$ git clone -n https://src.fedoraproject.org/rpms/rust-rustdoc-types.git /var/lib/mock/f45-build-44582-815/root/chroot_tmpdir/scmroot/rust-rustdoc-types
Cloning into '/var/lib/mock/f45-build-44582-815/root/chroot_tmpdir/scmroot/rust-rustdoc-types'...
$ git fetch origin ad522935560f21e65b78b1b94a364adfefe17a4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustdoc-types
 * [new ref]         ad522935560f21e65b78b1b94a364adfefe17a4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ad52293 Simplify .gitignore