$ git clone -n https://src.fedoraproject.org/rpms/libwebcam.git /var/lib/mock/f45-build-17244-497/root/chroot_tmpdir/scmroot/libwebcam
Cloning into '/var/lib/mock/f45-build-17244-497/root/chroot_tmpdir/scmroot/libwebcam'...
$ git fetch origin 3865575cf83bbefdc5eafaaaefc1e2fd1cc723e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libwebcam
 * [new ref]         3865575cf83bbefdc5eafaaaefc1e2fd1cc723e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3865575 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild