428 lines
14 KiB
Plaintext
428 lines
14 KiB
Plaintext
git-rev-parse(1)
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================
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NAME
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----
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git-rev-parse - Pick out and massage parameters
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SYNOPSIS
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--------
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'git-rev-parse' [ --option ] <args>...
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DESCRIPTION
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-----------
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Many git porcelainish commands take mixture of flags
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(i.e. parameters that begin with a dash '-') and parameters
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meant for underlying `git-rev-list` command they use internally
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and flags and parameters for other commands they use as the
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downstream of `git-rev-list`. This command is used to
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distinguish between them.
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OPTIONS
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-------
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--parseopt::
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Use `git-rev-parse` in option parsing mode (see PARSEOPT section below).
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--keep-dash-dash::
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Only meaningful in `--parseopt` mode. Tells the option parser to echo
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out the first `--` met instead of skipping it.
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--revs-only::
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Do not output flags and parameters not meant for
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`git-rev-list` command.
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--no-revs::
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Do not output flags and parameters meant for
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`git-rev-list` command.
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--flags::
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Do not output non-flag parameters.
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--no-flags::
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Do not output flag parameters.
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--default <arg>::
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If there is no parameter given by the user, use `<arg>`
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instead.
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--verify::
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The parameter given must be usable as a single, valid
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object name. Otherwise barf and abort.
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-q::
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--quiet::
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Only meaningful in `--verify` mode. Do not output an error
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message if the first argument is not a valid object name;
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instead exit with non-zero status silently.
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--sq::
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Usually the output is made one line per flag and
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parameter. This option makes output a single line,
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properly quoted for consumption by shell. Useful when
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you expect your parameter to contain whitespaces and
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newlines (e.g. when using pickaxe `-S` with
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`git-diff-\*`).
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--not::
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When showing object names, prefix them with '{caret}' and
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strip '{caret}' prefix from the object names that already have
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one.
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--symbolic::
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Usually the object names are output in SHA1 form (with
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possible '{caret}' prefix); this option makes them output in a
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form as close to the original input as possible.
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--symbolic-full-name::
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This is similar to \--symbolic, but it omits input that
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are not refs (i.e. branch or tag names; or more
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explicitly disambiguating "heads/master" form, when you
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want to name the "master" branch when there is an
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unfortunately named tag "master"), and show them as full
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refnames (e.g. "refs/heads/master").
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--all::
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Show all refs found in `$GIT_DIR/refs`.
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--branches::
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Show branch refs found in `$GIT_DIR/refs/heads`.
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--tags::
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Show tag refs found in `$GIT_DIR/refs/tags`.
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--remotes::
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Show tag refs found in `$GIT_DIR/refs/remotes`.
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--show-prefix::
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When the command is invoked from a subdirectory, show the
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path of the current directory relative to the top-level
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directory.
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--show-cdup::
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When the command is invoked from a subdirectory, show the
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path of the top-level directory relative to the current
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directory (typically a sequence of "../", or an empty string).
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--git-dir::
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Show `$GIT_DIR` if defined else show the path to the .git directory.
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--is-inside-git-dir::
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When the current working directory is below the repository
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directory print "true", otherwise "false".
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--is-inside-work-tree::
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When the current working directory is inside the work tree of the
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repository print "true", otherwise "false".
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--is-bare-repository::
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When the repository is bare print "true", otherwise "false".
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--short::
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--short=number::
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Instead of outputting the full SHA1 values of object names try to
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abbreviate them to a shorter unique name. When no length is specified
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7 is used. The minimum length is 4.
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--since=datestring::
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--after=datestring::
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Parses the date string, and outputs corresponding
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--max-age= parameter for git-rev-list command.
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--until=datestring::
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--before=datestring::
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Parses the date string, and outputs corresponding
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--min-age= parameter for git-rev-list command.
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<args>...::
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Flags and parameters to be parsed.
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SPECIFYING REVISIONS
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--------------------
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A revision parameter typically, but not necessarily, names a
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commit object. They use what is called an 'extended SHA1'
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syntax. Here are various ways to spell object names. The
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ones listed near the end of this list are to name trees and
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blobs contained in a commit.
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* The full SHA1 object name (40-byte hexadecimal string), or
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a substring of such that is unique within the repository.
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E.g. dae86e1950b1277e545cee180551750029cfe735 and dae86e both
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name the same commit object if there are no other object in
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your repository whose object name starts with dae86e.
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* An output from `git-describe`; i.e. a closest tag, followed by a
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dash, a `g`, and an abbreviated object name.
