Documentation / git.txton commit Merge branch 'rs/realloc-array' (1c2ea2c)
   1git(1)
   2======
   3
   4NAME
   5----
   6git - the stupid content tracker
   7
   8
   9SYNOPSIS
  10--------
  11[verse]
  12'git' [--version] [--help] [-C <path>] [-c <name>=<value>]
  13    [--exec-path[=<path>]] [--html-path] [--man-path] [--info-path]
  14    [-p|--paginate|--no-pager] [--no-replace-objects] [--bare]
  15    [--git-dir=<path>] [--work-tree=<path>] [--namespace=<name>]
  16    <command> [<args>]
  17
  18DESCRIPTION
  19-----------
  20Git is a fast, scalable, distributed revision control system with an
  21unusually rich command set that provides both high-level operations
  22and full access to internals.
  23
  24See linkgit:gittutorial[7] to get started, then see
  25link:everyday.html[Everyday Git] for a useful minimum set of
  26commands.  The link:user-manual.html[Git User's Manual] has a more
  27in-depth introduction.
  28
  29After you mastered the basic concepts, you can come back to this
  30page to learn what commands Git offers.  You can learn more about
  31individual Git commands with "git help command".  linkgit:gitcli[7]
  32manual page gives you an overview of the command-line command syntax.
  33
  34Formatted and hyperlinked version of the latest Git documentation
  35can be viewed at `http://git-htmldocs.googlecode.com/git/git.html`.
  36
  37ifdef::stalenotes[]
  38[NOTE]
  39============
  40
  41You are reading the documentation for the latest (possibly
  42unreleased) version of Git, that is available from the 'master'
  43branch of the `git.git` repository.
  44Documentation for older releases are available here:
  45
  46* link:v2.1.1/git.html[documentation for release 2.1.1]
  47
  48* release notes for
  49  link:RelNotes/2.1.1.txt[2.1.1],
  50  link:RelNotes/2.1.0.txt[2.1].
  51
  52* link:v2.0.4/git.html[documentation for release 2.0.4]
  53
  54* release notes for
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  56  link:RelNotes/2.0.3.txt[2.0.3],
  57  link:RelNotes/2.0.2.txt[2.0.2],
  58  link:RelNotes/2.0.1.txt[2.0.1],
  59  link:RelNotes/2.0.0.txt[2.0.0].
  60
  61* link:v1.9.4/git.html[documentation for release 1.9.4]
  62
  63* release notes for
  64  link:RelNotes/1.9.4.txt[1.9.4],
  65  link:RelNotes/1.9.3.txt[1.9.3],
  66  link:RelNotes/1.9.2.txt[1.9.2],
  67  link:RelNotes/1.9.1.txt[1.9.1],
  68  link:RelNotes/1.9.0.txt[1.9.0].
  69
  70* link:v1.8.5.5/git.html[documentation for release 1.8.5.5]
  71
  72* release notes for
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  77  link:RelNotes/1.8.5.1.txt[1.8.5.1],
  78  link:RelNotes/1.8.5.txt[1.8.5].
  79
  80* link:v1.8.4.5/git.html[documentation for release 1.8.4.5]
  81
  82* release notes for
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 355* link:v1.5.4.7/git.html[documentation for release 1.5.4.7]
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 413  link:v1.3.3/git.html[1.3.3],
 414  link:v1.2.6/git.html[1.2.6],
 415  link:v1.0.13/git.html[1.0.13].
 416
 417============
 418
 419endif::stalenotes[]
 420
 421OPTIONS
 422-------
 423--version::
 424        Prints the Git suite version that the 'git' program came from.
 425
 426--help::
 427        Prints the synopsis and a list of the most commonly used
 428        commands. If the option '--all' or '-a' is given then all
 429        available commands are printed. If a Git command is named this
 430        option will bring up the manual page for that command.
 431+
 432Other options are available to control how the manual page is
 433displayed. See linkgit:git-help[1] for more information,
 434because `git --help ...` is converted internally into `git
 435help ...`.
 436
 437-C <path>::
 438        Run as if git was started in '<path>' instead of the current working
 439        directory.  When multiple `-C` options are given, each subsequent
 440        non-absolute `-C <path>` is interpreted relative to the preceding `-C
 441        <path>`.
