$ git clone -n https://src.fedoraproject.org/rpms/sweet-gtk-theme.git /var/lib/mock/f40-build-2330410-59006/root/chroot_tmpdir/scmroot/sweet-gtk-theme
Cloning into '/var/lib/mock/f40-build-2330410-59006/root/chroot_tmpdir/scmroot/sweet-gtk-theme'...
$ git fetch origin a0bb0d019af63795e505708a263e79123dd70550:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/sweet-gtk-theme
 * [new ref]         a0bb0d019af63795e505708a263e79123dd70550 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a0bb0d0 Update to v4.0