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       gitrepository-layout - Git Repository Layout




       A Git repository comes in two different flavours:

       •   a .git directory at the root of the working tree;

       •   a <project>.git directory that is a bare repository (i.e. without its own working
           tree), that is typically used for exchanging histories with others by pushing into it
           and fetching from it.

       Note: Also you can have a plain text file .git at the root of your working tree,
       containing gitdir: <path> to point at the real directory that has the repository. This
       mechanism is often used for a working tree of a submodule checkout, to allow you in the
       containing superproject to git checkout a branch that does not have the submodule. The
       checkout has to remove the entire submodule working tree, without losing the submodule

       These things may exist in a 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 a few ways to violate it.

            1. You could have an incomplete but locally usable repository by creating a shallow
               clone. See git-clone(1).

            2. You could be using the objects/info/alternates or
               $GIT_ALTERNATE_OBJECT_DIRECTORIES mechanisms 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 object stores it borrows from.

           A newly created object is stored in its own file. The objects are splayed over 256
           subdirectories using the first two characters of the sha1 object name to keep the
           number of directory entries in objects itself to a manageable number. 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

           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 preserve objects reachable from refs found in this directory and its

           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 SHA-1 of the object that replaces <obj-sha1>. This is similar to
           info/grafts and is internally used and maintained by git-replace(1). Such refs can be
           exchanged between repositories while grafts are not.

           records the same information as refs/heads/, refs/tags/, and friends record in a more
           efficient way. See 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

           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.  See git-checkout(1)
           for details.

           A slightly deprecated way to store shorthands to be used to specify a URL to git
           fetch, git pull and git push. A file can be stored as branches/<name> and then name
           can be given to these commands in place of repository argument. See the REMOTES
           section in git-fetch(1) for details. This mechanism is legacy and not likely to be
           found in modern repositories.

           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, the .sample suffix has to be removed from the filename by renaming. Read
           githooks(5) for more details about each hook.

           The current index file for the repository. It is usually not found in a bare

           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: gitignore(5).

           This file stores sparse checkout patterns. See also: git-read-tree(1).

           Stores shorthands for URL and default refnames for use when interacting with remote
           repositories via git fetch, git pull and git push commands. See the REMOTES section in
           git-fetch(1) for details. This mechanism is legacy and not likely to be found in
           modern repositories.

           Records of changes made to refs are stored in this directory. See git-update-ref(1)
           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 git-clone(1) and git-fetch(1).

           Contains the git-repositories of the submodules.


       git-init(1), git-clone(1), git-fetch(1), git-pack-refs(1), git-gc(1), git-checkout(1),
       gitglossary(7), The Git User’s Manual[1]


       Part of the git(1) suite.


        1. The Git User’s Manual