aboutsummaryrefslogtreecommitdiffstats
path: root/trunk/src/undoall.c
blob: 90e924063ae15e4612276d62258cba1459f0e318 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
/* Copyright (C) 2002, 2005 Red Hat, Inc.
   Written by Jakub Jelinek <jakub@redhat.com>, 2002.

   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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#include <config.h>
#include <alloca.h>
#include <errno.h>
#include <error.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <time.h>
#include <unistd.h>
#include "prelinktab.h"

static int
undo_one (void **p, void *info)
{
  struct prelink_entry *ent = * (struct prelink_entry **) p;
  DSO *dso;
  struct stat64 st;
  struct prelink_link *hardlink;
  char *move = NULL;
  size_t movelen = 0;

  if (ent->done != 2)
    return 1;

  if (ent->type != ET_DYN
      && (ent->type != ET_EXEC || libs_only))
    return 1;

  dso = open_dso (ent->canon_filename);
  if (dso == NULL)
    goto error_out;

  if (fstat64 (dso->fd, &st) < 0)
    {
      error (0, errno, "%s changed during prelinking", ent->filename);
      goto error_out;
    }

  if (st.st_dev != ent->dev || st.st_ino != ent->ino)
    {
      error (0, 0, "%s changed during prelinking", ent->filename);
      goto error_out;
    }

  if (verbose)
    {
      if (dry_run)
	printf ("Would undo %s\n", ent->canon_filename);
      else
	printf ("Undoing %s\n", ent->canon_filename);
    }

  if (prelink_undo (dso))
    goto error_out;

  if (dry_run)
    close_dso (dso);
  else
    {
      if (update_dso (dso, NULL))
	{
	  dso = NULL;
	  goto error_out;
	}
    }

  dso = NULL;

  /* Redo hardlinks.  */
  for (hardlink = ent->hardlink; hardlink; hardlink = hardlink->next)
    {
      size_t len;

      if (wrap_lstat64 (hardlink->canon_filename, &st) < 0)
	{
	  error (0, 0, "Could not stat %s (former hardlink to %s)",
		 hardlink->canon_filename, ent->canon_filename);
	  continue;
	}

      if (st.st_dev != ent->dev || st.st_ino != ent->ino)
	{
	  error (0, 0, "%s is no longer hardlink to %s",
		 hardlink->canon_filename, ent->canon_filename);
	  continue;
	}

      if (verbose)
	{
	  if (dry_run)
	    printf ("Would link %s to %s\n", hardlink->canon_filename,
		    ent->canon_filename);
	  else
	    printf ("Linking %s to %s\n", hardlink->canon_filename,
		    ent->canon_filename);
	}

      len = strlen (hardlink->canon_filename);
      if (len + sizeof (".#prelink#") > movelen)
	{
	  movelen = len + sizeof (".#prelink#");
	  move = realloc (move, movelen);
	  if (move == NULL)
	    {
	      error (0, ENOMEM, "Could not hardlink %s to %s",
		     hardlink->canon_filename, ent->canon_filename);
	      movelen = 0;
	      continue;
	    }
	}

      memcpy (mempcpy (move, hardlink->canon_filename, len), ".#prelink#",
	      sizeof (".#prelink#"));
      if (wrap_rename (hardlink->canon_filename, move) < 0)
	{
	  error (0, errno, "Could not hardlink %s to %s",
		 hardlink->canon_filename, ent->canon_filename);
	  continue;
	}

      if (wrap_link (ent->canon_filename, hardlink->canon_filename) < 0)
	{
	  error (0, errno, "Could not hardlink %s to %s",
		 hardlink->canon_filename, ent->canon_filename);

	  if (wrap_rename (move, hardlink->canon_filename) < 0)
	    {
	      error (0, errno, "Could not rename %s back to %s",
		     move, hardlink->canon_filename);
	    }
	  continue;
	}

      if (wrap_unlink (move) < 0)
	{
	  error (0, errno, "Could not unlink %s", move);
	  continue;
	}
    }
  free (move);
  return 1;

error_out:
  if (dso)
    close_dso (dso);
  (*(int *)info)++;
  return 1;
}

int
undo_all (void)
{
  int failures = 0;
  htab_traverse (prelink_filename_htab, undo_one, &failures);
  return failures != 0;
}