$ git clone -n https://src.fedoraproject.org/rpms/corrosion.git /var/lib/mock/f40-build-1993385-43678/root/chroot_tmpdir/scmroot/corrosion
Cloning into '/var/lib/mock/f40-build-1993385-43678/root/chroot_tmpdir/scmroot/corrosion'...
$ git fetch origin 29754723479f1d385441277446c9dbf932c14628:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/corrosion
 * [new ref]         29754723479f1d385441277446c9dbf932c14628 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2975472 Update to version 0.4.5; Fixes RHBZ#2238266