mirror of
https://github.com/libguestfs/libguestfs.git
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0003ea2c3d
The guestfish-only commands such as 'alloc' and 'edit' are now generated from one place in the generator instead of being spread around ad-hoc in the C code.
121 lines
2.7 KiB
C
121 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 <sys/types.h>
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#include <sys/stat.h>
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#include "fish.h"
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/* guestfish edit command, suggested by Ján Ondrej, implemented by RWMJ */
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int
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run_edit (const char *cmd, int argc, char *argv[])
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{
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char filename[] = "/tmp/guestfishXXXXXX";
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char buf[256];
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const char *editor;
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struct stat oldstat, newstat;
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int r, fd;
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if (argc != 1) {
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fprintf (stderr, _("use '%s filename' to edit a file\n"), cmd);
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return -1;
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}
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/* Choose an editor. */
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if (STRCASEEQ (cmd, "vi"))
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editor = "vi";
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else if (STRCASEEQ (cmd, "emacs"))
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editor = "emacs -nw";
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else {
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editor = getenv ("EDITOR");
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if (editor == NULL)
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editor = "vi"; /* could be cruel here and choose ed(1) */
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}
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/* Download the file and write it to a temporary. */
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fd = mkstemp (filename);
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if (fd == -1) {
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perror ("mkstemp");
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return -1;
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}
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snprintf (buf, sizeof buf, "/dev/fd/%d", fd);
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if (guestfs_download (g, argv[0], buf) == -1) {
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close (fd);
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unlink (filename);
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return -1;
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}
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if (close (fd) == -1) {
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perror (filename);
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unlink (filename);
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return -1;
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}
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/* Get the old stat. */
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if (stat (filename, &oldstat) == -1) {
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perror (filename);
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unlink (filename);
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return -1;
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}
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/* Edit it. */
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/* XXX Safe? */
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snprintf (buf, sizeof buf, "%s %s", editor, filename);
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r = system (buf);
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if (r != 0) {
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perror (buf);
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unlink (filename);
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return -1;
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}
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/* Get the new stat. */
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if (stat (filename, &newstat) == -1) {
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perror (filename);
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unlink (filename);
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return -1;
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}
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/* Changed? */
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if (oldstat.st_ctime == newstat.st_ctime &&
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oldstat.st_size == newstat.st_size) {
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unlink (filename);
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return 0;
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}
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/* Write new content. */
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if (guestfs_upload (g, filename, argv[0]) == -1) {
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unlink (filename);
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return -1;
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}
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unlink (filename);
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return 0;
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}
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