tree ea6467508419bf1f8085dd399b332c360c6219ed
parent a994cc0686ec343f959e2bca4f01b2defec2d4dc
author Brian Norris <briannorris@chromium.org> 1557267063 -0700
committer chrome-bot <chrome-bot@chromium.org> 1557714464 -0700

site_linux_router: truncate (not delete) uma-events

We're removing this file, but that can confuse other daemons, which may
then accidentally re-create the file with different owners/permissions,
locking out non-root daemons.

Rather than tease out the expected permissions or force all system
daemons to configure the correct owners/permissions, let's just avoid
deleting the file -- we can truncate it instead, which will retain its
original permissions.

Noticed in b:131906820, where shill is repeatedly complaining:

ERR shill[646]: [ERROR:serialization_utils.cc(290)] /var/lib/metrics/uma-events: cannot open: Permission denied

BUG=none
TEST=run network_WiFi_* test; watch size, permissions of .../uma-events

Change-Id: I8096917d385bab44444c8252acf702eab7a18407
Reviewed-on: https://chromium-review.googlesource.com/1600456
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Reviewed-by: Harpreet Grewal <harpreet@chromium.org>