| #! /usr/bin/env python3 |
| |
| # 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, os |
| |
| 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 os.path.isdir(oldtree): |
| print(oldtree + ': not a directory') |
| return 1 |
| try: |
| os.mkdir(newtree, 0o777) |
| except os.error as msg: |
| print(newtree + ': cannot mkdir:', msg) |
| return 1 |
| linkname = os.path.join(newtree, link) |
| try: |
| os.symlink(os.path.join(os.pardir, oldtree), linkname) |
| except os.error as 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 = os.listdir(old) |
| except os.error as msg: |
| print(old + ': warning: cannot listdir:', msg) |
| return |
| for name in names: |
| if name not in (os.curdir, os.pardir): |
| oldname = os.path.join(old, name) |
| linkname = os.path.join(link, name) |
| newname = os.path.join(new, name) |
| if debug > 1: print(oldname, newname, linkname) |
| if os.path.isdir(oldname) and \ |
| not os.path.islink(oldname): |
| try: |
| os.mkdir(newname, 0o777) |
| ok = 1 |
| except: |
| print(newname + \ |
| ': warning: cannot mkdir:', msg) |
| ok = 0 |
| if ok: |
| linkname = os.path.join(os.pardir, |
| linkname) |
| linknames(oldname, newname, linkname) |
| else: |
| os.symlink(linkname, newname) |
| |
| if __name__ == '__main__': |
| sys.exit(main()) |