Added 'du' command.

This command estimates file usage for files and directories.

4 files changed, 89 insertions, 1 deletions

diff --git a/TODO b/TODO
index 2109e1df..48628f5e 100644
--- a/TODO
+++ b/TODO
@@ -120,7 +120,6 @@ Extra commands / functionality:
     chgrp
     grep (do it locally using pipe?)
     dd (?)
-    du
     ln / ln -s
     mknod
     readlink
diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index e33a7f70..2884e936 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -33,6 +33,7 @@ guestfsd_SOURCES = \
 	dir.c \
 	dmesg.c \
 	dropcaches.c \
+	du.c \
 	ext2.c \
 	file.c \
 	find.c \
diff --git a/daemon/du.c b/daemon/du.c
new file mode 100644
index 00000000..6287a207
--- /dev/null
+++ b/daemon/du.c
@@ -0,0 +1,72 @@
+/* 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 <inttypes.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+int64_t
+do_du (char *path)
+{
+  int r;
+  int64_t rv;
+  char *out, *err;
+  char *buf;
+  int len;
+
+  NEED_ROOT (-1);
+  ABS_PATH (path, -1);
+
+  /* Make the path relative to /sysroot. */
+  len = strlen (path) + 9;
+  buf = malloc (len);
+  if (!buf) {
+    reply_with_perror ("malloc");
+    return -1;
+  }
+  snprintf (buf, len, "/sysroot%s", path);
+
+  r = command (&out, &err, "du", "-s", buf, NULL);
+  free (buf);
+  if (r == -1) {
+    reply_with_error ("du: %s: %s", path, err);
+    free (out);
+    free (err);
+    return -1;
+  }
+
+  free (err);
+
+  if (sscanf (out, "%"SCNi64, &rv) != 1) {
+    reply_with_error ("du: %s: could not read output: %s", path, out);
+    free (out);
+    return -1;
+  }
+
+  free (out);
+
+  return rv;
+}
diff --git a/src/generator.ml b/src/generator.ml
index 85e5c02f..5885ff3f 100755
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -2583,6 +2583,22 @@ This command is mostly useful for interactive sessions.  It
 is I<not> intended that you try to parse the output string.
 Use C<statvfs> from programs.");
 
+  ("du", (RInt64 "sizekb", [String "path"]), 127, [],
+   [InitBasicFS, Always, TestOutputInt (
+      [["mkdir"; "/p"];
+       ["du"; "/p"]], 1 (* ie. 1 block, so depends on ext3 blocksize *))],
+   "estimate file space usage",
+   "\
+This command runs the C<du -s> command to estimate file space
+usage for C<path>.
+
+C<path> can be a file or a directory.  If C<path> is a directory
+then the estimate includes the contents of the directory and all
+subdirectories (recursively).
+
+The result is the estimated size in I<kilobytes>
+(ie. units of 1024 bytes).");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions