391 lines
12 KiB
Plaintext
391 lines
12 KiB
Plaintext
git-interpret-trailers(1)
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=========================
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NAME
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----
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git-interpret-trailers - Add or parse structured information in commit messages
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SYNOPSIS
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--------
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[verse]
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'git interpret-trailers' [--in-place] [--trim-empty]
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[(--trailer (<key>|<key-alias>)[(=|:)<value>])...]
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[--parse] [<file>...]
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DESCRIPTION
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-----------
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Add or parse 'trailer' lines that look similar to RFC 822 e-mail
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headers, at the end of the otherwise free-form part of a commit
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message. For example, in the following commit message
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------------------------------------------------
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subject
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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
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Signed-off-by: Alice <alice@example.com>
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Signed-off-by: Bob <bob@example.com>
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------------------------------------------------
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the last two lines starting with "Signed-off-by" are trailers.
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This command reads commit messages from either the
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<file> arguments or the standard input if no <file> is specified.
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If `--parse` is specified, the output consists of the parsed trailers
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coming from the input, without influencing them with any command line
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options or configuration variables.
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Otherwise, this command applies `trailer.*` configuration variables
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(which could potentially add new trailers, as well as reposition them),
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as well as any command line arguments that can override configuration
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variables (such as `--trailer=...` which could also add new trailers),
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to each input file. The result is emitted on the standard output.
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This command can also operate on the output of linkgit:git-format-patch[1],
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which is more elaborate than a plain commit message. Namely, such output
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includes a commit message (as above), a "---" divider line, and a patch part.
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For these inputs, the divider and patch parts are not modified by
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this command and are emitted as is on the output, unless
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`--no-divider` is specified.
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Some configuration variables control the way the `--trailer` arguments
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are applied to each input and the way any existing trailer in
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the input is changed. They also make it possible to
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automatically add some trailers.
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By default, a '<key>=<value>' or '<key>:<value>' argument given
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using `--trailer` will be appended after the existing trailers only if
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the last trailer has a different (<key>, <value>) pair (or if there
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is no existing trailer). The <key> and <value> parts will be trimmed
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to remove starting and trailing whitespace, and the resulting trimmed
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<key> and <value> will appear in the output like this:
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------------------------------------------------
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key: value
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------------------------------------------------
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This means that the trimmed <key> and <value> will be separated by
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`': '` (one colon followed by one space).
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For convenience, a <key-alias> can be configured to make using `--trailer`
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shorter to type on the command line. This can be configured using the
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'trailer.<key-alias>.key' configuration variable. The <keyAlias> must be a prefix
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of the full <key> string, although case sensitivity does not matter. For
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example, if you have
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------------------------------------------------
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trailer.sign.key "Signed-off-by: "
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------------------------------------------------
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in your configuration, you only need to specify `--trailer="sign: foo"`
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on the command line instead of `--trailer="Signed-off-by: foo"`.
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By default the new trailer will appear at the end of all the existing
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trailers. If there is no existing trailer, the new trailer will appear
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at the end of the input. A blank line will be added before the new
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trailer if there isn't one already.
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Existing trailers are extracted from the input by looking for
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a group of one or more lines that (i) is all trailers, or (ii) contains at
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least one Git-generated or user-configured trailer and consists of at
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least 25% trailers.
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The group must be preceded by one or more empty (or whitespace-only) lines.
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The group must either be at the end of the input or be the last
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non-whitespace lines before a line that starts with '---' (followed by a
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space or the end of the line).
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When reading trailers, there can be no whitespace before or inside the
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<key>, but any number of regular space and tab characters are allowed
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between the <key> and the separator. There can be whitespaces before,
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inside or after the <value>. The <value> may be split over multiple lines
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with each subsequent line starting with at least one whitespace, like
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the "folding" in RFC 822. Example:
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------------------------------------------------
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key: This is a very long value, with spaces and
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newlines in it.
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------------------------------------------------
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Note that trailers do not follow (nor are they intended to follow) many of the
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rules for RFC 822 headers. For example they do not follow the encoding rule.
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OPTIONS
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-------
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--in-place::
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Edit the files in place.
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--trim-empty::
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If the <value> part of any trailer contains only whitespace,
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the whole trailer will be removed from the output.
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This applies to existing trailers as well as new trailers.
