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-rw-r--r--src/leap/common/files.py42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/leap/common/files.py b/src/leap/common/files.py
index 7c878e1..9b80236 100644
--- a/src/leap/common/files.py
+++ b/src/leap/common/files.py
@@ -83,3 +83,45 @@ def mkdir_p(path):
pass
else:
raise
+
+
+# Twisted implementation of which
+def which(name, flags=os.X_OK, path_extension="/usr/sbin:/sbin"):
+ """
+ Search PATH for executable files with the given name.
+
+ On newer versions of MS-Windows, the PATHEXT environment variable will be
+ set to the list of file extensions for files considered executable. This
+ will normally include things like ".EXE". This fuction will also find files
+ with the given name ending with any of these extensions.
+
+ On MS-Windows the only flag that has any meaning is os.F_OK. Any other
+ flags will be ignored.
+
+ @type name: C{str}
+ @param name: The name for which to search.
+
+ @type flags: C{int}
+ @param flags: Arguments to L{os.access}.
+
+ @rtype: C{list}
+ @param: A list of the full paths to files found, in the
+ order in which they were found.
+ """
+
+ result = []
+ exts = filter(None, os.environ.get('PATHEXT', '').split(os.pathsep))
+ path = os.environ.get('PATH', None)
+ path += ":" + path_extension
+ if path is None:
+ return []
+ parts = path.split(os.pathsep)
+ for p in parts:
+ p = os.path.join(p, name)
+ if os.access(p, flags):
+ result.append(p)
+ for e in exts:
+ pext = p + e
+ if os.access(pext, flags):
+ result.append(pext)
+ return result