X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=blobdiff_plain;f=daemon%2Ftar.c;h=5b73599a2fbf511556269f44ec308f3b40715cc0;hp=4d9feaa0d094e42c528491efaaa0601ca626a451;hb=50195d6ec4e893f894ef1bbf7af6eeda56f96600;hpb=887290e949d54c6ac4c9b787231e588f84f2367c

diff --git a/daemon/tar.c b/daemon/tar.c
index 4d9feaa..5b73599 100644
--- a/daemon/tar.c
+++ b/daemon/tar.c
@@ -1,5 +1,5 @@
 /* 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
@@ -28,39 +28,37 @@
 #include "actions.h"
 
 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 (char *dir)
+do_tar_in (const char *dir)
 {
-  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");
+    reply_with_error ("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 -xf -", dir) == -1) {
     err = errno;
     cancel_receive ();
     errno = err;
-    reply_with_perror ("malloc");
+    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) {
@@ -73,12 +71,15 @@ do_tar_in (char *dir)
   }
   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);
+    reply_with_error ("write error on directory: %s", dir);
     pclose (fp);
     return -1;
   }
@@ -88,11 +89,10 @@ do_tar_in (char *dir)
     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 */
+      cancel_receive ();
+    reply_with_error ("tar subcommand failed on directory: %s", dir);
     return -1;
   }
 
@@ -101,26 +101,21 @@ do_tar_in (char *dir)
 
 /* Has one FileOut parameter. */
 int
-do_tar_out (char *dir)
+do_tar_out (const char *dir)
 {
-  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 -cf - ." 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 -cf - .", dir) == -1) {
+    reply_with_perror ("asprintf");
     return -1;
   }
-  strcpy (cmd, "tar -C /sysroot");
-  shell_quote (cmd+15, len-15, dir);
-  strcat (cmd, " -cf - .");
+
+  if (verbose)
+    fprintf (stderr, "%s\n", cmd);
 
   fp = popen (cmd, "r");
   if (fp == NULL) {
@@ -150,43 +145,43 @@ do_tar_out (char *dir)
     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 FileIn parameter. */
-int
-do_tgz_in (char *dir)
+static int
+do_tXz_in (const char *dir, 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");
+    reply_with_error ("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) {
+  if (asprintf_nowarn (&cmd, "tar -C %R -%cxf -", dir, filter) == -1) {
     err = errno;
     cancel_receive ();
     errno = err;
-    reply_with_perror ("malloc");
+    reply_with_perror ("asprintf");
     return -1;
   }
-  strcpy (cmd, "tar -C /sysroot");
-  shell_quote (cmd+15, len-15, dir);
-  strcat (cmd, " -zxf -");
+
+  if (verbose)
+    fprintf (stderr, "%s\n", cmd);
 
   fp = popen (cmd, "w");
   if (fp == NULL) {
@@ -199,12 +194,12 @@ do_tgz_in (char *dir)
   }
   free (cmd);
 
-  r = receive_file (fwrite_cb, &fp);
+  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);
+    reply_with_error ("write error on directory: %s", dir);
     pclose (fp);
     return -1;
   }
@@ -214,39 +209,47 @@ do_tgz_in (char *dir)
     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 */
+      cancel_receive ();
+    reply_with_error ("tar subcommand failed on directory: %s", dir);
     return -1;
   }
 
   return 0;
 }
 
-/* Has one FileOut parameter. */
+/* Has one FileIn parameter. */
 int
-do_tgz_out (char *dir)
+do_tgz_in (const char *dir)
 {
-  int r, len;
+  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, char filter)
+{
+  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 -%ccf - .", 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) {
@@ -276,12 +279,28 @@ do_tgz_out (char *dir)
     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_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');
+}