NF: tool to refresh modification time of C files

matthew-brett · matthew-brett · commit 50583f161d23 · 2013-01-23T18:42:03.000-08:00
Build step checks modification times of C files relative to their source
Pyx files.  git checkout on windows sometimes generates C files that are
detectably earlier in modification time than the pyx files, so the build
step tries to rebuild them using Cython.  This utility touches the C
files to set the modification time later than the pyx files.
diff --git a/tools/touch_cython_cs.py b/tools/touch_cython_cs.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+""" Refresh modification times on Cython generated C files
+
+This is sometimes necessary on windows when the git checkout appears to
+sometimes checkout the C files with modification times earlier than the pyx
+files, triggering an attempt to rebuild the C files with Cython when running a
+build.
+"""
+from __future__ import with_statement
+import os
+from os.path import splitext, join as pjoin, isfile
+import sys
+import optparse
+
+
+# From http://stackoverflow.com/questions/1158076/implement-touch-using-python
+if sys.version_info[0] >= 3:
+    def touch(fname, times=None, ns=None, dir_fd=None):
+        with os.open(fname, os.O_APPEND, dir_fd=dir_fd) as f:
+            os.utime(f.fileno() if os.utime in os.supports_fd else fname,
+                times=times, ns=ns, dir_fd=dir_fd)
+else:
+    def touch(fname, times=None):
+        with file(fname, 'a'):
+            os.utime(fname, times)
+
+
+def main():
+    parser = optparse.OptionParser(usage='%prog [<root_dir>]')
+    (opts, args) = parser.parse_args()
+    if len(args) > 1:
+        parser.print_help()
+        sys.exit(-1)
+    elif len(args) == 1:
+        root_dir = args[0]
+    else:
+        root_dir = os.getcwd()
+    for dirpath, dirnames, filenames in os.walk(root_dir):
+        for fn in filenames:
+            if fn.endswith('.pyx'):
+                froot, ext = splitext(fn)
+                cfile = pjoin(dirpath, froot + '.c')
+                if isfile(cfile):
+                    touch(cfile)
+
+
+if __name__ == '__main__':
+    main()
