433 lines
9.5 KiB
Plaintext
433 lines
9.5 KiB
Plaintext
# This is a script with common functions etc used by zfs-import, zfs-mount,
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# zfs-share and zfs-zed.
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#
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# It is _NOT_ to be called independently
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#
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# Released under the 2-clause BSD license.
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#
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# The original script that acted as a template for this script came from
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# the Debian GNU/Linux kFreeBSD ZFS packages (which did not include a
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# licensing stansa) in the commit dated Mar 24, 2011:
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# https://github.com/zfsonlinux/pkg-zfs/commit/80a3ae582b59c0250d7912ba794dca9e669e605a
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PATH=/sbin:/bin:/usr/bin:/usr/sbin
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# Source function library
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if [ -f /etc/rc.d/init.d/functions ]; then
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# RedHat and derivates
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. /etc/rc.d/init.d/functions
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elif [ -L /etc/init.d/functions.sh ]; then
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# Gentoo
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. /etc/init.d/functions.sh
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elif [ -f /lib/lsb/init-functions ]; then
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# LSB, Debian GNU/Linux and derivates
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. /lib/lsb/init-functions
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fi
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# Of course the functions we need are called differently
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# on different distributions - it would be way too easy
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# otherwise!!
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if type log_failure_msg > /dev/null 2>&1 ; then
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# LSB functions - fall through
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zfs_log_begin_msg() { log_begin_msg "$1"; }
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zfs_log_end_msg() { log_end_msg "$1"; }
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zfs_log_failure_msg() { log_failure_msg "$1"; }
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zfs_log_progress_msg() { log_progress_msg "$1"; }
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elif type success > /dev/null 2>&1 ; then
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# Fedora/RedHat functions
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zfs_set_ifs() {
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# For some reason, the init function library have a problem
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# with a changed IFS, so this function goes around that.
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local tIFS="$1"
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if [ -n "$tIFS" ]
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then
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TMP_IFS="$IFS"
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IFS="$tIFS"
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fi
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}
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zfs_log_begin_msg() { echo -n "$1 "; }
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zfs_log_end_msg() {
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zfs_set_ifs "$OLD_IFS"
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if [ "$1" -eq 0 ]; then
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success
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else
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failure
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fi
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echo
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zfs_set_ifs "$TMP_IFS"
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}
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zfs_log_failure_msg() {
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zfs_set_ifs "$OLD_IFS"
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failure
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echo
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zfs_set_ifs "$TMP_IFS"
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}
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zfs_log_progress_msg() { echo -n $"$1"; }
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elif type einfo > /dev/null 2>&1 ; then
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# Gentoo functions
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zfs_log_begin_msg() { ebegin "$1"; }
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zfs_log_end_msg() { eend "$1"; }
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zfs_log_failure_msg() { eend "$1"; }
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# zfs_log_progress_msg() { echo -n "$1"; }
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zfs_log_progress_msg() { echo -n; }
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else
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# Unknown - simple substitutes.
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zfs_log_begin_msg() { echo -n "$1"; }
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zfs_log_end_msg() {
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ret=$1
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if [ "$ret" -ge 1 ]; then
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echo " failed!"
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else
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echo " success"
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fi
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return "$ret"
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}
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zfs_log_failure_msg() { echo "$1"; }
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zfs_log_progress_msg() { echo -n "$1"; }
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fi
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# Paths to what we need
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ZFS="@sbindir@/zfs"
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ZED="@sbindir@/zed"
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ZPOOL="@sbindir@/zpool"
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ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
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# Sensible defaults
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ZFS_MOUNT='yes'
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ZFS_UNMOUNT='yes'
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export ZFS ZED ZPOOL ZPOOL_CACHE ZFS_MOUNT ZFS_UNMOUNT
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# Source zfs configuration, overriding the defaults
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if [ -f @initconfdir@/zfs ]; then
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. @initconfdir@/zfs
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fi
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# ----------------------------------------------------
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zfs_action()
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{
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local MSG="$1"; shift
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local CMD="$*"
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local ret
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zfs_log_begin_msg "$MSG "
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$CMD
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ret=$?
