Move guestfish 'alloc' command to a separate file.

1 files changed, 111 insertions, 0 deletions

diff --git a/fish/alloc.c b/fish/alloc.c
new file mode 100644
index 00000000..8979acf4
--- /dev/null
+++ b/fish/alloc.c
@@ -0,0 +1,111 @@
+/* guestfish - the filesystem interactive shell
+ * 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 <fcntl.h>
+#include <inttypes.h>
+
+#include "fish.h"
+
+static int parse_size (const char *str, off_t *size_rtn);
+
+int
+do_alloc (int argc, char *argv[])
+{
+  off_t size;
+  int fd;
+
+  if (argc != 2) {
+    fprintf (stderr, "use 'alloc file size' to create an image\n");
+    return -1;
+  }
+
+  if (parse_size (argv[1], &size) == -1)
+    return -1;
+
+  if (g_launched) {
+    fprintf (stderr, "can't allocate or add disks after launching\n");
+    return -1;
+  }
+
+  fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_NONBLOCK|O_TRUNC, 0666);
+  if (fd == -1) {
+    perror (argv[0]);
+    return -1;
+  }
+
+  if (posix_fallocate (fd, 0, size) == -1) {
+    perror ("fallocate");
+    close (fd);
+    unlink (argv[0]);
+    return -1;
+  }
+
+  if (close (fd) == -1) {
+    perror (argv[0]);
+    unlink (argv[0]);
+    return -1;
+  }
+
+  if (guestfs_add_drive (g, argv[0]) == -1) {
+    unlink (argv[0]);
+    return -1;
+  }
+
+  return 0;
+}
+
+static int
+parse_size (const char *str, off_t *size_rtn)
+{
+  uint64_t size;
+  char type;
+
+  /* Note that the parsing here is looser than what is specified in the
+   * help, but we may tighten it up in future so beware.
+   */
+  if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
+    switch (type) {
+    case 'k': case 'K': size *= 1024; break;
+    case 'm': case 'M': size *= 1024 * 1024; break;
+    case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
+    case 's': size *= 512; break;
+    default:
+      fprintf (stderr, "could not parse size specification '%s'\n", str);
+      return -1;
+    }
+  }
+  else if (sscanf (str, "%"SCNu64, &size) == 1)
+    size *= 1024;
+  else {
+    fprintf (stderr, "could not parse size specification '%s'\n", str);
+    return -1;
+  }
+
+  /* XXX 32 bit file offsets, if anyone uses them?  GCC should give
+   * a warning here anyhow.
+   */
+  *size_rtn = size;
+
+  return 0;
+}