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Fix tests broken for the wrong reasons
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| # frozen_string_literal: true | ||
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| module TarTestHelpers | ||
| private | ||
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| module Constants | ||
| FIELDS = { | ||
| 'name' => 100, | ||
| 'mode' => 8, | ||
| 'uid' => 8, | ||
| 'gid' => 8, | ||
| 'size' => 12, | ||
| 'mtime' => 12, | ||
| 'checksum' => 8, | ||
| 'typeflag' => 1, | ||
| 'linkname' => 100, | ||
| 'magic' => 6, | ||
| 'version' => 2, | ||
| 'uname' => 32, | ||
| 'gname' => 32, | ||
| 'devmajor' => 8, | ||
| 'devminor' => 8, | ||
| 'prefix' => 155 | ||
| } | ||
|
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| BLANK_CHECKSUM = " " * 8 | ||
| CHECKSUM_OFFSET = FIELDS.keys.inject(0) { |length, field| | ||
| break length if field == 'checksum' | ||
| length + FIELDS[field] | ||
| } | ||
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| NULL_100 = "\0" * 100 | ||
| USTAR = "ustar\0" | ||
| DOUBLE_ZERO = "00" | ||
| end | ||
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| def assert_headers_equal(expected, actual) | ||
| offset = 0 | ||
| Constants::FIELDS.each do |field, length| | ||
| message = if field == 'checksum' | ||
| "Header checksums are expected to match." | ||
| else | ||
| "Header field #{field} is expected to match." | ||
| end | ||
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| assert_equal(expected[offset, length], actual[offset, length], message) | ||
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| offset += length | ||
| end | ||
| end | ||
|
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| def assert_modes_equal(expected, actual, name) | ||
| return if Minitar.windows? | ||
|
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| assert_equal( | ||
| mode_string(expected), | ||
| mode_string(actual), | ||
| "Mode for #{name} does not match" | ||
| ) | ||
| end | ||
|
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| def tar_file_header(fname, dname, mode, length) | ||
| update_checksum(header("0", fname, dname, length, mode)) | ||
| end | ||
|
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| def tar_dir_header(name, prefix, mode) | ||
| update_checksum(header("5", name, prefix, 0, mode)) | ||
| end | ||
|
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| def header(type, fname, dname, length, mode) | ||
| checksum ||= Constants::BLANK_CHECKSUM | ||
| arr = [ | ||
| asciiz(fname, 100), z(to_oct(mode, 7)), z(to_oct(nil, 7)), | ||
| z(to_oct(nil, 7)), z(to_oct(length, 11)), z(to_oct(0, 11)), | ||
| Constants::BLANK_CHECKSUM, type, Constants::NULL_100, Constants::USTAR, | ||
| Constants::DOUBLE_ZERO, asciiz("", 32), asciiz("", 32), | ||
| z(to_oct(nil, 7)), z(to_oct(nil, 7)), asciiz(dname, 155) | ||
| ] | ||
| h = arr.join.bytes.to_a.pack("C100C8C8C8C12C12C8CC100C6C2C32C32C8C8C155") | ||
| ret = h + "\0" * (512 - h.size) | ||
| assert_equal(512, ret.size) | ||
| ret | ||
| end | ||
|
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| def update_checksum(header) | ||
| header[Constants::CHECKSUM_OFFSET, Constants::FIELDS['checksum']] = | ||
| # inject(:+) was introduced in which version? | ||
| sp(z(to_oct(header.unpack("C*").inject { |s, a| s + a }, 6))) | ||
| header | ||
| end | ||
|
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| def to_oct(n, pad_size) | ||
| if n.nil? | ||
| "\0" * pad_size | ||
| else | ||
| "%0#{pad_size}o" % n | ||
| end | ||
| end | ||
|
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| def asciiz(str, length) | ||
| str + "\0" * (length - str.length) | ||
| end | ||
|
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| def sp(s) | ||
| s + " " | ||
| end | ||
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| def z(s) | ||
| s + "\0" | ||
| end | ||
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| def mode_string(value) | ||
| "%04o" % (value & 0777) | ||
| end | ||
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| Minitest::Test.send(:include, self) | ||
| end |