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Documentation/i18n.txt: clarify character encoding support
As a "distributed" VCS, git should better define the encodings of its core textual data structures, in particular those that are part of the network protocol. That git is encoding agnostic is only really true for blob objects. E.g. the 'non-NUL bytes' requirement of tree and commit objects excludes UTF-16/32, and the special meaning of '/' in the index file as well as space and linefeed in commit objects eliminates EBCDIC and other non-ASCII encodings. Git expects bytes < 0x80 to be pure ASCII, thus CJK encodings that partly overlap with the ASCII range are problematic as well. E.g. fmt_ident() removes trailing 0x5C from user names on the assumption that it is ASCII '\'. However, there are over 200 GBK double byte codes that end in 0x5C. UTF-8 as default encoding on Linux and respective path translations in the Mac and Windows versions have established UTF-8 NFC as de-facto standard for path names. Update the documentation in i18n.txt to reflect the current status-quo. Signed-off-by: Karsten Blees <blees@dcon.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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At the core level, Git is character encoding agnostic.
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Git is to some extent character encoding agnostic.
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- The pathnames recorded in the index and in the tree objects
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are treated as uninterpreted sequences of non-NUL bytes.
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What readdir(2) returns are what are recorded and compared
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with the data Git keeps track of, which in turn are expected
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to be what lstat(2) and creat(2) accepts. There is no such
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thing as pathname encoding translation.
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- The contents of the blob objects are uninterpreted sequences
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- The contents of the blob objects are uninterpreted sequences
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of bytes. There is no encoding translation at the core
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of bytes. There is no encoding translation at the core
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level.
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level.
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- The commit log messages are uninterpreted sequences of non-NUL
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- Path names are encoded in UTF-8 normalization form C. This
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bytes.
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applies to tree objects, the index file, ref names, as well as
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path names in command line arguments, environment variables
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and config files (`.git/config` (see linkgit:git-config[1]),
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linkgit:gitignore[5], linkgit:gitattributes[5] and
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linkgit:gitmodules[5]).
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+
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Note that Git at the core level treats path names simply as
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sequences of non-NUL bytes, there are no path name encoding
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conversions (except on Mac and Windows). Therefore, using
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non-ASCII path names will mostly work even on platforms and file
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systems that use legacy extended ASCII encodings. However,
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repositories created on such systems will not work properly on
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UTF-8-based systems (e.g. Linux, Mac, Windows) and vice versa.
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Additionally, many Git-based tools simply assume path names to
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be UTF-8 and will fail to display other encodings correctly.
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- Commit log messages are typically encoded in UTF-8, but other
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extended ASCII encodings are also supported. This includes
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ISO-8859-x, CP125x and many others, but _not_ UTF-16/32,
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EBCDIC and CJK multi-byte encodings (GBK, Shift-JIS, Big5,
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EUC-x, CP9xx etc.).
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Although we encourage that the commit log messages are encoded
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Although we encourage that the commit log messages are encoded
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in UTF-8, both the core and Git Porcelain are designed not to
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in UTF-8, both the core and Git Porcelain are designed not to
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