$ git clone -n https://src.fedoraproject.org/rpms/rust-mac_address.git /var/lib/mock/f40-build-1194416-22252/root/chroot_tmpdir/scmroot/rust-mac_address
Cloning into '/var/lib/mock/f40-build-1194416-22252/root/chroot_tmpdir/scmroot/rust-mac_address'...
$ git fetch origin faa7eda273cad4a9a748dbe2a88ac2c31c170ebf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-mac_address
 * [new ref]         faa7eda273cad4a9a748dbe2a88ac2c31c170ebf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at faa7eda Update to version 1.1.7