$ git clone -n https://src.fedoraproject.org/rpms/libwebcam.git /var/lib/mock/f41-build-side-1-2647725-27311/root/chroot_tmpdir/scmroot/libwebcam
Cloning into '/var/lib/mock/f41-build-side-1-2647725-27311/root/chroot_tmpdir/scmroot/libwebcam'...
$ git fetch origin 9b2bda70499b176a771ae5050ac6f37c56f8b04e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwebcam
 * [new ref]         9b2bda70499b176a771ae5050ac6f37c56f8b04e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b2bda7 convert GPLv3 license to SPDX