$ git clone -n https://src.fedoraproject.org/rpms/mesa.git /var/lib/mock/f41-build-820147-152085/root/chroot_tmpdir/scmroot/mesa
Cloning into '/var/lib/mock/f41-build-820147-152085/root/chroot_tmpdir/scmroot/mesa'...
$ git fetch origin bd66117503acfb8a1e8cc7961f1e8185805a3c0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mesa
 * [new ref]         bd66117503acfb8a1e8cc7961f1e8185805a3c0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd66117 Backport AV1 fix