$ git clone -n https://src.fedoraproject.org/rpms/rust-sha1collisiondetection.git /var/lib/mock/f41-build-810541-146760/root/chroot_tmpdir/scmroot/rust-sha1collisiondetection
Cloning into '/var/lib/mock/f41-build-810541-146760/root/chroot_tmpdir/scmroot/rust-sha1collisiondetection'...
$ git fetch origin 3b85a5ab2cd5a6ecffaee73f7a3e0a0b36a1c949:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha1collisiondetection
 * [new ref]         3b85a5ab2cd5a6ecffaee73f7a3e0a0b36a1c949 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3b85a5a Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces