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Diffstat (limited to 'Documentation/glossary-content.txt')
| -rw-r--r-- | Documentation/glossary-content.txt | 340 |
1 files changed, 256 insertions, 84 deletions
diff --git a/Documentation/glossary-content.txt b/Documentation/glossary-content.txt index 96307c870c..8ad29e61a9 100644 --- a/Documentation/glossary-content.txt +++ b/Documentation/glossary-content.txt @@ -1,13 +1,13 @@ [[def_alternate_object_database]]alternate object database:: Via the alternates mechanism, a <<def_repository,repository>> can inherit part of its <<def_object_database,object database>> - from another object database, which is called "alternate". + from another object database, which is called an "alternate". [[def_bare_repository]]bare repository:: A bare repository is normally an appropriately named <<def_directory,directory>> with a `.git` suffix that does not have a locally checked-out copy of any of the files under - revision control. That is, all of the `git` + revision control. That is, all of the Git administrative and control files that would normally be present in the hidden `.git` sub-directory are directly present in the `repository.git` directory instead, @@ -22,7 +22,7 @@ <<def_commit,commit>> on a branch is referred to as the tip of that branch. The tip of the branch is referenced by a branch <<def_head,head>>, which moves forward as additional development - is done on the branch. A single git + is done on the branch. A single Git <<def_repository,repository>> can track an arbitrary number of branches, but your <<def_working_tree,working tree>> is associated with just one of them (the "current" or "checked out" @@ -37,9 +37,9 @@ <<def_commit,commit>> could be one of its <<def_parent,parents>>). [[def_changeset]]changeset:: - BitKeeper/cvsps speak for "<<def_commit,commit>>". Since git does not + BitKeeper/cvsps speak for "<<def_commit,commit>>". Since Git does not store changes, but states, it really does not make sense to use the term - "changesets" with git. + "changesets" with Git. [[def_checkout]]checkout:: The action of updating all or part of the @@ -52,7 +52,7 @@ [[def_cherry-picking]]cherry-picking:: In <<def_SCM,SCM>> jargon, "cherry pick" means to choose a subset of changes out of a series of changes (typically commits) and record them - as a new series of changes on top of a different codebase. In GIT, this is + as a new series of changes on top of a different codebase. In Git, this is performed by the "git cherry-pick" command to extract the change introduced by an existing <<def_commit,commit>> and to record it based on the tip of the current <<def_branch,branch>> as a new commit. @@ -64,14 +64,14 @@ [[def_commit]]commit:: As a noun: A single point in the - git history; the entire history of a project is represented as a + Git history; the entire history of a project is represented as a set of interrelated commits. The word "commit" is often - used by git in the same places other revision control systems + used by Git in the same places other revision control systems use the words "revision" or "version". Also used as a short hand for <<def_commit_object,commit object>>. + As a verb: The action of storing a new snapshot of the project's -state in the git history, by creating a new commit representing the current +state in the Git history, by creating a new commit representing the current state of the <<def_index,index>> and advancing <<def_HEAD,HEAD>> to point at the new commit. @@ -82,8 +82,20 @@ to point at the new commit. to the top <<def_directory,directory>> of the stored revision. -[[def_core_git]]core git:: - Fundamental data structures and utilities of git. Exposes only limited +[[def_commit-ish]]commit-ish (also committish):: + A <<def_commit_object,commit object>> or an + <<def_object,object>> that can be recursively dereferenced to + a commit object. + The following are all commit-ishes: + a commit object, + a <<def_tag_object,tag object>> that points to a commit + object, + a tag object that points to a tag object that points to a + commit object, + etc. + +[[def_core_git]]core Git:: + Fundamental data structures and utilities of Git. Exposes only limited source code management tools. [[def_DAG]]DAG:: @@ -100,12 +112,22 @@ to point at the