$ git clone -n https://src.fedoraproject.org/rpms/re2.git /var/lib/mock/f41-build-847119-163721/root/chroot_tmpdir/scmroot/re2
Cloning into '/var/lib/mock/f41-build-847119-163721/root/chroot_tmpdir/scmroot/re2'...
$ git fetch origin 63114e05d5c71de41dca62d0804b229e259b495b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/re2
 * [new ref]         63114e05d5c71de41dca62d0804b229e259b495b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 63114e0 Build the Python extension, replacing python-fb-re2