yarn-homebrew #4 failed

[DanBuild]

Build 'yarn-homebrew' is failing!

Last 50 lines of build output:

[...truncated 445 B...]
 > git config remote.origin.url https://github.com/yarnpkg/yarn.git # timeout=10
Fetching upstream changes from https://github.com/yarnpkg/yarn.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/yarnpkg/yarn.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse origin/master^{commit} # timeout=10
Checking out Revision 3bd3f17bf17e943bdd62101773c99fa0973cb66c (origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 3bd3f17bf17e943bdd62101773c99fa0973cb66c
 > git rev-list bb45834217063e3480f9ce2fc85c611f1594b984 # timeout=10
[yarn-homebrew] $ /bin/sh -xe /tmp/hudson454821030900027535.sh
+ ./scripts/update-homebrew.sh
++ curl --fail https://yarnpkg.com/latest-version
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0100     6    0     6    0     0     24      0 --:--:-- --:--:-- --:--:--    24
+ version=0.23.3
+ PATH=/usr/local/bin:/usr/bin:/bin:/usr/local/games:/usr/games:/var/lib/jenkins/.linuxbrew/bin/
+ pushd /var/lib/jenkins/.linuxbrew/Library/Taps/homebrew/homebrew-core
~/.linuxbrew/Library/Taps/homebrew/homebrew-core ~/workspace/yarn-homebrew
+ git remote set-url origin https://github.com/homebrew/homebrew-core
+ git branch -D yarn-0.23.3
error: branch 'yarn-0.23.3' not found.
+ true
+ popd
~/workspace/yarn-homebrew
+ url=https://yarnpkg.com/downloads/0.23.3/yarn-v0.23.3.tar.gz
++ mktemp -t yarn-release-XXXXXXXX.tar.gz
+ tempfile=/tmp/yarn-release-m5H7kDcU.tar.gz
+ curl --fail -L -o /tmp/yarn-release-m5H7kDcU.tar.gz https://yarnpkg.com/downloads/0.23.3/yarn-v0.23.3.tar.gz
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0100    92  100    92    0     0    373      0 --:--:-- --:--:-- --:--:--   373
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0100   595    0   595    0     0    965      0 --:--:-- --:--:-- --:--:--  2065
  4 3861k    4  168k    0     0   129k      0  0:00:29  0:00:01  0:00:28  129k100 3861k  100 3861k    0     0  2046k      0  0:00:01  0:00:01 --:--:-- 6313k
++ head -c 64
++ sha256sum /tmp/yarn-release-m5H7kDcU.tar.gz
+ hash=9f7569b9b89bbe4c3c0bbd8917f551ec26935802668b6e6139ea45db67e3a314
+ BROWSER=/bin/true
+ brew bump-formula-pr --strict yarn --url=https://yarnpkg.com/downloads/0.23.3/yarn-v0.23.3.tar.gz --sha256=9f7569b9b89bbe4c3c0bbd8917f551ec26935802668b6e6139ea45db67e3a314 '--message=This PR was automatically created via a script. Contact @Daniel15 with any questions.'
Updated Homebrew from 59c9ddbc1 to dc9752ea5.
No changes to formulae.
==> replace "https://yarnpkg.com/downloads/0.23.0/yarn-v0.23.0.tar.gz" with "https://yarnpkg.com/downloads/0.23.3/yarn-v0.23.3.tar.gz"
==> replace "8cbd733e6bf253e0f5e2e5db7dbd165311150754b33df7c00bcaec175a3b33c2" with "9f7569b9b89bbe4c3c0bbd8917f551ec26935802668b6e6139ea45db67e3a314"
error: Your local changes to the following files would be overwritten by checkout:
	Formula/yarn.rb
Please commit your changes or stash them before you switch branches.
Aborting
Error: Failure while executing: git checkout --no-track -b yarn-0.23.3 origin/master
Build step 'Execute shell' marked build as failure

View full output

cc @Daniel15

[Daniel15]

error: Your local changes to the following files would be overwritten by checkout:

I think I need to update the script to clean the repo before performing the change