From 540c85a1102c5876265502f8ae287ea697834d20 Mon Sep 17 00:00:00 2001
From: Richard Jones <rjones@redhat.com>
Date: Tue, 17 Nov 2009 19:51:29 +0000
Subject: [PATCH] New API call: fill - fill a file with octets

---
 daemon/Makefile.am |  1 +
 daemon/fill.c      | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 po/POTFILES.in     |  1 +
 src/MAX_PROC_NR    |  2 +-
 src/generator.ml   | 13 ++++++++++
 5 files changed, 92 insertions(+), 1 deletion(-)
 create mode 100644 daemon/fill.c

diff --git a/daemon/Makefile.am b/daemon/Makefile.am
index 72e1896..d049da6 100644
--- a/daemon/Makefile.am
+++ b/daemon/Makefile.am
@@ -41,6 +41,7 @@ guestfsd_SOURCES = \
 	ext2.c \
 	fallocate.c \
 	file.c \
+	fill.c \
 	find.c \
 	fsck.c \
 	glob.c \
diff --git a/daemon/fill.c b/daemon/fill.c
new file mode 100644
index 0000000..b1b0f5e
--- /dev/null
+++ b/daemon/fill.c
@@ -0,0 +1,76 @@
+/* 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 <unistd.h>
+#include <fcntl.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+int
+do_fill (int c, int len, const char *path)
+{
+  int fd;
+  ssize_t r;
+  size_t len_sz;
+  size_t n;
+  char buf[BUFSIZ];
+
+  if (c < 0 || c > 255) {
+    reply_with_error ("fill: %d: byte number must be in range 0..255", c);
+    return -1;
+  }
+  memset (buf, c, BUFSIZ);
+  if (len < 0) {
+    reply_with_error ("fill: %d: length is < 0", len);
+    return -1;
+  }
+  len_sz = (size_t) len;
+
+  CHROOT_IN;
+  fd = open (path, O_WRONLY | O_CREAT | O_NOCTTY, 0666);
+  CHROOT_OUT;
+
+  if (fd == -1) {
+    reply_with_perror ("open: %s", path);
+    return -1;
+  }
+
+  n = 0;
+  while (n < len_sz) {
+    r = write (fd, buf, len_sz - n < BUFSIZ ? len_sz - n : BUFSIZ);
+    if (r == -1) {
+      reply_with_perror ("write: %s", path);
+      close (fd);
+      return -1;
+    }
+    n += r;
+  }
+
+  if (close (fd) == -1) {
+    reply_with_perror ("close: %s", path);
+    return -1;
+  }
+
+  return 0;
+}
diff --git a/po/POTFILES.in b/po/POTFILES.in
index a125f2a..cf632fc 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -16,6 +16,7 @@ daemon/echo_daemon.c
 daemon/ext2.c
 daemon/fallocate.c
 daemon/file.c
+daemon/fill.c
 daemon/find.c
 daemon/fsck.c
 daemon/glob.c
diff --git a/src/MAX_PROC_NR b/src/MAX_PROC_NR
index 9d683f8..c34a804 100644
--- a/src/MAX_PROC_NR
+++ b/src/MAX_PROC_NR
@@ -1 +1 @@
-214
+215
diff --git a/src/generator.ml b/src/generator.ml
index bde50ff..4499eb7 100644
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -4086,6 +4086,19 @@ partition table), C<gpt> (a GPT/EFI-style partition table).  Other
 values are possible, although unusual.  See C<guestfs_part_init>
 for a full list.");
 
+  ("fill", (RErr, [Int "c"; Int "len"; Pathname "path"]), 215, [],
+   [InitBasicFS, Always, TestOutputBuffer (
+      [["fill"; "0x63"; "10"; "/test"];
+       ["read_file"; "/test"]], "cccccccccc")],
+   "fill a file with octets",
+   "\
+This command creates a new file called C<path>.  The initial
+content of the file is C<len> octets of C<c>, where C<c>
+must be a number in the range C<[0..255]>.
+
+To fill a file with zero bytes (sparsely), it is
+much more efficient to use C<guestfs_truncate_size>.");
+
 ]
 
 let all_functions = non_daemon_functions @ daemon_functions
-- 
1.8.3.1