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/* libguestfs - the guestfsd daemon
* Copyright (C) 2014 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
/* Has one FileOut parameter. */
/* Takes optional arguments, consult optargs_bitmask. */
int
do_cpio_out (const char *dir, const char *format)
{
CLEANUP_FREE char *buf = NULL;
struct stat statbuf;
int r;
FILE *fp;
CLEANUP_FREE char *cmd = NULL;
CLEANUP_FREE char *buffer = NULL;
buffer = malloc (GUESTFS_MAX_CHUNK_SIZE);
if (buffer == NULL) {
reply_with_perror ("malloc");
return -1;
}
/* Check the filename exists and is a directory (RHBZ#908322). */
buf = sysroot_path (dir);
if (buf == NULL) {
reply_with_perror ("malloc");
return -1;
}
if (stat (buf, &statbuf) == -1) {
reply_with_perror ("stat: %s", dir);
return -1;
}
if (! S_ISDIR (statbuf.st_mode)) {
reply_with_error ("%s: not a directory", dir);
return -1;
}
/* Check the format is one of the permitted ones. */
if ((optargs_bitmask & GUESTFS_CPIO_OUT_FORMAT_BITMASK)) {
if (STRNEQ (format, "newc") && STRNEQ (format, "crc")) {
reply_with_error ("%s: format must be 'newc' or 'crc'", format);
return -1;
}
}
else
format = "newc";
if (asprintf_nowarn (&cmd, "cd %Q && find -print0 | %s -0 -o -H %s --quiet",
buf,
"cpio",
format) == -1) {
reply_with_perror ("asprintf");
return -1;
}
if (verbose)
fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "r");
if (fp == NULL) {
reply_with_perror ("%s", cmd);
return -1;
}
/* Now we must send the reply message, before the file contents. After
* this there is no opportunity in the protocol to send any error
* message back. Instead we can only cancel the transfer.
*/
reply (NULL, NULL);
while ((r = fread (buffer, 1, GUESTFS_MAX_CHUNK_SIZE, fp)) > 0) {
if (send_file_write (buffer, r) < 0) {
pclose (fp);
return -1;
}
}
if (ferror (fp)) {
fprintf (stderr, "fread: %s: %m\n", dir);
send_file_end (1); /* Cancel. */
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
fprintf (stderr, "pclose: %s: %m\n", dir);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
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