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if [ "$ret" -eq 0 ]; then
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zfs_log_end_msg $ret
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else
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zfs_log_failure_msg $ret
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fi
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return $ret
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}
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# Returns
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# 0 if daemon has been started
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# 1 if daemon was already running
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# 2 if daemon could not be started
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# 3 if unsupported
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#
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zfs_daemon_start()
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{
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local PIDFILE="$1"; shift
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local DAEMON_BIN="$1"; shift
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local DAEMON_ARGS="$*"
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if type start-stop-daemon > /dev/null 2>&1 ; then
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# LSB functions
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start-stop-daemon --start --quiet --pidfile "$PIDFILE" \
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--exec "$DAEMON_BIN" --test > /dev/null || return 1
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start-stop-daemon --start --quiet --exec "$DAEMON_BIN" -- \
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$DAEMON_ARGS || return 2
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# On Debian GNU/Linux, there's a 'sendsigs' script that will
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# kill basically everything quite early and zed is stopped
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# much later than that. We don't want zed to be among them,
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# so add the zed pid to list of pids to ignore.
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if [ -f "$PIDFILE" -a -d /run/sendsigs.omit.d ]
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then
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ln -sf "$PIDFILE" /run/sendsigs.omit.d/zed
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fi
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elif type daemon > /dev/null 2>&1 ; then
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# Fedora/RedHat functions
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daemon --pidfile "$PIDFILE" "$DAEMON_BIN" $DAEMON_ARGS
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return $?
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else
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# Unsupported
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return 3
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fi
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return 0
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}
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# Returns
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# 0 if daemon has been stopped
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# 1 if daemon was already stopped
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# 2 if daemon could not be stopped
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# 3 if unsupported
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#
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zfs_daemon_stop()
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{
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local PIDFILE="$1"
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local DAEMON_BIN="$2"
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local DAEMON_NAME="$3"
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if type start-stop-daemon > /dev/null 2>&1 ; then
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# LSB functions
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start-stop-daemon --stop --quiet --retry=TERM/30/KILL/5 \
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--pidfile "$PIDFILE" --name "$DAEMON_NAME"
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[ "$?" = 0 ] && rm -f "$PIDFILE"
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return $?
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elif type killproc > /dev/null 2>&1 ; then
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# Fedora/RedHat functions
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killproc -p "$PIDFILE" "$DAEMON_NAME"
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[ "$?" = 0 ] && rm -f "$PIDFILE"
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return $?
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else
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# Unsupported
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return 3
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fi
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return 0
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}
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# Returns status
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zfs_daemon_status()
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{
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local PIDFILE="$1"
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local DAEMON_BIN="$2"
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local DAEMON_NAME="$3"
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if type status_of_proc > /dev/null 2>&1 ; then
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# LSB functions
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status_of_proc "$DAEMON_NAME" "$DAEMON_BIN"
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return $?
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elif type status > /dev/null 2>&1 ; then
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# Fedora/RedHat functions
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status -p "$PIDFILE" "$DAEMON_NAME"
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return $?
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else
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# Unsupported
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return 3
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fi
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return 0
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}
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zfs_daemon_reload()
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{
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local PIDFILE="$1"
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local DAEMON_NAME="$2"
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if type start-stop-daemon > /dev/null 2>&1 ; then
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# LSB functions
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start-stop-daemon --stop --signal 1 --quiet \
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--pidfile "$PIDFILE" --name "$DAEMON_NAME"
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return $?
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elif type killproc > /dev/null 2>&1 ; then
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# Fedora/RedHat functions
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killproc -p "$PIDFILE" "$DAEMON_NAME" -HUP
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return $?
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else
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# Unsupported
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return 3
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fi
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return 0
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}
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zfs_installed()
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{
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if [ ! -x "$ZPOOL" ]; then
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return 1
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else
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# Test if it works (will catch missing/broken libs etc)
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"$ZPOOL" -? > /dev/null 2>&1
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return $?
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fi
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if [ ! -x "$ZFS" ]; then
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return 2
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else
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# Test if it works (will catch missing/broken libs etc)
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"$ZFS" -? > /dev/null 2>&1
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return $?
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fi
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return 0
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}
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# Trigger udev and wait for it to settle.
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udev_trigger()
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{
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if [ -x /sbin/udevadm ]; then
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/sbin/udevadm trigger --action=change --subsystem-match=block
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/sbin/udevadm settle
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elif [ -x /sbin/udevsettle ]; then
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/sbin/udevtrigger
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/sbin/udevsettle
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fi
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}
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# Do a lot of checks to make sure it's 'safe' to continue with the import.
