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/* GNU Guix --- Functional package management for GNU
Copyright (C) 2020 Ludovic Courtès <ludo@gnu.org>
This file is part of GNU Guix.
GNU Guix 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 3 of the License, or (at
your option) any later version.
GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>. */
/* This file implements part of the GNU ld.so audit interface. It is used by
the "fakechroot" engine of the 'guix pack -RR' wrappers to make sure the
loader looks for shared objects under the "fake" root directory. */
#define _GNU_SOURCE 1
#include <link.h>
#include <error.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
/* The pseudo root directory and store that we are relocating to. */
static const char *root_directory;
static char *store;
/* The original store, "/gnu/store" by default. */
static const char original_store[] = "@STORE_DIRECTORY@";
/* Like 'malloc', but abort if 'malloc' returns NULL. */
static void *
xmalloc (size_t size)
{
void *result = malloc (size);
assert (result != NULL);
return result;
}
unsigned int
la_version (unsigned int v)
{
if (v != LAV_CURRENT)
error (1, 0, "cannot handle interface version %u", v);
root_directory = getenv ("FAKECHROOT_BASE");
if (root_directory == NULL)
error (1, 0, "'FAKECHROOT_BASE' is not set");
store = xmalloc (strlen (root_directory) + sizeof original_store);
strcpy (store, root_directory);
strcat (store, original_store);
return v;
}
/* Return NAME, a shared object file name, relocated under STORE. This
function is called by the loader whenever it looks for a shared object. */
char *
la_objsearch (const char *name, uintptr_t *cookie, unsigned int flag)
{
char *result;
if (strncmp (name, original_store,
sizeof original_store - 1) == 0)
{
size_t len = strlen (name) - sizeof original_store
+ strlen (store) + 1;
result = xmalloc (len);
strcpy (result, store);
strcat (result, name + sizeof original_store - 1);
}
else
result = strdup (name);
return result;
}