mirror of
https://github.com/libguestfs/libguestfs.git
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112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/* guestfish - the filesystem interactive shell
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include "fish.h"
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static int parse_size (const char *str, off_t *size_rtn);
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int
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do_alloc (const char *cmd, int argc, char *argv[])
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{
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off_t size;
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int fd;
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if (argc != 2) {
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fprintf (stderr, "use 'alloc file size' to create an image\n");
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return -1;
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}
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if (parse_size (argv[1], &size) == -1)
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return -1;
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if (!guestfs_is_config (g)) {
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fprintf (stderr, "can't allocate or add disks after launching\n");
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return -1;
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}
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fd = open (argv[0], O_WRONLY|O_CREAT|O_NOCTTY|O_TRUNC, 0666);
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if (fd == -1) {
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perror (argv[0]);
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return -1;
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}
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if (posix_fallocate (fd, 0, size) == -1) {
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perror ("fallocate");
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close (fd);
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unlink (argv[0]);
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return -1;
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}
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if (close (fd) == -1) {
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perror (argv[0]);
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unlink (argv[0]);
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return -1;
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}
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if (guestfs_add_drive (g, argv[0]) == -1) {
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unlink (argv[0]);
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return -1;
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}
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return 0;
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}
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static int
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parse_size (const char *str, off_t *size_rtn)
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{
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uint64_t size;
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char type;
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/* Note that the parsing here is looser than what is specified in the
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* help, but we may tighten it up in future so beware.
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*/
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if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
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switch (type) {
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case 'k': case 'K': size *= 1024; break;
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case 'm': case 'M': size *= 1024 * 1024; break;
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case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
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case 's': size *= 512; break;
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default:
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fprintf (stderr, "could not parse size specification '%s'\n", str);
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return -1;
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}
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}
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else if (sscanf (str, "%"SCNu64, &size) == 1)
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size *= 1024;
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else {
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fprintf (stderr, "could not parse size specification '%s'\n", str);
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return -1;
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}
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/* XXX 32 bit file offsets, if anyone uses them? GCC should give
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* a warning here anyhow.
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*/
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*size_rtn = size;
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return 0;
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}
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