$ git clone -n https://src.fedoraproject.org/rpms/cosmic-screenshot.git /var/lib/mock/f45-build-39623-750/root/chroot_tmpdir/scmroot/cosmic-screenshot
Cloning into '/var/lib/mock/f45-build-39623-750/root/chroot_tmpdir/scmroot/cosmic-screenshot'...
$ git fetch origin d15994086d6724122b041e0c208e71d5e8fb005b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-screenshot
 * [new ref]         d15994086d6724122b041e0c208e71d5e8fb005b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d159940 Update to 1.6.0