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81 lines
2.4 KiB
81 lines
2.4 KiB
6 years ago
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#! /usr/bin/env python3
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# linktree
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#
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# Make a copy of a directory tree with symbolic links to all files in the
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# original tree.
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# All symbolic links go to a special symbolic link at the top, so you
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# can easily fix things if the original source tree moves.
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# See also "mkreal".
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#
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# usage: mklinks oldtree newtree
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import sys, os
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LINK = '.LINK' # Name of special symlink at the top.
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debug = 0
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def main():
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if not 3 <= len(sys.argv) <= 4:
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print('usage:', sys.argv[0], 'oldtree newtree [linkto]')
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return 2
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oldtree, newtree = sys.argv[1], sys.argv[2]
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if len(sys.argv) > 3:
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link = sys.argv[3]
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link_may_fail = 1
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else:
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link = LINK
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link_may_fail = 0
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if not os.path.isdir(oldtree):
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print(oldtree + ': not a directory')
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return 1
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try:
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os.mkdir(newtree, 0o777)
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except OSError as msg:
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print(newtree + ': cannot mkdir:', msg)
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return 1
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linkname = os.path.join(newtree, link)
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try:
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os.symlink(os.path.join(os.pardir, oldtree), linkname)
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except OSError as msg:
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if not link_may_fail:
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print(linkname + ': cannot symlink:', msg)
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return 1
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else:
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print(linkname + ': warning: cannot symlink:', msg)
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linknames(oldtree, newtree, link)
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return 0
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def linknames(old, new, link):
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if debug: print('linknames', (old, new, link))
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try:
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names = os.listdir(old)
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except OSError as msg:
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print(old + ': warning: cannot listdir:', msg)
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return
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for name in names:
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if name not in (os.curdir, os.pardir):
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oldname = os.path.join(old, name)
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linkname = os.path.join(link, name)
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newname = os.path.join(new, name)
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if debug > 1: print(oldname, newname, linkname)
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if os.path.isdir(oldname) and \
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not os.path.islink(oldname):
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try:
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os.mkdir(newname, 0o777)
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ok = 1
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except:
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print(newname + \
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': warning: cannot mkdir:', msg)
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ok = 0
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if ok:
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linkname = os.path.join(os.pardir,
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linkname)
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linknames(oldname, newname, linkname)
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else:
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os.symlink(linkname, newname)
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if __name__ == '__main__':
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sys.exit(main())
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