS_ERROR"
|
|
echo ""
|
|
echo "No pool imported. Manually import the root pool"
|
|
echo "at the command prompt and then exit."
|
|
echo "Hint: Try: zpool import -R ${rootmnt} -N ${ZFS_RPOOL}"
|
|
shell
|
|
fi
|
|
|
|
# In case the pool was specified as guid, resolve guid to name
|
|
pool="$("${ZPOOL}" get name,guid -o name,value -H | \
|
|
awk -v pool="${ZFS_RPOOL}" '$2 == pool { print $1 }')"
|
|
if [ -n "$pool" ]; then
|
|
# If $ZFS_BOOTFS contains guid, replace the guid portion with $pool
|
|
ZFS_BOOTFS=$(echo "$ZFS_BOOTFS" | \
|
|
sed -e "s/$("${ZPOOL}" get guid -o value "$pool" -H)/$pool/g")
|
|
ZFS_RPOOL="${pool}"
|
|
fi
|
|
|
|
# Set elevator=noop on the root pool's vdevs' disks. ZFS already
|
|
# does this for wholedisk vdevs (for all pools), so this is only
|
|
# important for partitions.
|
|
"${ZPOOL}" status -L "${ZFS_RPOOL}" 2> /dev/null |
|
|
awk '/^\t / && !/(mirror|raidz)/ {
|
|
dev=$1;
|
|
sub(/[0-9]+$/, "", dev);
|
|
print dev
|
|
}' |
|
|
while read i
|
|
do
|
|
if grep -sq noop /sys/block/$i/queue/scheduler
|
|
then
|
|
echo noop > "/sys/block/$i/queue/scheduler"
|
|
fi
|
|
done
|
|
|
|
|
|
# ----------------------------------------------------------------
|
|
# P R E P A R E R O O T F I L E S Y S T E M
|
|
|
|
if [ -n "${ZFS_BOOTFS}" ]
|
|
then
|
|
# Booting from a snapshot?
|
|
# Will overwrite the ZFS_BOOTFS variable like so:
|
|
# rpool/ROOT/debian@snap2 => rpool/ROOT/debian_snap2
|
|
echo "${ZFS_BOOTFS}" | grep -q '@' && \
|
|
setup_snapshot_booting "${ZFS_BOOTFS}"
|
|
fi
|
|
|
|
if [ -z "${ZFS_BOOTFS}" ]
|
|
then
|
|
# Still nothing! Let the user sort this out.
|
|
disable_plymouth
|
|
echo ""
|
|
echo "Error: Unknown root filesystem - no 'bootfs' pool property and"
|
|
echo " not specified on the kernel command line."
|
|
echo ""
|
|
echo "Manually mount the root filesystem on $rootmnt and then exit."
|
|
echo "Hint: Try: mount -o zfsutil -t zfs ${ZFS_RPOOL-rpool}/ROOT/system $rootmnt"
|
|
shell
|
|
fi
|
|
|
|
# ----------------------------------------------------------------
|
|
# M O U N T F I L E S Y S T E M S
|
|
|
|
# * Ideally, the root filesystem would be mounted like this:
|
|
#
|
|
# zpool import -R "$rootmnt" -N "$ZFS_RPOOL"
|
|
# zfs mount -o mountpoint=/ "${ZFS_BOOTFS}"
|
|
#
|
|
# but the MOUNTPOINT prefix is preserved on descendent filesystem
|
|
# after the pivot into the regular root, which later breaks things
|
|
# like `zfs mount -a` and the /proc/self/mounts refresh.
|
|
#
|
|
# * Mount additional filesystems required
|
|
# Such as /usr, /var, /usr/local etc.
|
|
# NOTE: Mounted in the order specified in the
|
|
# ZFS_INITRD_ADDITIONAL_DATASETS variable so take care!
|
|
|
|
# Go through the complete list (recursively) of all filesystems below
|
|
# the real root dataset
|
|
filesystems=$("${ZFS}" list -oname -tfilesystem -H -r "${ZFS_BOOTFS}")
|
|
for fs in $filesystems $ZFS_INITRD_ADDITIONAL_DATASETS
|
|
do
|
|
mount_fs "$fs"
|
|
done
|
|
|
|
# ------------
|
|
# Debugging information
|
|
if [ -n "${ZFS_DEBUG}" ]
|
|
then
|
|
#exec 2>&1-
|
|
|
|
echo "DEBUG: imported pools:"
|
|
"${ZPOOL}" list -H
|
|
echo
|
|
|
|
echo "DEBUG: mounted ZFS filesystems:"
|
|
mount | grep zfs
|
|
echo
|
|
|
|
echo "=> waiting for ENTER before continuing because of 'zfsdebug=1'. "
|
|
echo -n " 'c' for shell, 'r' for reboot, 'ENTER' to continue. "
|
|
read b
|
|
|
|
[ "$b" = "c" ] && /bin/sh
|
|
[ "$b" = "r" ] && reboot -f
|
|
|
|
set +x
|
|
fi
|
|
|
|
# ------------
|
|
# Run local bottom script
|
|
if type run_scripts > /dev/null 2>&1 && \
|
|
[ -f "/scripts/local-bottom" -o -d "/scripts/local-bottom" ]
|
|
then
|
|
[ "$quiet" != "y" ] && \
|
|
zfs_log_begin_msg "Running /scripts/local-bottom"
|
|
run_scripts /scripts/local-bottom
|
|
[ "$quiet" != "y" ] && zfs_log_end_msg
|
|
fi
|
|
}
|