Copy a directory to a temp directory temporarily to perform mutations, to then copy it back.
If any exceptions are raised within the block, the changes will not be copied back.
# Will create `a`, `b`, `c` in `/my/path`
File.transaction("/my/path") do |dir|
FileUtils.touch(dir.join("a"))
FileUtils.touch(dir.join("b"))
system("echo 'c' >#{dir}/c")
end
# Will make no changes to `/my/path`
File.transaction("/my/path") do |dir|
FileUtils.touch(dir.join("a"))
FileUtils.touch(dir.join("b"))
system("echo 'c' >#{dir}/c")
raise "Any error" # <-------------
end
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