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git(7)
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======
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May 2005
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NAME
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----
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git - the stupid content tracker
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SYNOPSIS
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--------
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'git-<command>' <args>
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DESCRIPTION
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-----------
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This is reference information for the core git commands.
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The Discussion section below contains much useful definition and
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clarification info - read that first. And of the commands, I suggest
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reading link:git-update-cache.html[git-update-cache] and
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link:git-read-tree.html[git-read-tree] first - I wish I had!
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David Greaves <david@dgreaves.com>
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08/05/05
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Updated by Junio C Hamano <junkio@cox.net> on 2005-05-05 to
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reflect recent changes.
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Commands Overview
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-----------------
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The git commands can helpfully be split into those that manipulate
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the repository, the cache and the working fileset, those that
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interrogate and compare them, and those that moves objects and
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references between repositories.
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In addition, git itself comes with a spartan set of porcelain
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commands. They are usable but are not meant to compete with real
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Porcelains.
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There are also some ancilliary programs that can be viewed as useful
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aids for using the core commands but which are unlikely to be used by
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SCMs layered over git.
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Manipulation commands
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~~~~~~~~~~~~~~~~~~~~~
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link:git-checkout-cache.html[git-checkout-cache]::
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Copy files from the cache to the working directory
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link:git-commit-tree.html[git-commit-tree]::
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Creates a new commit object
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link:git-init-db.html[git-init-db]::
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Creates an empty git object database
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link:git-merge-base.html[git-merge-base]::
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Finds as good a common ancestor as possible for a merge
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link:git-mktag.html[git-mktag]::
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Creates a tag object
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link:git-read-tree.html[git-read-tree]::
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Reads tree information into the directory cache
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link:git-update-cache.html[git-update-cache]::
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Modifies the index or directory cache
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link:git-hash-object.html[git-hash-object]::
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Computes the object ID from a file.
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link:git-write-tree.html[git-write-tree]::
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Creates a tree from the current cache
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Interrogation commands
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~~~~~~~~~~~~~~~~~~~~~~
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link:git-cat-file.html[git-cat-file]::
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Provide content or type information for repository objects
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link:git-diff-cache.html[git-diff-cache]::
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Compares content and mode of blobs between the cache and repository
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link:git-diff-files.html[git-diff-files]::
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Compares files in the working tree and the cache
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link:git-diff-tree.html[git-diff-tree]::
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Compares the content and mode of blobs found via two tree objects
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link:git-export.html[git-export]::
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Exports each commit and a diff against each of its parents
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link:git-fsck-cache.html[git-fsck-cache]::
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Verifies the connectivity and validity of the objects in the database
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link:git-ls-files.html[git-ls-files]::
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Information about files in the cache/working directory
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link:git-ls-tree.html[git-ls-tree]::
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Displays a tree object in human readable form
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link:git-merge-cache.html[git-merge-cache]::
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Runs a merge for files needing merging
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link:git-rev-list.html[git-rev-list]::
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Lists commit objects in reverse chronological order
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link:git-rev-tree.html[git-rev-tree]::
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Provides the revision tree for one or more commits
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link:git-tar-tree.html[git-tar-tree]::
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Creates a tar archive of the files in the named tree
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link:git-unpack-file.html[git-unpack-file]::
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Creates a temporary file with a blob's contents
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link:git-var.html[git-var]::
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Displays a git logical variable
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link:git-verify-pack.html[git-verify-pack]::
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Validates packed GIT archive files
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The interrogate commands may create files - and you can force them to
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touch the working file set - but in general they don't
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Synching repositories
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~~~~~~~~~~~~~~~~~~~~~
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link:git-clone-script.html[git-clone-script]::
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Clones a repository into the current repository (user interface)
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link:git-clone-pack.html[git-clone-pack]::
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Clones a repository into the current repository (engine
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for ssh and local transport)
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link:git-http-pull.html[git-http-pull]::
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Downloads a remote GIT repository via HTTP
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link:git-local-pull.html[git-local-pull]::
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Duplicates another GIT repository on a local system
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link:git-ssh-pull.html[git-ssh-pull]::
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Pulls from a remote repository over ssh connection
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link:git-send-pack.html[git-send-pack]::
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Pushes to a remote repository, intelligently.
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link:git-receive-pack.html[git-receive-pack]::
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Invoked by 'git-send-pack' to receive what is pushed to it.
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link:git-clone-pack.html[git-clone-pack]::
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Clones from a remote repository.
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link:git-fetch-pack.html[git-fetch-pack]::
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Updates from a remote repository.
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link:git-peek-remote.html[git-peek-remote]::
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Lists references on a remote repository using upload-pack protocol.
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link:git-upload-pack.html[git-upload-pack]::
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Invoked by 'git-clone-pack' and 'git-fetch-pack' to push
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what are asked for.
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link:git-update-server-info.html[git-update-server-info]::
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Updates auxiliary information on a dumb server to help
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clients discover references and packs on it.
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Porcelainish Commands
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---------------------
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link:git-fetch-script.html[git-fetch-script]::
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Download from a remote repository via various protocols.
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link:git-pull-script.html[git-pull-script]::
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Fetch from and merge with a remote repository.