new commit. [[def_detached_HEAD]]detached HEAD:: Normally the <<def_HEAD,HEAD>> stores the name of a - <<def_branch,branch>>. However, git also allows you to <<def_checkout,check out>> - an arbitrary <<def_commit,commit>> that isn't necessarily the tip of any - particular branch. In this case HEAD is said to be "detached". - -[[def_dircache]]dircache:: - You are *waaaaay* behind. See <<def_index,index>>. + <<def_branch,branch>>, and commands that operate on the + history HEAD represents operate on the history leading to the + tip of the branch the HEAD points at. However, Git also + allows you to <<def_checkout,check out>> an arbitrary + <<def_commit,commit>> that isn't necessarily the tip of any + particular branch. The HEAD in such a state is called + "detached". ++ +Note that commands that operate on the history of the current branch +(e.g. `git commit` to build a new history on top of it) still work +while the HEAD is detached. They update the HEAD to point at the tip +of the updated history without affecting any branch. Commands that +update or inquire information _about_ the current branch (e.g. `git +branch --set-upstream-to` that sets what remote-tracking branch the +current branch integrates with) obviously do not work, as there is no +(real) current branch to ask about in this state. [[def_directory]]directory:: The list you get with "ls" :-) @@ -115,11 +137,6 @@ to point at the new commit. it contains modifications which have not been <<def_commit,committed>> to the current <<def_branch,branch>>. -[[def_ent]]ent:: - Favorite synonym to "<<def_tree-ish,tree-ish>>" by some total geeks. See - `http://en.wikipedia.org/wiki/Ent_(Middle-earth)` for an in-depth - explanation. Avoid this term, not to confuse people. - [[def_evil_merge]]evil merge:: An evil merge is a <<def_merge,merge>> that introduces changes that do not appear in any <<def_parent,parent>>. @@ -142,27 +159,35 @@ to point at the new commit. and to get them, too. See also linkgit:git-fetch[1]. [[def_file_system]]file system:: - Linus Torvalds originally designed git to be a user space file system, + Linus Torvalds originally designed Git to be a user space file system, i.e. the infrastructure to hold files and directories. That ensured the - efficiency and speed of git. + efficiency and speed of Git. -[[def_git_archive]]git archive:: +[[def_git_archive]]Git archive:: Synonym for <<def_repository,repository>> (for arch people). +[[def_gitfile]]gitfile:: + A plain file `.git` at the root of a working tree that + points at the directory that is the real repository. + [[def_grafts]]grafts:: Grafts enables two otherwise different lines of development to be joined together by recording fake ancestry information for commits. This way - you can make git pretend the set of <<def_parent,parents>> a <<def_commit,commit>> has + you can make Git pretend the set of <<def_parent,parents>> a <<def_commit,commit>> has is different from what was recorded when the commit was created. Configured via the `.git/info/grafts` file. ++ +Note that the grafts mechanism is outdated and can lead to problems +transferring objects between repositories; see linkgit:git-replace[1] +for a more flexible and robust system to do the same thing. [[def_hash]]hash:: - In git's context, synonym to <<def_object_name,object name>>. + In Git's context, synonym for <<def_object_name,object name>>. [[def_head]]head:: A <<def_ref,named reference>> to the <<def_commit,commit>> at the tip of a - <<def_branch,branch>>. Heads are stored in - `$GIT_DIR/refs/heads/`, except when using packed refs. (See + <<def_branch,branch>>. Heads are stored in a file in + `$GIT_DIR/refs/heads/` directory, except when using packed refs. (See linkgit:git-pack-refs[1].) [[def_HEAD]]HEAD:: @@ -170,21 +195,21 @@ to point at the new commit. working tree>> is normally derived from the state of the tree referred to by HEAD. HEAD is a reference to one of the <<def_head,heads>> in your repository, except when using a - <<def_detached_HEAD,detached HEAD>>, in which case it may - reference an arbitrary commit. + <<def_detached_HEAD,detached HEAD>>, in which case it directly + references an arbitrary commit. [[def_head_ref]]head ref:: A synonym for <<def_head,head>>. [[def_hook]]hook:: - During the normal execution