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--trailer <key>[(=|:)<value>]::
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Specify a (<key>, <value>) pair that should be applied as a
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trailer to the inputs. See the description of this
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command.
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--where <placement>::
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--no-where::
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Specify where all new trailers will be added. A setting
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provided with '--where' overrides the `trailer.where` and any
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applicable `trailer.<keyAlias>.where` configuration variables
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and applies to all '--trailer' options until the next occurrence of
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'--where' or '--no-where'. Upon encountering '--no-where', clear the
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effect of any previous use of '--where', such that the relevant configuration
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variables are no longer overridden. Possible placements are `after`,
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`before`, `end` or `start`.
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--if-exists <action>::
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--no-if-exists::
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Specify what action will be performed when there is already at
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least one trailer with the same <key> in the input. A setting
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provided with '--if-exists' overrides the `trailer.ifExists` and any
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applicable `trailer.<keyAlias>.ifExists` configuration variables
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and applies to all '--trailer' options until the next occurrence of
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'--if-exists' or '--no-if-exists'. Upon encountering '--no-if-exists, clear the
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effect of any previous use of '--if-exists, such that the relevant configuration
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variables are no longer overridden. Possible actions are `addIfDifferent`,
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`addIfDifferentNeighbor`, `add`, `replace` and `doNothing`.
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--if-missing <action>::
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--no-if-missing::
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Specify what action will be performed when there is no other
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trailer with the same <key> in the input. A setting
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provided with '--if-missing' overrides the `trailer.ifMissing` and any
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applicable `trailer.<keyAlias>.ifMissing` configuration variables
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and applies to all '--trailer' options until the next occurrence of
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'--if-missing' or '--no-if-missing'. Upon encountering '--no-if-missing,
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clear the effect of any previous use of '--if-missing, such that the relevant
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configuration variables are no longer overridden. Possible actions are `doNothing`
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or `add`.
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--only-trailers::
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Output only the trailers, not any other parts of the input.
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--only-input::
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Output only trailers that exist in the input; do not add any
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from the command-line or by applying `trailer.*` configuration
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variables.
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--unfold::
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If a trailer has a value that runs over multiple lines (aka "folded"),
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reformat the value into a single line.
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--parse::
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A convenience alias for `--only-trailers --only-input
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--unfold`. This makes it easier to only see the trailers coming from the
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input without influencing them with any command line options or
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configuration variables, while also making the output machine-friendly with
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--unfold.
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--no-divider::
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Do not treat `---` as the end of the commit message. Use this
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when you know your input contains just the commit message itself
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(and not an email or the output of `git format-patch`).
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CONFIGURATION VARIABLES
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-----------------------
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include::includes/cmd-config-section-all.adoc[]
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include::config/trailer.adoc[]
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EXAMPLES
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--------
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* Configure a 'sign' trailer with a 'Signed-off-by' key, and then
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add two of these trailers to a commit message file:
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+
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------------
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$ git config trailer.sign.key "Signed-off-by"
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$ cat msg.txt
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subject
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body text
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$ git interpret-trailers --trailer 'sign: Alice <alice@example.com>' --trailer 'sign: Bob <bob@example.com>' <msg.txt
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subject
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body text
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Signed-off-by: Alice <alice@example.com>
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Signed-off-by: Bob <bob@example.com>
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------------
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* Use the `--in-place` option to edit a commit message file in place:
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+
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------------
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$ cat msg.txt
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subject
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body text
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Signed-off-by: Bob <bob@example.com>
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$ git interpret-trailers --trailer 'Acked-by: Alice <alice@example.com>' --in-place msg.txt
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$ cat msg.txt
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subject
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body text
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Signed-off-by: Bob <bob@example.com>
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Acked-by: Alice <alice@example.com>
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------------
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* Extract the last commit as a patch, and add a 'Cc' and a
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'Reviewed-by' trailer to it:
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------------
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$ git format-patch -1
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0001-foo.patch
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$ git interpret-trailers --trailer 'Cc: Alice <alice@example.com>' --trailer 'Reviewed-by: Bob <bob@example.com>' 0001-foo.patch >0001-bar.patch
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------------
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* Configure a 'sign' trailer with a command to automatically add a
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'Signed-off-by: ' with the author information only if there is no
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'Signed-off-by: ' already, and show how it works:
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+
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------------
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$ cat msg1.txt
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subject
