mirror of
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f1ed7fea79
check-attr and check-ignore have the potential to deadlock callers
which do not read back the output in real-time. For example, if a
caller writes N paths out and then reads N lines back in, it risks
becoming blocked on write() to check-*, and check-* is blocked on
write back to the caller. Somebody has to buffer; the pipe buffers
provide some leeway, but they are limited.
Thanks to Peff for pointing this out:
http://article.gmane.org/gmane.comp.version-control.git/220534
Signed-off-by: Adam Spiers <git@adamspiers.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
114 lines
2.9 KiB
Text
114 lines
2.9 KiB
Text
git-check-attr(1)
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=================
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NAME
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----
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git-check-attr - Display gitattributes information
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SYNOPSIS
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--------
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[verse]
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'git check-attr' [-a | --all | attr...] [--] pathname...
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'git check-attr' --stdin [-z] [-a | --all | attr...] < <list-of-paths>
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DESCRIPTION
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-----------
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For every pathname, this command will list if each attribute is 'unspecified',
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'set', or 'unset' as a gitattribute on that pathname.
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OPTIONS
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-------
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-a, --all::
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List all attributes that are associated with the specified
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paths. If this option is used, then 'unspecified' attributes
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will not be included in the output.
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--cached::
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Consider `.gitattributes` in the index only, ignoring the working tree.
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--stdin::
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Read file names from stdin instead of from the command-line.
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-z::
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Only meaningful with `--stdin`; paths are separated with a
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NUL character instead of a linefeed character.
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\--::
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Interpret all preceding arguments as attributes and all following
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arguments as path names.
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If none of `--stdin`, `--all`, or `--` is used, the first argument
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will be treated as an attribute and the rest of the arguments as
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pathnames.
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OUTPUT
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------
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The output is of the form:
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<path> COLON SP <attribute> COLON SP <info> LF
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<path> is the path of a file being queried, <attribute> is an attribute
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being queried and <info> can be either:
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'unspecified';; when the attribute is not defined for the path.
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'unset';; when the attribute is defined as false.
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'set';; when the attribute is defined as true.
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<value>;; when a value has been assigned to the attribute.
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Buffering happens as documented under the `GIT_FLUSH` option in
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linkgit:git[1]. The caller is responsible for avoiding deadlocks
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caused by overfilling an input buffer or reading from an empty output
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buffer.
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EXAMPLES
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--------
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In the examples, the following '.gitattributes' file is used:
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---------------
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*.java diff=java -crlf myAttr
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NoMyAttr.java !myAttr
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README caveat=unspecified
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---------------
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* Listing a single attribute:
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---------------
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$ git check-attr diff org/example/MyClass.java
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org/example/MyClass.java: diff: java
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---------------
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* Listing multiple attributes for a file:
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---------------
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$ git check-attr crlf diff myAttr -- org/example/MyClass.java
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org/example/MyClass.java: crlf: unset
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org/example/MyClass.java: diff: java
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org/example/MyClass.java: myAttr: set
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---------------
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* Listing all attributes for a file:
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---------------
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$ git check-attr --all -- org/example/MyClass.java
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org/example/MyClass.java: diff: java
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org/example/MyClass.java: myAttr: set
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---------------
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* Listing an attribute for multiple files:
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---------------
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$ git check-attr myAttr -- org/example/MyClass.java org/example/NoMyAttr.java
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org/example/MyClass.java: myAttr: set
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org/example/NoMyAttr.java: myAttr: unspecified
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---------------
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* Not all values are equally unambiguous:
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---------------
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$ git check-attr caveat README
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README: caveat: unspecified
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---------------
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SEE ALSO
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--------
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linkgit:gitattributes[5].
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GIT
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---
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Part of the linkgit:git[1] suite
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