systemd: Implement the /cfg mount in a generic manner
Our previous method sucked a bit because it relied on hardcoded,
board-specific partition names. It also bypassed systemd's mount
management and used a direct call to mount(1) instead.
So I asked on the systemd mailing list and got an advice to use systemd
generators.
NOTE: Ensure that your build and target trees have been cleared, the
previously-installed cfg-storage.service breaks this one.
Kudos for the sed magic to [1].
[1] https://stackoverflow.com/a/22550640/2245623
Change-Id: I269ce040b2d8ce88083ae0bb667ac12b7a0ee72e
diff --git a/board/czechlight/common/overlay/usr/lib/systemd/system/cfg-restore-etc.service b/board/czechlight/common/overlay/usr/lib/systemd/system/cfg-restore-etc.service
index 0540bc9..6e4514e 100644
--- a/board/czechlight/common/overlay/usr/lib/systemd/system/cfg-restore-etc.service
+++ b/board/czechlight/common/overlay/usr/lib/systemd/system/cfg-restore-etc.service
@@ -3,8 +3,8 @@
DefaultDependencies=no
Conflicts=umount.target
Before=local-fs.target umount.target
-After=cfg-storage.service
-Requires=cfg-storage.service etc-overlay.service
+After=cfg.mount
+Requires=cfg.mount etc-overlay.service
ConditionDirectoryNotEmpty=/cfg/etc
[Service]