$ git clone -n https://src.fedoraproject.org/rpms/golang-modernc-gc-2.git /var/lib/mock/f40-build-737433-107151/root/chroot_tmpdir/scmroot/golang-modernc-gc-2
Cloning into '/var/lib/mock/f40-build-737433-107151/root/chroot_tmpdir/scmroot/golang-modernc-gc-2'...
$ git fetch origin c62c66f9ed19ce0971562851fab732f1dd7a1a0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-modernc-gc-2
 * [new ref]         c62c66f9ed19ce0971562851fab732f1dd7a1a0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c62c66f Disable checks that fail on some Fedora versions