/* libguestfs - the guestfsd daemon
- * Copyright (C) 2009 Red Hat Inc.
+ * 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
#include <string.h>
#include <fcntl.h>
-#include "../src/guestfs_protocol.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
-fwrite_cb (void *fp_ptr, const void *buf, int len)
+write_cb (void *fd_ptr, const void *buf, size_t len)
{
- FILE *fp = *(FILE **)fp_ptr;
- return fwrite (buf, len, 1, fp) == 1 ? 0 : -1;
+ int fd = *(int *)fd_ptr;
+ return xwrite (fd, buf, len);
}
/* Has one FileIn parameter. */
-int
-do_tar_in (const char *dir)
+static int
+do_tXz_in (const char *dir, const char *filter)
{
- int err, r, len;
+ int err, r;
FILE *fp;
char *cmd;
- if (!root_mounted || dir[0] != '/') {
- cancel_receive ();
- reply_with_error ("tar-in: root must be mounted and path must be absolute");
- return -1;
- }
-
/* "tar -C /sysroot%s -xf -" but we have to quote the dir. */
- len = 2 * strlen (dir) + 32;
- cmd = malloc (len);
- if (!cmd) {
+ if (asprintf_nowarn (&cmd, "tar -C %R -%sxf - 2> %s",
+ dir, filter, error_file) == -1) {
err = errno;
- cancel_receive ();
+ r = cancel_receive ();
errno = err;
- reply_with_perror ("malloc");
+ if (r != -2) reply_with_perror ("asprintf");
return -1;
}
- strcpy (cmd, "tar -C /sysroot");
- shell_quote (cmd+15, len-15, dir);
- strcat (cmd, " -xf -");
+
+ if (verbose)
+ fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "w");
if (fp == NULL) {
err = errno;
- cancel_receive ();
+ r = cancel_receive ();
errno = err;
- reply_with_perror ("%s", cmd);
+ if (r != -2) reply_with_perror ("%s", cmd);
free (cmd);
return -1;
}
free (cmd);
- r = receive_file (fwrite_cb, &fp);
+ /* 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 */
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("write: %s", dir);
+ 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;
}
return -1;
}
- if (pclose (fp) == -1) {
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("pclose: %s", dir);
+ 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 FileOut parameter. */
+/* Has one FileIn parameter. */
int
-do_tar_out (const char *dir)
+do_tar_in (const char *dir)
{
- int r, len;
- FILE *fp;
- char *cmd;
- char buf[GUESTFS_MAX_CHUNK_SIZE];
-
- NEED_ROOT (-1);
- ABS_PATH (dir, -1);
-
- /* "tar -C /sysroot%s -cf - ." but we have to quote the dir. */
- len = 2 * strlen (dir) + 32;
- cmd = malloc (len);
- if (!cmd) {
- reply_with_perror ("malloc");
- return -1;
- }
- strcpy (cmd, "tar -C /sysroot");
- shell_quote (cmd+15, len-15, dir);
- strcat (cmd, " -cf - .");
-
- 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) == -1) {
- perror (dir);
- send_file_end (1); /* Cancel. */
- return -1;
- }
-
- send_file_end (0); /* Normal end of file. */
- return 0;
+ return do_tXz_in (dir, "");
}
/* Has one FileIn parameter. */
int
do_tgz_in (const char *dir)
{
- int err, r, len;
- FILE *fp;
- char *cmd;
-
- if (!root_mounted || dir[0] != '/') {
- cancel_receive ();
- reply_with_error ("tar-in: root must be mounted and path must be absolute");
- return -1;
- }
-
- /* "tar -C /sysroot%s -zxf -" but we have to quote the dir. */
- len = 2 * strlen (dir) + 32;
- cmd = malloc (len);
- if (!cmd) {
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("malloc");
- return -1;
- }
- strcpy (cmd, "tar -C /sysroot");
- shell_quote (cmd+15, len-15, dir);
- strcat (cmd, " -zxf -");
-
- fp = popen (cmd, "w");
- if (fp == NULL) {
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("%s", cmd);
- free (cmd);
- return -1;
- }
- free (cmd);
-
- r = receive_file (fwrite_cb, &fp);
- if (r == -1) { /* write error */
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("write: %s", dir);
- pclose (fp);
- return -1;
- }
- if (r == -2) { /* cancellation from library */
- pclose (fp);
- /* Do NOT send any error. */
- return -1;
- }
-
- if (pclose (fp) == -1) {
- err = errno;
- cancel_receive ();
- errno = err;
- reply_with_perror ("pclose: %s", dir);
- return -1;
- }
+ return do_tXz_in (dir, "z");
+}
- return 0;
+/* Has one FileIn parameter. */
+int
+do_txz_in (const char *dir)
+{
+ return do_tXz_in (dir, "J");
}
/* Has one FileOut parameter. */
-int
-do_tgz_out (const char *dir)
+static int
+do_tXz_out (const char *dir, const char *filter)
{
- int r, len;
+ int r;
FILE *fp;
char *cmd;
char buf[GUESTFS_MAX_CHUNK_SIZE];
- NEED_ROOT (-1);
- ABS_PATH (dir, -1);
-
/* "tar -C /sysroot%s -zcf - ." but we have to quote the dir. */
- len = 2 * strlen (dir) + 32;
- cmd = malloc (len);
- if (!cmd) {
- reply_with_perror ("malloc");
+ if (asprintf_nowarn (&cmd, "tar -C %R -%scf - .", dir, filter) == -1) {
+ reply_with_perror ("asprintf");
return -1;
}
- strcpy (cmd, "tar -C /sysroot");
- shell_quote (cmd+15, len-15, dir);
- strcat (cmd, " -zcf - .");
+
+ if (verbose)
+ fprintf (stderr, "%s\n", cmd);
fp = popen (cmd, "r");
if (fp == NULL) {
return -1;
}
- if (pclose (fp) == -1) {
+ if (pclose (fp) != 0) {
perror (dir);
send_file_end (1); /* Cancel. */
return -1;
}
- send_file_end (0); /* Normal end of file. */
+ 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");
+}
git.annexia.org / libguestfs.git / blobdiff