The file context created in add_file() is supposed to survive beyond the
end of function, so it needs its own copy of copy_path.

The failure scenario was observed in git-svn usage, with errors like

perl: subversion/libsvn_subr/dirent_uri.c:2489: svn_fspath__skip_ancestor: 
Assertion `svn_fspath__is_canonical(child_fspath)' failed.

See e.g.
http://stackoverflow.com/questions/17693255/git-svn-dcommit-fails-because-of-assertion-error-svn-fspath-is-canonicalchild
or
http://git.661346.n2.nabble.com/Fwd-Error-with-git-svn-pushing-a-rename-tt7599382.html

The second link also includes my analysis and a workaround for git-svn
at
http://git.661346.n2.nabble.com/Fwd-Error-with-git-svn-pushing-a-rename-tt7599382.html#a7601204

Index: subversion/libsvn_ra_serf/commit.c
===================================================================
--- subversion/libsvn_ra_serf/commit.c  (revision 1553332)
+++ subversion/libsvn_ra_serf/commit.c  (working copy)
@@ -1872,7 +1872,7 @@ add_file(const char *path,
   new_file->name = svn_relpath_basename(new_file->relpath, NULL);
   new_file->added = TRUE;
   new_file->base_revision = SVN_INVALID_REVNUM;
-  new_file->copy_path = copy_path;
+  new_file->copy_path = apr_pstrdup(new_file->pool, copy_path);
   new_file->copy_revision = copy_revision;
   new_file->changed_props = apr_hash_make(new_file->pool);
   new_file->removed_props = apr_hash_make(new_file->pool);

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