Added Augeas support.

1 files changed, 278 insertions, 0 deletions

diff --git a/daemon/augeas.c b/daemon/augeas.c
new file mode 100644
index 00000000..2b273875
--- /dev/null
+++ b/daemon/augeas.c
@@ -0,0 +1,278 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 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 <unistd.h>
+#include <augeas.h>
+
+#include "daemon.h"
+#include "actions.h"
+
+/* The Augeas handle.  We maintain a single handle per daemon, which
+ * is all that is necessary and reduces the complexity of the API
+ * considerably.
+ */
+static augeas *aug = NULL;
+
+#define NEED_AUG(errcode)						\
+  do {									\
+    if (!aug) {								\
+      reply_with_error ("%s: you must call 'aug-init' first to initialize Augeas", __func__); \
+      return (errcode);							\
+    }									\
+  }									\
+  while (0)
+
+/* We need to rewrite the root path so it is based at /sysroot. */
+int
+do_aug_init (const char *root, int flags)
+{
+  char *buf;
+  int len;
+
+  NEED_ROOT (-1);
+  ABS_PATH (root, -1);
+
+  if (aug) {
+    aug_close (aug);
+    aug = NULL;
+  }
+
+  len = strlen (root) + 8;
+  buf = malloc (len);
+  if (!buf) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+  snprintf (buf, len, "/sysroot%s", root);
+
+  aug = aug_init (buf, NULL, flags);
+  free (buf);
+
+  if (!aug) {
+    reply_with_error ("Augeas initialization failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_aug_close (void)
+{
+  NEED_AUG(-1);
+
+  aug_close (aug);
+  aug = NULL;
+
+  return 0;
+}
+
+int
+do_aug_defvar (const char *name, const char *expr)
+{
+  int r;
+
+  NEED_AUG (-1);
+
+  r = aug_defvar (aug, name, expr);
+  if (r == -1) {
+    reply_with_error ("Augeas defvar failed");
+    return -1;
+  }
+  return r;
+}
+
+guestfs_aug_defnode_ret *
+do_aug_defnode (const char *name, const char *expr, const char *val)
+{
+  static guestfs_aug_defnode_ret r;
+  int created;
+
+  NEED_AUG (NULL);
+
+  r.nrnodes = aug_defnode (aug, name, expr, val, &created);
+  if (r.nrnodes == -1) {
+    reply_with_error ("Augeas defnode failed");
+    return NULL;
+  }
+  r.created = created;
+  return &r;
+}
+
+char *
+do_aug_get (const char *path)
+{
+  const char *value = NULL;
+  char *v;
+  int r;
+
+  NEED_AUG (NULL);
+
+  r = aug_get (aug, path, &value);
+  if (r == 0) {
+    reply_with_error ("no matching node");
+    return NULL;
+  }
+  if (r != 1) {
+    reply_with_error ("Augeas get failed");
+    return NULL;
+  }
+
+  /* value can still be NULL here, eg. try with path == "/augeas".
+   * I don't understand this case, and it seems to contradict the
+   * documentation.
+   */
+  if (value == NULL) {
+    reply_with_error ("Augeas returned NULL match");
+    return NULL;
+  }
+
+  /* The value is an internal Augeas string, so we must copy it. GC FTW. */
+  v = strdup (value);
+  if (v == NULL) {
+    reply_with_perror ("strdup");
+    return NULL;
+  }
+
+  return v;			/* Caller frees. */
+}
+
+int
+do_aug_set (const char *path, const char *val)
+{
+  int r;
+
+  NEED_AUG (-1);
+
+  r = aug_set (aug, path, val);
+  if (r == -1) {
+    reply_with_error ("Augeas set failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_aug_insert (const char *path, const char *label, int before)
+{
+  int r;
+
+  NEED_AUG (-1);
+
+  r = aug_insert (aug, path, label, before);
+  if (r == -1) {
+    reply_with_error ("Augeas insert failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_aug_rm (const char *path)
+{
+  int r;
+
+  NEED_AUG (-1);
+
+  r = aug_rm (aug, path);
+  if (r == -1) {
+    reply_with_error ("Augeas rm failed");
+    return -1;
+  }
+
+  return r;
+}
+
+int
+do_aug_mv (const char *src, const char *dest)
+{
+  int r;
+
+  NEED_AUG (-1);
+
+  r = aug_mv (aug, src, dest);
+  if (r == -1) {
+    reply_with_error ("Augeas mv failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+char **
+do_aug_match (const char *path)
+{
+  char **matches = NULL;
+  void *vp;
+  int r;
+
+  NEED_AUG (NULL);
+
+  r = aug_match (aug, path, &matches);
+  if (r == -1) {
+    reply_with_error ("Augeas match failed");
+    return NULL;
+  }
+
+  /* This returns an array of length r, which we must extend
+   * and add a terminating NULL.
+   */
+  vp = realloc (matches, sizeof (char *) * (r+1));
+  if (vp == NULL) {
+    reply_with_perror ("realloc");
+    free (vp);
+    return NULL;
+  }
+  matches = vp;
+  matches[r] = NULL;
+
+  return matches;		/* Caller frees. */
+}
+
+int
+do_aug_save (void)
+{
+  NEED_AUG (-1);
+
+  if (aug_save (aug) == -1) {
+    reply_with_error ("Augeas save failed");
+    return -1;
+  }
+
+  return 0;
+}
+
+int
+do_aug_load (void)
+{
+  NEED_AUG (-1);
+
+  if (aug_load (aug) == -1) {
+    reply_with_error ("Augeas load failed");
+    return -1;
+  }
+
+  return 0;
+}