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GITATTRIBUTES(5)		  Git Manual		      GITATTRIBUTES(5)

NAME
       gitattributes - defining attributes per path

SYNOPSIS
       $GIT_DIR/info/attributes, .gitattributes

DESCRIPTION
       A gitattributes file is a simple text file that gives attributes to
       pathnames.

       Each line in gitattributes file is of form:

	   pattern attr1 attr2 ...

       That is, a pattern followed by an attributes list, separated by
       whitespaces. When the pattern matches the path in question, the
       attributes listed on the line are given to the path.

       Each attribute can be in one of these states for a given path:

       Set
	   The path has the attribute with special value "true"; this is
	   specified by listing only the name of the attribute in the
	   attribute list.

       Unset
	   The path has the attribute with special value "false"; this is
	   specified by listing the name of the attribute prefixed with a dash
	   - in the attribute list.

       Set to a value
	   The path has the attribute with specified string value; this is
	   specified by listing the name of the attribute followed by an equal
	   sign = and its value in the attribute list.

       Unspecified
	   No pattern matches the path, and nothing says if the path has or
	   does not have the attribute, the attribute for the path is said to
	   be Unspecified.

       When more than one pattern matches the path, a later line overrides an
       earlier line. This overriding is done per attribute. The rules how the
       pattern matches paths are the same as in .gitignore files; see
       gitignore(5). Unlike .gitignore, negative patterns are forbidden.

       When deciding what attributes are assigned to a path, Git consults
       $GIT_DIR/info/attributes file (which has the highest precedence),
       .gitattributes file in the same directory as the path in question, and
       its parent directories up to the toplevel of the work tree (the further
       the directory that contains .gitattributes is from the path in
       question, the lower its precedence). Finally global and system-wide
       files are considered (they have the lowest precedence).

       When the .gitattributes file is missing from the work tree, the path in
       the index is used as a fall-back. During checkout process,
       .gitattributes in the index is used and then the file in the working
       tree is used as a fall-back.

       If you wish to affect only a single repository (i.e., to assign
       attributes to files that are particular to one user’s workflow for that
       repository), then attributes should be placed in the
       $GIT_DIR/info/attributes file. Attributes which should be
       version-controlled and distributed to other repositories (i.e.,
       attributes of interest to all users) should go into .gitattributes
       files. Attributes that should affect all repositories for a single user
       should be placed in a file specified by the core.attributesfile
       configuration option (see git-config(1)). Its default value is
       $XDG_CONFIG_HOME/git/attributes. If $XDG_CONFIG_HOME is either not set
       or empty, $HOME/.config/git/attributes is used instead. Attributes for
       all users on a system should be placed in the
       $(prefix)/etc/gitattributes file.

       Sometimes you would need to override an setting of an attribute for a
       path to Unspecified state. This can be done by listing the name of the
       attribute prefixed with an exclamation point !.

EFFECTS
       Certain operations by Git can be influenced by assigning particular
       attributes to a path. Currently, the following operations are
       attributes-aware.

   Checking-out and checking-in
       These attributes affect how the contents stored in the repository are
       copied to the working tree files when commands such as git checkout and
       git merge run. They also affect how Git stores the contents you prepare
       in the working tree in the repository upon git add and git commit.

       text
	   This attribute enables and controls end-of-line normalization. When
	   a text file is normalized, its line endings are converted to LF in
	   the repository. To control what line ending style is used in the
	   working directory, use the eol attribute for a single file and the
	   core.eol configuration variable for all text files.

	   Set
	       Setting the text attribute on a path enables end-of-line
	       normalization and marks the path as a text file. End-of-line
	       conversion takes place without guessing the content type.

	   Unset
	       Unsetting the text attribute on a path tells Git not to attempt
	       any end-of-line conversion upon checkin or checkout.

	   Set to string value "auto"
	       When text is set to "auto", the path is marked for automatic
	       end-of-line normalization. If Git decides that the content is
	       text, its line endings are normalized to LF on checkin.

	   Unspecified
	       If the text attribute is unspecified, Git uses the
	       core.autocrlf configuration variable to determine if the file
	       should be converted.

