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Diffstat (limited to 'Documentation/gitattributes.txt')
| -rw-r--r-- | Documentation/gitattributes.txt | 147 |
1 files changed, 93 insertions, 54 deletions
diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt index a85b187e04..e3b1de8033 100644 --- a/Documentation/gitattributes.txt +++ b/Documentation/gitattributes.txt @@ -56,8 +56,9 @@ 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 linkgit:gitignore[5]. +Unlike `.gitignore`, negative patterns are forbidden. -When deciding what attributes are assigned to a path, git +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 @@ -66,6 +67,11 @@ 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 @@ -74,7 +80,9 @@ 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 linkgit:git-config[1]). +`core.attributesFile` configuration option (see linkgit: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. @@ -86,7 +94,7 @@ the name of the attribute prefixed with an exclamation point `!`. EFFECTS ------- -Certain operations by git can be influenced by assigning +Certain operations by Git can be influenced by assigning particular attributes to a path. Currently, the following operations are attributes-aware. @@ -96,7 +104,7 @@ 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 +Git stores the contents you prepare in the working tree in the repository upon 'git add' and 'git commit'. `text` @@ -116,22 +124,22 @@ Set:: Unset:: - Unsetting the `text` attribute on a path tells git not to + 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 + 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 + 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 +Any other value causes Git to act as if `text` has been left unspecified. `eol` @@ -143,13 +151,13 @@ content checks, effectively setting the `text` attribute. Set to string value "crlf":: - This setting forces git to normalize line endings for this + 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 + This setting forces Git to normalize line endings to LF on checkin and prevents conversion to CRLF when the file is checked out. @@ -168,11 +176,11 @@ crlf=input eol=lf End-of-line conversion ^^^^^^^^^^^^^^^^^^^^^^ -While git normally leaves file contents alone, it can be configured to +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 +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. @@ -186,7 +194,7 @@ regardless of their content. Other source code management systems normalize all text files in their repositories, and there are two ways to enable similar automatic -normalization in git. +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 @@ -211,9 +219,9 @@ attribute to "auto" for _all_ files. * text=auto ------------------------ -This ensures that all files that git considers to be text will have +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 +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. @@ -226,7 +234,7 @@ directory: ------------------------------------------------- $ echo "* text=auto" >>.gitattributes -$ rm .git/index # Remove the index to force git to +$ 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 @@ -241,17 +249,17 @@ unset their `text` attribute before running 'git add -u'. manual.pdf -text ------------------------ -Conversely, text files that git does not detect can have normalization +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 +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 +`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... @@ -272,7 +280,7 @@ few exceptions. Even though... `ident` ^^^^^^^ -When the attribute `ident` is set for a path, git replaces +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 @@ -294,16 +302,27 @@ output is used to update the worktree file. Similarly, the `clean` command is used to convert the contents of worktree file upon checkin. -A missing filter driver definition in the config is not an error -but makes the filter a no-op passthru. +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. -The content filtering is done to massage the content into a -shape that is more convenient for the platform, filesystem, and -the user to use. 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. +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. @@ -335,6 +354,16 @@ 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: @@ -368,7 +397,7 @@ 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 +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 @@ -388,11 +417,11 @@ 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 +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 +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:: @@ -411,8 +440,8 @@ 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`. + text and is smaller than core.bigFileThreshold, it is treated + as text. Otherwise it would generate `Binary files differ`. String:: @@ -420,7 +449,7 @@ String:: 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. + Git config file. Defining an external diff driver @@ -438,7 +467,7 @@ To define an external diff driver `jcdiff`, add a section to your command = j-c-diff ---------------------------------------------------------------- -When git needs to show you a diff for the path with `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. @@ -488,6 +517,8 @@ 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. @@ -496,6 +527,8 @@ patterns are available: - `fortran` suitable for source code in the Fortran language. +- `fountain` suitable for Fountain documents. + - `html` suitable for HTML/XHTML documents. - `java` suitable for source code in the Java language. @@ -575,7 +608,7 @@ 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 +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: @@ -588,7 +621,7 @@ config. For example: 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 +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 @@ -609,7 +642,7 @@ 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 +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: @@ -619,7 +652,7 @@ advantages to choosing this method: odt2txt). 2. Git diff features. By performing only the transformation step - yourself, you can still utilize many of git's diff features, + 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 @@ -634,7 +667,7 @@ 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 +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 @@ -644,12 +677,12 @@ attribute in the `.gitattributes` file: *.ps -diff ------------------------ -This will cause git to generate `Binary files differ` (or a binary +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 +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: @@ -743,7 +776,7 @@ To define a custom merge driver `filfre`, add a section to your ---------------------------------------------------------------- [merge "filfre"] name = feel-free merge driver - driver = filfre %O %A %B + driver = filfre %O %A %B %L %P recursive = binary ---------------------------------------------------------------- @@ -769,6 +802,9 @@ 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. +The merge driver can learn the pathname in which the merged result +will be stored via placeholder `%P`. + `conflict-marker-size` ^^^^^^^^^^^^^^^^^^^^^^ @@ -800,7 +836,7 @@ control per path. Set:: - Notice all types of potential whitespace errors known to git. + Notice all types of potential whitespace errors known to Git. The tab width is taken from the value of the `core.whitespace` configuration variable. @@ -832,7 +868,7 @@ archive files. `export-subst` ^^^^^^^^^^^^^^ -If the attribute `export-subst` is set for a file then git will expand +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 linkgit:git-archive[1] has been given a tree instead of a commit or a @@ -899,12 +935,15 @@ 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: +Custom macro attributes can be defined only in top-level gitattributes +files (`$GIT_DIR/info/attributes`, the `.gitattributes` file at the +top level of the working tree, or the global or system-wide +gitattributes files), not in `.gitattributes` files in working tree +subdirectories. The built-in macro attribute "binary" is equivalent +to: ------------ -[attr]binary -diff -text +[attr]binary -diff -merge -text ------------ @@ -930,7 +969,7 @@ abc -foo -bar 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 + 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. |