$ git clone -n https://src.fedoraproject.org/rpms/forge-srpm-macros.git /var/lib/mock/f40-build-1931426-25121/root/chroot_tmpdir/scmroot/forge-srpm-macros
Cloning into '/var/lib/mock/f40-build-1931426-25121/root/chroot_tmpdir/scmroot/forge-srpm-macros'...
$ git fetch origin 9d4b236e2c1058bf410e88fa578a8c77ca9ffecb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/forge-srpm-macros
 * [new ref]         9d4b236e2c1058bf410e88fa578a8c77ca9ffecb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d4b236 Update to 0.3.2.