Add /etc/libguestfs-tools.conf configuration file.

[libguestfs.git] / fish / config.c

diff --git a/fish/config.c b/fish/config.c
new file mode 100644 (file)
index 0000000..c92bc4e
--- /dev/null
+++ b/fish/config.c
@@ -0,0 +1,142 @@
+/* libguestfs - guestfish and guestmount shared option parsing
+ * Copyright (C) 2011 Red Hat Inc.
+ *
+ * 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.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifdef HAVE_LIBCONFIG
+#include <libconfig.h>
+#endif
+
+#include "guestfs.h"
+
+#include "options.h"
+
+static const char *home_filename = /* $HOME/ */ ".libguestfs-tools.rc";
+static const char *etc_filename = "/etc/libguestfs-tools.conf";
+
+#ifdef HAVE_LIBCONFIG
+
+/* Note that parse_config is called very early, before command line
+ * parsing and before the verbose flag has been set.
+ */
+
+void
+parse_config (void)
+{
+  const char *home;
+  size_t len;
+  char *path;
+  FILE *fp;
+  config_t conf;
+
+  config_init (&conf);
+
+  /* Try $HOME first. */
+  home = getenv ("HOME");
+  if (home != NULL) {
+    len = strlen (home) + 1 + strlen (home_filename) + 1;
+    path = malloc (len);
+    if (path == NULL) {
+      perror ("malloc");
+      exit (EXIT_FAILURE);
+    }
+    snprintf (path, len, "%s/%s", home, home_filename);
+
+    fp = fopen (path, "r");
+    if (fp != NULL) {
+      /*
+      if (verbose)
+        fprintf (stderr, "%s: reading configuration from %s\n",
+                 program_name, path);
+      */
+
+      if (config_read (&conf, fp) == CONFIG_FALSE) {
+        fprintf (stderr,
+                 _("%s: %s: line %d: error parsing configuration file: %s\n"),
+                 program_name, path, config_error_line (&conf),
+                 config_error_text (&conf));
+        exit (EXIT_FAILURE);
+      }
+
+      if (fclose (fp) == -1) {
+        perror (path);
+        exit (EXIT_FAILURE);
+      }
+
+      /* Notes:
+       *
+       * (1) It's not obvious from the documentation, that config_read
+       * completely resets the 'conf' structure.  This means we cannot
+       * call config_read twice on the two possible configuration
+       * files, but instead have to copy out settings into our
+       * variables between calls.
+       *
+       * (2) If the next call fails then 'read_only' variable is not
+       * updated.  Failure could happen just because the setting is
+       * missing from the configuration file, so we ignore it here.
+       */
+      config_lookup_bool (&conf, "read_only", &read_only);
+    }
+
+    free (path);
+  }
+
+  fp = fopen (etc_filename, "r");
+  if (fp != NULL) {
+    /*
+    if (verbose)
+      fprintf (stderr, "%s: reading configuration from %s\n",
+               program_name, etc_filename);
+    */
+
+    if (config_read (&conf, fp) == CONFIG_FALSE) {
+      fprintf (stderr,
+               _("%s: %s: line %d: error parsing configuration file: %s\n"),
+               program_name, etc_filename, config_error_line (&conf),
+               config_error_text (&conf));
+      exit (EXIT_FAILURE);
+    }
+
+    if (fclose (fp) == -1) {
+      perror (path);
+      exit (EXIT_FAILURE);
+    }
+
+    config_lookup_bool (&conf, "read_only", &read_only);
+  }
+
+  config_destroy (&conf);
+}
+
+#else /* !HAVE_LIBCONFIG */
+
+void
+parse_config (void)
+{
+  /*
+  if (verbose)
+    fprintf (stderr,
+             _("%s: compiled without libconfig, guestfish configuration file ignored\n"),
+             program_name);
+  */
+}
+
+#endif /* !HAVE_LIBCONFIG */