 442+
 443This option affects options that expect path name like `--git-dir` and
 444`--work-tree` in that their interpretations of the path names would be
 445made relative to the working directory caused by the `-C` option. For
 446example the following invocations are equivalent:
 447
 448    git --git-dir=a.git --work-tree=b -C c status
 449    git --git-dir=c/a.git --work-tree=c/b status
 450
 451-c <name>=<value>::
 452        Pass a configuration parameter to the command. The value
 453        given will override values from configuration files.
 454        The <name> is expected in the same format as listed by
 455        'git config' (subkeys separated by dots).
 456+
 457Note that omitting the `=` in `git -c foo.bar ...` is allowed and sets
 458`foo.bar` to the boolean true value (just like `[foo]bar` would in a
 459config file). Including the equals but with an empty value (like `git -c
 460foo.bar= ...`) sets `foo.bar` to the empty string.
 461
 462--exec-path[=<path>]::
 463        Path to wherever your core Git programs are installed.
 464        This can also be controlled by setting the GIT_EXEC_PATH
 465        environment variable. If no path is given, 'git' will print
 466        the current setting and then exit.
 467
 468--html-path::
 469        Print the path, without trailing slash, where Git's HTML
 470        documentation is installed and exit.
 471
 472--man-path::
 473        Print the manpath (see `man(1)`) for the man pages for
 474        this version of Git and exit.
 475
 476--info-path::
 477        Print the path where the Info files documenting this
 478        version of Git are installed and exit.
 479
 480-p::
 481--paginate::
 482        Pipe all output into 'less' (or if set, $PAGER) if standard
 483        output is a terminal.  This overrides the `pager.<cmd>`
 484        configuration options (see the "Configuration Mechanism" section
 485        below).
 486
 487--no-pager::
 488        Do not pipe Git output into a pager.
 489
 490--git-dir=<path>::
 491        Set the path to the repository. This can also be controlled by
 492        setting the GIT_DIR environment variable. It can be an absolute
 493        path or relative path to current working directory.
 494
 495--work-tree=<path>::
 496        Set the path to the working tree. It can be an absolute path
 497        or a path relative to the current working directory.
 498        This can also be controlled by setting the GIT_WORK_TREE
 499        environment variable and the core.worktree configuration
 500        variable (see core.worktree in linkgit:git-config[1] for a
 501        more detailed discussion).
 502
 503--namespace=<path>::
 504        Set the Git namespace.  See linkgit:gitnamespaces[7] for more
 505        details.  Equivalent to setting the `GIT_NAMESPACE` environment
 506        variable.
 507
 508--bare::
 509        Treat the repository as a bare repository.  If GIT_DIR
 510        environment is not set, it is set to the current working
 511        directory.
 512
 513--no-replace-objects::
 514        Do not use replacement refs to replace Git objects. See
 515        linkgit:git-replace[1] for more information.
 516
 517--literal-pathspecs::
 518        Treat pathspecs literally (i.e. no globbing, no pathspec magic).
 519        This is equivalent to setting the `GIT_LITERAL_PATHSPECS` environment
 520        variable to `1`.
 521
 522--glob-pathspecs::
 523        Add "glob" magic to all pathspec. This is equivalent to setting
 524        the `GIT_GLOB_PATHSPECS` environment variable to `1`. Disabling
 525        globbing on individual pathspecs can be done using pathspec
 526        magic ":(literal)"
 527
 528--noglob-pathspecs::
 529        Add "literal" magic to all pathspec. This is equivalent to setting
 530        the `GIT_NOGLOB_PATHSPECS` environment variable to `1`. Enabling
 531        globbing on individual pathspecs can be done using pathspec
 532        magic ":(glob)"
 533
 534--icase-pathspecs::
 535        Add "icase" magic to all pathspec. This is equivalent to setting
 536        the `GIT_ICASE_PATHSPECS` environment variable to `1`.
 537
 538GIT COMMANDS
 539------------
 540
 541We divide Git into high level ("porcelain") commands and low level
 542("plumbing") commands.
 543
 544High-level commands (porcelain)
 545-------------------------------
 546
 547We separate the porcelain commands into the main commands and some
 548ancillary user utilities.
