support: Add helpers to create paths longer than PATH_MAX
Add new helpers support_create_and_chdir_toolong_temp_directory and support_chdir_toolong_temp_directory to create and descend into directory trees longer than PATH_MAX. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
This commit is contained in:
parent
6b8dbbd03a
commit
fb7bff12e8
|
@ -1,5 +1,6 @@
|
|||
/* Temporary file handling for tests.
|
||||
Copyright (C) 1998-2022 Free Software Foundation, Inc.
|
||||
Copyright The GNU Tools Authors.
|
||||
This file is part of the GNU C Library.
|
||||
|
||||
The GNU C Library is free software; you can redistribute it and/or
|
||||
|
@ -20,15 +21,17 @@
|
|||
some 32-bit platforms. */
|
||||
#define _FILE_OFFSET_BITS 64
|
||||
|
||||
#include <support/check.h>
|
||||
#include <support/temp_file.h>
|
||||
#include <support/temp_file-internal.h>
|
||||
#include <support/support.h>
|
||||
|
||||
#include <errno.h>
|
||||
#include <paths.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
#include <xunistd.h>
|
||||
|
||||
/* List of temporary files. */
|
||||
static struct temp_name_list
|
||||
|
@ -36,14 +39,20 @@ static struct temp_name_list
|
|||
struct temp_name_list *next;
|
||||
char *name;
|
||||
pid_t owner;
|
||||
bool toolong;
|
||||
} *temp_name_list;
|
||||
|
||||
/* Location of the temporary files. Set by the test skeleton via
|
||||
support_set_test_dir. The string is not be freed. */
|
||||
static const char *test_dir = _PATH_TMP;
|
||||
|
||||
void
|
||||
add_temp_file (const char *name)
|
||||
/* Name of subdirectories in a too long temporary directory tree. */
|
||||
static char toolong_subdir[NAME_MAX + 1];
|
||||
static bool toolong_initialized;
|
||||
static size_t toolong_path_max;
|
||||
|
||||
static void
|
||||
add_temp_file_internal (const char *name, bool toolong)
|
||||
{
|
||||
struct temp_name_list *newp
|
||||
= (struct temp_name_list *) xcalloc (sizeof (*newp), 1);
|
||||
|
@ -53,12 +62,19 @@ add_temp_file (const char *name)
|
|||
newp->name = newname;
|
||||
newp->next = temp_name_list;
|
||||
newp->owner = getpid ();
|
||||
newp->toolong = toolong;
|
||||
temp_name_list = newp;
|
||||
}
|
||||
else
|
||||
free (newp);
|
||||
}
|
||||
|
||||
void
|
||||
add_temp_file (const char *name)
|
||||
{
|
||||
add_temp_file_internal (name, false);
|
||||
}
|
||||
|
||||
int
|
||||
create_temp_file_in_dir (const char *base, const char *dir, char **filename)
|
||||
{
|
||||
|
@ -90,8 +106,8 @@ create_temp_file (const char *base, char **filename)
|
|||
return create_temp_file_in_dir (base, test_dir, filename);
|
||||
}
|
||||
|
||||
char *
|
||||
support_create_temp_directory (const char *base)
|
||||
static char *
|
||||
create_temp_directory_internal (const char *base, bool toolong)
|
||||
{
|
||||
char *path = xasprintf ("%s/%sXXXXXX", test_dir, base);
|
||||
if (mkdtemp (path) == NULL)
|
||||
|
@ -99,16 +115,132 @@ support_create_temp_directory (const char *base)
|
|||
printf ("error: mkdtemp (\"%s\"): %m", path);
|
||||
exit (1);
|
||||
}
|
||||
add_temp_file (path);
|
||||
add_temp_file_internal (path, toolong);
|
||||
return path;
|
||||
}
|
||||
|
||||
char *
|
||||
support_create_temp_directory (const char *base)
|
||||
{
|
||||
return create_temp_directory_internal (base, false);
|
||||
}
|
||||
|
||||
static void
|
||||
ensure_toolong_initialized (void)
|
||||
{
|
||||
if (!toolong_initialized)
|
||||
FAIL_EXIT1 ("uninitialized toolong directory tree\n");
|
||||
}
|
||||
|
||||
static void
|
||||
initialize_toolong (const char *base)
|
||||
{
|
||||
long name_max = pathconf (base, _PC_NAME_MAX);
|
||||
name_max = (name_max < 0 ? 64
|
||||
: (name_max < sizeof (toolong_subdir) ? name_max
|
||||
: sizeof (toolong_subdir) - 1));
|
||||
|
||||
long path_max = pathconf (base, _PC_PATH_MAX);
|
||||
path_max = (path_max < 0 ? 1024
|
||||
: path_max <= PTRDIFF_MAX ? path_max : PTRDIFF_MAX);
|
||||
|
||||
/* Sanity check to ensure that the test does not create temporary directories
|
||||
in different filesystems because this API doesn't support it. */
|
||||
if (toolong_initialized)
|
||||
{
|
||||
if (name_max != strlen (toolong_subdir))
|
||||
FAIL_UNSUPPORTED ("name_max: Temporary directories in different"
|
||||
