utils

2 files changed, 103 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
new file mode 100644
index 0000000..9301e8c
--- /dev/null
+++ b/src/utils.c
@@ -0,0 +1,77 @@
+/* Copyright © 2013 Canonical Limited
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ * Author: Ryan Lortie <desrt@desrt.ca>
+ */
+
+#include "utils.h"
+
+gboolean
+write_symlinked_file (const gchar  *applications_dir,
+                      const gchar  *basename,
+                      const gchar  *contents,
+                      GError      **error)
+{
+  gboolean success = FALSE;
+  gchar *linkname;
+  gchar *filename;
+  gchar *expected_link_content;
+  gchar *link_content;
+  gchar *dirname;
+
+  dirname = g_build_filename (dir, ".metadata", NULL);
+  linkname = g_build_filename (dir, basename, NULL);
+  filename = g_build_filename (dir, ".metadata", basename, NULL);
+  expected_link_content = g_build_filename (".metadata", basename, NULL);
+
+  link_content = g_file_read_link (linkname, NULL);
+  if (!link_content || !g_str_equal (link_content, expected_link_content))
+    {
+      /* Ignore failures to unlink -- the file may simply not exist.
+       * Any other errors will be caught when we actually try to replace
+       * it...
+       */
+      unlink (linkname);
+
+      if (symlink (expected_link_content, linkname) != 0)
+        {
+          gint saved_errno = errno;
+
+          g_set_error (error, G_FILE_ERROR, g_file_error_from_errno (saved_errno),
+                       "Unable to create symbolic link %s: %s", linkname, g_strerror (saved_errno));
+          goto out;
+        }
+    }
+
+  /* OK.  The link should be setup properly now.
+   *
+   * Again, ignore any errors here -- we can report them when
+   * g_file_set_contents() fails.
+   */
+  mkdir (dirname, 0777);
+
+  success = g_file_set_contents (filename, content, -1, error);
+
+out:
+  g_free (dirname);
+  g_free (linkname);
+  g_free (filename);
+  g_free (expected_link_content);
+  g_free (link_content);
+
+  return success;
+}
diff --git a/src/utils.h b/src/utils.h
new file mode 100644
index 0000000..32416a8
--- /dev/null
+++ b/src/utils.h
@@ -0,0 +1,26 @@
+/* Copyright © 2013 Canonical Limited
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ * Author: Ryan Lortie <desrt@desrt.ca>
+ */
+
+#include <glib.h>
+
+gboolean write_symlinked_file (const gchar  *applications_dir,
+                               const gchar  *basename,
+                               const gchar  *contents,
+                               GError      **error);