	   Any other value causes Git to act as if text has been left
	   unspecified.

       eol
	   This attribute sets a specific line-ending style to be used in the
	   working directory. It enables end-of-line normalization without any
	   content checks, effectively setting the text attribute.

	   Set to string value "crlf"
	       This setting forces Git to normalize line endings for this file
	       on checkin and convert them to CRLF when the file is checked
	       out.

	   Set to string value "lf"
	       This setting forces Git to normalize line endings to LF on
	       checkin and prevents conversion to CRLF when the file is
	       checked out.

       Backwards compatibility with crlf attribute
	   For backwards compatibility, the crlf attribute is interpreted as
	   follows:

	       crlf	       text
	       -crlf	       -text
	       crlf=input      eol=lf

       End-of-line conversion
	   While Git normally leaves file contents alone, it can be configured
	   to normalize line endings to LF in the repository and, optionally,
	   to convert them to CRLF when files are checked out.

	   Here is an example that will make Git normalize .txt, .vcproj and
	   .sh files, ensure that .vcproj files have CRLF and .sh files have
	   LF in the working directory, and prevent .jpg files from being
	   normalized regardless of their content.

	       *.txt	       text
	       *.vcproj	       eol=crlf
	       *.sh	       eol=lf
	       *.jpg	       -text

	   Other source code management systems normalize all text files in
	   their repositories, and there are two ways to enable similar
	   automatic normalization in Git.

	   If you simply want to have CRLF line endings in your working
	   directory regardless of the repository you are working with, you
	   can set the config variable "core.autocrlf" without changing any
	   attributes.

	       [core]
		       autocrlf = true

	   This does not force normalization of all text files, but does
	   ensure that text files that you introduce to the repository have
	   their line endings normalized to LF when they are added, and that
	   files that are already normalized in the repository stay
	   normalized.

	   If you want to interoperate with a source code management system
	   that enforces end-of-line normalization, or you simply want all
	   text files in your repository to be normalized, you should instead
	   set the text attribute to "auto" for all files.

	       *       text=auto

	   This ensures that all files that Git considers to be text will have
	   normalized (LF) line endings in the repository. The core.eol
	   configuration variable controls which line endings Git will use for
	   normalized files in your working directory; the default is to use
	   the native line ending for your platform, or CRLF if core.autocrlf
	   is set.

	       Note
	       When text=auto normalization is enabled in an existing
	       repository, any text files containing CRLFs should be
	       normalized. If they are not they will be normalized the next
	       time someone tries to change them, causing unfortunate
	       misattribution. From a clean working directory:

	       $ echo "* text=auto" >>.gitattributes
	       $ rm .git/index	   # Remove the index to force Git to
	       $ git reset	   # re-scan the working directory
	       $ git status	   # Show files that will be normalized
	       $ git add -u
	       $ git add .gitattributes
	       $ git commit -m "Introduce end-of-line normalization"

	   If any files that should not be normalized show up in git status,
	   unset their text attribute before running git add -u.

	       manual.pdf      -text

	   Conversely, text files that Git does not detect can have
	   normalization enabled manually.

	       weirdchars.txt  text

	   If core.safecrlf is set to "true" or "warn", Git verifies if the
	   conversion is reversible for the current setting of core.autocrlf.
	   For "true", Git rejects irreversible conversions; for "warn", Git
	   only prints a warning but accepts an irreversible conversion. The
	   safety triggers to prevent such a conversion done to the files in
	   the work tree, but there are a few exceptions. Even though...

	   ·   git add itself does not touch the files in the work tree, the
	       next checkout would, so the safety triggers;

	   ·   git apply to update a text file with a patch does touch the
	       files in the work tree, but the operation is about text files
	       and CRLF conversion is about fixing the line ending
	       inconsistencies, so the safety does not trigger;

	   ·   git diff itself does not touch the files in the work tree, it
	       is often run to inspect the changes you intend to next git add.
	       To catch potential problems early, safety triggers.

       ident
	   When the attribute ident is set for a path, Git replaces $Id$ in
	   the blob object with $Id:, followed by the 40-character hexadecimal
	   blob object name, followed by a dollar sign $ upon checkout. Any
	   byte sequence that begins with $Id: and ends with $ in the worktree
	   file is replaced with $Id$ upon check-in.

       filter
	   A filter attribute can be set to a string value that names a filter
	   driver specified in the configuration.

