$ git clone -n https://src.fedoraproject.org/rpms/acl.git /var/lib/mock/f40-build-2194937-51502/root/chroot_tmpdir/scmroot/acl
Cloning into '/var/lib/mock/f40-build-2194937-51502/root/chroot_tmpdir/scmroot/acl'...
$ git fetch origin 9c90b66b09ab785a107149ee88fcf75935b799a0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/acl
 * [new ref]         9c90b66b09ab785a107149ee88fcf75935b799a0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9c90b66 make acl compatible with -D_FORTIFY_SOURCE=3