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Tianon Gravi 05c2d2db9a Adjust builder to validate that JSON in Dockerfiles are arrays of strings and nothing else to match how we describe them to people (and what all our existing tests already assumed)

This also adds more tests to help verify this, including unicode and nonprintable characters (hence the earlier commit switching to strconv.Quote).

As a bonus, this fixes a subtle bug where [] was turned into [""] and then turned back into [] (and thus [""] was impossible to actually round-trip correctly in a Dockerfile).

Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>

2015-01-05 14:31:05 -07:00

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 CMD []
 CMD [""]
 CMD ["a"]
 CMD ["a","b"]
 CMD [ "a", "b" ]
 CMD [	"a",	"b"	]
 CMD	[	"a",	"b"	]
 CMD ["abc 123", "♥", "☃", "\" \\ \/ \b \f \n \r \t \u0000"]