	   A filter driver consists of a clean command and a smudge command,
	   either of which can be left unspecified. Upon checkout, when the
	   smudge command is specified, the command is fed the blob object
	   from its standard input, and its standard output is used to update
	   the worktree file. Similarly, the clean command is used to convert
	   the contents of worktree file upon checkin.

	   One use of the content filtering is to massage the content into a
	   shape that is more convenient for the platform, filesystem, and the
	   user to use. For this mode of operation, the key phrase here is
	   "more convenient" and not "turning something unusable into usable".
	   In other words, the intent is that if someone unsets the filter
	   driver definition, or does not have the appropriate filter program,
	   the project should still be usable.

	   Another use of the content filtering is to store the content that
	   cannot be directly used in the repository (e.g. a UUID that refers
	   to the true content stored outside Git, or an encrypted content)
	   and turn it into a usable form upon checkout (e.g. download the
	   external content, or decrypt the encrypted content).

	   These two filters behave differently, and by default, a filter is
	   taken as the former, massaging the contents into more convenient
	   shape. A missing filter driver definition in the config, or a
	   filter driver that exits with a non-zero status, is not an error
	   but makes the filter a no-op passthru.

	   You can declare that a filter turns a content that by itself is
	   unusable into a usable content by setting the
	   filter.<driver>.required configuration variable to true.

	   For example, in .gitattributes, you would assign the filter
	   attribute for paths.

	       *.c     filter=indent

	   Then you would define a "filter.indent.clean" and
	   "filter.indent.smudge" configuration in your .git/config to specify
	   a pair of commands to modify the contents of C programs when the
	   source files are checked in ("clean" is run) and checked out (no
	   change is made because the command is "cat").

	       [filter "indent"]
		       clean = indent
		       smudge = cat

	   For best results, clean should not alter its output further if it
	   is run twice ("clean→clean" should be equivalent to "clean"), and
	   multiple smudge commands should not alter clean's output
	   ("smudge→smudge→clean" should be equivalent to "clean"). See the
	   section on merging below.

	   The "indent" filter is well-behaved in this regard: it will not
	   modify input that is already correctly indented. In this case, the
	   lack of a smudge filter means that the clean filter must accept its
	   own output without modifying it.

	   If a filter must succeed in order to make the stored contents
	   usable, you can declare that the filter is required, in the
	   configuration:

	       [filter "crypt"]
		       clean = openssl enc ...
		       smudge = openssl enc -d ...
		       required

	   Sequence "%f" on the filter command line is replaced with the name
	   of the file the filter is working on. A filter might use this in
	   keyword substitution. For example:

	       [filter "p4"]
		       clean = git-p4-filter --clean %f
		       smudge = git-p4-filter --smudge %f

       Interaction between checkin/checkout attributes
	   In the check-in codepath, the worktree file is first converted with
	   filter driver (if specified and corresponding driver defined), then
	   the result is processed with ident (if specified), and then finally
	   with text (again, if specified and applicable).

	   In the check-out codepath, the blob content is first converted with
	   text, and then ident and fed to filter.

       Merging branches with differing checkin/checkout attributes
	   If you have added attributes to a file that cause the canonical
	   repository format for that file to change, such as adding a
	   clean/smudge filter or text/eol/ident attributes, merging anything
	   where the attribute is not in place would normally cause merge
	   conflicts.

	   To prevent these unnecessary merge conflicts, Git can be told to
	   run a virtual check-out and check-in of all three stages of a file
	   when resolving a three-way merge by setting the merge.renormalize
	   configuration variable. This prevents changes caused by check-in
	   conversion from causing spurious merge conflicts when a converted
	   file is merged with an unconverted file.

	   As long as a "smudge→clean" results in the same output as a "clean"
	   even on files that are already smudged, this strategy will
	   automatically resolve all filter-related conflicts. Filters that do
	   not act in this way may cause additional merge conflicts that must
	   be resolved manually.