 549
 550Main porcelain commands
 551~~~~~~~~~~~~~~~~~~~~~~~
 552
 553include::cmds-mainporcelain.txt[]
 554
 555Ancillary Commands
 556~~~~~~~~~~~~~~~~~~
 557Manipulators:
 558
 559include::cmds-ancillarymanipulators.txt[]
 560
 561Interrogators:
 562
 563include::cmds-ancillaryinterrogators.txt[]
 564
 565
 566Interacting with Others
 567~~~~~~~~~~~~~~~~~~~~~~~
 568
 569These commands are to interact with foreign SCM and with other
 570people via patch over e-mail.
 571
 572include::cmds-foreignscminterface.txt[]
 573
 574
 575Low-level commands (plumbing)
 576-----------------------------
 577
 578Although Git includes its
 579own porcelain layer, its low-level commands are sufficient to support
 580development of alternative porcelains.  Developers of such porcelains
 581might start by reading about linkgit:git-update-index[1] and
 582linkgit:git-read-tree[1].
 583
 584The interface (input, output, set of options and the semantics)
 585to these low-level commands are meant to be a lot more stable
 586than Porcelain level commands, because these commands are
 587primarily for scripted use.  The interface to Porcelain commands
 588on the other hand are subject to change in order to improve the
 589end user experience.
 590
 591The following description divides
 592the low-level commands into commands that manipulate objects (in
 593the repository, index, and working tree), commands that interrogate and
 594compare objects, and commands that move objects and references between
 595repositories.
 596
 597
 598Manipulation commands
 599~~~~~~~~~~~~~~~~~~~~~
 600
 601include::cmds-plumbingmanipulators.txt[]
 602
 603
 604Interrogation commands
 605~~~~~~~~~~~~~~~~~~~~~~
 606
 607include::cmds-plumbinginterrogators.txt[]
 608
 609In general, the interrogate commands do not touch the files in
 610the working tree.
 611
 612
 613Synching repositories
 614~~~~~~~~~~~~~~~~~~~~~
 615
 616include::cmds-synchingrepositories.txt[]
 617
 618The following are helper commands used by the above; end users
 619typically do not use them directly.
 620
 621include::cmds-synchelpers.txt[]
 622
 623
 624Internal helper commands
 625~~~~~~~~~~~~~~~~~~~~~~~~
 626
 627These are internal helper commands used by other commands; end
 628users typically do not use them directly.
 629
 630include::cmds-purehelpers.txt[]
 631
 632
 633Configuration Mechanism
 634-----------------------
 635
 636Git uses a simple text format to store customizations that are per
 637repository and are per user.  Such a configuration file may look
 638like this:
 639
 640------------
 641#
 642# A '#' or ';' character indicates a comment.
 643#
 644
 645; core variables
 646[core]
 647        ; Don't trust file modes
 648        filemode = false
 649
 650; user identity
 651[user]
 652        name = "Junio C Hamano"
 653        email = "gitster@pobox.com"
 654
 655------------
 656
 657Various commands read from the configuration file and adjust
 658their operation accordingly.  See linkgit:git-config[1] for a
 659list and more details about the configuration mechanism.
 660
 661
 662Identifier Terminology
 663----------------------
 664<object>::
 665        Indicates the object name for any type of object.
 666
 667<blob>::
 668        Indicates a blob object name.
 669
 670<tree>::
 671        Indicates a tree object name.
 672
 673<commit>::
 674        Indicates a commit object name.
 675
 676<tree-ish>::
 677        Indicates a tree, commit or tag object name.  A
 678        command that takes a <tree-ish> argument ultimately wants to
 679        operate on a <tree> object but automatically dereferences
 680        <commit> and <tag> objects that point at a <tree>.
 681
 682<commit-ish>::
 683        Indicates a commit or tag object name.  A
 684        command that takes a <commit-ish> argument ultimately wants to
 685        operate on a <commit> object but automatically dereferences
 686        <tag> objects that point at a <commit>.
 687
 688<type>::
 689        Indicates that an object type is required.
 690        Currently one of: `blob`, `tree`, `commit`, or `tag`.
 691
 692<file>::
 693        Indicates a filename - almost always relative to the
 694        root of the tree structure `GIT_INDEX_FILE` describes.
 695
 696Symbolic Identifiers
 697--------------------
 698Any Git command accepting any <object> can also use the following
 699symbolic notation:
 700
 701HEAD::
 702        indicates the head of the current branch.
