$ git clone -n https://src.fedoraproject.org/rpms/mesa.git /var/lib/mock/f39-build-1644084-40265/root/chroot_tmpdir/scmroot/mesa
Cloning into '/var/lib/mock/f39-build-1644084-40265/root/chroot_tmpdir/scmroot/mesa'...
$ git fetch origin d0377e3d3b8f7cf09160cde7eec57424af084a44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mesa
 * [new ref]         d0377e3d3b8f7cf09160cde7eec57424af084a44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d0377e3 Backport MR #24045 to fix Iris crashes (#2238711)