   Generating diff text
       diff
	   The attribute diff affects how Git generates diffs for particular
	   files. It can tell Git whether to generate a textual patch for the
	   path or to treat the path as a binary file. It can also affect what
	   line is shown on the hunk header @@ -k,l +n,m @@ line, tell Git to
	   use an external command to generate the diff, or ask Git to convert
	   binary files to a text format before generating the diff.

	   Set
	       A path to which the diff attribute is set is treated as text,
	       even when they contain byte values that normally never appear
	       in text files, such as NUL.

	   Unset
	       A path to which the diff attribute is unset will generate
	       Binary files differ (or a binary patch, if binary patches are
	       enabled).

	   Unspecified
	       A path to which the diff attribute is unspecified first gets
	       its contents inspected, and if it looks like text, it is
	       treated as text. Otherwise it would generate Binary files
	       differ.

	   String
	       Diff is shown using the specified diff driver. Each driver may
	       specify one or more options, as described in the following
	       section. The options for the diff driver "foo" are defined by
	       the configuration variables in the "diff.foo" section of the
	       Git config file.

       Defining an external diff driver
	   The definition of a diff driver is done in gitconfig, not
	   gitattributes file, so strictly speaking this manual page is a
	   wrong place to talk about it. However...

	   To define an external diff driver jcdiff, add a section to your
	   $GIT_DIR/config file (or $HOME/.gitconfig file) like this:

	       [diff "jcdiff"]
		       command = j-c-diff

	   When Git needs to show you a diff for the path with diff attribute
	   set to jcdiff, it calls the command you specified with the above
	   configuration, i.e. j-c-diff, with 7 parameters, just like
	   GIT_EXTERNAL_DIFF program is called. See git(1) for details.

       Defining a custom hunk-header
	   Each group of changes (called a "hunk") in the textual diff output
	   is prefixed with a line of the form:

	       @@ -k,l +n,m @@ TEXT

	   This is called a hunk header. The "TEXT" portion is by default a
	   line that begins with an alphabet, an underscore or a dollar sign;
	   this matches what GNU diff -p output uses. This default selection
	   however is not suited for some contents, and you can use a
	   customized pattern to make a selection.

	   First, in .gitattributes, you would assign the diff attribute for
	   paths.

	       *.tex   diff=tex

	   Then, you would define a "diff.tex.xfuncname" configuration to
	   specify a regular expression that matches a line that you would
	   want to appear as the hunk header "TEXT". Add a section to your
	   $GIT_DIR/config file (or $HOME/.gitconfig file) like this:

	       [diff "tex"]
		       xfuncname = "^(\\\\(sub)*section\\{.*)$"

	   Note. A single level of backslashes are eaten by the configuration
	   file parser, so you would need to double the backslashes; the
	   pattern above picks a line that begins with a backslash, and zero
	   or more occurrences of sub followed by section followed by open
	   brace, to the end of line.

	   There are a few built-in patterns to make this easier, and tex is
	   one of them, so you do not have to write the above in your
	   configuration file (you still need to enable this with the
	   attribute mechanism, via .gitattributes). The following built in
	   patterns are available:

	   ·   ada suitable for source code in the Ada language.

	   ·   bibtex suitable for files with BibTeX coded references.

	   ·   cpp suitable for source code in the C and C++ languages.

	   ·   csharp suitable for source code in the C# language.

	   ·   fortran suitable for source code in the Fortran language.

	   ·   html suitable for HTML/XHTML documents.

	   ·   java suitable for source code in the Java language.

	   ·   matlab suitable for source code in the MATLAB language.

	   ·   objc suitable for source code in the Objective-C language.

	   ·   pascal suitable for source code in the Pascal/Delphi language.

	   ·   perl suitable for source code in the Perl language.

	   ·   php suitable for source code in the PHP language.

	   ·   python suitable for source code in the Python language.

	   ·   ruby suitable for source code in the Ruby language.

	   ·   tex suitable for source code for LaTeX documents.

