338 lines
10 KiB
Plaintext
338 lines
10 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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[verse]
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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 the underlying 'git rev-list' command they use internally
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and flags and parameters for the other commands they use
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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-dashdash::
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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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--stop-at-non-option::
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Only meaningful in `--parseopt` mode. Lets the option parser stop at
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the first non-option argument. This can be used to parse sub-commands
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that take options themselves.
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--sq-quote::
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Use 'git rev-parse' in shell quoting mode (see SQ-QUOTE
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section below). In contrast to the `--sq` option below, this
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mode does only quoting. Nothing else is done to command input.
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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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Verify that exactly one parameter is provided, and that it
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can be turned into a raw 20-byte SHA-1 that can be used to
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access the object database. If so, emit it to the standard
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output; otherwise, error out.
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+
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If you want to make sure that the output actually names an object in
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your object database and/or can be used as a specific type of object
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you require, you can add "^{type}" peeling operator to the parmeter.
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For example, `git rev-parse "$VAR^{commit}"` will make sure `$VAR`
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names an existing object that is a commit-ish (i.e. a commit, or an
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annotated tag that points at a commit). To make sure that `$VAR`
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names an existing object of any type, `git rev-parse "$VAR^{object}"`
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can be used.
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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-{asterisk}'). In contrast to the `--sq-quote` option,
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the command input is still interpreted as usual.
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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 SHA-1 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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--abbrev-ref[=(strict|loose)]::
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A non-ambiguous short name of the objects name.
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The option core.warnAmbiguousRefs is used to select the strict
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abbreviation mode.
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--disambiguate=<prefix>::
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Show every object whose name begins with the given prefix.
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The <prefix> must be at least 4 hexadecimal digits long to
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avoid listing each and every object in the repository by
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mistake.
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--all::
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Show all refs found in `refs/`.
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--branches[=pattern]::
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--tags[=pattern]::
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--remotes[=pattern]::
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Show all branches, tags, or remote-tracking branches,
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respectively (i.e., refs found in `refs/heads`,
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`refs/tags`, or `refs/remotes`, respectively).
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If a `pattern` is given, only refs matching the given shell glob are
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shown. If the pattern does not contain a globbing character (`?`,
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`*`, or `[`), it is turned into a prefix match by appending `/*`.
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--glob=pattern::
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Show all refs matching the shell glob pattern `pattern`. If
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the pattern does not start with `refs/`, this is automatically
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prepended. If the pattern does not contain a globbing
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character (`?`, `*`, or `[`), it is turned into a prefix
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match by appending `/*`.
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--show-toplevel::
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Show the absolute path of the top-level directory.
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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 `$GIT_DIR` if defined. Otherwise show the path to
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the .git directory. The path shown, when relative, is
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relative to the current working directory.
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If `$GIT_DIR` is not defined and the current directory
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is not detected to lie in a Git repository or work tree
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print a message to stderr and exit with nonzero status.
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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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--local-env-vars::
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List the GIT_* environment variables that are local to the
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repository (e.g. GIT_DIR or GIT_WORK_TREE, but not GIT_EDITOR).
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Only the names of the variables are listed, not their value,
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even if they are set.
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--short::
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--short=number::
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Instead of outputting the full SHA-1 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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Parse the date string, and output the corresponding
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--max-age= parameter for 'git rev-list'.
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--until=datestring::
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--before=datestring::
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Parse the date string, and output the corresponding
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--min-age= parameter for 'git rev-list'.
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<args>...::
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Flags and parameters to be parsed.
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--resolve-git-dir <path>::
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Check if <path> is a valid repository or a gitfile that
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points at a valid repository, and print the location of the
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repository. If <path> is a gitfile then the resolved path
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to the real repository is printed.
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include::revisions.txt[]
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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 string 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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Note: Make sure you quote the result when passing it to `eval`. See
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below for an example.
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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 $?)"
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------------
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SQ-QUOTE
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--------
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In `--sq-quote` mode, 'git rev-parse' echoes on the standard output a
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single line suitable for `sh(1)` `eval`. This line is made by
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normalizing the arguments following `--sq-quote`. Nothing other than
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quoting the arguments is done.
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If you want command input to still be interpreted as usual by
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'git rev-parse' before the output is shell quoted, see the `--sq`
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option.
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Example
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~~~~~~~
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------------
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$ cat >your-git-script.sh <<\EOF
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#!/bin/sh
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args=$(git rev-parse --sq-quote "$@") # quote user-supplied arguments
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command="git frotz -n24 $args" # and use it inside a handcrafted
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# command line
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eval "$command"
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EOF
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$ sh your-git-script.sh "a b'c"
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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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$ git rev-parse --verify HEAD
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------------
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* Print the commit object name from the revision in the $REV shell variable:
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------------
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$ git rev-parse --verify $REV^{commit}
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------------
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This will error out if $REV is empty or not a valid revision.
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* Similar to above:
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------------
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$ git rev-parse --default master --verify $REV
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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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GIT
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---
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Part of the linkgit:git[1] suite
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