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link:git-commit-script.html[git-commit-script]::
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Record changes to the repository.
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Ancilliary Commands
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-------------------
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Manipulators:
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link:git-apply-patch-script.html[git-apply-patch-script]::
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Sample script to apply the diffs from git-diff-*
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link:git-convert-cache.html[git-convert-cache]::
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Converts old-style GIT repository
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link:git-merge-one-file-script.html[git-merge-one-file-script]::
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The standard helper program to use with "git-merge-cache"
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link:git-prune-script.html[git-prune-script]::
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Prunes all unreachable objects from the object database
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link:git-resolve-script.html[git-resolve-script]::
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Script used to merge two trees
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link:git-tag-script.html[git-tag-script]::
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An example script to create a tag object signed with GPG
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Interogators:
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link:git-diff-helper.html[git-diff-helper]::
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Generates patch format output for git-diff-*
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link:git-ssh-push.html[git-ssh-push]::
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Helper "server-side" program used by git-ssh-pull
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Identifier Terminology
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----------------------
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<object>::
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Indicates the sha1 identifier for any type of object
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<blob>::
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Indicates a blob object sha1 identifier
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<tree>::
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Indicates a tree object sha1 identifier
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<commit>::
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Indicates a commit object sha1 identifier
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<tree-ish>::
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Indicates a tree, commit or tag object sha1 identifier. A
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command that takes a <tree-ish> argument ultimately wants to
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operate on a <tree> object but automatically dereferences
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<commit> and <tag> objects that point at a <tree>.
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<type>::
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Indicates that an object type is required.
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Currently one of: blob/tree/commit/tag
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<file>::
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Indicates a filename - always relative to the root of
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the tree structure GIT_INDEX_FILE describes.
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Symbolic Identifiers
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--------------------
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Any git comand accepting any <object> can also use the following
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symbolic notation:
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HEAD::
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indicates the head of the repository (ie the contents of
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`$GIT_DIR/HEAD`)
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<tag>::
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a valid tag 'name'+
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(ie the contents of `$GIT_DIR/refs/tags/<tag>`)
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<head>::
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a valid head 'name'+
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(ie the contents of `$GIT_DIR/refs/heads/<head>`)
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<snap>::
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a valid snapshot 'name'+
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(ie the contents of `$GIT_DIR/refs/snap/<snap>`)
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File/Directory Structure
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------------------------
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The git-core manipulates the following areas in the directory:
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.git/ The base (overridden with $GIT_DIR)
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objects/ The object base (overridden with $GIT_OBJECT_DIRECTORY)
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??/ 'First 2 chars of object' directories.
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pack/ Packed archives.
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refs/ Directories containing symbolic names for objects
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(each file contains the hex SHA1 + newline)
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heads/ Commits which are heads of various sorts
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tags/ Tags, by the tag name (or some local renaming of it)
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*/ Any other subdirectory of refs/ can be used to store
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files similar to what are under refs/heads/.
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HEAD Symlink to refs/heads/<current-branch-name>
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Higher level SCMs may provide and manage additional information in the
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GIT_DIR.
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Terminology
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-----------
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Each line contains terms which you may see used interchangeably
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object database, .git directory
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directory cache, index
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id, sha1, sha1-id, sha1 hash
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type, tag
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Environment Variables
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---------------------
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Various git commands use the following environment variables:
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The git Repository
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~~~~~~~~~~~~~~~~~~
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These environment variables apply to 'all' core git commands. Nb: it
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is worth noting that they may be used/overridden by SCMS sitting above
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git so take care if using Cogito etc
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'GIT_INDEX_FILE'::
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This environment allows the specification of an alternate
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cache/index file. If not specified, the default of
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`$GIT_DIR/index` is used.
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'GIT_OBJECT_DIRECTORY'::
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If the object storage directory is specified via this
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environment variable then the sha1 directories are created
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underneath - otherwise the default `$GIT_DIR/objects`
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directory is used.
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'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
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Due to the immutable nature of git objects, old objects can be
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archived into shared, read-only directories. This variable
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specifies a ":" seperated list of git object directories which
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can be used to search for git objects. New objects will not be
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written to these directories.
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'GIT_DIR'::
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If the 'GIT_DIR' environment variable is set then it specifies
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a path to use instead of `./.git` for the base of the
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repository.
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git Commits
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~~~~~~~~~~~
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'GIT_AUTHOR_NAME'::
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'GIT_AUTHOR_EMAIL'::
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'GIT_AUTHOR_DATE'::
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'GIT_COMMITTER_NAME'::
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'GIT_COMMITTER_EMAIL'::
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see link:git-commit-tree.html[git-commit-tree]
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git Diffs
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~~~~~~~~~
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'GIT_DIFF_OPTS'::
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'GIT_EXTERNAL_DIFF'::
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see the "generating patches" section in :
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link:git-diff-cache.html[git-diff-cache];
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link:git-diff-files.html[git-diff-files];
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link:git-diff-tree.html[git-diff-tree]
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Discussion
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----------
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include::../README[]
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org> and the git-list <git@vger.kernel.org>.
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Documentation
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--------------
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Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel.org>.
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GIT
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---
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Part of the link:git.html[git] suite
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