Add conditional skip to some tests that depend on rpm-ostree
availability, but were not checking for its presence. These tests would
previously fail if rpm-ostree is not available. They will be skipped
now.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>
Add a new class `SubIdsDB` as a database of subordinate Ids, like the
ones in `/etc/subuid` and `/etc/subgid`. Methods to read and write
data from these two files are provided.
Add corresponding unit tests.
This stage takes /usr/lib/passwd and /usr/etc/passwd from an OSTree
checkout, merges them into one file, and store it as /etc/passwd in the
buildroot.
It does the same for /etc/group.
The reason for doing this is that there is an issue with unstable UIDs
and GIDs when creating OSTree commits from scratch. When there is a
package that creates a system user or a system group, it can change the
UID and GID of users and groups that are created later.
This is not a problem in traditional deployments because already created
users and groups never change their UIDs and GIDs, but with OSTree we
recreate the files from scratch and then replace the previous one so it
can actually change.
By copying the files to the build root before doing any other
operations, we can make sure that the UIDs and GIDs of already existing
users and groups won't change.
Co-author: Christian Kellner <christian@kellner.me>
The `capture_output` argument for subprocess.run was added in 3.7,
but want to support 3.6 as well. Change all the usages of it with
`stdout=subprocess.PIPE` that will have the same effect, at least
for stdout.
Use the `can_modify_immutable()` helper from the TestBase parent class
so we do not duplicate the code in multiple places. Similarly, make use
of the `have_rpm_ostree()` helper.
