$ git clone -n https://src.fedoraproject.org/rpms/qgis.git /var/lib/mock/f38-build-side-42-init-devel-1056976-29765/root/chroot_tmpdir/scmroot/qgis
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1056976-29765/root/chroot_tmpdir/scmroot/qgis'...
$ git fetch origin 4450ff15ec93de2f78183ead1b493f7978e0e01a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qgis
 * [new ref]         4450ff15ec93de2f78183ead1b493f7978e0e01a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4450ff1 Rebase patches