572d5992af
An HTTP server may reasonably want to redirect e.g. http to https, so use -L to instruct curl to follow such a redirect. Change-Id: Ie8d9caee68330335fc1e915c5e87d9191f29ea65
110 lines
3.4 KiB
Plaintext
110 lines
3.4 KiB
Plaintext
commit-msg Hook
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===============
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NAME
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----
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commit-msg - Edit commit messages to insert a `Change-Id` tag.
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DESCRIPTION
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-----------
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A Git hook automatically invoked by `git commit`, and most other
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commit creation tools such as `git citool` or `git gui`. The Gerrit
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Code Review supplied implementation of this hook is a short shell
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script which automatically inserts a globally unique Change-Id tag
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in the footer of a commit message. When present, Gerrit uses this
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tag to track commits across cherry-picks and rebases.
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After the hook has been installed in the user's local Git repository
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for a project, the hook will modify a commit message such as:
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----
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Improve foo widget by attaching a bar.
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We want a bar, because it improves the foo by providing more
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wizbangery to the dowhatimeanery.
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Signed-off-by: A. U. Thor <author@example.com>
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----
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by inserting a new `Change-Id: ` line in the footer:
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----
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Improve foo widget by attaching a bar.
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We want a bar, because it improves the foo by providing more
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wizbangery to the dowhatimeanery.
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Change-Id: Ic8aaa0728a43936cd4c6e1ed590e01ba8f0fbf5b
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Signed-off-by: A. U. Thor <author@example.com>
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----
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The hook implementation is reasonably intelligent at inserting the
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Change-Id line before any Signed-off-by or Acked-by lines placed
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at the end of the commit message by the author, but if no such
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lines are present then it will just insert a blank line, and add
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the Change-Id at the bottom of the message.
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If a Change-Id line is already present in the message footer, the
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script will do nothing, leaving the existing Change-Id unmodified.
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This permits amending an existing commit, or allows the user to
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insert the Change-Id manually after copying it from an existing
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change viewed on the web.
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OBTAINING
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---------
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To obtain the 'commit-msg' script use scp, wget or curl to download it
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to your local system from your Gerrit server.
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You can use either of the below commands:
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====
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$ scp -p -P 29418 <your username>@<your Gerrit review server>:hooks/commit-msg <local path to your git>/.git/hooks/
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$ curl -Lo <local path to your git>/.git/hooks/commit-msg <your Gerrit http URL>/tools/hooks/commit-msg
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====
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A specific example of this might look something like this:
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.Example
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====
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$ scp -p -P 29418 john.doe@review.example.com:hooks/commit-msg ~/duhproject/.git/hooks/
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$ curl -Lo ~/duhproject/.git/hooks/commit-msg http://review.example.com/tools/hooks/commit-msg
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====
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Make sure the hook file is executable:
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====
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$ chmod u+x ~/duhproject/.git/hooks/commit-msg
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====
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SEE ALSO
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--------
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* link:user-changeid.html[Change-Id Lines]
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* link:http://www.kernel.org/pub/software/scm/git/docs/git-commit.html[git-commit(1)]
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* link:http://www.kernel.org/pub/software/scm/git/docs/githooks.html[githooks(5)]
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IMPLEMENTATION
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--------------
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The hook generates unique Change-Id lines by creating a virtual
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commit object within the local Git repository, and obtaining the
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SHA-1 hash from it. Like any other Git commit, the following
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properties are included in the computation:
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* SHA-1 of the tree being committed
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* SHA-1 of the parent commit
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* Name, email address, timestamp of the author
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* Name, email address, timestamp of the committer
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* Proposed commit message (before Change-Id was inserted)
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Because the names of the tree and parent commit, as well as the
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committer timestamp are included in the hash computation, the output
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Change-Id is sufficiently unique.
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GERRIT
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------
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Part of link:index.html[Gerrit Code Review]
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