[PATCHv2 9/9] fchdir: avoid extra chdir and fix test

[Eric Blake]

On Linux, with a forced ac_cv_func_fchdir=no, the test failed
because dup2 was not replaced, all because the shell variable
ac_cv_func_dup2 had not been set yet.

Meanwhile, computing the canonical pathname of a directory on
mingw was rather expensive -- multiple chdir()! -- but nothing
cared whether the name was canonical, just that it was absolute.

* modules/fchdir (Depends-on): Add dosname, filenamecat-lgpl,
getcwd-lgpl.
* lib/fchdir.c (get_name): Any absolute name will do; it does not
have to be canonical.
* m4/dup2.m4 (gl_REPLACE_DUP2): Ensure dup2 is replaced.

Signed-off-by: Eric Blake <address@hidden>
---
 ChangeLog      |    7 +++++++
 lib/fchdir.c   |   45 +++++++++++++++++++--------------------------
 m4/dup2.m4     |    1 +
 modules/fchdir |    3 +++
 4 files changed, 30 insertions(+), 26 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 7383f23..9f05815 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,12 @@
 2011-04-26  Eric Blake  <address@hidden>

+       fchdir: avoid extra chdir and fix test
+       * modules/fchdir (Depends-on): Add dosname, filenamecat-lgpl,
+       getcwd-lgpl.
+       * lib/fchdir.c (get_name): Any absolute name will do; it does not
+       have to be canonical.
+       * m4/dup2.m4 (gl_REPLACE_DUP2): Ensure dup2 is replaced.
+
        filenamecat-lgpl: fix licence
        * modules/filenamecat-lgpl (License): Mark as LGPLv2+, as intended
        when it was first created.
diff --git a/lib/fchdir.c b/lib/fchdir.c
index 94c4e71..2a70132 100644
--- a/lib/fchdir.c
+++ b/lib/fchdir.c
@@ -29,6 +29,9 @@
 #include <sys/types.h>
 #include <sys/stat.h>

+#include "dosname.h"
+#include "filenamecat.h"
+
 #ifndef REPLACE_OPEN_DIRECTORY
 # define REPLACE_OPEN_DIRECTORY 0
 #endif
@@ -90,36 +93,26 @@ ensure_dirs_slot (size_t fd)
   return true;
 }

-/* Return the canonical name of DIR in malloc'd storage.  */
+/* Return an absolute name of DIR in malloc'd storage.  */
 static char *
 get_name (char const *dir)
 {
+  char *cwd;
   char *result;
-  if (REPLACE_OPEN_DIRECTORY || !HAVE_CANONICALIZE_FILE_NAME)
-    {
-      /* The function canonicalize_file_name has not yet been ported
-         to mingw, with all its drive letter and backslash quirks.
-         Fortunately, getcwd is reliable in this case, but we ensure
-         we can get back to where we started before using it.  Treat
-         "." as a special case, as it is frequently encountered.  */
-      char *cwd = getcwd (NULL, 0);
-      int saved_errno;
-      if (dir[0] == '.' && dir[1] == '\0')
-        return cwd;
-      if (chdir (cwd))
-        return NULL;
-      result = chdir (dir) ? NULL : getcwd (NULL, 0);
-      saved_errno = errno;
-      if (chdir (cwd))
-        abort ();
-      free (cwd);
-      errno = saved_errno;
-    }
-  else
-    {
-      /* Avoid changing the directory.  */
-      result = canonicalize_file_name (dir);
-    }
+  int saved_errno;
+
+  if (IS_ABSOLUTE_FILE_NAME (dir))
+    return strdup (dir);
+
+  /* We often encounter "."; treat it as a special case.  */
+  cwd = getcwd (NULL, 0);
+  if (!cwd || (dir[0] == '.' && dir[1] == '\0'))
+    return cwd;
+
+  result = mfile_name_concat (cwd, dir, NULL);
+  saved_errno = errno;
+  free (cwd);
+  errno = saved_errno;
   return result;
 }

diff --git a/m4/dup2.m4 b/m4/dup2.m4
index b8794c2..62e31a8 100644
--- a/m4/dup2.m4
+++ b/m4/dup2.m4
@@ -69,6 +69,7 @@ AC_DEFUN([gl_FUNC_DUP2],
 AC_DEFUN([gl_REPLACE_DUP2],
 [
   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+  AC_CHECK_FUNCS_ONCE([dup2])
   if test $ac_cv_func_dup2 = yes; then
     REPLACE_DUP2=1
   fi
diff --git a/modules/fchdir b/modules/fchdir
index 46b481f..0a3ab99 100644
--- a/modules/fchdir
+++ b/modules/fchdir
@@ -9,9 +9,12 @@ Depends-on:
 close
 dirent
 dirfd
+dosname
 dup2
 fcntl
 fcntl-h
+filenamecat-lgpl
+getcwd-lgpl
 include_next
 malloc-posix
 open
-- 
1.7.4.4