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The contents of the .gitattributes files may evolve over time, but "git check-attr" always checks attributes against them in the working tree and/or in the index. It may be beneficial to optionally allow the users to check attributes taken from a commit other than HEAD against paths. Add a new flag `--source` which will allow users to check the attributes against a commit (actually any tree-ish would do). When the user uses this flag, we go through the stack of .gitattributes files but instead of checking the current working tree and/or in the index, we check the blobs from the provided tree-ish object. This allows the command to also be used in bare repositories. Since we use a tree-ish object, the user can pass "--source HEAD:subdirectory" and all the attributes will be looked up as if subdirectory was the root directory of the repository. We cannot simply use the `<rev>:<path>` syntax without the `--source` flag, similar to how it is used in `git show` because any non-flag parameter before `--` is treated as an attribute and any parameter after `--` is treated as a pathname. The change involves creating a new function `read_attr_from_blob`, which given the path reads the blob for the path against the provided source and parses the attributes line by line. This function is plugged into `read_attr()` function wherein we go through the stack of attributes files. Signed-off-by: Karthik Nayak <karthik.188@gmail.com> Signed-off-by: Toon Claes <toon@iotcl.com> Co-authored-by: toon@iotcl.com Signed-off-by: Junio C Hamano <gitster@pobox.com>
126 lines
3.3 KiB
Plaintext
126 lines
3.3 KiB
Plaintext
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' [--source <tree-ish>] [-a | --all | <attr>...] [--] <pathname>...
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'git check-attr' --stdin [-z] [--source <tree-ish>] [-a | --all | <attr>...]
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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 pathnames from the standard input, one per line,
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instead of from the command-line.
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-z::
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The output format is modified to be machine-parsable.
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If `--stdin` is also given, input paths are separated
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with a NUL character instead of a linefeed character.
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--source=<tree-ish>::
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Check attributes against the specified tree-ish. It is common to
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specify the source tree by naming a commit, branch or tag associated
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with it.
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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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unless `-z` is in effect, in which case NUL is used as delimiter:
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<path> NUL <attribute> NUL <info> NUL
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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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