$ git clone -n https://github.com/xcp-ng-rpms/p11-kit /var/lib/mock/v8.3-incoming-10913-29394/root/chroot_tmpdir/scmroot/p11-kit
Cloning into '/var/lib/mock/v8.3-incoming-10913-29394/root/chroot_tmpdir/scmroot/p11-kit'...
$ git fetch origin 757bf37dae48ea6a855779031787268c273fa52d:KOJI_FETCH_HEAD
From https://github.com/xcp-ng-rpms/p11-kit
 * [new ref]         757bf37dae48ea6a855779031787268c273fa52d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 757bf37 Import p11-kit-0.24.1-4.xs8.src.rpm