$ git clone -n https://src.fedoraproject.org/rpms/rust-nginx-sys.git /var/lib/mock/f45-build-43354-802/root/chroot_tmpdir/scmroot/rust-nginx-sys
Cloning into '/var/lib/mock/f45-build-43354-802/root/chroot_tmpdir/scmroot/rust-nginx-sys'...
$ git fetch origin 4b0867089439f8a2b7b24c49d926445cac171496:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-nginx-sys
 * [new ref]         4b0867089439f8a2b7b24c49d926445cac171496 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4b08670 Allow shlex version 2