$ git clone -n https://src.fedoraproject.org/rpms/rust-gufo-png.git /var/lib/mock/f45-build-42230-791/root/chroot_tmpdir/scmroot/rust-gufo-png
Cloning into '/var/lib/mock/f45-build-42230-791/root/chroot_tmpdir/scmroot/rust-gufo-png'...
$ git fetch origin 5b4acae25bd7d0911cb25707a5f5d6463e777f65:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gufo-png
 * [new ref]         5b4acae25bd7d0911cb25707a5f5d6463e777f65 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5b4acae Update to version 0.5.0; Fixes RHBZ#2529502