 703
 704<tag>::
 705        a valid tag 'name'
 706        (i.e. a `refs/tags/<tag>` reference).
 707
 708<head>::
 709        a valid head 'name'
 710        (i.e. a `refs/heads/<head>` reference).
 711
 712For a more complete list of ways to spell object names, see
 713"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 714
 715
 716File/Directory Structure
 717------------------------
 718
 719Please see the linkgit:gitrepository-layout[5] document.
 720
 721Read linkgit:githooks[5] for more details about each hook.
 722
 723Higher level SCMs may provide and manage additional information in the
 724`$GIT_DIR`.
 725
 726
 727Terminology
 728-----------
 729Please see linkgit:gitglossary[7].
 730
 731
 732Environment Variables
 733---------------------
 734Various Git commands use the following environment variables:
 735
 736The Git Repository
 737~~~~~~~~~~~~~~~~~~
 738These environment variables apply to 'all' core Git commands. Nb: it
 739is worth noting that they may be used/overridden by SCMS sitting above
 740Git so take care if using Cogito etc.
 741
 742'GIT_INDEX_FILE'::
 743        This environment allows the specification of an alternate
 744        index file. If not specified, the default of `$GIT_DIR/index`
 745        is used.
 746
 747'GIT_INDEX_VERSION'::
 748        This environment variable allows the specification of an index
 749        version for new repositories.  It won't affect existing index
 750        files.  By default index file version [23] is used.
 751
 752'GIT_OBJECT_DIRECTORY'::
 753        If the object storage directory is specified via this
 754        environment variable then the sha1 directories are created
 755        underneath - otherwise the default `$GIT_DIR/objects`
 756        directory is used.
 757
 758'GIT_ALTERNATE_OBJECT_DIRECTORIES'::
 759        Due to the immutable nature of Git objects, old objects can be
 760        archived into shared, read-only directories. This variable
 761        specifies a ":" separated (on Windows ";" separated) list
 762        of Git object directories which can be used to search for Git
 763        objects. New objects will not be written to these directories.
 764
 765'GIT_DIR'::
 766        If the 'GIT_DIR' environment variable is set then it
 767        specifies a path to use instead of the default `.git`
 768        for the base of the repository.
 769        The '--git-dir' command-line option also sets this value.
 770
 771'GIT_WORK_TREE'::
 772        Set the path to the root of the working tree.
 773        This can also be controlled by the '--work-tree' command-line
 774        option and the core.worktree configuration variable.
 775
 776'GIT_NAMESPACE'::
 777        Set the Git namespace; see linkgit:gitnamespaces[7] for details.
 778        The '--namespace' command-line option also sets this value.
 779
 780'GIT_CEILING_DIRECTORIES'::
 781        This should be a colon-separated list of absolute paths.  If
 782        set, it is a list of directories that Git should not chdir up
 783        into while looking for a repository directory (useful for
 784        excluding slow-loading network directories).  It will not
 785        exclude the current working directory or a GIT_DIR set on the
 786        command line or in the environment.  Normally, Git has to read
 787        the entries in this list and resolve any symlink that
 788        might be present in order to compare them with the current
 789        directory.  However, if even this access is slow, you
 790        can add an empty entry to the list to tell Git that the
 791        subsequent entries are not symlinks and needn't be resolved;
 792        e.g.,
 793        'GIT_CEILING_DIRECTORIES=/maybe/symlink::/very/slow/non/symlink'.
 794
 795'GIT_DISCOVERY_ACROSS_FILESYSTEM'::
 796        When run in a directory that does not have ".git" repository
 797        directory, Git tries to find such a directory in the parent
 798        directories to find the top of the working tree, but by default it
 799        does not cross filesystem boundaries.  This environment variable
 800        can be set to true to tell Git not to stop at filesystem
 801        boundaries.  Like 'GIT_CEILING_DIRECTORIES', this will not affect
 802        an explicit repository directory set via 'GIT_DIR' or on the
 803        command line.
