$ git clone -n https://src.fedoraproject.org/rpms/elementary-screenshot.git /var/lib/mock/f42-build-60945408-6586560/root/chroot_tmpdir/scmroot/elementary-screenshot
Cloning into '/var/lib/mock/f42-build-60945408-6586560/root/chroot_tmpdir/scmroot/elementary-screenshot'...
$ git fetch origin f8bfb7b8a3d2bb56747f0addcd073fb105ad056a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elementary-screenshot
 * [new ref]         f8bfb7b8a3d2bb56747f0addcd073fb105ad056a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8bfb7b Initial import (#2374301)