Base scripts on the init scripts included with Debian GNU/Linux

then take code from the already existing ones, trying to merge
them into one.
+ NFS server service is just called 'nfs' in Redhat based system, and
  nfs-kernel-server on Debian GNU/Linux based.
+ Merge openzfs#2148 - Inform OpenRC that ZFS uses mtab.
+ Stop after umountfs
+ When stopping, don't check for LOCKDIR/zfs-mount - it won't be mounted,
  so the file won't exist making the script not run.
+ Add a configurable ZFS_INITRD_POST_MODPROBE_SLEEP used in the initrd to sleep after the modprobe.
+ The import function, do_import(), imports pools by name instead of '-a' [all].
  + Test all '/dev/disk/by-*' dirs for import.
+ Fallback on importing the pool using the cache file (if it exists) if the
  'by-id' didn't work.
+ Add exceptions to pool imports.

etc/init.d/.gitignore

@@ -1 +1,2 @@
 zfs
+zfs-common

etc/init.d/Makefile.am

@@ -1,21 +1,20 @@
 initdir = $(DEFAULT_INIT_DIR)
-init_SCRIPTS = zfs
-
-EXTRA_DIST = \
-	$(top_srcdir)/etc/init.d/zfs.fedora.in \
-	$(top_srcdir)/etc/init.d/zfs.gentoo.in \
-	$(top_srcdir)/etc/init.d/zfs.lsb.in \
-	$(top_srcdir)/etc/init.d/zfs.lunar.in \
-	$(top_srcdir)/etc/init.d/zfs.redhat.in
+init_SCRIPTS = zfs-common zfs-mount zfs-share
 
 $(init_SCRIPTS):
-	-$(SED) -e 's,@bindir\@,$(bindir),g' \
+	-(if [ -e /etc/debian_version ]; then \
+		NFS_SRV=nfs-kernel-server; \
+	  else \
+		NFS_SRV=nfs; \
+	  fi; \
+	  $(SED) -e 's,@bindir\@,$(bindir),g' \
 		-e 's,@sbindir\@,$(sbindir),g' \
 		-e 's,@udevdir\@,$(udevdir),g' \
 		-e 's,@udevruledir\@,$(udevruledir),g' \
 		-e 's,@sysconfdir\@,$(sysconfdir),g' \
 		-e 's,@initdir\@,$(initdir),g' \
-		'$@.$(DEFAULT_INIT_SCRIPT).in' >'$@'
+		-e "s,@NFS_SRV\@,$$NFS_SRV,g" \
+		'[email protected]' >'$@')
 
 distclean-local::
 	-$(RM) $(init_SCRIPTS)

etc/init.d/default

@@ -0,0 +1,69 @@
+# ZoL userland configuration.
+
+# Run `zfs mount -a` during system start?
+# This should be 'no' if zfs-mountall or a systemd generator
+# is available.
+ZFS_MOUNT='yes'
+
+# Run `zfs unmount -a` during system stop?
+# This should be 'no' on most systems.
+ZFS_UNMOUNT='yes'
+
+# Run `zfs share -a` during system start?
+# nb: The shareiscsi, sharenfs, and sharesmb dataset properties.
+ZFS_SHARE='yes'
+
+# Run `zfs unshare -a` during system stop?
+ZFS_UNSHARE='yes'
+
+# Sould we use '-d /dev/disk/by-*' when importing pool.
+# This is recomended, but the default 'no' uses the cache
+# file.
+# Variable is somewhat missleading. Previously the code
+# tried _only_ '/dev/disk/by-id', but will now try any
+# '/dev/disk/by-*' directory.
+USE_DISK_BY_ID='yes'
+
+# Should the datasets be mounted verbosly (a mount counter
+# will be used when mounting if set to 'yes').
+VERBOSE_MOUNT='no'
+
+# Should we allow overlay mounts (this is standard in Linux,
+# but not ZFS which comes from Solaris where this is not allowed).
+DO_OVERLAY_MOUNTS='no'
+
+# Any additional option to the 'zfs mount' command line.
+# Include '-o' for each option wanted.
+MOUNT_EXTRA_OPTIONS=""
+
+# Build kernel modules with the --enable-debug switch?
+ZFS_DKMS_ENABLE_DEBUG='no'
+
+# Build kernel modules with the --enable-debug-dmu-tx switch?
+ZFS_DKMS_ENABLE_DEBUG_DMU_TX='no'
+
+# Keep debugging symbols in kernel modules?
+ZFS_DKMS_DISABLE_STRIP='no'
+
+# Wait for this many seconds in the initrd pre_mountroot?
+# This delays startup and should be '0' on most systems.
+ZFS_INITRD_PRE_MOUNTROOT_SLEEP='0'
+
+# Wait for this many seconds in the initrd mountroot?
+# This delays startup and should be '0' on most systems.
+# This might help on systems which have their ZFS root on
+# a USB disk that takes just a little longer to be available
+ZFS_INITRD_POST_MODPROBE_SLEEP='0'
+
+# List of additional datasets to mount after the root                    
+# dataset is mounted.
+# The init script will use the mountpoint specified in
+# the 'mountpoint' property value in the dataset to
+# determine where it should be mounted.
+#ZFS_INITRD_ADDITIONAL_DATASETS="rpool/ROOT/usr_local"
+
+# List of pools that should NOT be imported at boot
+#ZFS_POOL_EXCEPTIONS="test2"
+
+# Location of the lockfile.
+LOCKDIR=/run/lock

etc/init.d/zfs-common.in

@@ -0,0 +1,240 @@
+# This is a script with common functions etc used by zfs-mount and zfs-share.
+#
+# It is _NOT_ to be called independently
+
+PATH=/sbin:/bin:/usr/bin:/usr/sbin
+
+# Source function library
+if [ -f /lib/lsb/init-functions ]; then
+	. /lib/lsb/init-functions
+elif [ -f /etc/rc.d/init.d/functions ]; then
+	. /etc/rc.d/init.d/functions
+fi
+
+# Of course the functions we need is called differently
+# on different distributions - it would be way to easy
+# otherwise!!
+if type log_failure_msg > /dev/null ; then
+	# LSB functions
+	log_begin_msg=log_begin_msg
+	log_failure_msg=log_failure_msg
+	log_progress_msg=log_progress_msg
+elif type success > /dev/null ; then
+	# Fedora/RedHat functions
+	log_begin_msg=success
+	log_failure_msg=failure
+	log_progress_msg=echo -n
+elif type einfo > /dev/null ; then
+	# Gentoo functions
+	log_begin_msg=einfo
+	log_failure_msg=eerror
+	log_progress_msg=echo -n
+else
+	log_begin_msg=echo -n
+	log_failure_msg=echo
+	log_progress_msg=echo -n
+fi
+
+# The log_end_msg is a little different - it's both an
+# echo of a failed message and a return of a code number.
+# So if it doesn't exist, we define a very simple one
+# that would do the work.
+if ! type log_end_msg > /dev/null ; then
+	log_end_msg() {
+		ret=$1
+		if [ "$ret" -ge 1 ]; then
+			echo " failed!"
+		else
+			echo " success"
+		fi
+		return $ret
+	}
+fi
+log_end_msg=log_end_msg
+
+# Paths to what we need
+ZFS="@sbindir@/zfs"
+ZPOOL="@sbindir@/zpool"
+ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
+
+# Sencible defaults
+ZFS_MOUNT='yes'
+ZFS_UNMOUNT='yes'
+LOCKDIR=/var/lock/zfs
+
+# Source zfs configuration, overriding the defaults
+if [ -f /etc/default/zfs ]; then
+	. /etc/default/zfs
+elif [ -f /etc/sysconfig/zfs ]; then
+	. /etc/sysconfig/zfs
+fi
+
+[ ! -d "$LOCKDIR" ] && mkdir $LOCKDIR
+
+# ----------------------------------------------------
+
+zfs_installed() {
+	$log_begin_msg "Checking if zfs userspace tools present"
+	if [ ! -x $ZPOOL ]; then
+		$log_failure_msg "$ZPOOL binary not found."
+		$log_end_msg 1
+	fi
+	if [ ! -x $ZFS ]; then
+		$log_failure_msg "$ZFS binary not found."
+		$log_end_msg 1
+	fi
+	$log_end_msg 0
+}
+
+# Do a lot of checks to make sure it's 'safe' to continue with import/mount etc
+checksystem()
+{
+	if [ -z "$init" ]; then
+		# Not interactive
+		grep -qiE '(^|[^\\](\\\\)* )zfs=(off|no)( |$)' /proc/cmdline && exit 3
+	fi
+
+	[ -f "$LOCKDIR/$servicename" ] && return 3
+
+	# Check if ZFS is installed.  If not, comply to FC standards and bail
+	zfs_installed || {
+		$log_failure_msg "not installed"
+		return 5
+	}
+
+	# Requires selinux policy which has not been written.
+	if [ -r "/selinux/enforce" ] &&
+	   [ "$(cat /selinux/enforce)" == "1" ]; then
+
+		$log_failure_msg "SELinux ZFS policy required"
+		return 4
+	fi
+
+	# Delay until all required block devices are present.
+	if [ -x /sbin/udevadm ]; then
+		/sbin/udevadm settle
+	elif [ -x /sbin/udevsettle ]; then
+		/sbin/udevsettle
+	fi
+
+	# Load the zfs module stack
+	if ! grep -q zfs /proc/modules ; then
+		$log_begin_msg "Loading kernel ZFS infrastructure: "
+		modprobe zfs || {
+			$log_failure_msg "Could not load zfs module"
+			$log_end_msg 1
+			return 5
+		}
+		$log_end_msg 0
+	fi
+	sleep 1
+
