$ git clone -n https://src.fedoraproject.org/rpms/swig.git /var/lib/mock/f40-build-780834-131350/root/chroot_tmpdir/scmroot/swig
Cloning into '/var/lib/mock/f40-build-780834-131350/root/chroot_tmpdir/scmroot/swig'...
$ git fetch origin 5a53f0765316cb20f06256356b81e8da6fcf7a70:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swig
 * [new ref]         5a53f0765316cb20f06256356b81e8da6fcf7a70 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5a53f07 4.2.0 bump (rhbz#2256296)