 804
 805Git Commits
 806~~~~~~~~~~~
 807'GIT_AUTHOR_NAME'::
 808'GIT_AUTHOR_EMAIL'::
 809'GIT_AUTHOR_DATE'::
 810'GIT_COMMITTER_NAME'::
 811'GIT_COMMITTER_EMAIL'::
 812'GIT_COMMITTER_DATE'::
 813'EMAIL'::
 814        see linkgit:git-commit-tree[1]
 815
 816Git Diffs
 817~~~~~~~~~
 818'GIT_DIFF_OPTS'::
 819        Only valid setting is "--unified=??" or "-u??" to set the
 820        number of context lines shown when a unified diff is created.
 821        This takes precedence over any "-U" or "--unified" option
 822        value passed on the Git diff command line.
 823
 824'GIT_EXTERNAL_DIFF'::
 825        When the environment variable 'GIT_EXTERNAL_DIFF' is set, the
 826        program named by it is called, instead of the diff invocation
 827        described above.  For a path that is added, removed, or modified,
 828        'GIT_EXTERNAL_DIFF' is called with 7 parameters:
 829
 830        path old-file old-hex old-mode new-file new-hex new-mode
 831+
 832where:
 833
 834        <old|new>-file:: are files GIT_EXTERNAL_DIFF can use to read the
 835                         contents of <old|new>,
 836        <old|new>-hex:: are the 40-hexdigit SHA-1 hashes,
 837        <old|new>-mode:: are the octal representation of the file modes.
 838+
 839The file parameters can point at the user's working file
 840(e.g. `new-file` in "git-diff-files"), `/dev/null` (e.g. `old-file`
 841when a new file is added), or a temporary file (e.g. `old-file` in the
 842index).  'GIT_EXTERNAL_DIFF' should not worry about unlinking the
 843temporary file --- it is removed when 'GIT_EXTERNAL_DIFF' exits.
 844+
 845For a path that is unmerged, 'GIT_EXTERNAL_DIFF' is called with 1
 846parameter, <path>.
 847+
 848For each path 'GIT_EXTERNAL_DIFF' is called, two environment variables,
 849'GIT_DIFF_PATH_COUNTER' and 'GIT_DIFF_PATH_TOTAL' are set.
 850
 851'GIT_DIFF_PATH_COUNTER'::
 852        A 1-based counter incremented by one for every path.
 853
 854'GIT_DIFF_PATH_TOTAL'::
 855        The total number of paths.
 856
 857other
 858~~~~~
 859'GIT_MERGE_VERBOSITY'::
 860        A number controlling the amount of output shown by
 861        the recursive merge strategy.  Overrides merge.verbosity.
 862        See linkgit:git-merge[1]
 863
 864'GIT_PAGER'::
 865        This environment variable overrides `$PAGER`. If it is set
 866        to an empty string or to the value "cat", Git will not launch
 867        a pager.  See also the `core.pager` option in
 868        linkgit:git-config[1].
 869
 870'GIT_EDITOR'::
 871        This environment variable overrides `$EDITOR` and `$VISUAL`.
 872        It is used by several Git commands when, on interactive mode,
 873        an editor is to be launched. See also linkgit:git-var[1]
 874        and the `core.editor` option in linkgit:git-config[1].
 875
 876'GIT_SSH'::
 877        If this environment variable is set then 'git fetch'
 878        and 'git push' will use this command instead
 879        of 'ssh' when they need to connect to a remote system.
 880        The '$GIT_SSH' command will be given exactly two or
 881        four arguments: the 'username@host' (or just 'host')
 882        from the URL and the shell command to execute on that
 883        remote system, optionally preceded by '-p' (literally) and
 884        the 'port' from the URL when it specifies something other
 885        than the default SSH port.
 886+
 887To pass options to the program that you want to list in GIT_SSH
 888you will need to wrap the program and options into a shell script,
 889then set GIT_SSH to refer to the shell script.
 890+
 891Usually it is easier to configure any desired options through your
 892personal `.ssh/config` file.  Please consult your ssh documentation
 893for further details.
 894
 895'GIT_ASKPASS'::
 896        If this environment variable is set, then Git commands which need to
 897        acquire passwords or passphrases (e.g. for HTTP or IMAP authentication)
 898        will call this program with a suitable prompt as command-line argument
 899        and read the password from its STDOUT. See also the 'core.askpass'
 900        option in linkgit:git-config[1].
