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base-files: add option to make /var persistent

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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>
This commit is contained in:
Stijn Tintel 2019-02-25 15:05:07 +02:00
parent 31d984a96e
commit 57807f50de
2 changed files with 13 additions and 0 deletions
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8
config/Config-images.in
View File

@ -303,4 +303,12 @@ 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

@ -181,8 +181,13 @@ 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 $(1)/etc/mtab
ifeq ($(CONFIG_TARGET_ROOTFS_PERSIST_VAR),n)
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/