$ git clone -n https://src.fedoraproject.org/rpms/rust-md5-asm.git /var/lib/mock/f45-build-43172-800/root/chroot_tmpdir/scmroot/rust-md5-asm
Cloning into '/var/lib/mock/f45-build-43172-800/root/chroot_tmpdir/scmroot/rust-md5-asm'...
$ git fetch origin ceb3d9c91acb7c55300ce2ad791a1b8fba157931:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-md5-asm
 * [new ref]         ceb3d9c91acb7c55300ce2ad791a1b8fba157931 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ceb3d9c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild