$ git clone -n https://src.fedoraproject.org/rpms/rust-bitfield-struct.git /var/lib/mock/f45-build-40443-772/root/chroot_tmpdir/scmroot/rust-bitfield-struct
Cloning into '/var/lib/mock/f45-build-40443-772/root/chroot_tmpdir/scmroot/rust-bitfield-struct'...
$ git fetch origin c13443c19d6beef38bb58bcefadf7d352c4326d7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-bitfield-struct
 * [new ref]         c13443c19d6beef38bb58bcefadf7d352c4326d7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c13443c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild