$ git clone -n https://src.fedoraproject.org/rpms/rust-seahash.git /var/lib/mock/f45-build-44681-816/root/chroot_tmpdir/scmroot/rust-seahash
Cloning into '/var/lib/mock/f45-build-44681-816/root/chroot_tmpdir/scmroot/rust-seahash'...
$ git fetch origin a81732b4e3b6caee98fc27c17fe336ac8d0925f5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-seahash
 * [new ref]         a81732b4e3b6caee98fc27c17fe336ac8d0925f5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a81732b Regenerate with rust2rpm v28