+	# fix mtab to include already-mounted fs filesystems, in case there are any
+	# we ONLY do this if mtab does not point to /proc/mounts
+	# which is the case in some systems (systemd may bring that soon)
+	if ! readlink /etc/mtab | grep -q /proc ; then
+		if grep -qE "(^/dev/zd|^/dev/zvol| zfs )" /proc/mounts ; then
+			$log_begin_msg "Registering already-mounted ZFS filesystems and volumes: "
+			reregister_mounts || {
+				$log_end_msg 1
+				return 150
+			}
+		fi
+	fi
+
+	# Ensure / exists in /etc/mtab, if not update mtab accordingly.
+	# This should be handled by rc.sysinit but lets be paranoid.
+	awk '$2 == "/" { exit 1 }' /etc/mtab
+	RETVAL=$?
+	if [ "$RETVAL" -eq 0 ]; then
+		/bin/mount -f /
+	fi
+
+	if ! [ `uname -m` == "x86_64" ]; then
+		echo "Warning: You're not running 64bit. Currently native zfs in";
+		echo "         linux is only supported and tested on 64bit.";
+		# should we break here? People doing this should know what they
+		# do, thus i'm not breaking here.
+	fi
+}
+
+depend()
+{
+	# Try to allow people to mix and match fstab with ZFS in a way that makes sense.
+	if [ "$(mountinfo -s /)" == 'zfs' ]; then
+		before localmount
+	else
+		after localmount
+	fi
+
+	# bootmisc will log to /var which may be a different zfs than root.
+	before bootmisc logger
+	use mtab
+	keyword -lxc -openvz -prefix -vserver
+}
+
+reregister_mounts() {
+	cat /etc/mtab | while read -r fs mntpnt fstype opts rest ; do
+		fs=`printf '%b\n' "$fs"`
+		mntpnt=`printf '%b\n' "$mntpnt"`
+		if [ "$fstype" == "zfs" ] ; then
+			if [ "$mntpnt" == "/" ] ; then
+				mount -f -o zfsutil -t zfs --move / /removethismountpointhoweverpossible
+				umount --fake /removethismountpointhoweverpossible
+			else
+				umount --fake "$mntpnt"
+			fi
+		elif echo "$fs" | grep -qE "^/dev/(zd|zvol)" ; then
+			if [ "$mntpnt" == "/" ] ; then
+				mount -f -t "$fstype" --move / /removethismountpointhoweverpossible
+				umount --fake /removethismountpointhoweverpossible
+			else
+				umount --fake "$mntpnt"
+			fi
+		fi
+	done
+	cat /proc/mounts | while read -r fs mntpnt fstype opts rest ; do
+		fs=`printf '%b\n' "$fs"`
+		mntpnt=`printf '%b\n' "$mntpnt"`
+		if [ "$fstype" == "zfs" ] ; then
+			mount -f -t zfs -o zfsutil "$fs" "$mntpnt"
+		elif echo "$fs" | grep -q "^/dev/zd" ; then
+			mount -f -t "$fstype" -o "$opts" "$fs" "$mntpnt"
+		fi
+	done
+}
+
+# i need a bash guru to simplify this, since this is copy and paste, but donno how
+# to correctly dereference variable names in bash, or how to do this right
+
+declare -A MTAB
+declare -A FSTAB
+
+# first parameter is a regular expression that filters mtab
+read_mtab() {
+        for fs in "${!MTAB[@]}" ; do unset MTAB["$fs"] ; done
+        while read -r fs mntpnt fstype opts blah ; do
+                fs=`printf '%b\n' "$fs"`
+                MTAB["$fs"]=$mntpnt
+        done < <(grep -E "$1" /etc/mtab)
+}
+
+in_mtab() {
+        [ "${MTAB[$1]}" != "" ]
+        return $?
+}
+
+# first parameter is a regular expression that filters fstab
+read_fstab() {
+        for fs in "${!FSTAB[@]}" ; do unset FSTAB["$fs"] ; done
+        while read -r fs mntpnt fstype opts blah ; do
+                fs=`printf '%b\n' "$fs"`
+                FSTAB["$fs"]=$mntpnt
+        done < <(grep -E "$1" /etc/fstab)
+}
+
+in_fstab() {
+        [ "${FSTAB[$1]}" != "" ]
+        return $?
+}
+