In OpenWrt, /var is symlinked to /tmp by default. This is done to reduce
the amount of writes to the flash chip, which often don't have the
greatest durability. As a result, things like DHCP or UPnP lease files,
are not persistent across reboots.
Since OpenWrt can run on devices with more durable storage, it makes
sense to have an option for a persistent /var. Add an option to make
/var persistent. When enabled, /var will no longer be symlinked to /tmp,
but /var/run will be symlink to /tmp/run, as it should contain only
files that should not be kept during reboot. The option is off by
default, to maintain the current behaviour.
Signed-off-by: Stijn Tintel <st...@linux-ipv6.be>
---
config/Config-images.in | 6 ++++++
package/base-files/Makefile | 5 +++++
2 files changed, 11 insertions(+)
diff --git a/config/Config-images.in b/config/Config-images.in
index 4a7f08824b..dc68fade3c 100644
--- a/config/Config-images.in
+++ b/config/Config-images.in
@@ -303,4 +303,10 @@ menu "Target Images"
it will be mounted by PARTUUID which makes the kernel find the
appropriate disk automatically.
+ config TARGET_ROOTFS_PERSIST_VAR
+ bool "Make /var persistent"
+ default n
+ help
+ Do not symlink /var to /tmp, so that its content will
+ persist across reboots.
endmenu
diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index 5f816a0d1b..687fbc5f78 100644
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -172,8 +172,13 @@ define Package/base-files/install
mkdir -p $(1)/www
mkdir -p $(1)/root
$(LN) /proc/mounts $(1)/etc/mtab
+ifeq ($(CONFIG_TARGET_ROOTFS_PERSIST_VAR),n)
rm -f $(1)/var
$(LN) tmp $(1)/var
+else
+ mkdir $(1)/var
+ $(LN) /tmp/run $(1)/var/run
+endif
mkdir -p $(1)/etc
$(LN) /tmp/resolv.conf /tmp/TZ /tmp/localtime $(1)/etc/
--
2.31.1
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