[PATCH 15/17] grub-btrfs: New package

[Stefan Schantl <stefan.schantl@ipfire.org>]

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This kind of grub addon will extend the grub boot menu by a additional
submenu where a BTRFS snapshot can be selected to directly use as root
volume and boot into it.

The grub-btrfsd daemon is using inotify(tools) to watch the snapshot directory for
new or deleted snapshots and calls grub-mkconfig to adjust the snapshot grub submenu

Signed-off-by: Stefan Schantl <stefan.schantl(a)ipfire.org>
---
 config/rootfiles/common/grub-btrfs         | 14 ++++
 config/rootfiles/common/x86_64/initscripts |  4 ++
 lfs/grub-btrfs                             | 79 ++++++++++++++++++++++
 lfs/initscripts                            |  3 +
 make.sh                                    |  1 +
 src/initscripts/system/grub-btrfsd         | 61 +++++++++++++++++
 6 files changed, 162 insertions(+)
 create mode 100644 config/rootfiles/common/grub-btrfs
 create mode 100644 lfs/grub-btrfs
 create mode 100644 src/initscripts/system/grub-btrfsd

diff --git a/config/rootfiles/common/grub-btrfs b/config/rootfiles/common/grub-btrfs
new file mode 100644
index 000000000..a612af065
--- /dev/null
+++ b/config/rootfiles/common/grub-btrfs
@@ -0,0 +1,14 @@
+boot/grub/grubenv
+etc/default/grub-btrfs
+etc/default/grub-btrfs/config
+etc/grub.d/41_snapshots-btrfs
+usr/bin/grub-btrfsd
+#usr/lib/systemd/system/grub-btrfsd.service
+#usr/share/doc/grub-btrfs
+#usr/share/doc/grub-btrfs/README.md
+#usr/share/doc/grub-btrfs/initramfs-overlayfs.md
+#usr/share/licenses
+#usr/share/licenses/grub-btrfs
+#usr/share/licenses/grub-btrfs/LICENSE
+#usr/share/man/man8/grub-btrfs.8.bz2
+#usr/share/man/man8/grub-btrfsd.8.bz2
diff --git a/config/rootfiles/common/x86_64/initscripts b/config/rootfiles/common/x86_64/initscripts
index a5e1596fb..2d6fa85dc 100644
--- a/config/rootfiles/common/x86_64/initscripts
+++ b/config/rootfiles/common/x86_64/initscripts
@@ -26,6 +26,7 @@ etc/rc.d/init.d/firewall
 etc/rc.d/init.d/firstsetup
 etc/rc.d/init.d/fsresize
 etc/rc.d/init.d/functions
+etc/rc.d/init.d/grub-btrfsd
 etc/rc.d/init.d/halt
 etc/rc.d/init.d/ipsec
 etc/rc.d/init.d/leds
@@ -92,6 +93,7 @@ etc/rc.d/init.d/vnstat
 etc/rc.d/init.d/waitdrives
 etc/rc.d/init.d/wlanclient
 #etc/rc.d/rc0.d
+etc/rc.d/rc0.d/K01grub-btrfsd
 #etc/rc.d/rc0.d/K01imspetor
 #etc/rc.d/rc0.d/K01motion
 #etc/rc.d/rc0.d/K01vdradmin
@@ -135,10 +137,12 @@ etc/rc.d/rc3.d/S32apache
 etc/rc.d/rc3.d/S40fcron
 etc/rc.d/rc3.d/S98rc.local
 #etc/rc.d/rc3.d/S98sslh
+etc/rc.d/rc3.d/S99grub-btrfsd
 #etc/rc.d/rc3.d/S99imspetor
 #etc/rc.d/rc3.d/S99motion
 #etc/rc.d/rc3.d/S99vdradmin
 #etc/rc.d/rc6.d
+etc/rc.d/rc6.d/K01grub-btrfsd
 #etc/rc.d/rc6.d/K01imspetor
 #etc/rc.d/rc6.d/K01motion
 #etc/rc.d/rc6.d/K01vdradmin
diff --git a/lfs/grub-btrfs b/lfs/grub-btrfs
new file mode 100644
index 000000000..8dc0c4f3e
--- /dev/null
+++ b/lfs/grub-btrfs
@@ -0,0 +1,79 @@
+###############################################################################
+#                                                                             #
+# IPFire.org - A linux based firewall                                         #
+# Copyright (C) 2007-2023  IPFire Team  <info(a)ipfire.org>                     #
+#                                                                             #
+# This program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# This program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
+#                                                                             #
+###############################################################################
+
+###############################################################################
+# Definitions
+###############################################################################
+
+include Config
+
+VER        = 4.13
+
+THISAPP    = grub-btrfs-$(VER)
+DL_FILE    = $(THISAPP).tar.gz
+DL_FROM    = $(URL_IPFIRE)
+DIR_APP    = $(DIR_SRC)/$(THISAPP)
+TARGET     = $(DIR_INFO)/$(THISAPP)
+
+###############################################################################
+# Top-level Rules
+###############################################################################
+
+objects = $(DL_FILE)
+
+$(DL_FILE) = $(DL_FROM)/$(DL_FILE)
+
+$(DL_FILE)_BLAKE2 = e2f11a0a8282e3ec8ff8223e3bad70b5d5c5e81b4d740a1bf3554db412dbe48a8a0f216f4e6c65ae1d11c01a27b8b92bae9b470c60d2389505ce089511536e1a
+
+install : $(TARGET)
+
+check : $(patsubst %,$(DIR_CHK)/%,$(objects))
+
+download :$(patsubst %,$(DIR_DL)/%,$(objects))
+
+b2 : $(subst %,%_BLAKE2,$(objects))
+
+dist:
+	@$(PAK)
+
+###############################################################################
+# Downloading, checking, b2sum
+###############################################################################
+
+$(patsubst %,$(DIR_CHK)/%,$(objects)) :
+	@$(CHECK)
+
+$(patsubst %,$(DIR_DL)/%,$(objects)) :
+	@$(LOAD)
+
+$(subst %,%_BLAKE2,$(objects)) :
+	@$(B2SUM)
+
+###############################################################################
+# Installation Details
+###############################################################################
+
+$(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
+	@$(PREBUILD)
+	@rm -rf $(DIR_APP) && cd $(DIR_SRC) && tar axf $(DIR_DL)/$(DL_FILE)
+	$(UPDATE_AUTOMAKE)
+	cd $(DIR_APP) && make install
+	@rm -rf $(DIR_APP)
+	@$(POSTBUILD)
diff --git a/lfs/initscripts b/lfs/initscripts
index e078632ab..4d67ee0c4 100644
--- a/lfs/initscripts
+++ b/lfs/initscripts
@@ -91,6 +91,7 @@ $(TARGET) :
 		install -v -m 755 $$i /etc/rc.d/helper/; \
 	done
 