of several git commands, call-outs are made + During the normal execution of several Git commands, call-outs are made to optional scripts that allow a developer to add functionality or checking. Typically, the hooks allow for a command to be pre-verified and potentially aborted, and allow for a post-notification after the operation is done. The hook scripts are found in the `$GIT_DIR/hooks/` directory, and are enabled by simply removing the `.sample` suffix from the filename. In earlier versions - of git you had to make them executable. + of Git you had to make them executable. [[def_index]]index:: A collection of files with stat information, whose contents are stored @@ -201,7 +226,7 @@ to point at the new commit. [[def_master]]master:: The default development <<def_branch,branch>>. Whenever you - create a git <<def_repository,repository>>, a branch named + create a Git <<def_repository,repository>>, a branch named "master" is created, and becomes the active branch. In most cases, this contains the local development, though that is purely by convention and is not required. @@ -228,8 +253,8 @@ This commit is referred to as a "merge commit", or sometimes just a "merge". [[def_object]]object:: - The unit of storage in git. It is uniquely identified by the - <<def_SHA1,SHA1>> of its contents. Consequently, an + The unit of storage in Git. It is uniquely identified by the + <<def_SHA1,SHA-1>> of its contents. Consequently, an object can not be changed. [[def_object_database]]object database:: @@ -241,10 +266,9 @@ This commit is referred to as a "merge commit", or sometimes just a Synonym for <<def_object_name,object name>>. [[def_object_name]]object name:: - The unique identifier of an <<def_object,object>>. The <<def_hash,hash>> - of the object's contents using the Secure Hash Algorithm - 1 and usually represented by the 40 character hexadecimal encoding of - the <<def_hash,hash>> of the object. + The unique identifier of an <<def_object,object>>. The + object name is usually represented by a 40 character + hexadecimal string. Also colloquially called <<def_SHA1,SHA-1>>. [[def_object_type]]object type:: One of the identifiers "<<def_commit_object,commit>>", @@ -253,14 +277,13 @@ This commit is referred to as a "merge commit", or sometimes just a <<def_object,object>>. [[def_octopus]]octopus:: - To <<def_merge,merge>> more than two <<def_branch,branches>>. Also denotes an - intelligent predator. + To <<def_merge,merge>> more than two <<def_branch,branches>>. [[def_origin]]origin:: The default upstream <<def_repository,repository>>. Most projects have at least one upstream project which they track. By default 'origin' is used for that purpose. New upstream updates - will be fetched into remote <<def_remote_tracking_branch,remote-tracking branches>> named + will be fetched into <<def_remote_tracking_branch,remote-tracking branches>> named origin/name-of-upstream-branch, which you can see using `git branch -r`. @@ -273,6 +296,100 @@ This commit is referred to as a "merge commit", or sometimes just a <<def_pack,pack>>, to assist in efficiently accessing the contents of a pack. +[[def_pathspec]]pathspec:: + Pattern used to limit paths in Git commands. ++ +Pathspecs are used on the command line of "git ls-files", "git +ls-tree", "git add", "git grep", "git diff", "git checkout", +and many other commands to +limit the scope of operations to some subset of the tree or +worktree. See the documentation of each command for whether +paths are relative to the current directory or toplevel. The +pathspec syntax is as follows: ++ +-- + +* any path matches itself +* the pathspec up to the last slash represents a + directory prefix. The scope of that pathspec is + limited to that subtree. +* the rest of the pathspec is a pattern for the remainder + of the pathname. Paths relative to the directory + prefix will be matched against that pattern using fnmatch(3); + in particular, '*' and '?' _can_ match directory separators. + +-- ++ +For example, Documentation/*.jpg will match all .jpg files +in the Documentation subtree, +including Documentation/chapter_1/figure_1.jpg. ++ +A pathspec that begins with a colon `:` has special meaning. In the +short form, the leading colon `:` is followed by zero or more "magic +signature" letters (which optionally is terminated by another colon `:`), +and the remainder is the pattern to match against the path. +The "magic signature" consists of ASCII symbols that are neither +alphanumeric, glob, regex special characters nor colon. +The optional colon that terminates the "magic signature" can be +omitted if the pattern begins with a character that does not belong to +"magic signature" symbol set and is not a colon. ++ +In the long form, the leading colon `:` is followed by a open +parenthesis `(`, a comma-separated list of zero or more "magic words", +and a close parentheses `)`, and the remainder is the pattern to match +against the path. ++ +A pathspec with only a colon means "there is no pathspec". This form +should not be combined with other pathspec. ++ +-- +top;; + The magic word `top` (magic signature: `/`) makes the pattern + match from the root of the working tree, even when you are + running the command from inside a subdirectory. + +literal;; + Wildcards in the pattern such as `*` or `?` are treated + as literal characters. + +icase;; + Case insensitive match. + +glob;; + Git treats the pattern as a shell glob suitable for + consumption by fnmatch(3) with the FNM_PATHNAME flag: + wildcards in the pattern will not match a / in the pathname. + For example, "Documentation/{asterisk}.html" matches + "Documentation/git.html" but not "Documentation/ppc/ppc.html" + or "tools/perf/Documentation/perf.html". ++ +Two consecutive asterisks ("`**`") in patterns matched against +full pathname may have special meaning: + + - A leading "`**`" followed by a slash means match in all + directories. For example, "`**/foo`" matches file or directory + "`foo`" anywhere, the same as pattern "`foo`". "`**/foo/bar`" + matches file or directory "`bar`" anywhere that is directly + under directory "`foo`". + + - A trailing "`/**`" matches everything inside. For example, + "`abc/**`" matches all files inside directory "abc", relative + to the location of the `.gitignore` file, with infinite depth. + + - A slash followed by two consecutive asterisks then a slash + matches zero or more directories. For example, "`a/**/b`" + matches "`a/b`", "`a/x/b`", "`a/x/y/b`" and so on. + + - Other consecutive asterisks are considered invalid. ++ +Glob magic is incompatible with literal magic. + +exclude;; + After a path matches any non-exclude pathspec, it will be run + through all exclude pathspec (magic signature: `!`). If it + matches, the path is ignored. +-- + [[def_parent]]parent:: A <<def_commit_object,commit object>> contains a (possibly empty) list of the logical predecessor(s) in the line of development, i.e. its @@ -286,14 +403,36 @@ This commit is referred to as a "merge commit", or sometimes just a particular line of text. See linkgit:git-diff[1]. [[def_plumbing]]plumbing:: - Cute name for <<def_core_git,core git>>. + Cute name for <<def_core_git,core Git>>. [[def_porcelain]]porcelain:: Cute name for programs and program suites depending on - <<def_core_git,core git>>, presenting a high level access to - core git. Porcelains expose more of a <<def_SCM,SCM>> + <<def_core_git,core Git>>, presenting a high level access to + core Git. Porcelains expose more of a <<def_SCM,SCM>> interface than the <<def_plumbing,plumbing>>. +[[def_per_worktree_ref]]per-worktree ref:: + Refs that are per-<<def_working_tree,worktree>>, rather than + global. This is presently only <<def_HEAD,HEAD>> and any refs + that start with `refs/bisect/`, but might later include other + unusual refs. + +[[def_pseudoref]]pseudoref:: + Pseudorefs are a class of files under `$GIT_DIR` which behave + like refs for the purposes of rev-parse, but which are treated + specially by git. Pseudorefs both have names that are all-caps, + and always start with a line consisting of a + <<def_SHA1,SHA-1>> followed by whitespace. So, HEAD is not a + pseudoref, because it is sometimes a symbolic ref. They might + optionally contain some additional data. `MERGE_HEAD` and + `CHERRY_PICK_HEAD` are examples. Unlike + <<def_per_worktree_ref,per-worktree refs>>, these files cannot + be symbolic refs, and never have reflogs. They also cannot be + updated through the normal ref update machinery. Instead, + they are updated by directly writing to the files. However, + they can be read