cli: add command git-backport

[edvbld]

Hi all,

please review this patch that adds the new CLI command git backport. A contributing backporting a commit can now simply run git backport --from=jdk <HASH> to backport a commit from the JDK repo targeting the current repository. The "other" direction is also possible, where the user runs the command in a local clone of their personal fork of the jdk repository: git backport --to=jdk16u <HASH>. The user can optionally supply a branch, as in git backport --to=jfx --branch=jfx14 <HASH>.

Behind the scenes the git backport do nothing more than just making a "backport" commit comment on the given hash.

Testing:

• Manual testing on Linux x64

Thanks,
Erik

---

Progress

• Change must not contain extraneous whitespace
• Change must be properly reviewed

Testing

	Linux x64	Windows x64	macOS x64
Build / test	✔️ (1/1 passed)	✔️ (1/1 passed)	✔️ (1/1 passed)

Reviewers

• Robin Westberg (@rwestberg - Reviewer)

Download

$ git fetch https://git.openjdk.java.net/skara pull/948/head:pull/948
$ git checkout pull/948

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[mlbridge]

Webrevs

• 00: Full (b236fa7)

[rwestberg]

Looks good!

[openjdk]

@edvbld This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

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After integration, the commit message for the final commit will be:

cli: add command git-backport

Reviewed-by: rwestberg

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[edvbld]

/integrate

[openjdk]

@edvbld Since your change was applied there has been 1 commit pushed to the master branch:

• 4afd995: Restrict merge PR commit titles if required by the jcheck configuration

Your commit was automatically rebased without conflicts.

Pushed as commit 4f35b6f.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

[mrserb]

For some reason, I do not see backport command in the Skara help even on the freshly recloned version of skara, what could go wrong?