contrib/initramfs: switch to automake

Use automake to build initramfs scripts and hooks.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: loli10K <ezomori.nozomu@gmail.com>
Closes #6761

contrib/initramfs/scripts/.gitignore

@@ -0,0 +1 @@
+zfs

contrib/initramfs/scripts/Makefile.am

@@ -0,0 +1,20 @@
+scriptsdir = $(datarootdir)/initramfs-tools/scripts
+
+scripts_SCRIPTS = \
+	zfs
+
+SUBDIRS = local-top
+
+EXTRA_DIST = \
+	$(top_srcdir)/contrib/initramfs/scripts/zfs.in
+
+$(scripts_SCRIPTS):%:%.in
+	-$(SED) -e 's,@sbindir\@,$(sbindir),g' \
+		-e 's,@sysconfdir\@,$(sysconfdir),g' \
+		$< >'$@'
+
+clean-local::
+	-$(RM) $(scripts_SCRIPTS)
+
+distclean-local::
+	-$(RM) $(scripts_SCRIPTS)

contrib/initramfs/scripts/local-top/Makefile.am

@@ -0,0 +1,3 @@
+localtopdir = $(datarootdir)/initramfs-tools/scripts/local-top
+
+EXTRA_DIST = zfs

contrib/initramfs/scripts/zfs.in

@@ -11,9 +11,9 @@
 
 # Paths to what we need - in the initrd, these paths are hardcoded,
 # so override the defines in zfs-functions.
-ZFS="/sbin/zfs"
-ZPOOL="/sbin/zpool"
-ZPOOL_CACHE="/etc/zfs/zpool.cache"
+ZFS="@sbindir@/zfs"
+ZPOOL="@sbindir@/zpool"
+ZPOOL_CACHE="@sysconfdir@/zfs/zpool.cache"
 export ZFS ZPOOL ZPOOL_CACHE
 
 # This runs any scripts that should run before we start importing
@@ -610,7 +610,7 @@ setup_snapshot_booting()
 	# Separate the full snapshot ('$snap') into it's filesystem and
 	# snapshot names. Would have been nice with a split() function..
 	rootfs="${snap%%@*}"
-	snapname="${snap##*@}"	
+	snapname="${snap##*@}"
 	ZFS_BOOTFS="${rootfs}_${snapname}"
 
 	if ! grep -qiE '(^|[^\\](\\\\)* )(rollback)=(on|yes|1)( |$)' /proc/cmdline