Description of problem:
Dockerfile builds cannot change permissions of /etc/pki/ca-trust or create files inside it.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. create a Dockerfile with RUN chmod a+w -R /etc/pki/ca-trust/extracted
2. build an image
3. inspect /etc/pki/ca-trust/extracted permissions
It affects our ability to build release images:
This was a consequence of fixing https://bugzilla.redhat.com/show_bug.cgi?id=1826183. /etc/pki/ca-trust is a mount point for buildah, the contents of which are managed by the build container. When the build container starts, it adds the cluster-wide CA to the set of anchors, and then runs `update-ca-trust extract` as root.
In the case of the image registry, it wants /etc/pki/ca-trust to be writeable so that `update-ca-trust` can be run as non-root.
I think https://bugzilla.redhat.com/show_bug.cgi?id=1826183 needs to be considered for reversion, given the impact on existing build behavior.
It means that no one w/ a builder image that includes their own CAs can continue to function as expected, right? Because their CAs will be stomped by the always present mount that that fix introduced.
more specifically, here is my suggested course of action:
1) put in a change to 4.7 and 4.6 that does not mount the content (you can leave the rest of the logic in place)
2) get CI to update to the 4.6.z patch asap
3) reintroduce the mount based on a buildconfig api opt-in field. in 4.6+4.7.
Dropping the sort of error string folks might see into the bug, to help with searching:
Copying system trust bundle
cp: cannot remove '/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem': Permission denied
To facilitate quick backporting to 4.6.z, this BZ will only cover the removal of the buildah mount.
Optionally mounting /etc/pki/ca-trust will be addressed in https://bugzilla.redhat.com/show_bug.cgi?id=1895053.
Verified as follow version:
Using the follow Dockerfile:
RUN chmod a+w -R /etc/pki/ca-trust/extracted
RUN ls -ld /etc/pki/ca-trust/extracted
STEP 1: FROM registry.svc.ci.openshift.org/ocp/4.7:base
STEP 2: RUN chmod a+w -R /etc/pki/ca-trust/extracted
STEP 3: RUN ls -ld /etc/pki/ca-trust/extracted
drwxrwxrwx. 1 root root 70 Sep 1 19:39 /etc/pki/ca-trust/extracted
Added the case:OCP-37309 to the bug, but met issue "The external tracker URL you specified does not belong to a tracker known to Red Hat Bugzilla", anyway cases added.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: OpenShift Container Platform 4.7.0 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.