fish: Reimplement -i option using new C-based inspection.

Don't shell out to virt-inspector.  Instead, use the new C-based
inspection APIs.

This is much faster.

The new syntax is slightly different:

  guestfish -a disk.img -i
  guestfish -d guest -i

However, the old syntax still works.

1 files changed, 117 insertions, 0 deletions

diff --git a/fish/inspect.c b/fish/inspect.c
new file mode 100644
index 00000000..d17496f9
--- /dev/null
+++ b/fish/inspect.c
@@ -0,0 +1,117 @@
+/* guestfish - the filesystem interactive shell
+ * Copyright (C) 2010 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "fish.h"
+
+/* Global that saves the root device between inspect_mount and
+ * print_inspect_prompt.
+ */
+static char *root = NULL;
+
+static int
+compare_keys_len (const void *p1, const void *p2)
+{
+  const char *key1 = * (char * const *) p1;
+  const char *key2 = * (char * const *) p2;
+  return strlen (key1) - strlen (key2);
+}
+
+static int
+compare_keys (const void *p1, const void *p2)
+{
+  const char *key1 = * (char * const *) p1;
+  const char *key2 = * (char * const *) p2;
+  return strcasecmp (key1, key2);
+}
+
+/* This function implements the -i option. */
+void
+inspect_mount (void)
+{
+  char **roots = guestfs_inspect_os (g);
+  if (roots == NULL)
+    exit (EXIT_FAILURE);
+
+  if (roots[0] == NULL) {
+    fprintf (stderr, _("guestfish: no operating system was found on this disk\n"));
+    exit (EXIT_FAILURE);
+  }
+
+  if (roots[1] != NULL) {
+    fprintf (stderr, _("guestfish: multi-boot operating systems are not supported by the -i option\n"));
+    exit (EXIT_FAILURE);
+  }
+
+  root = roots[0];
+  free (roots);
+
+  char **mountpoints = guestfs_inspect_get_mountpoints (g, root);
+  if (mountpoints == NULL)
+    exit (EXIT_FAILURE);
+
+  /* Sort by key length, shortest key first, so that we end up
+   * mounting the filesystems in the correct order.
+   */
+  qsort (mountpoints, count_strings (mountpoints) / 2, 2 * sizeof (char *),
+         compare_keys_len);
+
+  size_t i;
+  for (i = 0; mountpoints[i] != NULL; i += 2) {
+    int r;
+    if (!read_only)
+      r = guestfs_mount_options (g, "", mountpoints[i+1], mountpoints[i]);
+    else
+      r = guestfs_mount_ro (g, mountpoints[i+1], mountpoints[i]);
+    if (r == -1)
+      exit (EXIT_FAILURE);
+  }
+
+  free_strings (mountpoints);
+}
+
+/* This function is called only if the above function was called,
+ * and only after we've printed the prompt in interactive mode.
+ */
+void
+print_inspect_prompt (void)
+{
+  char *name = guestfs_inspect_get_product_name (g, root);
+  if (STRNEQ (name, "unknown"))
+    printf (_("Operating system: %s\n"), name);
+  free (name);
+
+  char **mountpoints = guestfs_inspect_get_mountpoints (g, root);
+  if (mountpoints == NULL)
+    return;
+
+  /* Sort by key. */
+  qsort (mountpoints, count_strings (mountpoints) / 2, 2 * sizeof (char *),
+         compare_keys);
+
+  size_t i;
+  for (i = 0; mountpoints[i] != NULL; i += 2)
+    printf (_("%s mounted on %s\n"), mountpoints[i+1], mountpoints[i]);
+
+  free_strings (mountpoints);
+}