 901
 902'GIT_CONFIG_NOSYSTEM'::
 903        Whether to skip reading settings from the system-wide
 904        `$(prefix)/etc/gitconfig` file.  This environment variable can
 905        be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
 906        predictable environment for a picky script, or you can set it
 907        temporarily to avoid using a buggy `/etc/gitconfig` file while
 908        waiting for someone with sufficient permissions to fix it.
 909
 910'GIT_FLUSH'::
 911        If this environment variable is set to "1", then commands such
 912        as 'git blame' (in incremental mode), 'git rev-list', 'git log',
 913        'git check-attr' and 'git check-ignore' will
 914        force a flush of the output stream after each record have been
 915        flushed. If this
 916        variable is set to "0", the output of these commands will be done
 917        using completely buffered I/O.   If this environment variable is
 918        not set, Git will choose buffered or record-oriented flushing
 919        based on whether stdout appears to be redirected to a file or not.
 920
 921'GIT_TRACE'::
 922        Enables general trace messages, e.g. alias expansion, built-in
 923        command execution and external command execution.
 924+
 925If this variable is set to "1", "2" or "true" (comparison
 926is case insensitive), trace messages will be printed to
 927stderr.
 928+
 929If the variable is set to an integer value greater than 2
 930and lower than 10 (strictly) then Git will interpret this
 931value as an open file descriptor and will try to write the
 932trace messages into this file descriptor.
 933+
 934Alternatively, if the variable is set to an absolute path
 935(starting with a '/' character), Git will interpret this
 936as a file path and will try to write the trace messages
 937into it.
 938+
 939Unsetting the variable, or setting it to empty, "0" or
 940"false" (case insensitive) disables trace messages.
 941
 942'GIT_TRACE_PACK_ACCESS'::
 943        Enables trace messages for all accesses to any packs. For each
 944        access, the pack file name and an offset in the pack is
 945        recorded. This may be helpful for troubleshooting some
 946        pack-related performance problems.
 947        See 'GIT_TRACE' for available trace output options.
 948
 949'GIT_TRACE_PACKET'::
 950        Enables trace messages for all packets coming in or out of a
 951        given program. This can help with debugging object negotiation
 952        or other protocol issues. Tracing is turned off at a packet
 953        starting with "PACK".
 954        See 'GIT_TRACE' for available trace output options.
 955
 956'GIT_TRACE_PERFORMANCE'::
 957        Enables performance related trace messages, e.g. total execution
 958        time of each Git command.
 959        See 'GIT_TRACE' for available trace output options.
 960
 961'GIT_TRACE_SETUP'::
 962        Enables trace messages printing the .git, working tree and current
 963        working directory after Git has completed its setup phase.
 964        See 'GIT_TRACE' for available trace output options.
 965
 966'GIT_TRACE_SHALLOW'::
 967        Enables trace messages that can help debugging fetching /
 968        cloning of shallow repositories.
 969        See 'GIT_TRACE' for available trace output options.
 970
 971GIT_LITERAL_PATHSPECS::
 972        Setting this variable to `1` will cause Git to treat all
 973        pathspecs literally, rather than as glob patterns. For example,
 974        running `GIT_LITERAL_PATHSPECS=1 git log -- '*.c'` will search
 975        for commits that touch the path `*.c`, not any paths that the
 976        glob `*.c` matches. You might want this if you are feeding
 977        literal paths to Git (e.g., paths previously given to you by
 978        `git ls-tree`, `--raw` diff output, etc).
 979
 980GIT_GLOB_PATHSPECS::
 981        Setting this variable to `1` will cause Git to treat all
 982        pathspecs as glob patterns (aka "glob" magic).
 983
 984GIT_NOGLOB_PATHSPECS::
 985        Setting this variable to `1` will cause Git to treat all
 986        pathspecs as literal (aka "literal" magic).
 987
 988GIT_ICASE_PATHSPECS::
 989        Setting this variable to `1` will cause Git to treat all
 990        pathspecs as case-insensitive.
 991
 992'GIT_REFLOG_ACTION'::
 993        When a ref is updated, reflog entries are created to keep
 994        track of the reason why the ref was updated (which is
 995        typically the name of the high-level command that updated
 996        the ref), in addition to the old and new values of the ref.
 997        A scripted Porcelain command can use set_reflog_action
 998        helper function in `git-sh-setup` to set its name to this
 999        variable when it is invoked as the top level command by the
1000        end user, to be recorded in the body of the reflog.
