[Libguestfs] [PATCH nbdkit 2/2] tests: Test that public headers are ANSI (ISO C90) compatible.
Richard W.M. Jones
rjones at redhat.com
Mon Jan 14 12:15:25 UTC 2019
In commit 3775916120749e935d287f35cb29ff6c586656df (and before that in
discussions with Eric) we decided that we should try to allow plugins
to be compiled with C compilers other than GCC or Clang (or with very
old / peculiar / incompatible versions of those compilers).
However until we test this we cannot guarantee that changes to the
code will not break this in future, hence this test.
Note that GCC or Clang is still required to compile nbdkit itself.
---
tests/test-ansi-c-plugin.c | 167 +++++++++++++++++++++++++++++++++++++
tests/Makefile.am | 24 ++++++
tests/test-ansi-c.sh | 39 +++++++++
3 files changed, 230 insertions(+)
diff --git a/tests/test-ansi-c-plugin.c b/tests/test-ansi-c-plugin.c
new file mode 100644
index 0000000..8596ca5
--- /dev/null
+++ b/tests/test-ansi-c-plugin.c
@@ -0,0 +1,167 @@
+/* nbdkit
+ * Copyright (C) 2013-2019 Red Hat Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of Red Hat nor the names of its contributors may be
+ * used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <nbdkit-plugin.h>
+
+/* This looks like a 100MB disk with one empty partition. */
+static unsigned char bootsector[512] = {
+ 0xfa, 0xb8, 0x00, 0x10, 0x8e, 0xd0, 0xbc, 0x00,
+ 0xb0, 0xb8, 0x00, 0x00, 0x8e, 0xd8, 0x8e, 0xc0,
+ 0xfb, 0xbe, 0x00, 0x7c, 0xbf, 0x00, 0x06, 0xb9,
+ 0x00, 0x02, 0xf3, 0xa4, 0xea, 0x21, 0x06, 0x00,
+ 0x00, 0xbe, 0xbe, 0x07, 0x38, 0x04, 0x75, 0x0b,
+ 0x83, 0xc6, 0x10, 0x81, 0xfe, 0xfe, 0x07, 0x75,
+ 0xf3, 0xeb, 0x16, 0xb4, 0x02, 0xb0, 0x01, 0xbb,
+ 0x00, 0x7c, 0xb2, 0x80, 0x8a, 0x74, 0x01, 0x8b,
+ 0x4c, 0x02, 0xcd, 0x13, 0xea, 0x00, 0x7c, 0x00,
+ 0x00, 0xeb, 0xfe, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0xe1, 0x5b, 0x02, 0x00, 0x00, 0x00, 0x00, 0x02,
+ 0x03, 0x00, 0x83, 0xbc, 0x31, 0x0c, 0x80, 0x00,
+ 0x00, 0x00, 0x01, 0x1f, 0x03, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x55, 0xaa
+};
+static unsigned char data[104857600];
+
+static void
+ansi_c_load (void)
+{
+ memcpy (data, bootsector, sizeof bootsector);
+}
+
+static void *
+ansi_c_open (int readonly)
+{
+ return NBDKIT_HANDLE_NOT_NEEDED;
+}
+
+static int64_t
+ansi_c_get_size (void *handle)
+{
+ return (int64_t) sizeof (data);
+}
+
+#define THREAD_MODEL NBDKIT_THREAD_MODEL_SERIALIZE_ALL_REQUESTS
+
+static int
+ansi_c_pread (void *handle, void *buf, uint32_t count, uint64_t offset)
+{
+ memcpy (buf, data+offset, count);
+ return 0;
+}
+
+/* Strictly speaking (and we're compiling with -pedantic, so we _are_
+ * strictly speaking), ANSI C did not allow struct initialization
+ * using labels. However it was a common extension to C compilers of
+ * the period.
+ *
+ * Therefore we rely here on the order of fields in struct
+ * nbdkit_plugin. But that's OK because of nbdkit's stable ABI
+ * guarantee.
+ *
+ * If you are really writing an nbdkit plugin which can only use C90
+ * then you are advised to find the extension to your compiler which
+ * allows you to initialize named fields.
+ */
+static struct nbdkit_plugin plugin = {
+ 0, 0, 0,
+ "ansic",
+ 0,
+ PACKAGE_VERSION,
+ 0,
+ ansi_c_load,
+ 0,
+ 0, 0, 0,
+ ansi_c_open,
+ 0,
+ ansi_c_get_size,
+ 0, 0, 0, 0,
+ ansi_c_pread
+};
+
+NBDKIT_REGISTER_PLUGIN(plugin)
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 823b6c5..e96dac9 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -40,6 +40,7 @@ EXTRA_DIST = \
shebang.pl \
shebang.py \
shebang.rb \
+ test-ansi-c.sh \
test-blocksize.sh \
test-cache.sh \
test-cache-max-size.sh \
@@ -161,6 +162,29 @@ test_socket_activation_CFLAGS = $(WARNINGS_CFLAGS)
endif HAVE_PLUGINS
+# This builds a plugin using an ANSI (ISO C90) compiler to ensure that
+# the header file is compatible. The plugin does nothing very
+# interesting, it's mainly a compile test.
+TESTS += \
+ test-ansi-c.sh
+# check_LTLIBRARIES won't build a shared library (see automake manual).
+# So we have to do this and add a dependency.
+noinst_LTLIBRARIES += test-ansi-c-plugin.la
+test-ansi-c.sh: test-ansi-c-plugin.la
+
+test_ansi_c_plugin_la_SOURCES = \
+ test-ansi-c-plugin.c \
+ $(top_srcdir)/include/nbdkit-plugin.h
+test_ansi_c_plugin_la_CPPFLAGS = \
+ -std=c90 -pedantic \
+ -I$(top_srcdir)/include
+test_ansi_c_plugin_la_CFLAGS = \
+ $(WARNINGS_CFLAGS)
+# For use of the -rpath option, see:
+# https://lists.gnu.org/archive/html/libtool/2007-07/msg00067.html
+test_ansi_c_plugin_la_LDFLAGS = \
+ -module -avoid-version -shared -rpath /nowhere
+
if HAVE_CXX
# This builds a plugin and a filter using the C++ compiler. They
# don't do anything interesting when run.
diff --git a/tests/test-ansi-c.sh b/tests/test-ansi-c.sh
new file mode 100755
index 0000000..5942fad
--- /dev/null
+++ b/tests/test-ansi-c.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+# nbdkit
+# Copyright (C) 2017-2019 Red Hat Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#
+# * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#
+# * Neither the name of Red Hat nor the names of its contributors may be
+# used to endorse or promote products derived from this software without
+# specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+# SUCH DAMAGE.
+
+set -e
+
+# We only really care that the plugin compiled, so we don't
+# need to run it properly.
+libs=./.libs
+nbdkit $libs/test-ansi-c-plugin.so --version
--
2.20.1
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