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* A symbolic ref name. E.g. 'master' typically means the commit
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object referenced by $GIT_DIR/refs/heads/master. If you
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happen to have both heads/master and tags/master, you can
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explicitly say 'heads/master' to tell git which one you mean.
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When ambiguous, a `<name>` is disambiguated by taking the
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first match in the following rules:
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. if `$GIT_DIR/<name>` exists, that is what you mean (this is usually
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useful only for `HEAD`, `FETCH_HEAD` and `MERGE_HEAD`);
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. otherwise, `$GIT_DIR/refs/<name>` if exists;
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. otherwise, `$GIT_DIR/refs/tags/<name>` if exists;
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. otherwise, `$GIT_DIR/refs/heads/<name>` if exists;
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. otherwise, `$GIT_DIR/refs/remotes/<name>` if exists;
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. otherwise, `$GIT_DIR/refs/remotes/<name>/HEAD` if exists.
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* A ref followed by the suffix '@' with a date specification
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enclosed in a brace
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pair (e.g. '\{yesterday\}', '\{1 month 2 weeks 3 days 1 hour 1
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second ago\}' or '\{1979-02-26 18:30:00\}') to specify the value
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of the ref at a prior point in time. This suffix may only be
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used immediately following a ref name and the ref must have an
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existing log ($GIT_DIR/logs/<ref>). Note that this looks up the state
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of your *local* ref at a given time; e.g., what was in your local
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`master` branch last week. If you want to look at commits made during
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certain times, see `--since` and `--until`.
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* A ref followed by the suffix '@' with an ordinal specification
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enclosed in a brace pair (e.g. '\{1\}', '\{15\}') to specify
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the n-th prior value of that ref. For example 'master@\{1\}'
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is the immediate prior value of 'master' while 'master@\{5\}'
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is the 5th prior value of 'master'. This suffix may only be used
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immediately following a ref name and the ref must have an existing
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log ($GIT_DIR/logs/<ref>).
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* You can use the '@' construct with an empty ref part to get at a
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reflog of the current branch. For example, if you are on the
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branch 'blabla', then '@\{1\}' means the same as 'blabla@\{1\}'.
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* A suffix '{caret}' to a revision parameter means the first parent of
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that commit object. '{caret}<n>' means the <n>th parent (i.e.
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'rev{caret}'
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is equivalent to 'rev{caret}1'). As a special rule,
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'rev{caret}0' means the commit itself and is used when 'rev' is the
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object name of a tag object that refers to a commit object.
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* A suffix '{tilde}<n>' to a revision parameter means the commit
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object that is the <n>th generation grand-parent of the named
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commit object, following only the first parent. I.e. rev~3 is
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equivalent to rev{caret}{caret}{caret} which is equivalent to
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rev{caret}1{caret}1{caret}1. See below for a illustration of
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the usage of this form.
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* A suffix '{caret}' followed by an object type name enclosed in
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brace pair (e.g. `v0.99.8{caret}\{commit\}`) means the object
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could be a tag, and dereference the tag recursively until an
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object of that type is found or the object cannot be
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dereferenced anymore (in which case, barf). `rev{caret}0`
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introduced earlier is a short-hand for `rev{caret}\{commit\}`.
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* A suffix '{caret}' followed by an empty brace pair
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(e.g. `v0.99.8{caret}\{\}`) means the object could be a tag,
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and dereference the tag recursively until a non-tag object is
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found.
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* A colon, followed by a slash, followed by a text: this names
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a commit whose commit message starts with the specified text.
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This name returns the youngest matching commit which is
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reachable from any ref. If the commit message starts with a
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'!', you have to repeat that; the special sequence ':/!',
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followed by something else than '!' is reserved for now.
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* A suffix ':' followed by a path; this names the blob or tree
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at the given path in the tree-ish object named by the part
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before the colon.
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* A colon, optionally followed by a stage number (0 to 3) and a
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colon, followed by a path; this names a blob object in the
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index at the given path. Missing stage number (and the colon
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that follows it) names a stage 0 entry. During a merge, stage
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1 is the common ancestor, stage 2 is the target branch's version
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(typically the current branch), and stage 3 is the version from
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the branch being merged.
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Here is an illustration, by Jon Loeliger. Both commit nodes B
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and C are parents of commit node A. Parent commits are ordered
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left-to-right.
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........................................
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G H I J
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\ / \ /
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D E F
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\ | / \
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\ | / |
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\|/ |
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B C
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\ /
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\ /
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A
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........................................
