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/tmp の代わりに Dir.tmpdir 相当を使う

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ブロックの中では単純には set できないので lambda を使ったり capture を使ったり入っていないかもしれない ruby コマンドは使わずに printenv を使ったり工夫した。

config/deploy.rb
set :tmp_dir, -> {
  tmpdir = nil
  on roles(:all) do
    tmpdir = capture('printenv TMPDIR || printenv TMP || printenv TEMP || echo /tmp').chomp
  end
  tmpdir
}
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