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checksystem()
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{
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if grep -qiE '(^|[^\\](\\\\)* )zfs=(off|no|0)( |$)' /proc/cmdline;
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then
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# Called with zfs=(off|no|0) - bail because we don't
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# want anything import, mounted or shared.
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# HOWEVER, only do this if we're called at the boot up
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# (from init), not if we're running interactively (as in
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# from the shell - we know what we're doing).
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[ -n "$init" ] && exit 3
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fi
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# Check if ZFS is installed.
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zfs_installed || return 5
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# Just make sure that /dev/zfs is created.
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udev_trigger
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return 0
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}
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get_root_pool()
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{
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set -- $(mount | grep ' on / ')
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[ "$5" = "zfs" ] && echo "${1%%/*}"
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}
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# Check if a variable is 'yes' (any case) or '1'
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# Returns TRUE if set.
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check_boolean()
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{
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local var="$1"
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echo "$var" | grep -Eiq "^yes$|^on$|^true$|^1$" && return 0 || return 1
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}
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check_module_loaded()
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{
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module="$1"
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[ -r "/sys/module/${module}/version" ] && return 0 || return 1
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}
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load_module()
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{
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module="$1"
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# Load the zfs module stack
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if ! check_module_loaded "$module"; then
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if ! /sbin/modprobe "$module"; then
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return 5
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fi
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fi
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return 0
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}
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# first parameter is a regular expression that filters mtab
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read_mtab()
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{
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local match="$1"
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local fs mntpnt fstype opts rest TMPFILE
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# Unset all MTAB_* variables
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unset $(env | grep ^MTAB_ | sed 's,=.*,,')
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while read -r fs mntpnt fstype opts rest; do
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if echo "$fs $mntpnt $fstype $opts" | grep -qE "$match"; then
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# * Fix problems (!?) in the mounts file. It will record
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# 'rpool 1' as 'rpool\0401' instead of 'rpool\00401'
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# which seems to be the correct (at least as far as
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# 'printf' is concerned).
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# * We need to use the external echo, because the
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# internal one would interpret the backslash code
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# (incorrectly), giving us a instead.
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mntpnt=$(/bin/echo "$mntpnt" | sed "s,\\\0,\\\00,g")
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fs=$(/bin/echo "$fs" | sed "s,\\\0,\\\00,")
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# Remove 'unwanted' characters.
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mntpnt=$(printf '%b\n' "$mntpnt" | sed -e 's,/,,g' \
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-e 's,-,,g' -e 's,\.,,g' -e 's, ,,g')
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fs=$(printf '%b\n' "$fs")
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# Set the variable.
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eval export MTAB_$mntpnt=\"$fs\"
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fi
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done < /proc/self/mounts
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}
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in_mtab()
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{
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local mntpnt="$1"
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# Remove 'unwanted' characters.
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mntpnt=$(printf '%b\n' "$mntpnt" | sed -e 's,/,,g' \
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-e 's,-,,g' -e 's,\.,,g' -e 's, ,,g')
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local var
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var="$(eval echo MTAB_$mntpnt)"
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[ "$(eval echo "$""$var")" != "" ]
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return "$?"
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}
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# first parameter is a regular expression that filters fstab
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read_fstab()
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{
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local match="$1"
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local i var TMPFILE
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# Unset all FSTAB_* variables
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unset $(env | grep ^FSTAB_ | sed 's,=.*,,')
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i=0
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while read -r fs mntpnt fstype opts; do
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echo "$fs" | egrep -qE '^#|^$' && continue
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echo "$mntpnt" | egrep -qE '^none|^swap' && continue
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echo "$fstype" | egrep -qE '^swap' && continue
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if echo "$fs $mntpnt $fstype $opts" | grep -qE "$match"; then
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eval export FSTAB_dev_$i="$fs"
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fs=$(printf '%b\n' "$fs" | sed 's,/,_,g')
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eval export FSTAB_$i="$mntpnt"
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i=$((i + 1))
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fi
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done < /etc/fstab
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}
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in_fstab()
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{
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local var
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var="$(eval echo FSTAB_$1)"
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[ "${var}" != "" ]
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return $?
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}
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is_mounted()
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{
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local mntpt="$1"
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local line
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mount | \
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while read line; do
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if echo "$line" | grep -q " on $mntpt "; then
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# returns:
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# 0 on unsuccessful match
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# 1 on a successful match
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return 1
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fi
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done
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# The negation will flip the subshell return result where the default
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# return value is 0 when a match is not found.
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return $(( !$? ))
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}
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