[Buildroot] [PATCH 1/6 v3] package/skeleton-systemd: move /var factory tmpfiles out of /etc

[yann.morin at orange.com]

When the rootfs is not remounted read-write (thus assuming a read-only
rootfs like squashfs), we create a tmpfiles.d factory for /var.

However, we register those in /etc/tmpfiles.d/, but /etc could also be
a tmpfs (for full state-less systems, or easy factory-reset, see [0]).

So, we move our var factory to /usr/lib/tmpfiles.d/, which is also the
location where systemd itself places its own tmpfiles, and where we
already put all our other tmpfiles (see audit, avahi, cryptsetup, dhcp,
lighttpd, nfs-utils, quagga, samba4, swupdate) and our handling of
systemd's catalog files too. We also rename the file to a better name,
so that it is obvious it is generated by us (systemd already installs a
var.conf of its own, so we want to avoid name clashing).

Last little detail: there is no need or reason to create .../tmpfiles.d/
at install time; it is only needed in the rootfs-pre-cmd hook, so we
only create it just before we need it.

[0] http://0pointer.de/blog/projects/stateless.html

Signed-off-by: Yann E. MORIN <yann.morin at orange.com>
Cc: Norbert Lange <nolange79 at gmail.com>
Cc: Romain Naour <romain.naour at smile.fr>
Cc: Jérémy Rosen <jeremy.rosen at smile.fr>
[yann.morin.1998 at free.fr:
  - split original patch in two
  - this one only moves out of /etc and into /usr/lib
  - adapt commit log accordingly
]
Signed-off-by: Yann E. MORIN <yann.morin.1998 at free.fr>
---
 package/skeleton-init-systemd/skeleton-init-systemd.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/package/skeleton-init-systemd/skeleton-init-systemd.mk b/package/skeleton-init-systemd/skeleton-init-systemd.mk
index 795a171809..7b66732ef4 100644
--- a/package/skeleton-init-systemd/skeleton-init-systemd.mk
+++ b/package/skeleton-init-systemd/skeleton-init-systemd.mk
@@ -29,7 +29,6 @@ else
 # a real (but empty) directory, and the "factory files" will be copied
 # back there by the tmpfiles.d mechanism.
 define SKELETON_INIT_SYSTEMD_ROOT_RO_OR_RW
-	mkdir -p $(TARGET_DIR)/etc/systemd/tmpfiles.d
 	echo "/dev/root / auto ro 0 1" >$(TARGET_DIR)/etc/fstab
 	echo "tmpfs /var tmpfs mode=1777 0 0" >>$(TARGET_DIR)/etc/fstab
 endef
@@ -38,6 +37,7 @@ define SKELETON_INIT_SYSTEMD_PRE_ROOTFS_VAR
 	rm -rf $(TARGET_DIR)/usr/share/factory/var
 	mv $(TARGET_DIR)/var $(TARGET_DIR)/usr/share/factory/var
 	mkdir -p $(TARGET_DIR)/var
+	mkdir -p $(TARGET_DIR)/usr/lib/tmpfiles.d
 	for i in $(TARGET_DIR)/usr/share/factory/var/* \
 		 $(TARGET_DIR)/usr/share/factory/var/lib/* \
 		 $(TARGET_DIR)/usr/share/factory/var/lib/systemd/*; do \
@@ -51,7 +51,7 @@ define SKELETON_INIT_SYSTEMD_PRE_ROOTFS_VAR
 			printf "C! %s - - - -\n" "$${j}" \
 			|| exit 1; \
 		fi; \
-	done >$(TARGET_DIR)/etc/tmpfiles.d/var-factory.conf
+	done >$(TARGET_DIR)/usr/lib/tmpfiles.d/buildroot-factory.conf
 endef
 SKELETON_INIT_SYSTEMD_ROOTFS_PRE_CMD_HOOKS += SKELETON_INIT_SYSTEMD_PRE_ROOTFS_VAR
 
-- 
2.25.1


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