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base-files: add option to make /var persistent (#7719)

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* base-files: add option to make /var persistent

In OpenWrt, /var is symlinked to /tmp by default. This is done to reduce
the amount of writes to the flash chip, which often have not 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 contains 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 <stijn@linux-ipv6.be>

* base-files: fix option to make /var persistent

The option was initially named TARGET_ROOTFS_LN_VAR_TMP, and the check
was correct. When renaming the option to something more suitable, the
check was changed to check for n, but when an option is not set, it's
not n but empty. This results in the check always evaluating to false.
Fix the check by checking for y with ifneq.

Fixes: 57807f50ded6 ("base-files: add option to make /var persistent")

Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

Co-authored-by: Stijn Tintel <stijn@linux-ipv6.be>
This commit is contained in:
Beginner 2021-08-24 19:13:55 +08:00 committed by GitHub
parent 3c9dcaf72e
commit 9b519e7747
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2 changed files with 13 additions and 0 deletions
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8
config/Config-images.in
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@ -315,4 +315,12 @@ 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. When enabled, /var/run will still be linked
to /tmp/run.
endmenu

5
package/base-files/Makefile
View File

@ -173,8 +173,13 @@ define Package/base-files/install
mkdir -p $(1)/www
mkdir -p $(1)/root
$(LN) /proc/mounts $(1)/etc/mtab
ifneq ($(CONFIG_TARGET_ROOTFS_PERSIST_VAR),y)
rm -f $(1)/var
$(LN) tmp $(1)/var
else
mkdir -p $(1)/var
$(LN) /tmp/run $(1)/var/run
endif
mkdir -p $(1)/etc
$(LN) /tmp/resolv.conf /tmp/TZ /tmp/localtime $(1)/etc/