[elbe-devel] [PATCH v4 2/8] Add 'realpath' method to 'Filesystem'

[dion at linutronix.de]

From: Olivier Dion <dion at linutronix.de>

Signed-off-by: Olivier Dion <dion at linutronix.de>
---
 elbepack/filesystem.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/elbepack/filesystem.py b/elbepack/filesystem.py
index d9f3e50e..4c925d1c 100644
--- a/elbepack/filesystem.py
+++ b/elbepack/filesystem.py
@@ -84,6 +84,29 @@ class Filesystem(object):
     def mkdir(self, path):
         os.makedirs(self.fname(path))
 
+    def realpath(self, path):
+        if path[0] != os.sep:
+            path = os.sep + path
+        path = path.split(os.sep)
+        path.reverse()
+        real_path = [self.path]
+        while path:
+            candidate = path.pop()
+            if candidate == '' or candidate == os.curdir:
+                continue
+            elif candidate == os.pardir:
+                if len(real_path) > 1:
+                    real_path.pop()
+            else:
+                real_path.append(candidate)
+                new_path = os.sep.join(real_path)
+                if os.path.islink(new_path):
+                    elements = os.readlink(new_path)
+                    for element in reversed(elements.split(os.sep)):
+                        path.append(element)
+                    real_path.pop()
+        return os.sep.join(real_path)
+
     def symlink(self, src, path, allow_exists=False):
         try:
             os.symlink(src, self.fname(path))
-- 
2.11.0