+/* 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., 675 Mass Ave, Cambridge, MA 02139, 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"
+
+/* 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, "compress -c");
+ return 0;
+ }
+ else if (STREQ (ctype, "gzip")) {
+ CHECK_SUPPORTED ("gzip");
+ if (level == -1)
+ snprintf (ret, n, "gzip -c");
+ else if (level >= 1 && level <= 9)
+ snprintf (ret, n, "gzip -c -%d", 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, "bzip2 -c");
+ else if (level >= 1 && level <= 9)
+ snprintf (ret, n, "bzip2 -c -%d", 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, "xz -c");
+ else if (level >= 0 && level <= 9)
+ snprintf (ret, n, "xz -c -%d", 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, "lzop -c");
+ else if (level >= 1 && level <= 9)
+ snprintf (ret, n, "lzop -c -%d", 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);
+}
git.annexia.org / libguestfs.git / commitdiff