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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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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 it will be mounted by PARTUUID which makes the kernel find the
appropriate disk automatically. 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 endmenu

5
package/base-files/Makefile
View File

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