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"- fixed not working symlinks to other symlinks

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- added a symlink cache (only per request) to cut down db accesses"
This commit is contained in:
Ralf Becker 2009-03-30 11:18:58 +00:00
parent d006ef24f9
commit 873ee33dc7
1 changed files with 90 additions and 4 deletions
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94
phpgwapi/inc/class.vfs_stream_wrapper.inc.php
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@ -136,9 +136,10 @@ class vfs_stream_wrapper implements iface_stream_wrapper
* Resolve the given path according to our fstab
*
* @param string $path
* @param boolean $do_symlink=true is a direct match allowed, default yes (must be false for a lstat or readlink!)
* @return string|boolean false if the url cant be resolved, should not happen if fstab has a root entry
*/
static function resolve_url($path)
static function resolve_url($path,$do_symlink=true)
{
static $cache = array();
@ -148,6 +149,9 @@ class vfs_stream_wrapper implements iface_stream_wrapper
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path') = '{$cache[$path]}' (from cache)");
return $cache[$path];
}
// check if we can already resolve path (or a part of it) with a known symlinks
$path = self::symlinkCache_resolve($path,$do_symlink);
// setting default user, passwd and domain, if it's not contained int the url
static $defaults;
if (is_null($defaults))
@ -356,6 +360,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
return false;
}
self::symlinkCache_remove($path);
return unlink($url);
}
@ -378,6 +383,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
return false;
}
self::symlinkCache_remove($path_from);
return rename($url_from,$url_to);
}
@ -417,6 +423,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
return false;
}
self::symlinkCache_remove($path);
return rmdir($url);
}
@ -691,7 +698,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
if (self::LOG_LEVEL > 1) error_log(__METHOD__."('$path',$flags,try_create_home=$try_create_home,check_symlink_components=$check_symlink_components)");
if (!($url = self::resolve_url($path)))
if (!($url = self::resolve_url($path,!($flags & STREAM_URL_STAT_LINK))))
{
if (self::LOG_LEVEL > 0) error_log(__METHOD__."('$path',$flags) can NOT resolve path!");
return false;
@ -704,7 +711,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
$stat = @stat($url); // suppressed the stat failed warnings
if ($stat && ($stat['mode'] & self::MODE_LINK) && ($l=$lpath = self::readlink($url)))
if ($stat && ($stat['mode'] & self::MODE_LINK) && ($lpath = self::readlink($url)))
{
if ($lpath[0] != '/') // concat relative path
{
@ -712,7 +719,12 @@ class vfs_stream_wrapper implements iface_stream_wrapper
}
$url = egw_vfs::PREFIX.$lpath;
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,$flags) symlink found and resolved to $url");
$stat = @stat($url);
// try reading the stat of the link
if ($stat = self::url_stat($lpath,STREAM_URL_STAT_QUIET))
{
if(isset($stat['url'])) $url = $stat['url']; // if stat returns an url use that, as there might be more links ...
self::symlinkCache_add($path,$url);
}
}
}
// check if a failed url_stat was for a home dir, in that case silently create it
@ -734,6 +746,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
if (!$stat && $check_symlink_components) // check if there's a symlink somewhere inbetween the path
{
$stat = self::check_symlink_components($path,$flags,$url);
if ($stat) self::symlinkCache_add($path,$url);
}
elseif(is_array($stat) && !isset($stat['url']))
{
@ -781,6 +794,7 @@ class vfs_stream_wrapper implements iface_stream_wrapper
{
$lpath = egw_vfs::concat(parse_url($url,PHP_URL_PATH),'../'.$lpath);
}
//self::symlinkCache_add($path,egw_vfs::PREFIX.$lpath);
$url = egw_vfs::PREFIX.egw_vfs::concat($lpath,$rel_path);
if (self::LOG_LEVEL > 1) error_log("$log --> lpath='$lpath', url='$url'");
return self::url_stat($url,$flags);
@ -794,6 +808,78 @@ class vfs_stream_wrapper implements iface_stream_wrapper
return false; // $path does not exist
}
/**
* Cache of already resolved symlinks
*
* @var array with path => target
*/
private static $symlink_cache = array();
/**
* Add a resolved symlink to cache
*
* @param string $path vfs path
* @param string $target target path
*/
static protected function symlinkCache_add($path,$target)
{
if ($path[0] != '/') $path = parse_url($path,PHP_URL_PATH);
if (isset(self::$symlink_cache[$path])) return; // nothing to do
if ($target[0] != '/') $target = parse_url($target,PHP_URL_PATH);
self::$symlink_cache[$path] = $target;
// sort longest path first
uksort(self::$symlink_cache,create_function('$b,$a','return strlen($a)-strlen($b);'));
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path,$target) cache now ".array2string(self::$symlink_cache));
}
/**
* Remove a resolved symlink from cache
*
* @param string $path vfs path
*/
static protected function symlinkCache_remove($path)
{
if ($path[0] != '/') $path = parse_url($path,PHP_URL_PATH);
unset(self::$symlink_cache[$path]);
if (self::LOG_LEVEL > 1) error_log(__METHOD__."($path) cache now ".array2string(self::$$symlink_cache));
}
/**
* Resolve a path from our symlink cache
*
* The cache is sorted from longer to shorter pathes.
*
* @param string $path
* @param boolean $do_symlink=true is a direct match allowed, default yes (must be false for a lstat or readlink!)
* @return string target or path, if path not found
*/
static protected function symlinkCache_resolve($path,$do_symlink=true)
{
if ($path[0] != '/') $path = parse_url($path,PHP_URL_PATH);
$strlen_path = strlen($path);
foreach(self::$symlink_cache as $p => $t)
{
if (($strlen_p = strlen($p)) > $strlen_path) continue; // $path can NOT start with $p
if ($path == $p)
{
if ($do_symlink) $target = $t;
break;
}
elseif (substr($path,0,$strlen_p+1) == $p.'/')
{
$target = $t . substr($path,$strlen_p);
break;
}
}
if (self::LOG_LEVEL > 1 && isset($target)) error_log(__METHOD__."($path) = $target");
return isset($target) ? $target : $path;
}
/**
* This method is called in response to readdir().
*