$ git clone -n https://src.fedoraproject.org/rpms/gtkspellmm30.git /var/lib/mock/f40-build-2264069-54547/root/chroot_tmpdir/scmroot/gtkspellmm30
Cloning into '/var/lib/mock/f40-build-2264069-54547/root/chroot_tmpdir/scmroot/gtkspellmm30'...
$ git fetch origin 34c4dcd39b73eed8db16ba66b296249be4667b80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gtkspellmm30
 * [new ref]         34c4dcd39b73eed8db16ba66b296249be4667b80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 34c4dcd Conditionalize mingw build