as if they were refs, so `git rev-parse + MERGE_HEAD` will work. + [[def_pull]]pull:: Pulling a <<def_branch,branch>> means to <<def_fetch,fetch>> it and <<def_merge,merge>> it. See also linkgit:git-pull[1]. @@ -326,9 +465,20 @@ This commit is referred to as a "merge commit", or sometimes just a to the result. [[def_ref]]ref:: - A 40-byte hex representation of a <<def_SHA1,SHA1>> or a name that - denotes a particular <<def_object,object>>. These may be stored in - `$GIT_DIR/refs/`. + A name that begins with `refs/` (e.g. `refs/heads/master`) + that points to an <<def_object_name,object name>> or another + ref (the latter is called a <<def_symref,symbolic ref>>). + For convenience, a ref can sometimes be abbreviated when used + as an argument to a Git command; see linkgit:gitrevisions[7] + for details. + Refs are stored in the <<def_repository,repository>>. ++ +The ref namespace is hierarchical. +Different subhierarchies are used for different purposes (e.g. the +`refs/heads/` hierarchy is used to represent local branches). ++ +There are a few special-purpose refs that do not begin with `refs/`. +The most notable example is `HEAD`. [[def_reflog]]reflog:: A reflog shows the local "history" of a ref. In other words, @@ -339,23 +489,21 @@ This commit is referred to as a "merge commit", or sometimes just a [[def_refspec]]refspec:: A "refspec" is used by <<def_fetch,fetch>> and <<def_push,push>> to describe the mapping between remote - <<def_ref,ref>> and local ref. They are combined with a colon in - the format <src>:<dst>, preceded by an optional plus sign, +. - For example: `git fetch $URL - refs/heads/master:refs/heads/origin` means "grab the master - <<def_branch,branch>> <<def_head,head>> from the $URL and store - it as my origin branch head". And `git push - $URL refs/heads/master:refs/heads/to-upstream` means "publish my - master branch head as to-upstream branch at $URL". See also - linkgit:git-push[1]. + <<def_ref,ref>> and local ref. + +[[def_remote]]remote repository:: + A <<def_repository,repository>> which is used to track the same + project but resides somewhere else. To communicate with remotes, + see <<def_fetch,fetch>> or <<def_push,push>>. [[def_remote_tracking_branch]]remote-tracking branch:: - A regular git <<def_branch,branch>> that is used to follow changes from - another <<def_repository,repository>>. A remote-tracking - branch should not contain direct modifications or have local commits - made to it. A remote-tracking branch can usually be - identified as the right-hand-side <<def_ref,ref>> in a Pull: - <<def_refspec,refspec>>. + A <<def_ref,ref>> that is used to follow changes from another + <<def_repository,repository>>. It typically looks like + 'refs/remotes/foo/bar' (indicating that it tracks a branch named + 'bar' in a remote named 'foo'), and matches the right-hand-side of + a configured fetch <<def_refspec,refspec>>. A remote-tracking + branch should not contain direct modifications or have local + commits made to it. [[def_repository]]repository:: A collection of <<def_ref,refs>> together with an @@ -370,9 +518,7 @@ This commit is referred to as a "merge commit", or sometimes just a <<def_merge,merge>> left behind. [[def_revision]]revision:: - A particular state of files and directories which was stored in the - <<def_object_database,object database>>. It is referenced by a - <<def_commit_object,commit object>>. + Synonym for <<def_commit,commit>> (the noun). [[def_rewind]]rewind:: To throw away part of the development, i.e. to assign the @@ -381,13 +527,19 @@ This commit is referred to as a "merge commit", or sometimes just a [[def_SCM]]SCM:: Source code management (tool). -[[def_SHA1]]SHA1:: - Synonym for <<def_object_name,object name>>. +[[def_SHA1]]SHA-1:: + "Secure Hash Algorithm 1"; a cryptographic hash function. + In the context of Git used as a synonym for <<def_object_name,object name>>. + +[[def_shallow_clone]]shallow clone:: + Mostly a synonym to <<def_shallow_repository,shallow repository>> + but the phrase makes it more explicit that it was created by + running `git clone --depth=...