[llvm-dev] Getting the commit message from Phabricator

[MyDeveloper Day via llvm-dev]

I'm not sure if this is well known, but it helped me so I thought I'd share
it with you.

When committing to gitmonorepo, (with git llvm push) you need to have
committed to your local repo first and so you need to have crafted your
commit message from your the Phabricator revision. (e.g. D12345)

Phabricator has the ability to give you this commit message it would have
used, even if you do not use arc to perform the commit/land

This small script (attached) uses arc, jq and sed  (but it can be
relatively easily changed to use curl instead of arc)

You need to provide your own conduit api token in place of
<replace_with_phabricator_api_token>

You can get one of these from you Profile->Setting->Conduit API Tokens in
the top right hand corner of Phabricator https://reviews.llvm.org

----------------------------
get_commit_message.sh
----------------------------
echo '{ "revision_id": '${1:1}' }' | arc call-conduit --conduit-uri
https://reviews.llvm.org/ --conduit-token
<replace_with_phabricator_api_token> differential.getcommitmessage | jq
".response" | sed 's/^.\(.*\).$/\1/' - | sed 's/\\n/\
/g' -
----------------------------

This simply pulls the commit message as json and then replaces \n with
newlines (there are probably better ways of doing this, I'm not a jq
expert!)

Given an example review https://reviews.llvm.org/D58250

simply run

get_commit_message.sh D58250

And you get all the relevant information (see below) about the
message,revision,reviewers, subsribers etc.. returned  (as if arc was going
to commit it)

(names changed to protect the innocent)
---------------------------------------------------------------------------------
[AIX][CMake] Changes for building on AIX with XL and GCC

Summary: In support of IBM's efforts to produce a viable C and C++ LLVM
compiler for AIX (ref: RFC at
http://lists.llvm.org/pipermail/llvm-dev/2019-February/130175.html), this
patch adds customizations to the CMake files in order to properly invoke
the host toolchain for the build on AIX. Additional changes to enable a
successful build will follow.

Reviewers: john doe

Reviewed By: jane doe,walter smith

Subscribers: jane doe, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58250
---------------------------------------------------------------------------------

You can then copy and paste this into your commit message.

I hope this helps..

MyDeveloperDay
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