Base init scripts for SYSV systems

* Based on the init scripts included with Debian GNU/Linux, then take code from the
  already existing ones, trying to merge them into one for better maintainability.
  + Merge openzfs#2148 - Inform OpenRC that ZFS uses mtab.
  + 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. Include /dev as a last ditch attempt.
  + Fallback on importing the pool using the cache file (if it exists) if the
    'by-id' didn't work.
  + Add exceptions to pool imports.
  + ZED script from the Debian GNU/Linux packages added.
  + Run all scripts through ShellCheck.

Signed-off-by: Turbo Fredriksson [email protected]
Closes: openzfs#2974, openzfs#2107.

config/zfs-build.m4

@@ -139,7 +139,7 @@ AC_DEFUN([ZFS_AC_RPM], [
 	])
 
 	RPM_DEFINE_COMMON='--define "$(DEBUG_ZFS) 1" --define "$(DEBUG_DMU_TX) 1"'
-	RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)" --define "_udevdir $(udevdir)" --define "_udevruledir $(udevruledir)"'
+	RPM_DEFINE_UTIL='--define "_dracutdir $(dracutdir)" --define "_udevdir $(udevdir)" --define "_udevruledir $(udevruledir)" --define "_initconfdir $(DEFAULT_INITCONF_DIR)"'
 	RPM_DEFINE_KMOD='--define "kernels $(LINUX_VERSION)" --define "require_spldir $(SPL)" --define "require_splobj $(SPL_OBJ)" --define "ksrc $(LINUX)" --define "kobj $(LINUX_OBJ)"'
 	RPM_DEFINE_DKMS=
 
@@ -311,6 +311,20 @@ AC_DEFUN([ZFS_AC_DEFAULT_PACKAGE], [
 
 	AC_MSG_RESULT([$DEFAULT_INIT_SCRIPT])
 	AC_SUBST(DEFAULT_INIT_SCRIPT)
+
+	AC_MSG_CHECKING([default init config direectory])
+	case "$VENDOR" in
+		toss)       DEFAULT_INITCONF_DIR=/etc/sysconfig ;;
+		redhat)     DEFAULT_INITCONF_DIR=/etc/sysconfig ;;
+		fedora)     DEFAULT_INITCONF_DIR=/etc/sysconfig ;;
+		sles)       DEFAULT_INITCONF_DIR=/etc/sysconfig ;;
+		ubuntu)     DEFAULT_INITCONF_DIR=/etc/default   ;;
+		debian)     DEFAULT_INITCONF_DIR=/etc/default   ;;
+		*)          DEFAULT_INITCONF_DIR=/etc/default   ;;
+	esac
+
+	AC_MSG_RESULT([$DEFAULT_INITCONF_DIR])
+	AC_SUBST(DEFAULT_INITCONF_DIR)
 ])
 
 dnl #

etc/init.d/.gitignore

@@ -1 +1,6 @@
+common.init
+zfs-import
+zfs-mount
+zfs-share
+zfs-zed
 zfs

etc/init.d/Makefile.am

@@ -1,22 +1,38 @@
 initdir = $(DEFAULT_INIT_DIR)
-init_SCRIPTS = zfs
+init_SCRIPTS = zfs-import zfs-mount zfs-share zfs-zed
+
+initcommondir = $(sysconfdir)/zfs
+initcommon_SCRIPTS = common.init
+
+initconfdir = $(DEFAULT_INITCONF_DIR)
+initconf_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
+	$(top_srcdir)/etc/init.d/common.init.in \
+	$(top_srcdir)/etc/init.d/zfs-share.in \
+	$(top_srcdir)/etc/init.d/zfs-import.in \
+	$(top_srcdir)/etc/init.d/zfs-mount.in \
+	$(top_srcdir)/etc/init.d/zfs-zed.in \
+	$(top_srcdir)/etc/init.d/zfs.in
 
-$(init_SCRIPTS): $(init_SCRIPTS).$(DEFAULT_INIT_SCRIPT).in
-	-$(SED) -e 's,@bindir\@,$(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\@,$(initdir),g' \
-		-e 's,@runstatedir\@,$(runstatedir),g' \
-		'$@.$(DEFAULT_INIT_SCRIPT).in' >'$@'
+$(init_SCRIPTS) $(initconf_SCRIPTS) $(initcommon_SCRIPTS):
+	-(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,@initconfdir\@,$(initconfdir),g' \
+		 -e 's,@initdir\@,$(initdir),g' \
+		 -e 's,@runstatedir\@,$(runstatedir),g' \
+		 -e "s,@NFS_SRV\@,$$NFS_SRV,g" \
+		 '[email protected]' >'$@'; \
+	  [ '$@' = 'common.init' -o '$@' = 'zfs' ] || \
+		chmod +x '$@')
 
 distclean-local::
-	-$(RM) $(init_SCRIPTS)
+	-$(RM) $(init_SCRIPTS) $(initcommon_SCRIPTS) $(initconf_SCRIPTS)

etc/init.d/README.md

@@ -0,0 +1,48 @@
+DESCRIPTION
+  These script was written with the primary intention to be portable and
+  usable on as many systems as possible.
+
+  This is, in practice, usually not possible. But the intention is there.
+  And it is a good one.
+
+  It have been tested successfully on:
+
+    * Debian GNU/Linux Wheezy
+    * Debian GNU/Linux Jessie
+    * Ubuntu Trusty
+    * CentOS 6.0
+    * CentOS 6.6
+    * Gentoo
+
+SUPPORT
+  If you find that they don't work for your platform, please report this
+  at the ZFS On Linux issue tracker at https://github.com/zfsonlinux/zfs/issues.
+
+  Please include:
+
+    * Distribution name
+    * Distribution version
+    * Where to find a install CD image
+    * Architecture
+
+  If you have code to share that fixes the problem, that is much better.
+  But please remember to try your best to think 'portability'. If you
+  suspect that what you're writing/modifying won't work on anything else
+  than your distribution, please make sure to put that code in appropriate
+  if/else/fi code.
+
+  It currently MUST be bash (or fully compatible) for this to work.
+
+  If you're making your own distribution and you want the scripts to
+  work on that, the biggest problem you'll (proably) have is the part
+  at the beginning of the "common.init.in" file which sets up the
+  logging output.
+
+INSTALLING INIT SCRIPT LINKS
+  To setup the init script links in /etc/rc?.d manually on a Debian GNU/Linux
+  (or derived) system, run the following commands (the order is important!):
+
+    update-rc.d zfs-zed    start 18 S .       stop 08 0 1 6 .
+    update-rc.d zfs-import start 11 S .       stop 07 0 1 6 .
+    update-rc.d zfs-mount  start 02 2 3 4 5 . stop 06 0 1 6 .
+    update-rc.d zfs-share  start 03 2 3 4 5 . stop 05 0 1 6 .