building release tag

[Hochhaus, Andy]

I am having difficulties building webrtc at a specific release tag. The webrtc instructions describe building a release branch, but not a release tag. Using the chrome release branch documentation as a guide, I am running:

$ mkdir webrtc_build

$ cd webrtc_build/

$ git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git

$ export PATH=/home/ahochhaus/webrtc_build/depot_tools/:$PATH

$ export GYP_DEFINES="OS=android"

$ fetch --nohooks webrtc_android

$ cd src

$ # If I wanted to build the release branch, the following commands work:

$ # git branch -r  # To see available release branches

$ # git checkout -b branch_56 refs/remotes/branch-heads/56

$ # However, trying to build a release tag, I run:

$ git fetch --tags

$ git show-ref --tags  # To see available release tags

(no output -- I think this should show the release tags)

$ git checkout -b branch_56_0_2924_87 tags/56.0.2924.87

fatal: Cannot update paths and switch to branch 'branch_56_0_2924_87' at the same time.

Did you intend to checkout 'tags/56.0.2924.87' which can not be resolved as commit?

Is it possible to easily build webrtc at an exact chrome release tag? What do I need to change to fetch the webrtc release tags?

Best,

Andy

[Henrik Kjellander]

We don't maintain tags yet for WebRTC, only branches.

Generally, the WebRTC branches are following the Chrome branches (Chrome M56 uses https://chromium.googlesource.com/external/webrtc/+/branch-heads/56 but in order to see exactly which you probably have to compare build date unfortunately).

To figure out exactly which WebRTC revision is used in a Chrome daily build, you can use https://omahaproxy.appspot.com/ to lookup the hash, then you'll just compare that revision of the Chromium DEPS file (https://chromium.googlesource.com/chromium/src/+/master/DEPS) and check the revision of src/third_party/webrtc.

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