$ git clone -n https://src.fedoraproject.org/rpms/rust-plex.git /var/lib/mock/f45-build-43918-809/root/chroot_tmpdir/scmroot/rust-plex
Cloning into '/var/lib/mock/f45-build-43918-809/root/chroot_tmpdir/scmroot/rust-plex'...
$ git fetch origin a49ab2f5f1bc48a875ccc8a8cdf539ab7ef26c3c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-plex
 * [new ref]         a49ab2f5f1bc48a875ccc8a8cdf539ab7ef26c3c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a49ab2f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild