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-rw-r--r--src/leap/util/fileutil.py73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/leap/util/fileutil.py b/src/leap/util/fileutil.py
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index 00000000..86a44a89
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+++ b/src/leap/util/fileutil.py
@@ -0,0 +1,73 @@
+from itertools import chain
+import os
+import platform
+import stat
+
+
+def is_user_executable(fpath):
+ st = os.stat(fpath)
+ return bool(st.st_mode & stat.S_IXUSR)
+
+
+def extend_path():
+ ourplatform = platform.system()
+ if ourplatform == "Linux":
+ return "/usr/local/sbin:/usr/sbin"
+ # XXX add mac / win extended search paths?
+
+
+def which(program):
+ """
+ an implementation of which
+ that extends the path with
+ other locations, like sbin
+ (f.i., openvpn binary is likely to be there)
+ @param program: a string representing the binary we're looking for.
+ """
+ def is_exe(fpath):
+ """
+ check that path exists,
+ it's a file,
+ and is executable by the owner
+ """
+ # we would check for access,
+ # but it's likely that we're
+ # using uid 0 + polkitd
+
+ return os.path.isfile(fpath)\
+ and is_user_executable(fpath)
+
+ def ext_candidates(fpath):
+ yield fpath
+ for ext in os.environ.get("PATHEXT", "").split(os.pathsep):
+ yield fpath + ext
+
+ def iter_path(pathset):
+ """
+ returns iterator with
+ full path for a given path list
+ and the current target bin.
+ """
+ for path in pathset.split(os.pathsep):
+ exe_file = os.path.join(path, program)
+ #print 'file=%s' % exe_file
+ for candidate in ext_candidates(exe_file):
+ if is_exe(candidate):
+ yield candidate
+
+ fpath, fname = os.path.split(program)
+ if fpath:
+ if is_exe(program):
+ return program
+ else:
+ # extended iterator
+ # with extra path
+ extended_path = chain(
+ iter_path(os.environ["PATH"]),
+ iter_path(extend_path()))
+ for candidate in extended_path:
+ if candidate is not None:
+ return candidate
+
+ # sorry bro.
+ return None