[PATCH] (fixes issue 900) produce more appropriate error messages for ra_local on permissions problems.

[mark benedetto king <bk...@inquira.com>]

Improve error reporting for ra_local access when permission problems
and/or other operating-system issues prevent access.

* subversion/include/svn_error_codes.h
  (SVN_ERR_RA_LOCAL_REPOS_OPEN_FAILED): New error code.  Distinguished
  from SVN_ERR_RA_LOCAL_REPOS_NOT_FOUND in that the repository was found,
  but could not be opened.

* subversion/include/svn_error.h
  (svn_error_cause): Prototype and documentation for new function.

* subversion/libsvn_subr/svn_error.c
  (svn_error_cause): New function.

* subversion/libsvn_ra_local/split_url.c
  (svn_ra_local__split_URL): Inspect errors from svn_repos_open() rather
  than presuming that an error indicates that the repos was not found.


Index: subversion/include/svn_error_codes.h
===================================================================
--- subversion/include/svn_error_codes.h
+++ subversion/include/svn_error_codes.h	Fri Sep 13 09:44:31 2002
@@ -519,6 +519,10 @@
               SVN_ERR_RA_LOCAL_CATEGORY_START + 0,
               "Couldn't find a repository.")
 
+  SVN_ERRDEF (SVN_ERR_RA_LOCAL_REPOS_OPEN_FAILED,
+              SVN_ERR_RA_LOCAL_CATEGORY_START + 1,
+              "Couldn't open the repository.")
+
   /* svndiff errors */
 
   SVN_ERRDEF (SVN_ERR_SVNDIFF_INVALID_HEADER,
Index: subversion/include/svn_error.h
===================================================================
--- subversion/include/svn_error.h
+++ subversion/include/svn_error.h	Fri Sep 13 09:46:03 2002
@@ -113,6 +113,10 @@
    the last child error in CHAIN.  */
 void svn_error_compose (svn_error_t *chain, svn_error_t *new_err);
 
+/* Return the last child-error in CHAIN.  This is presumably
+   the "cause" of the error. */
+svn_error_t *svn_error_cause (svn_error_t *chain);
+
 
 /* Clear ERROR's pool.  Note that this is likely the top-level error
    pool shared with any other errors currently extant, though usually
Index: subversion/libsvn_subr/svn_error.c
===================================================================
--- subversion/libsvn_subr/svn_error.c
+++ subversion/libsvn_subr/svn_error.c	Fri Sep 13 09:35:56 2002
@@ -304,6 +304,14 @@
   chain->child = new_err;
 }
 
+svn_error_t *
+svn_error_cause (svn_error_t *chain)
+{
+  while (chain->child)
+    chain = chain->child;
+
+  return chain;
+}
 
 void
 svn_error_clear_all (svn_error_t *err)
Index: subversion/libsvn_ra_local/split_url.c
===================================================================
--- subversion/libsvn_ra_local/split_url.c
+++ subversion/libsvn_ra_local/split_url.c	Fri Sep 13 09:56:35 2002
@@ -104,6 +104,8 @@
      the last component from the URL, then try again. */
   while (1)
     {
+      svn_error_t *cause;
+
       /* Attempt to open a repository at URL. */
       err = svn_repos_open (&repos, candidate_url, subpool);
 
@@ -111,6 +113,13 @@
       if (err == SVN_NO_ERROR)
         break;
 
+      cause = svn_error_cause (err);
+      if (cause && !APR_STATUS_IS_ENOENT(cause->apr_err))
+        return svn_error_createf 
+         (SVN_ERR_RA_LOCAL_REPOS_OPEN_FAILED, 0, err, pool, 
+         "svn_ra_local__split_URL: Unable to open repository\n"
+         "   (%s)", URL);
+
       /* It would be strange indeed if "/" were a repository, but hey,
          people do strange things sometimes.  Anyway, if "/" failed
          the test above, then reduce it to the empty string.

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