$ git clone -n https://src.fedoraproject.org/rpms/kf6-kimageformats.git /var/lib/mock/f42-build-side-1-3570252-46748/root/chroot_tmpdir/scmroot/kf6-kimageformats
Cloning into '/var/lib/mock/f42-build-side-1-3570252-46748/root/chroot_tmpdir/scmroot/kf6-kimageformats'...
$ git fetch origin 573164bdeccd25e0d7ef6cba0b349f397a563e15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf6-kimageformats
 * [new ref]         573164bdeccd25e0d7ef6cba0b349f397a563e15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 573164b 6.15 and plasma 3.4 compatibility rebuild