$ git clone -n https://src.fedoraproject.org/rpms/messagelib.git /var/lib/mock/f42-build-3353612-45017/root/chroot_tmpdir/scmroot/messagelib
Cloning into '/var/lib/mock/f42-build-3353612-45017/root/chroot_tmpdir/scmroot/messagelib'...
$ git fetch origin 6a105485593503a3148509702296e3ddc025b27b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/messagelib
 * [new ref]         6a105485593503a3148509702296e3ddc025b27b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6a10548 24.12.3