libsysprof: add mountinfo helper

The goal of this helper is to simplify the process of parsing information
about mounts and the mountinfo for per-process maps. We should be able
to change sysprof-proc-source to use this and have better support for
getting the libraries within different mount namespaces.

src/tests/meson.build

@@ -43,6 +43,13 @@ test_addr_decode = executable('test-addr-decode', 'test-addr-decode.c',
   dependencies: test_deps,
 )
 
+test_mountinfo = executable('test-mountinfo',
+  [ 'test-mountinfo.c',
+    '../libsysprof/sysprof-mountinfo.c'],
+        c_args: test_cflags,
+  dependencies: test_deps,
+)
+
 
 if get_option('enable_gtk')
 

src/tests/test-mountinfo.c

@@ -0,0 +1,59 @@
+/* test-mountinfo.c
+ *
+ * Copyright 2019 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "sysprof-mountinfo.h"
+
+gint
+main (gint   argc,
+      gchar *argv[])
+{
+  g_autoptr(SysprofMountinfo) info = NULL;
+  g_autofree gchar *contents = NULL;
+  g_auto(GStrv) lines = NULL;
+  g_autoptr(GError) error = NULL;
+  g_autofree gchar *lookup = NULL;
+  gsize len;
+
+  if (argc != 3)
+    {
+      g_printerr ("usage: %s MOUNTINFO_FILE PATH_TO_TRANSLATE\n", argv[0]);
+      return 1;
+    }
+
+  info = sysprof_mountinfo_new ();
+
+  if (!g_file_get_contents ("/proc/mounts", &contents, &len, &error))
+    g_error ("%s", error->message);
+  sysprof_mountinfo_parse_mounts (info, contents);
+  g_free (g_steal_pointer (&contents));
+
+  if (!g_file_get_contents (argv[1], &contents, &len, &error))
+    g_error ("%s", error->message);
+  sysprof_mountinfo_parse_mountinfo (info, contents);
+
+  lookup = sysprof_mountinfo_translate (info, argv[2]);
+
+  if (lookup)
+    g_print ("%s\n", lookup);
+  else
+    g_print ("%s\n", argv[2]);
+
+  return 0;
+}