Created
April 2, 2010 00:54
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brute-force history rewriting for dm adapters
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#!/usr/bin/ruby | |
# rewrite_history.rb | |
# Jonathan D. Stott <jonathan.stott@gmail.com> | |
require 'fileutils' | |
adapters = %w{ | |
mysql_adapter.rb | |
postgres_adapter.rb | |
sqlite3_adapter.rb | |
oracle_adapter.rb | |
sqlserver_adapter.rb | |
abstract_adapter.rb | |
data_objects_adapter.rb | |
in_memory_adapter.rb | |
yaml_adapter.rb | |
} | |
def sh(command) | |
system command || abort(command) | |
end | |
adapters.each do |adapter| | |
puts adapter | |
name = adapter.split('_').first | |
dirname = "/home/jon/tmp/dm-#{name}-adapter" # this is a ramdrive, for speed. | |
# create a clone | |
sh "git clone --quiet --no-hardlinks dm-core #{dirname}" | |
FileUtils.cd dirname do | |
# rewrite to subdir | |
sh "git filter-branch --prune-empty --subdirectory-filter lib/dm-core/adapters HEAD -- --all" | |
# now, successively rewrite by removing all but our adapter | |
to_go = adapters - [adapter] | |
sh "git filter-branch --force --prune-empty --index-filter 'git rm --cached --ignore-unmatch #{to_go.join(" ")}' HEAD" | |
# clean up after our butchery! | |
sh "git reset --hard" | |
sh "git prune" | |
sh "git gc --aggressive" | |
sh "git prune" | |
sh "git fsck" | |
end | |
FileUtils.mv dirname, Dir.pwd | |
end |
Oh, I figured that. A slightly less ugly version would have had 'adapters' and 'adapters_to_create'.
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The In-Memory adapter probably doesn't have to be split out, it's the only one staying in dm-core