$ git clone -n https://src.fedoraproject.org/rpms/rust-mbrman.git /var/lib/mock/f40-build-2144318-50865/root/chroot_tmpdir/scmroot/rust-mbrman
Cloning into '/var/lib/mock/f40-build-2144318-50865/root/chroot_tmpdir/scmroot/rust-mbrman'...
$ git fetch origin 29aefd14744188de3cf7b3521a50185b9c3c52bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mbrman
 * [new ref]         29aefd14744188de3cf7b3521a50185b9c3c52bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 29aefd1 New release