` command. [[def_shallow_repository]]shallow repository:: A shallow <<def_repository,repository>> has an incomplete history some of whose <<def_commit,commits>> have <<def_parent,parents>> cauterized away (in other - words, git is told to pretend that these commits do not have the + words, Git is told to pretend that these commits do not have the parents, even though they are recorded in the <<def_commit_object,commit object>>). This is sometimes useful when you are interested only in the recent history of a project even though the real history recorded in the @@ -395,8 +547,19 @@ This commit is referred to as a "merge commit", or sometimes just a is created by giving the `--depth` option to linkgit:git-clone[1], and its history can be later deepened with linkgit:git-fetch[1]. +[[def_submodule]]submodule:: + A <<def_repository,repository>> that holds the history of a + separate project inside another repository (the latter of + which is called <<def_superproject, superproject>>). + +[[def_superproject]]superproject:: + A <<def_repository,repository>> that references repositories + of other projects in its working tree as <<def_submodule,submodules>>. + The superproject knows about the names of (but does not hold + copies of) commit objects of the contained submodules. + [[def_symref]]symref:: - Symbolic reference: instead of containing the <<def_SHA1,SHA1>> + Symbolic reference: instead of containing the <<def_SHA1,SHA-1>> id itself, it is of the format 'ref: refs/some/thing' and when referenced, it recursively dereferences to this reference. '<<def_HEAD,HEAD>>' is a prime example of a symref. Symbolic @@ -404,14 +567,14 @@ This commit is referred to as a "merge commit", or sometimes just a command. [[def_tag]]tag:: - A <<def_ref,ref>> pointing to a <<def_tag_object,tag>> or - <<def_commit_object,commit object>>. In contrast to a <<def_head,head>>, - a tag is not changed by a <<def_commit,commit>>. Tags (not - <<def_tag_object,tag objects>>) are stored in `$GIT_DIR/refs/tags/`. A - git tag has nothing to do with a Lisp tag (which would be - called an <<def_object_type,object type>> in git's context). A - tag is most typically used to mark a particular point in the - commit ancestry <<def_chain,chain>>. + A <<def_ref,ref>> under `refs/tags/` namespace that points to an + object of an arbitrary type (typically a tag points to either a + <<def_tag_object,tag>> or a <<def_commit_object,commit object>>). + In contrast to a <<def_head,head>>, a tag is not updated by + the `commit` command. A Git tag has nothing to do with a Lisp + tag (which would be called an <<def_object_type,object type>> + in Git's context). A tag is most typically used to mark a particular + point in the commit ancestry <<def_chain,chain>>. [[def_tag_object]]tag object:: An <<def_object,object>> containing a <<def_ref,ref>> pointing to @@ -420,7 +583,7 @@ This commit is referred to as a "merge commit", or sometimes just a signature, in which case it is called a "signed tag object". [[def_topic_branch]]topic branch:: - A regular git <<def_branch,branch>> that is used by a developer to + A regular Git <<def_branch,branch>> that is used by a developer to identify a conceptual line of development. Since branches are very easy and inexpensive, it is often desirable to have several small branches that each contain very well defined concepts or small incremental yet @@ -436,10 +599,19 @@ This commit is referred to as a "merge commit", or sometimes just a with refs to the associated blob and/or tree objects. A <<def_tree,tree>> is equivalent to a <<def_directory,directory>>. -[[def_tree-ish]]tree-ish:: - A <<def_ref,ref>> pointing to either a <<def_commit_object,commit - object>>, a <<def_tree_object,tree object>>, or a <<def_tag_object,tag - object>> pointing to a tag or commit or tree object. +[[def_tree-ish]]tree-ish (also treeish):: + A <<def_tree_object,tree object>> or an <<def_object,object>> + that can be recursively dereferenced to a tree object. + Dereferencing a <<def_commit_object,commit object>> yields the + tree object corresponding to the <<def_revision,revision>>'s + top <<def_directory,directory>>. + The following are all tree-ishes: + a <<def_commit-ish,commit-ish>>, + a tree object, + a <<def_tag_object,tag object>> that points to a tree object, + a tag object that points to a tag object that points to a tree + object, + etc. [[def_unmerged_index]]unmerged index:: An <<def_index,index>> which contains unmerged |