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body text
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$ git config trailer.sign.key "Signed-off-by: "
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$ git config trailer.sign.ifmissing add
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$ git config trailer.sign.ifexists doNothing
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$ git config trailer.sign.cmd 'echo "$(git config user.name) <$(git config user.email)>"'
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$ git interpret-trailers --trailer sign <msg1.txt
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subject
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body text
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Signed-off-by: Bob <bob@example.com>
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$ cat msg2.txt
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subject
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body text
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Signed-off-by: Alice <alice@example.com>
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$ git interpret-trailers --trailer sign <msg2.txt
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subject
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body text
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Signed-off-by: Alice <alice@example.com>
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------------
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* Configure a 'fix' trailer with a key that contains a '#' and no
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space after this character, and show how it works:
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+
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------------
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$ git config trailer.separators ":#"
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$ git config trailer.fix.key "Fix #"
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$ echo "subject" | git interpret-trailers --trailer fix=42
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subject
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Fix #42
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------------
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* Configure a 'help' trailer with a cmd use a script `glog-find-author`
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which search specified author identity from git log in git repository
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and show how it works:
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+
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------------
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$ cat ~/bin/glog-find-author
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#!/bin/sh
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test -n "$1" && git log --author="$1" --pretty="%an <%ae>" -1 || true
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$ cat msg.txt
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subject
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body text
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$ git config trailer.help.key "Helped-by: "
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$ git config trailer.help.ifExists "addIfDifferentNeighbor"
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$ git config trailer.help.cmd "~/bin/glog-find-author"
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$ git interpret-trailers --trailer="help:Junio" --trailer="help:Couder" <msg.txt
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subject
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body text
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Helped-by: Junio C Hamano <gitster@pobox.com>
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Helped-by: Christian Couder <christian.couder@gmail.com>
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------------
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* Configure a 'ref' trailer with a cmd use a script `glog-grep`
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to grep last relevant commit from git log in the git repository
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and show how it works:
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+
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------------
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$ cat ~/bin/glog-grep
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#!/bin/sh
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test -n "$1" && git log --grep "$1" --pretty=reference -1 || true
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$ cat msg.txt
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subject
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body text
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$ git config trailer.ref.key "Reference-to: "
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$ git config trailer.ref.ifExists "replace"
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$ git config trailer.ref.cmd "~/bin/glog-grep"
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$ git interpret-trailers --trailer="ref:Add copyright notices." <msg.txt
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subject
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body text
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Reference-to: 8bc9a0c769 (Add copyright notices., 2005-04-07)
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------------
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* Configure a 'see' trailer with a command to show the subject of a
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commit that is related, and show how it works:
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+
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------------
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$ cat msg.txt
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subject
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body text
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see: HEAD~2
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$ cat ~/bin/glog-ref
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#!/bin/sh
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git log -1 --oneline --format="%h (%s)" --abbrev-commit --abbrev=14
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$ git config trailer.see.key "See-also: "
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$ git config trailer.see.ifExists "replace"
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$ git config trailer.see.ifMissing "doNothing"
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$ git config trailer.see.cmd "glog-ref"
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$ git interpret-trailers --trailer=see <msg.txt
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subject
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body text
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See-also: fe3187489d69c4 (subject of related commit)
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------------
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* Configure a commit template with some trailers with empty values
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(using sed to show and keep the trailing spaces at the end of the
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trailers), then configure a commit-msg hook that uses
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'git interpret-trailers' to remove trailers with empty values and
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to add a 'git-version' trailer:
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+
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------------
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$ cat temp.txt
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***subject***
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***message***
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Fixes: Z
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Cc: Z
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Reviewed-by: Z
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Signed-off-by: Z
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$ sed -e 's/ Z$/ /' temp.txt > commit_template.txt
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$ git config commit.template commit_template.txt
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$ cat .git/hooks/commit-msg
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#!/bin/sh
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git interpret-trailers --trim-empty --trailer "git-version: \$(git describe)" "\$1" > "\$1.new"
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mv "\$1.new" "\$1"
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$ chmod +x .git/hooks/commit-msg
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------------
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SEE ALSO
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--------
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linkgit:git-commit[1], linkgit:git-format-patch[1], linkgit:git-config[1]
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GIT
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---
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Part of the linkgit:git[1] suite
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