path: root/Documentation/gitrepository-layout.txt
diff options
Diffstat (limited to 'Documentation/gitrepository-layout.txt')
1 files changed, 208 insertions, 0 deletions
diff --git a/Documentation/gitrepository-layout.txt b/Documentation/gitrepository-layout.txt
new file mode 100644
index 0000000..9949093
--- /dev/null
+++ b/Documentation/gitrepository-layout.txt
@@ -0,0 +1,208 @@
+gitrepository-layout - Git Repository Layout
+You may find these things in your git repository (`.git`
+directory for a repository associated with your working tree, or
+`<project>.git` directory for a public 'bare' repository. It is
+also possible to have a working tree where `.git` is a plain
+ascii file containing `gitdir: <path>`, i.e. the path to the
+real git repository).
+ Object store associated with this repository. Usually
+ an object store is self sufficient (i.e. all the objects
+ that are referred to by an object found in it are also
+ found in it), but there are couple of ways to violate
+ it.
+. You could populate the repository by running a commit walker
+without `-a` option. Depending on which options are given, you
+could have only commit objects without associated blobs and
+trees this way, for example. A repository with this kind of
+incomplete object store is not suitable to be published to the
+outside world but sometimes useful for private repository.
+. You also could have an incomplete but locally usable repository
+by cloning shallowly. See linkgit:git-clone[1].
+. You can be using `objects/info/alternates` mechanism, or
+`$GIT_ALTERNATE_OBJECT_DIRECTORIES` mechanism to 'borrow'
+objects from other object stores. A repository with this kind
+of incomplete object store is not suitable to be published for
+use with dumb transports but otherwise is OK as long as
+`objects/info/alternates` points at the right object stores
+it borrows from.
+ Traditionally, each object is stored in its own file.
+ They are split into 256 subdirectories using the first
+ two letters from its object name to keep the number of
+ directory entries `objects` directory itself needs to
+ hold. Objects found here are often called 'unpacked'
+ (or 'loose') objects.
+ Packs (files that store many object in compressed form,
+ along with index files to allow them to be randomly
+ accessed) are found in this directory.
+ Additional information about the object store is
+ recorded in this directory.
+ This file is to help dumb transports discover what packs
+ are available in this object store. Whenever a pack is
+ added or removed, `git update-server-info` should be run
+ to keep this file up-to-date if the repository is
+ published for dumb transports. `git repack` does this
+ by default.
+ This file records paths to alternate object stores that
+ this object store borrows objects from, one pathname per
+ line. Note that not only native Git tools use it locally,
+ but the HTTP fetcher also tries to use it remotely; this
+ will usually work if you have relative paths (relative
+ to the object database, not to the repository!) in your
+ alternates file, but it will not work if you use absolute
+ paths unless the absolute path in filesystem and web URL
+ is the same. See also 'objects/info/http-alternates'.
+ This file records URLs to alternate object stores that
+ this object store borrows objects from, to be used when
+ the repository is fetched over HTTP.
+ References are stored in subdirectories of this
+ directory. The `git prune` command knows to keep
+ objects reachable from refs found in this directory and
+ its subdirectories.
+ records tip-of-the-tree commit objects of branch `name`
+ records any object name (not necessarily a commit
+ object, or a tag object that points at a commit object).
+ records tip-of-the-tree commit objects of branches copied
+ from a remote repository.
+ records the same information as refs/heads/, refs/tags/,
+ and friends record in a more efficient way. See
+ linkgit:git-pack-refs[1].
+ A symref (see glossary) to the `refs/heads/` namespace
+ describing the currently active branch. It does not mean
+ much if the repository is not associated with any working tree
+ (i.e. a 'bare' repository), but a valid git repository
+ *must* have the HEAD file; some porcelains may use it to
+ guess the designated "default" branch of the repository
+ (usually 'master'). It is legal if the named branch
+ 'name' does not (yet) exist. In some legacy setups, it is
+ a symbolic link instead of a symref that points at the current
+ branch.
+HEAD can also record a specific commit directly, instead of
+being a symref to point at the current branch. Such a state
+is often called 'detached HEAD', and almost all commands work
+identically as normal. See linkgit:git-checkout[1] for
+ A slightly deprecated way to store shorthands to be used
+ to specify URL to `git fetch`, `git pull` and `git push`
+ commands is to store a file in `branches/<name>` and
+ give 'name' to these commands in place of 'repository'
+ argument.
+ Hooks are customization scripts used by various git
+ commands. A handful of sample hooks are installed when
+ `git init` is run, but all of them are disabled by
+ default. To enable, they need to be made executable.
+ Read linkgit:githooks[5][hooks] for more details about
+ each hook.
+ The current index file for the repository. It is
+ usually not found in a bare repository.
+ Additional information about the repository is recorded
+ in this directory.
+ This file helps dumb transports discover what refs are
+ available in this repository. If the repository is
+ published for dumb transports, this file should be
+ regenerated by `git update-server-info` every time a tag
+ or branch is created or modified. This is normally done
+ from the `hooks/update` hook, which is run by the
+ `git-receive-pack` command when you `git push` into the
+ repository.
+ This file records fake commit ancestry information, to
+ pretend the set of parents a commit has is different
+ from how the commit was actually created. One record
+ per line describes a commit and its fake parents by
+ listing their 40-byte hexadecimal object names separated
+ by a space and terminated by a newline.
+ This file, by convention among Porcelains, stores the
+ exclude pattern list. `.gitignore` is the per-directory
+ ignore file. `git status`, `git add`, `git rm` and `git
+ clean` look at it but the core git commands do not look
+ at it. See also: linkgit:gitignore[5].
+ Stores shorthands to be used to give URL and default
+ refnames to interact with remote repository to `git
+ fetch`, `git pull` and `git push` commands.
+ Records of changes made to refs are stored in this
+ directory. See the documentation on git-update-ref
+ for more information.
+ Records all changes made to the branch tip named `name`.
+ Records all changes made to the tag named `name`.
+ This is similar to `info/grafts` but is internally used
+ and maintained by shallow clone mechanism. See `--depth`
+ option to linkgit:git-clone[1] and linkgit:git-fetch[1].
+link:user-manual.html[The Git User's Manual]
+Part of the linkgit:git[7] suite.