Initial revision

Tools/scripts/linktree.py

@@ -0,0 +1,76 @@
+#! /usr/local/python
+
+# linktree
+#
+# Make a copy of a directory tree with symbolic links to all files in the
+# original tree.
+# All symbolic links go to a special symbolic link at the top, so you
+# can easily fix things if the original source tree moves.
+# See also "mkreal".
+#
+# usage: mklinks oldtree newtree
+
+import sys, posix, path
+
+LINK = '.LINK' # Name of special symlink at the top.
+
+debug = 0
+
+def main():
+	if not 3 <= len(sys.argv) <= 4:
+		print 'usage:', sys.argv[0], 'oldtree newtree [linkto]'
+		return 2
+	oldtree, newtree = sys.argv[1], sys.argv[2]
+	if len(sys.argv) > 3:
+		link = sys.argv[3]
+		link_may_fail = 1
+	else:
+		link = LINK
+		link_may_fail = 0
+	if not path.isdir(oldtree):
+		print oldtree + ': not a directory'
+		return 1
+	try:
+		posix.mkdir(newtree, 0777)
+	except posix.error, msg:
+		print newtree + ': cannot mkdir:', msg
+		return 1
+	linkname = path.cat(newtree, link)
+	try:
+		posix.symlink(path.cat('..', oldtree), linkname)
+	except posix.error, msg:
+		if not link_may_fail:
+			print linkname + ': cannot symlink:', msg
+			return 1
+		else:
+			print linkname + ': warning: cannot symlink:', msg
+	linknames(oldtree, newtree, link)
+	return 0
+
+def linknames(old, new, link):
+	if debug: print 'linknames', (old, new, link)
+	try:
+		names = posix.listdir(old)
+	except posix.error, msg:
+		print old + ': warning: cannot listdir:', msg
+		return
+	for name in names:
+	    if name not in ('.', '..'):
+		oldname = path.cat(old, name)
+		linkname = path.cat(link, name)
+		newname = path.cat(new, name)
+		if debug > 1: print oldname, newname, linkname
+		if path.isdir(oldname) and not path.islink(oldname):
+			try:
+				posix.mkdir(newname, 0777)
+				ok = 1
+			except:
+				print newname + ': warning: cannot mkdir:', msg
+				ok = 0
+			if ok:
+				linkname = path.cat('..', linkname)
+				linknames(oldname, newname, linkname)
+		else:
+			posix.symlink(linkname, newname)
+
+sys.exit(main())