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/* libguestfs - the guestfsd daemon
* Copyright (C) 2011 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 "guestfs_protocol.h"
#include "daemon.h"
#include "actions.h"
GUESTFSD_EXT_CMD(str_compress, compress);
GUESTFSD_EXT_CMD(str_gzip, gzip);
GUESTFSD_EXT_CMD(str_bzip2, bzip2);
GUESTFSD_EXT_CMD(str_xz, xz);
GUESTFSD_EXT_CMD(str_lzop, lzop);
/* Has one FileOut parameter. */
static int
do_compressX_out (const char *file, const char *filter, int is_device)
{
int r;
FILE *fp;
char *cmd;
char buf[GUESTFS_MAX_CHUNK_SIZE];
/* The command will look something like:
* gzip -c /sysroot%s # file
* or:
* gzip -c < %s # device
*
* We have to quote the file or device name.
*
* The unnecessary redirect for devices is there because lzop
* unhelpfully refuses to compress anything that isn't a regular
* file.
*/
if (!is_device) {
if (asprintf_nowarn (&cmd, "%s %R", filter, file) == -1) {
reply_with_perror ("asprintf");
return -1;
}
} else {
if (asprintf_nowarn (&cmd, "%s < %Q", filter, file) == -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 (file);
send_file_end (1); /* Cancel. */
pclose (fp);
return -1;
}
if (pclose (fp) != 0) {
perror (file);
send_file_end (1); /* Cancel. */
return -1;
}
if (send_file_end (0)) /* Normal end of file. */
return -1;
return 0;
}
#define CHECK_SUPPORTED(prog) \
if (!prog_exists (prog)) { \
/* note: substring "not supported" must appear in this error */ \
reply_with_error ("compression type %s is not supported", prog); \
return -1; \
}
static int
get_filter (const char *ctype, int level, char *ret, size_t n)
{
if (STREQ (ctype, "compress")) {
CHECK_SUPPORTED ("compress");
if (level != -1) {
reply_with_error ("compress: cannot use optional level parameter with this compression type");
return -1;
}
snprintf (ret, n, "%s -c", str_compress);
return 0;
}
else if (STREQ (ctype, "gzip")) {
CHECK_SUPPORTED ("gzip");
if (level == -1)
snprintf (ret, n, "%s -c", str_gzip);
else if (level >= 1 && level <= 9)
snprintf (ret, n, "%s -c -%d", str_gzip, level);
else {
reply_with_error ("gzip: incorrect value for level parameter");
return -1;
}
return 0;
}
else if (STREQ (ctype, "bzip2")) {
CHECK_SUPPORTED ("bzip2");
if (level == -1)
snprintf (ret, n, "%s -c", str_bzip2);
else if (level >= 1 && level <= 9)
snprintf (ret, n, "%s -c -%d", str_bzip2, level);
else {
reply_with_error ("bzip2: incorrect value for level parameter");
return -1;
}
return 0;
}
else if (STREQ (ctype, "xz")) {
CHECK_SUPPORTED ("xz");
if (level == -1)
snprintf (ret, n, "%s -c", str_xz);
else if (level >= 0 && level <= 9)
snprintf (ret, n, "%s -c -%d", str_xz, level);
else {
reply_with_error ("xz: incorrect value for level parameter");
return -1;
}
return 0;
}
else if (STREQ (ctype, "lzop")) {
CHECK_SUPPORTED ("lzop");
if (level == -1)
snprintf (ret, n, "%s -c", str_lzop);
else if (level >= 1 && level <= 9)
snprintf (ret, n, "%s -c -%d", str_lzop, level);
else {
reply_with_error ("lzop: incorrect value for level parameter");
return -1;
}
return 0;
}
reply_with_error ("unknown compression type");
return -1;
}
/* Has one FileOut parameter. */
/* Takes optional arguments, consult optargs_bitmask. */
int
do_compress_out (const char *ctype, const char *file, int level)
{
char filter[64];
if (!(optargs_bitmask & GUESTFS_COMPRESS_OUT_LEVEL_BITMASK))
level = -1;
if (get_filter (ctype, level, filter, sizeof filter) == -1)
return -1;
return do_compressX_out (file, filter, 0);
}
/* Has one FileOut parameter. */
/* Takes optional arguments, consult optargs_bitmask. */
int
do_compress_device_out (const char *ctype, const char *file, int level)
{
char filter[64];
if (!(optargs_bitmask & GUESTFS_COMPRESS_DEVICE_OUT_LEVEL_BITMASK))
level = -1;
if (get_filter (ctype, level, filter, sizeof filter) == -1)
return -1;
return do_compressX_out (file, filter, 1);
}
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