1001
1002
1003Discussion[[Discussion]]
1004------------------------
1005
1006More detail on the following is available from the
1007link:user-manual.html#git-concepts[Git concepts chapter of the
1008user-manual] and linkgit:gitcore-tutorial[7].
1009
1010A Git project normally consists of a working directory with a ".git"
1011subdirectory at the top level.  The .git directory contains, among other
1012things, a compressed object database representing the complete history
1013of the project, an "index" file which links that history to the current
1014contents of the working tree, and named pointers into that history such
1015as tags and branch heads.
1016
1017The object database contains objects of three main types: blobs, which
1018hold file data; trees, which point to blobs and other trees to build up
1019directory hierarchies; and commits, which each reference a single tree
1020and some number of parent commits.
1021
1022The commit, equivalent to what other systems call a "changeset" or
1023"version", represents a step in the project's history, and each parent
1024represents an immediately preceding step.  Commits with more than one
1025parent represent merges of independent lines of development.
1026
1027All objects are named by the SHA-1 hash of their contents, normally
1028written as a string of 40 hex digits.  Such names are globally unique.
1029The entire history leading up to a commit can be vouched for by signing
1030just that commit.  A fourth object type, the tag, is provided for this
1031purpose.
1032
1033When first created, objects are stored in individual files, but for
1034efficiency may later be compressed together into "pack files".
1035
1036Named pointers called refs mark interesting points in history.  A ref
1037may contain the SHA-1 name of an object or the name of another ref.  Refs
1038with names beginning `ref/head/` contain the SHA-1 name of the most
1039recent commit (or "head") of a branch under development.  SHA-1 names of
1040tags of interest are stored under `ref/tags/`.  A special ref named
1041`HEAD` contains the name of the currently checked-out branch.
1042
1043The index file is initialized with a list of all paths and, for each
1044path, a blob object and a set of attributes.  The blob object represents
1045the contents of the file as of the head of the current branch.  The
1046attributes (last modified time, size, etc.) are taken from the
1047corresponding file in the working tree.  Subsequent changes to the
1048working tree can be found by comparing these attributes.  The index may
1049be updated with new content, and new commits may be created from the
1050content stored in the index.
1051
1052The index is also capable of storing multiple entries (called "stages")
1053for a given pathname.  These stages are used to hold the various
1054unmerged version of a file when a merge is in progress.
1055
1056FURTHER DOCUMENTATION
1057---------------------
1058
1059See the references in the "description" section to get started
1060using Git.  The following is probably more detail than necessary
1061for a first-time user.
1062
1063The link:user-manual.html#git-concepts[Git concepts chapter of the
1064user-manual] and linkgit:gitcore-tutorial[7] both provide
1065introductions to the underlying Git architecture.
1066
1067See linkgit:gitworkflows[7] for an overview of recommended workflows.
1068
1069See also the link:howto-index.html[howto] documents for some useful
1070examples.
1071
1072The internals are documented in the
1073link:technical/api-index.html[Git API documentation].
1074
1075Users migrating from CVS may also want to
1076read linkgit:gitcvs-migration[7].
1077
1078
1079Authors
1080-------
1081Git was started by Linus Torvalds, and is currently maintained by Junio
1082C Hamano. Numerous contributions have come from the Git mailing list
1083<git@vger.kernel.org>.  http://www.openhub.net/p/git/contributors/summary
1084gives you a more complete list of contributors.
1085
1086If you have a clone of git.git itself, the
1087output of linkgit:git-shortlog[1] and linkgit:git-blame[1] can show you
1088the authors for specific parts of the project.
1089
1090Reporting Bugs
1091--------------
1092
1093Report bugs to the Git mailing list <git@vger.kernel.org> where the
1094development and maintenance is primarily done.  You do not have to be
1095subscribed to the list to send a message there.
1096
1097SEE ALSO
1098--------
1099linkgit:gittutorial[7], linkgit:gittutorial-2[7],
1100link:everyday.html[Everyday Git], linkgit:gitcvs-migration[7],
1101linkgit:gitglossary[7], linkgit:gitcore-tutorial[7],
1102linkgit:gitcli[7], link:user-manual.html[The Git User's Manual],
1103linkgit:gitworkflows[7]
1104
1105GIT
1106---
1107Part of the linkgit:git[1] suite