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/* libguestfs - the guestfsd daemon
* 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 <fcntl.h>
#include "read-file.h"
#include "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
#include "optgroups.h"
int
optgroup_xz_available (void)
{
int r = access ("/usr/bin/xz", X_OK);
return r == 0;
}
/* Redirect errors from the tar command to the error file, then
* provide functions for reading it in. We overwrite the file each
* time, and since it's small and stored on the appliance we don't
* bother to delete it.
*/
static const char *error_file = "/tmp/error";
static char *
read_error_file (void)
{
size_t len;
char *str = read_file (error_file, &len);
if (str == NULL) {
str = strdup ("(no error)");
if (str == NULL) {
perror ("strdup");
exit (EXIT_FAILURE);
}
len = strlen (str);
}
/* Remove trailing \n character if any. */
if (len > 0 && str[len-1] == '\n')
str[--len] = '\0';
return str; /* caller frees */
}
static int
write_cb (void *fd_ptr, const void *buf, size_t len)
{
int fd = *(int *)fd_ptr;
return xwrite (fd, buf, len);
}
/* Has one FileIn parameter. */
static int
do_tXz_in (const char *dir, const char *filter)
{
int err, r;
FILE *fp;
char *cmd;
/* "tar -C /sysroot%s -xf -" but we have to quote the dir. */
if (asprintf_nowarn (&cmd, "tar -C %R -%sxf - 2> %s",
dir, filter, error_file) == -1) {
err = errno;
r = cancel_receive ();
errno = err;
if (r != -2) reply_with_perror ("asprintf");
return -1;
}
if (verbose)
fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "w");
if (fp == NULL) {
err = errno;
r = cancel_receive ();
errno = err;
if (r != -2) reply_with_perror ("%s", cmd);
free (cmd);
return -1;
}
free (cmd);
/* The semantics of fwrite are too undefined, so write to the
* file descriptor directly instead.
*/
int fd = fileno (fp);
r = receive_file (write_cb, &fd);
if (r == -1) { /* write error */
if (cancel_receive () != -2) {
char *errstr = read_error_file ();
reply_with_error ("write error on directory: %s: %s", dir, errstr);
free (errstr);
}
pclose (fp);
return -1;
}
if (r == -2) { /* cancellation from library */
pclose (fp);
/* Do NOT send any error. */
return -1;
}
if (pclose (fp) != 0) {
if (r == -1) /* if r == 0, file transfer ended already */
r = cancel_receive ();
if (r != -2) {
char *errstr = read_error_file ();
reply_with_error ("tar subcommand failed on directory: %s: %s",
dir, errstr);
free (errstr);
}
return -1;
}
return 0;
}
/* Has one FileIn parameter. */
int
do_tar_in (const char *dir)
{
return do_tXz_in (dir, "");
}
/* Has one FileIn parameter. */
int
do_tgz_in (const char *dir)
{
return do_tXz_in (dir, "z");
}
/* Has one FileIn parameter. */
int
do_txz_in (const char *dir)
{
return do_tXz_in (dir, "J");
}
/* Has one FileOut parameter. */
static int
do_tXz_out (const char *dir, const char *filter)
{
int r;
FILE *fp;
char *cmd;
char buf[GUESTFS_MAX_CHUNK_SIZE];
/* "tar -C /sysroot%s -zcf - ." but we have to quote the dir. */
if (asprintf_nowarn (&cmd, "tar -C %R -%scf - .", dir, filter) == -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);
free (cmd);
return -1;
}
free (cmd);
/* 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 (buf, 1, sizeof buf, fp)) > 0) {
if (send_file_write (buf, r) < 0) {
pclose (fp);
return -1;
}
}
if (ferror (fp)) {
perror (dir);
send_file_end (1); /* Cancel. */
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
perror (dir);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
/* Has one FileOut parameter. */
int
do_tar_out (const char *dir)
{
return do_tXz_out (dir, "");
}
/* Has one FileOut parameter. */
int
do_tgz_out (const char *dir)
{
return do_tXz_out (dir, "z");
}
/* Has one FileOut parameter. */
int
do_txz_out (const char *dir)
{
return do_tXz_out (dir, "J");
}
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