       Customizing word diff
	   You can customize the rules that git diff --word-diff uses to split
	   words in a line, by specifying an appropriate regular expression in
	   the "diff.*.wordRegex" configuration variable. For example, in TeX
	   a backslash followed by a sequence of letters forms a command, but
	   several such commands can be run together without intervening
	   whitespace. To separate them, use a regular expression in your
	   $GIT_DIR/config file (or $HOME/.gitconfig file) like this:

	       [diff "tex"]
		       wordRegex = "\\\\[a-zA-Z]+|[{}]|\\\\.|[^\\{}[:space:]]+"

	   A built-in pattern is provided for all languages listed in the
	   previous section.

       Performing text diffs of binary files
	   Sometimes it is desirable to see the diff of a text-converted
	   version of some binary files. For example, a word processor
	   document can be converted to an ASCII text representation, and the
	   diff of the text shown. Even though this conversion loses some
	   information, the resulting diff is useful for human viewing (but
	   cannot be applied directly).

	   The textconv config option is used to define a program for
	   performing such a conversion. The program should take a single
	   argument, the name of a file to convert, and produce the resulting
	   text on stdout.

	   For example, to show the diff of the exif information of a file
	   instead of the binary information (assuming you have the exif tool
	   installed), add the following section to your $GIT_DIR/config file
	   (or $HOME/.gitconfig file):

	       [diff "jpg"]
		       textconv = exif

	       Note
	       The text conversion is generally a one-way conversion; in this
	       example, we lose the actual image contents and focus just on
	       the text data. This means that diffs generated by textconv are
	       not suitable for applying. For this reason, only git diff and
	       the git log family of commands (i.e., log, whatchanged, show)
	       will perform text conversion. git format-patch will never
	       generate this output. If you want to send somebody a
	       text-converted diff of a binary file (e.g., because it quickly
	       conveys the changes you have made), you should generate it
	       separately and send it as a comment in addition to the usual
	       binary diff that you might send.

	   Because text conversion can be slow, especially when doing a large
	   number of them with git log -p, Git provides a mechanism to cache
	   the output and use it in future diffs. To enable caching, set the
	   "cachetextconv" variable in your diff driver’s config. For example:

	       [diff "jpg"]
		       textconv = exif
		       cachetextconv = true

	   This will cache the result of running "exif" on each blob
	   indefinitely. If you change the textconv config variable for a diff
	   driver, Git will automatically invalidate the cache entries and
	   re-run the textconv filter. If you want to invalidate the cache
	   manually (e.g., because your version of "exif" was updated and now
	   produces better output), you can remove the cache manually with git
	   update-ref -d refs/notes/textconv/jpg (where "jpg" is the name of
	   the diff driver, as in the example above).

       Choosing textconv versus external diff
	   If you want to show differences between binary or
	   specially-formatted blobs in your repository, you can choose to use
	   either an external diff command, or to use textconv to convert them
	   to a diff-able text format. Which method you choose depends on your
	   exact situation.

	   The advantage of using an external diff command is flexibility. You
	   are not bound to find line-oriented changes, nor is it necessary
	   for the output to resemble unified diff. You are free to locate and
	   report changes in the most appropriate way for your data format.

	   A textconv, by comparison, is much more limiting. You provide a
	   transformation of the data into a line-oriented text format, and
	   Git uses its regular diff tools to generate the output. There are
	   several advantages to choosing this method:

	    1. Ease of use. It is often much simpler to write a binary to text
	       transformation than it is to perform your own diff. In many
	       cases, existing programs can be used as textconv filters (e.g.,
	       exif, odt2txt).

	    2. Git diff features. By performing only the transformation step
	       yourself, you can still utilize many of Git’s diff features,
	       including colorization, word-diff, and combined diffs for
	       merges.

	    3. Caching. Textconv caching can speed up repeated diffs, such as
	       those you might trigger by running git log -p.

       Marking files as binary
	   Git usually guesses correctly whether a blob contains text or
	   binary data by examining the beginning of the contents. However,
	   sometimes you may want to override its decision, either because a
	   blob contains binary data later in the file, or because the
	   content, while technically composed of text characters, is opaque
	   to a human reader. For example, many postscript files contain only
	   ascii characters, but produce noisy and meaningless diffs.

	   The simplest way to mark a file as binary is to unset the diff
	   attribute in the .gitattributes file:

	       *.ps -diff

	   This will cause Git to generate Binary files differ (or a binary
	   patch, if binary patches are enabled) instead of a regular diff.

	   However, one may also want to specify other diff driver attributes.
	   For example, you might want to use textconv to convert postscript
	   files to an ascii representation for human viewing, but otherwise
	   treat them as binary files. You cannot specify both -diff and
	   diff=ps attributes. The solution is to use the diff.*.binary config
	   option:

	       [diff "ps"]
		 textconv = ps2ascii
		 binary = true

   Performing a three-way merge
       merge
	   The attribute merge affects how three versions of a file are merged
	   when a file-level merge is necessary during git merge, and other
	   commands such as git revert and git cherry-pick.

	   Set
	       Built-in 3-way merge driver is used to merge the contents in a
	       way similar to merge command of RCS suite. This is suitable for
	       ordinary text files.

	   Unset
	       Take the version from the current branch as the tentative merge
	       result, and declare that the merge has conflicts. This is
	       suitable for binary files that do not have a well-defined merge
	       semantics.

	   Unspecified
	       By default, this uses the same built-in 3-way merge driver as
	       is the case when the merge attribute is set. However, the
	       merge.default configuration variable can name different merge
	       driver to be used with paths for which the merge attribute is
	       unspecified.

	   String
	       3-way merge is performed using the specified custom merge
	       driver. The built-in 3-way merge driver can be explicitly
	       specified by asking for "text" driver; the built-in "take the
	       current branch" driver can be requested with "binary".

       Built-in merge drivers
	   There are a few built-in low-level merge drivers defined that can
	   be asked for via the merge attribute.

	   text
	       Usual 3-way file level merge for text files. Conflicted regions
	       are marked with conflict markers <<<<<<<, ======= and >>>>>>>.
	       The version from your branch appears before the ======= marker,
	       and the version from the merged branch appears after the
	       ======= marker.

	   binary
	       Keep the version from your branch in the work tree, but leave
	       the path in the conflicted state for the user to sort out.

	   union
	       Run 3-way file level merge for text files, but take lines from
	       both versions, instead of leaving conflict markers. This tends
	       to leave the added lines in the resulting file in random order
	       and the user should verify the result. Do not use this if you
	       do not understand the implications.

       Defining a custom merge driver
	   The definition of a merge driver is done in the .git/config file,
	   not in the gitattributes file, so strictly speaking this manual
	   page is a wrong place to talk about it. However...

	   To define a custom merge driver filfre, add a section to your
	   $GIT_DIR/config file (or $HOME/.gitconfig file) like this:

	       [merge "filfre"]
		       name = feel-free merge driver
		       driver = filfre %O %A %B
		       recursive = binary

	   The merge.*.name variable gives the driver a human-readable name.

	   The ‘merge.*.driver` variable’s value is used to construct a
	   command to run to merge ancestor’s version (%O), current version
	   (%A) and the other branches’ version (%B). These three tokens are
	   replaced with the names of temporary files that hold the contents
	   of these versions when the command line is built. Additionally, %L
	   will be replaced with the conflict marker size (see below).

	   The merge driver is expected to leave the result of the merge in
	   the file named with %A by overwriting it, and exit with zero status
	   if it managed to merge them cleanly, or non-zero if there were
	   conflicts.

	   The merge.*.recursive variable specifies what other merge driver to
	   use when the merge driver is called for an internal merge between
	   common ancestors, when there are more than one. When left
	   unspecified, the driver itself is used for both internal merge and
	   the final merge.

       conflict-marker-size
	   This attribute controls the length of conflict markers left in the
	   work tree file during a conflicted merge. Only setting to the value
	   to a positive integer has any meaningful effect.

	   For example, this line in .gitattributes can be used to tell the
	   merge machinery to leave much longer (instead of the usual
	   7-character-long) conflict markers when merging the file
	   Documentation/git-merge.txt results in a conflict.

