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442 lines
13 KiB
442 lines
13 KiB
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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Operation Modes |
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~~~~~~~~~~~~~~~ |
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Each of these options must appear first on the command line. |
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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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--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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Options for --parseopt |
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~~~~~~~~~~~~~~~~~~~~~~ |
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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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--stuck-long:: |
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Only meaningful in `--parseopt` mode. Output the options in their |
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long form if available, and with their arguments stuck. |
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Options for Filtering |
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~~~~~~~~~~~~~~~~~~~~~ |
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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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Options for Output |
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~~~~~~~~~~~~~~~~~~ |
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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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--prefix <arg>:: |
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Behave as if 'git rev-parse' was invoked from the `<arg>` |
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subdirectory of the working tree. Any relative filenames are |
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resolved as if they are prefixed by `<arg>` and will be printed |
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in that form. |
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+ |
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This can be used to convert arguments to a command run in a subdirectory |
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so that they can still be used after moving to the top-level of the |
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repository. For example: |
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+ |
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---- |
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prefix=$(git rev-parse --show-prefix) |
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cd "$(git rev-parse --show-toplevel)" |
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eval "set -- $(git rev-parse --sq --prefix "$prefix" "$@")" |
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---- |
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--verify:: |
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Verify that exactly one parameter is provided, and that it |
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can be turned into a raw 20-byte SHA-1 that can be used to |
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access the object database. If so, emit it to the standard |
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output; otherwise, error out. |
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+ |
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If you want to make sure that the output actually names an object in |
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your object database and/or can be used as a specific type of object |
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you require, you can add the `^{type}` peeling operator to the parameter. |
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For example, `git rev-parse "$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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SHA-1s for valid object names are printed to stdout on success. |
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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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--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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--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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--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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Options for Objects |
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~~~~~~~~~~~~~~~~~~~ |
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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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+ |
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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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--exclude=<glob-pattern>:: |
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Do not include refs matching '<glob-pattern>' that the next `--all`, |
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`--branches`, `--tags`, `--remotes`, or `--glob` would otherwise |
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consider. Repetitions of this option accumulate exclusion patterns |
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up to the next `--all`, `--branches`, `--tags`, `--remotes`, or |
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`--glob` option (other options or arguments do not clear |
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accumulated patterns). |
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+ |
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The patterns given should not begin with `refs/heads`, `refs/tags`, or |
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`refs/remotes` when applied to `--branches`, `--tags`, or `--remotes`, |
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respectively, and they must begin with `refs/` when applied to `--glob` |
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or `--all`. If a trailing '/{asterisk}' is intended, it must be given |
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explicitly. |
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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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Options for Files |
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~~~~~~~~~~~~~~~~~ |
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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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--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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+ |
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If `$GIT_DIR` is not defined and the current directory |
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is not detected to lie in a Git repository or work tree |
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print a message to stderr and exit with nonzero status. |
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--git-common-dir:: |
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Show `$GIT_COMMON_DIR` if defined, else `$GIT_DIR`. |
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--is-inside-git-dir:: |
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When the current working directory is below the repository |
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directory print "true", otherwise "false". |
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--is-inside-work-tree:: |
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When the current working directory is inside the work tree of the |
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repository print "true", otherwise "false". |
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--is-bare-repository:: |
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When the repository is bare print "true", otherwise "false". |
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--resolve-git-dir <path>:: |
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Check if <path> is a valid repository or a gitfile that |
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points at a valid repository, and print the location of the |
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repository. If <path> is a gitfile then the resolved path |
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to the real repository is printed. |
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--git-path <path>:: |
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Resolve "$GIT_DIR/<path>" and takes other path relocation |
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variables such as $GIT_OBJECT_DIRECTORY, |
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$GIT_INDEX_FILE... into account. For example, if |
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$GIT_OBJECT_DIRECTORY is set to /foo/bar then "git rev-parse |
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--git-path objects/abc" returns /foo/bar/abc. |
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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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--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-toplevel:: |
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Show the absolute path of the top-level directory. |
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--shared-index-path:: |
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Show the path to the shared index file in split index mode, or |
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empty if not in split-index mode. |
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Other Options |
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~~~~~~~~~~~~~ |
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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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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 one or more) 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>*<arg-hint>? 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. May not contain any of the `<flags>` characters. |
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`h,help`, `dry-run` and `f` are examples of correct `<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 takes an optional argument. You |
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probably want to use the `--stuck-long` mode to be able to |
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unambiguously parse the optional argument. |
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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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`<arg-hint>`:: |
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`<arg-hint>`, if specified, is used as a name of the argument in the |
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help output, for options that take arguments. `<arg-hint>` is |
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terminated by the first whitespace. It is customary to use a |
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dash to separate words in a multi-word argument hint. |
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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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baz=arg another cool option --baz with a named argument |
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qux?path qux may take a path argument but has meaning by itself |
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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 $?)" |
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------------ |
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Usage text |
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~~~~~~~~~~ |
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When `"$@"` is `-h` or `--help` in the above example, the following |
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usage text would be shown: |
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------------ |
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usage: some-command [options] <args>... |
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some-command does foo and bar! |
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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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--baz <arg> another cool option --baz with a named argument |
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--qux[=<path>] qux may take a path argument but has meaning by itself |
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An option group Header |
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-C[...] option C with an optional argument |
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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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------------ |
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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^{commit} |
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------------ |
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+ |
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This will error out if $REV is empty or not a valid revision. |
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* Similar to above: |
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+ |
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------------ |
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$ 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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GIT |
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--- |
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Part of the linkgit:git[1] suite
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