+	ln -sf ../init.d/grub-btrfsd		/etc/rc.d/rc0.d/K01grub-btrfsd
 	ln -sf ../init.d/imspetor		/etc/rc.d/rc0.d/K01imspetor
 	ln -sf ../init.d/motion			/etc/rc.d/rc0.d/K01motion
 	ln -sf ../init.d/vdradmin		/etc/rc.d/rc0.d/K01vdradmin
@@ -132,10 +133,12 @@ $(TARGET) :
 	ln -sf ../init.d/fcron			/etc/rc.d/rc3.d/S40fcron
 	ln -sf ../../sysconfig/rc.local		/etc/rc.d/rc3.d/S98rc.local
 	ln -sf ../init.d/sslh			/etc/rc.d/rc3.d/S98sslh
+	ln -sf ../init.d/grub-btrfsd		/etc/rc.d/rc3.d/S99grub-btrfsd
 	ln -sf ../init.d/imspetor		/etc/rc.d/rc3.d/S99imspetor
 	ln -sf ../init.d/motion			/etc/rc.d/rc3.d/S99motion
 	ln -sf ../init.d/vdradmin		/etc/rc.d/rc3.d/S99vdradmin
 
+	ln -sf ../init.d/grub-btrfsd		/etc/rc.d/rc6.d/K01grub-btrfsd
 	ln -sf ../init.d/imspetor		/etc/rc.d/rc6.d/K01imspetor
 	ln -sf ../init.d/motion			/etc/rc.d/rc6.d/K01motion
 	ln -sf ../init.d/vdradmin		/etc/rc.d/rc6.d/K01vdradmin
diff --git a/make.sh b/make.sh
index 30bd5f16b..0aa3d26af 100755
--- a/make.sh
+++ b/make.sh
@@ -1713,6 +1713,7 @@ buildipfire() {
   lfsmake2 mympd
   lfsmake2 btrfs-progs
   lfsmake2 inotify-tools
+  lfsmake2 grub-btrfs
 
   # Kernelbuild ... current we have no platform that need
   # multi kernel builds so KCFG is empty
diff --git a/src/initscripts/system/grub-btrfsd b/src/initscripts/system/grub-btrfsd
new file mode 100644
index 000000000..833f90cb1
--- /dev/null
+++ b/src/initscripts/system/grub-btrfsd
@@ -0,0 +1,61 @@
+#!/bin/sh
+###############################################################################
+#                                                                             #
+# IPFire.org - A linux based firewall                                         #
+# Copyright (C) 2007-2024  IPFire Team  <info(a)ipfire.org>                     #
+#                                                                             #
+# This program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# This program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
+#                                                                             #
+###############################################################################
+
+. /etc/sysconfig/rc
+. ${rc_functions}
+
+SNAPSHOTDIR="/.snapshots"
+PIDFILE="/run/grub-btrfsd.pid"
+
+root_is_btrfs() {
+    [ "$(stat -f --format="%T" /)" == "btrfs" ] || return 1
+
+    return 0
+}
+
+case "$1" in
+        start)
+		root_is_btrfs || exit 0
+
+		boot_mesg "Starting grub-btrfsd..."
+		loadproc -b -p "$PIDFILE" /usr/bin/grub-btrfsd --syslog "$SNAPSHOTDIR"
+
+		# Store the gained PID to the defined pidfile
+		echo "$!" > "$PIDFILE"
+	;;
+
+	stop)
+		boot_mesg "Stopping grub-btrfsd..."
+		killproc -p "$PIDFILE" /usr/bin/grub-btrfsd
+		sleep 1;
+	;;
+
+	restart)
+		$0 stop
+		sleep 2
+		$0 start
+	;;
+
+	*)
+		echo "Usage: $0 {start|stop|restart}"
+		exit 1
+	;;
+esac
-- 
2.39.2