	       Documentation/git-merge.txt     conflict-marker-size=32

   Checking whitespace errors
       whitespace
	   The core.whitespace configuration variable allows you to define
	   what diff and apply should consider whitespace errors for all paths
	   in the project (See git-config(1)). This attribute gives you finer
	   control per path.

	   Set
	       Notice all types of potential whitespace errors known to Git.
	       The tab width is taken from the value of the core.whitespace
	       configuration variable.

	   Unset
	       Do not notice anything as error.

	   Unspecified
	       Use the value of the core.whitespace configuration variable to
	       decide what to notice as error.

	   String
	       Specify a comma separate list of common whitespace problems to
	       notice in the same format as the core.whitespace configuration
	       variable.

   Creating an archive
       export-ignore
	   Files and directories with the attribute export-ignore won’t be
	   added to archive files.

       export-subst
	   If the attribute export-subst is set for a file then Git will
	   expand several placeholders when adding this file to an archive.
	   The expansion depends on the availability of a commit ID, i.e., if
	   git-archive(1) has been given a tree instead of a commit or a tag
	   then no replacement will be done. The placeholders are the same as
	   those for the option --pretty=format: of git-log(1), except that
	   they need to be wrapped like this: $Format:PLACEHOLDERS$ in the
	   file. E.g. the string $Format:%H$ will be replaced by the commit
	   hash.

   Packing objects
       delta
	   Delta compression will not be attempted for blobs for paths with
	   the attribute delta set to false.

   Viewing files in GUI tools
       encoding
	   The value of this attribute specifies the character encoding that
	   should be used by GUI tools (e.g. gitk(1) and git-gui(1)) to
	   display the contents of the relevant file. Note that due to
	   performance considerations gitk(1) does not use this attribute
	   unless you manually enable per-file encodings in its options.

	   If this attribute is not set or has an invalid value, the value of
	   the gui.encoding configuration variable is used instead (See git-
	   config(1)).

USING MACRO ATTRIBUTES
       You do not want any end-of-line conversions applied to, nor textual
       diffs produced for, any binary file you track. You would need to
       specify e.g.

	   *.jpg -text -diff

       but that may become cumbersome, when you have many attributes. Using
       macro attributes, you can define an attribute that, when set, also sets
       or unsets a number of other attributes at the same time. The system
       knows a built-in macro attribute, binary:

	   *.jpg binary

       Setting the "binary" attribute also unsets the "text" and "diff"
       attributes as above. Note that macro attributes can only be "Set",
       though setting one might have the effect of setting or unsetting other
       attributes or even returning other attributes to the "Unspecified"
       state.

DEFINING MACRO ATTRIBUTES
       Custom macro attributes can be defined only in the .gitattributes file
       at the toplevel (i.e. not in any subdirectory). The built-in macro
       attribute "binary" is equivalent to:

	   [attr]binary -diff -merge -text


EXAMPLE
       If you have these three gitattributes file:

	   (in $GIT_DIR/info/attributes)

	   a*	   foo !bar -baz

	   (in .gitattributes)
	   abc	   foo bar baz

	   (in t/.gitattributes)
	   ab*	   merge=filfre
	   abc	   -foo -bar
	   *.c	   frotz

       the attributes given to path t/abc are computed as follows:

	1. By examining t/.gitattributes (which is in the same directory as
	   the path in question), Git finds that the first line matches.
	   merge attribute is set. It also finds that the second line matches,
	   and attributes foo and bar are unset.

	2. Then it examines .gitattributes (which is in the parent directory),
	   and finds that the first line matches, but t/.gitattributes file
	   already decided how merge, foo and bar attributes should be given
	   to this path, so it leaves foo and bar unset. Attribute baz is set.

	3. Finally it examines $GIT_DIR/info/attributes. This file is used to
	   override the in-tree settings. The first line is a match, and foo
	   is set, bar is reverted to unspecified state, and baz is unset.

       As the result, the attributes assignment to t/abc becomes:

	   foo	   set to true
	   bar	   unspecified
	   baz	   set to false
	   merge   set to string value "filfre"
	   frotz   unspecified

SEE ALSO
       git-check-attr(1).

GIT
       Part of the git(1) suite

Git 1.8.4			  09/08/2013		      GITATTRIBUTES(5)
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