$ git clone -n https://src.fedoraproject.org/rpms/cosmic-screenshot.git /var/lib/mock/f41-build-side-1-3108713-39383/root/chroot_tmpdir/scmroot/cosmic-screenshot
Cloning into '/var/lib/mock/f41-build-side-1-3108713-39383/root/chroot_tmpdir/scmroot/cosmic-screenshot'...
$ git fetch origin d35cac440df353472e38b5b2b9448138af1885ed:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cosmic-screenshot
 * [new ref]         d35cac440df353472e38b5b2b9448138af1885ed -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d35cac4 "Update to 1.0.0~alpha.3"