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A = = A^0
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B = A^ = A^1 = A~1
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C = A^2 = A^2
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D = A^^ = A^1^1 = A~2
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E = B^2 = A^^2
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F = B^3 = A^^3
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G = A^^^ = A^1^1^1 = A~3
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H = D^2 = B^^2 = A^^^2 = A~2^2
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I = F^ = B^3^ = A^^3^
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J = F^2 = B^3^2 = A^^3^2
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SPECIFYING RANGES
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-----------------
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History traversing commands such as `git-log` operate on a set
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of commits, not just a single commit. To these commands,
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specifying a single revision with the notation described in the
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previous section means the set of commits reachable from that
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commit, following the commit ancestry chain.
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To exclude commits reachable from a commit, a prefix `{caret}`
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notation is used. E.g. "`{caret}r1 r2`" means commits reachable
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from `r2` but exclude the ones reachable from `r1`.
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This set operation appears so often that there is a shorthand
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for it. "`r1..r2`" is equivalent to "`{caret}r1 r2`". It is
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the difference of two sets (subtract the set of commits
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reachable from `r1` from the set of commits reachable from
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`r2`).
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A similar notation "`r1\...r2`" is called symmetric difference
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of `r1` and `r2` and is defined as
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"`r1 r2 --not $(git-merge-base --all r1 r2)`".
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It is the set of commits that are reachable from either one of
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`r1` or `r2` but not from both.
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Two other shorthands for naming a set that is formed by a commit
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and its parent commits exist. The `r1{caret}@` notation means all
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parents of `r1`. `r1{caret}!` includes commit `r1` but excludes
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all of its parents.
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Here are a handful of examples:
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D G H D
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D F G H I J D F
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^G D H D
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^D B E I J F B
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B...C G H D E B C
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^D B C E I J F B C
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C^@ I J F
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F^! D G H D F
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PARSEOPT
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--------
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In `--parseopt` mode, `git-rev-parse` helps massaging options to bring to shell
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scripts the same facilities C builtins have. It works as an option normalizer
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(e.g. splits single switches aggregate values), a bit like `getopt(1)` does.
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It takes on the standard input the specification of the options to parse and
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understand, and echoes on the standard output a line suitable for `sh(1)` `eval`
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to replace the arguments with normalized ones. In case of error, it outputs
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usage on the standard error stream, and exits with code 129.
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Input Format
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~~~~~~~~~~~~
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`git-rev-parse --parseopt` input format is fully text based. It has two parts,
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separated by a line that contains only `--`. The lines before the separator
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(should be more than one) are used for the usage.
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The lines after the separator describe the options.
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Each line of options has this format:
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------------
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<opt_spec><flags>* SP+ help LF
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------------
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`<opt_spec>`::
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its format is the short option character, then the long option name
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separated by a comma. Both parts are not required, though at least one
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is necessary. `h,help`, `dry-run` and `f` are all three correct
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`<opt_spec>`.
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`<flags>`::
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`<flags>` are of `*`, `=`, `?` or `!`.
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* Use `=` if the option takes an argument.
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* Use `?` to mean that the option is optional (though its use is discouraged).
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* Use `*` to mean that this option should not be listed in the usage
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generated for the `-h` argument. It's shown for `--help-all` as
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documented in linkgit:gitcli[7].
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* Use `!` to not make the corresponding negated long option available.
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The remainder of the line, after stripping the spaces, is used
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as the help associated to the option.
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Blank lines are ignored, and lines that don't match this specification are used
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as option group headers (start the line with a space to create such
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lines on purpose).
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Example
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~~~~~~~
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------------
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OPTS_SPEC="\
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some-command [options] <args>...
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some-command does foo and bar!
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--
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h,help show the help
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foo some nifty option --foo
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bar= some cool option --bar with an argument
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An option group Header
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C? option C with an optional argument"
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eval `echo "$OPTS_SPEC" | git-rev-parse --parseopt -- "$@" || echo exit $?`
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------------
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EXAMPLES
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--------
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* Print the object name of the current commit:
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+
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------------
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$ git rev-parse --verify HEAD
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------------
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* Print the commit object name from the revision in the $REV shell variable:
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+
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------------
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$ git rev-parse --verify $REV
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------------
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+
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This will error out if $REV is empty or not a valid revision.
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* Same as above:
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+
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------------
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$ git rev-parse --default master --verify $REV
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------------
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+
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but if $REV is empty, the commit object name from master will be printed.
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org> .
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Junio C Hamano <junkio@cox.net> and Pierre Habouzit <madcoder@debian.org>
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Documentation
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--------------
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Documentation by 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 linkgit:git[1] suite
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