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Ruby で setuid, setgid を 設定, 解除する

Last updated at Posted at 2018-01-05

Ruby で setuid, setgid を設定, 解除する

サンプル

setuid

require 'fileutils'

IO.write("testfile", "")
# setuid を設定
FileUtils.chmod("u+s", "testfile")
printf "%o\n", File.stat("testfile").mode # => 104755
p FileTest.setuid?("testfile")            # => true
# setuid を解除
FileUtils.chmod("u-s", "testfile")
printf "%o\n", File.stat("testfile").mode # => 100755
p FileTest.setuid?("testfile")            # => false

setgid

require 'fileutils'

IO.write("testfile", "")
# setgid を設定
FileUtils.chmod("g+s", "testfile")
printf "%o\n", File.stat("testfile").mode # => 102755
p FileTest.setgid?("testfile")            # => true
# setgid を解除
FileUtils.chmod("g-s", "testfile")
printf "%o\n", File.stat("testfile").mode # => 100755
p FileTest.setgid?("testfile")            # => false

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