" filesystems not supported yet\n");
|
||||
if (path_max != toolong_path_max)
|
||||
FAIL_UNSUPPORTED ("path_max: Temporary directories in different"
|
||||
" filesystems not supported yet\n");
|
||||
return;
|
||||
}
|
||||
|
||||
toolong_path_max = path_max;
|
||||
|
||||
size_t len = name_max;
|
||||
memset (toolong_subdir, 'X', len);
|
||||
toolong_initialized = true;
|
||||
}
|
||||
|
||||
char *
|
||||
support_create_and_chdir_toolong_temp_directory (const char *basename)
|
||||
{
|
||||
char *base = create_temp_directory_internal (basename, true);
|
||||
xchdir (base);
|
||||
|
||||
initialize_toolong (base);
|
||||
|
||||
size_t sz = strlen (toolong_subdir);
|
||||
|
||||
/* Create directories and descend into them so that the final path is larger
|
||||
than PATH_MAX. */
|
||||
for (size_t i = 0; i <= toolong_path_max / sz; i++)
|
||||
{
|
||||
int ret = mkdir (toolong_subdir, S_IRWXU);
|
||||
if (ret != 0 && errno == ENAMETOOLONG)
|
||||
FAIL_UNSUPPORTED ("Filesystem does not support creating too long "
|
||||
"directory trees\n");
|
||||
else if (ret != 0)
|
||||
FAIL_EXIT1 ("Failed to create directory tree: %m\n");
|
||||
xchdir (toolong_subdir);
|
||||
}
|
||||
return base;
|
||||
}
|
||||
|
||||
void
|
||||
support_chdir_toolong_temp_directory (const char *base)
|
||||
{
|
||||
ensure_toolong_initialized ();
|
||||
|
||||
xchdir (base);
|
||||
|
||||
size_t sz = strlen (toolong_subdir);
|
||||
for (size_t i = 0; i <= toolong_path_max / sz; i++)
|
||||
xchdir (toolong_subdir);
|
||||
}
|
||||
|
||||
/* Helper functions called by the test skeleton follow. */
|
||||
|
||||
void
|
||||
support_set_test_dir (const char *path)
|
||||
static void
|
||||
remove_toolong_subdirs (const char *base)
|
||||
{
|
||||
test_dir = path;
|
||||
ensure_toolong_initialized ();
|
||||
|
||||
if (chdir (base) != 0)
|
||||
{
|
||||
printf ("warning: toolong cleanup base failed: chdir (\"%s\"): %m\n",
|
||||
base);
|
||||
return;
|
||||
}
|
||||
|
||||
/* Descend. */
|
||||
int levels = 0;
|
||||
size_t sz = strlen (toolong_subdir);
|
||||
for (levels = 0; levels <= toolong_path_max / sz; levels++)
|
||||
if (chdir (toolong_subdir) != 0)
|
||||
{
|
||||
printf ("warning: toolong cleanup failed: chdir (\"%s\"): %m\n",
|
||||
toolong_subdir);
|
||||
break;
|
||||
}
|
||||
|
||||
/* Ascend and remove. */
|
||||
while (--levels >= 0)
|
||||
{
|
||||
if (chdir ("..") != 0)
|
||||
{
|
||||
printf ("warning: toolong cleanup failed: chdir (\"..\"): %m\n");
|
||||
return;
|
||||
}
|
||||
if (remove (toolong_subdir) != 0)
|
||||
{
|
||||
printf ("warning: could not remove subdirectory: %s: %m\n",
|
||||
toolong_subdir);
|
||||
return;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
|
@ -123,6 +255,9 @@ support_delete_temp_files (void)
|
|||
around, to prevent PID reuse.) */
|
||||
if (temp_name_list->owner == pid)
|
||||
{
|
||||
if (temp_name_list->toolong)
|
||||
remove_toolong_subdirs (temp_name_list->name);
|
||||
|
||||
if (remove (temp_name_list->name) != 0)
|
||||
printf ("warning: could not remove temporary file: %s: %m\n",
|
||||
temp_name_list->name);
|
||||
|
@ -147,3 +282,9 @@ support_print_temp_files (FILE *f)
|
|||
fprintf (f, ")\n");
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
support_set_test_dir (const char *path)
|
||||
{
|
||||
test_dir = path;
|
||||
}
|
||||
|
|
|
@ -44,6 +44,15 @@ int create_temp_file_in_dir (const char *base, const char *dir,
|
|||
returns. The caller should free this string. */
|
||||
char *support_create_temp_directory (const char *base);
|
||||
|
||||
/* Create a temporary directory tree that is longer than PATH_MAX and schedule
|
||||
it for deletion. BASENAME is used as a prefix for the unique directory
|
||||
name, which the function returns. The caller should free this string. */
|
||||
char *support_create_and_chdir_toolong_temp_directory (const char *basename);
|
||||
|
||||
/* Change into the innermost directory of the directory tree BASE, which was
|
||||
created using support_create_and_chdir_toolong_temp_directory. */
|
||||
void support_chdir_toolong_temp_directory (const char *base);
|
||||
|
||||
__END_DECLS
|
||||
|
||||
#endif /* SUPPORT_TEMP_FILE_H */
|
||||
|
|
Loading…
Reference in New Issue