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leifericf/git-hash.rb

Last active August 29, 2015 14:03
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Generate Git file (aka "blob") hash, without using Git.
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git-hash.rb
#!/usr/bin/env ruby
require 'digest/sha1'
def git_hash(file)
data = File.read(file)
size = data.bytesize.to_s
Digest::SHA1.hexdigest('blob ' + size + "\0" + data) # Git's hashing algorithm
end
puts git_hash(ARGV[0])
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