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Added a comment: single-line migration

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http://christian.amsuess.com/chrysn 2012-11-22 03:14:45 +00:00 committed by admin
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[[!comment format=mdwn
username="http://christian.amsuess.com/chrysn"
nickname="chrysn"
subject="single-line migration"
date="2012-11-22T03:14:45Z"
content="""
i've successfully applied this monster to migrate my repository (as always with such expressions, use it only if you know what it does, and have a backup):
find . -path './??/??/*' -type d \( -exec python -c 'import sys, hashlib, os; hash = hashlib.md5(sys.argv[1][8:]).hexdigest(); h1 = hash[:3]; h2 = hash[3:6]; os.mkdir(h1) if not os.path.exists(h1) else None; os.mkdir(h1+\"/\"+h2) if not os.path.exists(h1+\"/\"+h2) else None; os.rename(sys.argv[1], h1+\"/\"+h2+\"/\"+sys.argv[1][8:])' '{}' ';' -o -print \) -prune
when executed in an encrypted git annex object directory, it takes all two-letter directories, executes a python expression on them (in case of failure, printing the file name it failed on), and doesn't continue searching there (-prune avoids error messages about moved-away directories).
the python expression itself generates the hash described above, generates the required directories (put awkwardly in an `a if b else c` expression to avoid ifs (which wouldn't fit in a single line) and because python still doesn't have a proper mkdir-p function), and moves the found object there. (nb: using the system's `mkdir -p` would trigger [[another bug|bugs/using_old_remote_format_generates_irritating_output]]).
"""]]