$ git clone -n https://src.fedoraproject.org/rpms/cc65.git /var/lib/mock/f40-build-1992358-43591/root/chroot_tmpdir/scmroot/cc65
Cloning into '/var/lib/mock/f40-build-1992358-43591/root/chroot_tmpdir/scmroot/cc65'...
$ git fetch origin d1adda9adca92864e2f9c00613c45a25fead60f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/cc65
 * [new ref]         d1adda9adca92864e2f9c00613c45a25fead60f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d1adda9 Build testsuite reference in C89 mode