X-Git-Url: http://git.annexia.org/?a=blobdiff_plain;f=fuse%2Fguestmount.c;h=5a89fcbd6b6e0fbdb2a32d40d840930d33fc52e5;hb=aed8f220d279e910e0f398fea6fa674cc6a63783;hp=3d3da39d0c38ca7330d845baa67869168b628723;hpb=85c0bf53085e78b257cf71455a55924fe6e3943b;p=libguestfs.git

diff --git a/fuse/guestmount.c b/fuse/guestmount.c
index 3d3da39..5a89fcb 100644
--- a/fuse/guestmount.c
+++ b/fuse/guestmount.c
@@ -1,5 +1,5 @@
 /* guestmount - mount guests using libguestfs and FUSE
- * Copyright (C) 2009-2010 Red Hat Inc.
+ * Copyright (C) 2009-2011 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
@@ -59,6 +59,7 @@
 
 guestfs_h *g = NULL;
 int read_only = 0;
+int live = 0;
 int verbose = 0;
 int inspector = 0;
 int keys_from_stdin = 0;
@@ -744,19 +745,41 @@ fg_getxattr (const char *path, const char *name, char *value,
     free_attrs = 1;
   }
 
+  /* Find the matching attribute (index in 'i'). */
+  ssize_t r;
   size_t i;
-  int r = -ENOATTR;
   for (i = 0; i < xattrs->len; ++i) {
-    if (STREQ (xattrs->val[i].attrname, name)) {
-      size_t sz = xattrs->val[i].attrval_len;
-      if (sz > size)
-        sz = size;
-      memcpy (value, xattrs->val[i].attrval, sz);
-      r = 0;
+    if (STREQ (xattrs->val[i].attrname, name))
       break;
-    }
   }
 
+  if (i == xattrs->len) {       /* not found */
+    r = -ENOATTR;
+    goto out;
+  }
+
+  /* The getxattr man page is unclear, but if value == NULL then we
+   * return the space required (the caller then makes a second syscall
+   * after allocating the required amount of space).  If value != NULL
+   * then it's not clear what we should do, but it appears we should
+   * copy as much as possible and return -ERANGE if there's not enough
+   * space in the buffer.
+   */
+  size_t sz = xattrs->val[i].attrval_len;
+  if (value == NULL) {
+    r = sz;
+    goto out;
+  }
+
+  if (sz <= size)
+    r = sz;
+  else {
+    r = -ERANGE;
+    sz = size;
+  }
+  memcpy (value, xattrs->val[i].attrval, sz);
+
+out:
   if (free_attrs)
     guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
 
@@ -780,25 +803,47 @@ fg_listxattr (const char *path, char *list, size_t size)
     free_attrs = 1;
   }
 
+  /* Calculate how much space is required to hold the result. */
+  size_t space = 0;
+  size_t len;
   size_t i;
-  ssize_t copied = 0;
   for (i = 0; i < xattrs->len; ++i) {
-    size_t len = strlen (xattrs->val[i].attrname) + 1;
+    len = strlen (xattrs->val[i].attrname) + 1;
+    space += len;
+  }
+
+  /* The listxattr man page is unclear, but if list == NULL then we
+   * return the space required (the caller then makes a second syscall
+   * after allocating the required amount of space).  If list != NULL
+   * then it's not clear what we should do, but it appears we should
+   * copy as much as possible and return -ERANGE if there's not enough
+   * space in the buffer.
+   */
+  ssize_t r;
+  if (list == NULL) {
+    r = space;
+    goto out;
+  }
+
+  r = 0;
+  for (i = 0; i < xattrs->len; ++i) {
+    len = strlen (xattrs->val[i].attrname) + 1;
     if (size >= len) {
       memcpy (list, xattrs->val[i].attrname, len);
       size -= len;
       list += len;
-      copied += len;
+      r += len;
     } else {
-      copied = -ERANGE;
+      r = -ERANGE;
       break;
     }
   }
 
+ out:
   if (free_attrs)
     guestfs_free_xattr_list ((struct guestfs_xattr_list *) xattrs);
 
-  return copied;
+  return r;
 }
 
 static int
@@ -879,13 +924,15 @@ usage (int status)
              "  -i|--inspector       Automatically mount filesystems\n"
              "  --help               Display help message and exit\n"
              "  --keys-from-stdin    Read passphrases from stdin\n"
-             "  -m|--mount dev[:mnt] Mount dev on mnt (if omitted, /)\n"
+             "  --live               Connect to a live virtual machine\n"
+             "  -m|--mount dev[:mnt[:opts]] Mount dev on mnt (if omitted, /)\n"
              "  -n|--no-sync         Don't autosync\n"
              "  -o|--option opt      Pass extra option to FUSE\n"
              "  -r|--ro              Mount read-only\n"
              "  --selinux            Enable SELinux support\n"
              "  -v|--verbose         Verbose messages\n"
              "  -V|--version         Display version and exit\n"
+             "  -w|--rw              Mount read-write\n"
              "  -x|--trace           Trace guestfs API calls\n"
              ),
              program_name, program_name, program_name);
@@ -900,6 +947,8 @@ main (int argc, char *argv[])
   bindtextdomain (PACKAGE, LOCALEBASEDIR);
   textdomain (PACKAGE);
 
+  parse_config ();
+
   enum { HELP_OPTION = CHAR_MAX + 1 };
 
   /* The command line arguments are broadly compatible with (a subset
@@ -917,6 +966,7 @@ main (int argc, char *argv[])
     { "help", 0, 0, HELP_OPTION },
     { "inspector", 0, 0, 'i' },
     { "keys-from-stdin", 0, 0, 0 },
+    { "live", 0, 0, 0 },
     { "mount", 1, 0, 'm' },
     { "no-sync", 0, 0, 'n' },
     { "option", 1, 0, 'o' },
@@ -1017,6 +1067,8 @@ main (int argc, char *argv[])
         keys_from_stdin = 1;
       } else if (STREQ (long_options[option_index].name, "echo-keys")) {
         echo_keys = 1;
+      } else if (STREQ (long_options[option_index].name, "live")) {
+        live = 1;
       } else {
         fprintf (stderr, _("%s: unknown long option: %s (%d)\n"),
                  program_name, long_options[option_index].name, option_index);