commit 6825a0185e42c06626116334ee6c0b395562e4d7
author Josh Lehan <krellan@google.com> Thu Mar 17 18:31:39 2022 -0700
committer Josh Lehan <krellan@google.com> Thu Mar 17 18:31:39 2022 -0700
tree 87eba7986899392a0c7298c3ab2061e2dc7f53e0
parent abace2cb2802747516619f3ef10ba9727979c1e2

Use well-known passwd constants if user root

If the intended user is root, use well-known constants for UID, GID,
and home directory, to avoid wrongly using those of the normal user
running this script.

Using -f flag for groupadd, to avoid erroring out if group name
already exists for this user name.

Tested: No longer fails with weird groupadd errors if
run-unit-test-docker.sh command line contains USER="root" setting.

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Idc6158386ce96a6e2fa97dd0eb56b928f18e7a35