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/* 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"
/* guestfish edit command, suggested by Ján Ondrej, implemented by RWMJ */
static char *
load_file (const char *filename, int *len_r)
{
int fd, r, start;
char *content = NULL, *p;
char buf[65536];
*len_r = 0;
fd = open (filename, O_RDONLY);
if (fd == -1) {
perror (filename);
return NULL;
}
while ((r = read (fd, buf, sizeof buf)) > 0) {
start = *len_r;
*len_r += r;
p = realloc (content, *len_r + 1);
if (p == NULL) {
perror ("realloc");
free (content);
return NULL;
}
content = p;
memcpy (content + start, buf, r);
content[start+r] = '\0';
}
if (r == -1) {
perror (filename);
free (content);
return NULL;
}
if (close (fd) == -1) {
perror (filename);
free (content);
return NULL;
}
return content;
}
int
do_edit (const char *cmd, int argc, char *argv[])
{
char filename[] = "/tmp/guestfishXXXXXX";
char buf[256];
const char *editor;
char *content, *content_new;
int r, fd, size;
if (argc != 1) {
fprintf (stderr, _("use '%s filename' to edit a file\n"), cmd);
return -1;
}
/* Choose an editor. */
if (strcasecmp (cmd, "vi") == 0)
editor = "vi";
else if (strcasecmp (cmd, "emacs") == 0)
editor = "emacs -nw";
else {
editor = getenv ("EDITOR");
if (editor == NULL)
editor = "vi"; /* could be cruel here and choose ed(1) */
}
/* Download the file and write it to a temporary. */
fd = mkstemp (filename);
if (fd == -1) {
perror ("mkstemp");
return -1;
}
if ((content = guestfs_cat (g, argv[0])) == NULL) {
close (fd);
unlink (filename);
return -1;
}
if (xwrite (fd, content, strlen (content)) == -1) {
close (fd);
unlink (filename);
free (content);
return -1;
}
if (close (fd) == -1) {
perror (filename);
unlink (filename);
free (content);
return -1;
}
/* Edit it. */
/* XXX Safe? */
snprintf (buf, sizeof buf, "%s %s", editor, filename);
r = system (buf);
if (r != 0) {
perror (buf);
unlink (filename);
free (content);
return -1;
}
/* Reload it. */
content_new = load_file (filename, &size);
if (content_new == NULL) {
unlink (filename);
free (content);
return -1;
}
unlink (filename);
/* Changed? */
if (strlen (content) == size && strncmp (content, content_new, size) == 0) {
free (content);
free (content_new);
return 0;
}
/* Write new content. */
if (guestfs_write_file (g, argv[0], content_new, size) == -1) {
free (content);
free (content_new);
return -1;
}
free (content);
free (content_new);
return 0;
}
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