$ git clone -n https://src.fedoraproject.org/rpms/flatpak-kcm.git /var/lib/mock/f39-build-1629305-39538/root/chroot_tmpdir/scmroot/flatpak-kcm
Cloning into '/var/lib/mock/f39-build-1629305-39538/root/chroot_tmpdir/scmroot/flatpak-kcm'...
$ git fetch origin 8cadcc7a2c773f216ba4e2187fa0de8178023c29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/flatpak-kcm
 * [new ref]         8cadcc7a2c773f216ba4e2187fa0de8178023c29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8cadcc7 5.27.9