$ git clone -n https://src.fedoraproject.org/rpms/swig.git /var/lib/mock/f40-build-1498082-23864/root/chroot_tmpdir/scmroot/swig
Cloning into '/var/lib/mock/f40-build-1498082-23864/root/chroot_tmpdir/scmroot/swig'...
$ git fetch origin 45987fab112c6f1f2bd3004c43dc12acd2ca72b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/swig
 * [new ref]         45987fab112c6f1f2bd3004c43dc12acd2ca72b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 45987fa Fix gcc -Wformat-security warning in R Raise function (rhbz#2277767)