Use payload.env instead of forwarding variables manually

.taskcluster.yml

@@ -49,7 +49,14 @@ tasks:
             taskclusterProxy: true
 
           env:
-            TC_DECISION_SHA: ef67832e6657f43e139a10f37eb326a7d9d96dad
+            TASK_ID: ${metadata.task_id}
+            GITHUB_HEAD_USER_LOGIN: ${metadata.github.login}
+            GITHUB_HEAD_USER_EMAIL: ${metadata.github.login}@users.noreply.github.com
+            GITHUB_EVENT: ${metadata.github.action}
+            GITHUB_HEAD_REPO_URL: ${metadata.github.clone_url}
+            GITHUB_HEAD_BRANCH: ${metadata.github.ref}
+            GITHUB_HEAD_REF: ${metadata.github.ref}
+            GITHUB_HEAD_SHA: ${metadata.github.sha}
 
           command:
             - "/bin/bash"
@@ -62,15 +69,7 @@ tasks:
               cd /home/build-user/ &&
               echo -e "#!/bin/bash\nset -xe\nenv && id && mkdir ~/DeepSpeech/ && git clone --quiet ${metadata.github.clone_url} ~/DeepSpeech/ds/ && cd ~/DeepSpeech/ds && git checkout --quiet ${metadata.github.ref}" > /tmp/clone.sh && chmod +x /tmp/clone.sh &&
               sudo -H -u build-user /bin/bash /tmp/clone.sh &&
-              sudo -H -u build-user --preserve-env /bin/bash /home/build-user/DeepSpeech/ds/taskcluster/tc-schedule.sh \
-                TASK_ID=${metadata.task_id} \
-                GITHUB_HEAD_USER_LOGIN=${metadata.github.login} \
-                GITHUB_HEAD_USER_EMAIL=${metadata.github.login}@users.noreply.github.com \
-                GITHUB_EVENT=${metadata.github.action} \
-                GITHUB_HEAD_REPO_URL=${metadata.github.clone_url} \
-                GITHUB_HEAD_BRANCH=${metadata.github.ref} \
-                GITHUB_HEAD_REF=${metadata.github.ref} \
-                GITHUB_HEAD_SHA=${metadata.github.sha}
+              sudo -H -u build-user --preserve-env /bin/bash /home/build-user/DeepSpeech/ds/taskcluster/tc-schedule.sh
           artifacts:
             "public":
               type: "directory"

taskcluster/tc-schedule.sh

@@ -1,11 +1,6 @@
 #!/bin/bash
 set -ex
 
-# Set environment variables passed in arguments
-for line in $@; do
-  eval "$line"
-done
-
 curdir=$(dirname "$0")/
 
 pip3 install --quiet --user --upgrade pip
@@ -40,19 +35,9 @@ GITHUB_HEAD_USER_EMAIL="email" \
 python3 ${curdir}/tc-decision.py --dry
 
 # Create a new env variable for usage in TaskCluster .yml files
-GITHUB_HEAD_BRANCHORTAG="${GITHUB_HEAD_BRANCH}${GITHUB_HEAD_TAG}"
+export GITHUB_HEAD_BRANCHORTAG="${GITHUB_HEAD_BRANCH}${GITHUB_HEAD_TAG}"
 
 # Quick hack because tc-decision uses GITHUB_HEAD_BRANCH
-GITHUB_HEAD_BRANCH="${GITHUB_HEAD_BRANCH}${GITHUB_HEAD_TAG}"
+export GITHUB_HEAD_BRANCH="${GITHUB_HEAD_BRANCH}${GITHUB_HEAD_TAG}"
 
-# Forward all variables to tc-decision.py
-GITHUB_EVENT="$GITHUB_EVENT" \
-TASK_ID="$TASK_ID" \
-GITHUB_HEAD_BRANCHORTAG="${GITHUB_HEAD_BRANCHORTAAG}" \
-GITHUB_HEAD_BRANCH="${GITHUB_HEAD_BRANCH}" \
-GITHUB_HEAD_REF="$GITHUB_HEAD_REF" \
-GITHUB_HEAD_SHA="$GITHUB_HEAD_SHA" \
-GITHUB_HEAD_REPO_URL="$GITHUB_HEAD_REPO_URL" \
-GITHUB_HEAD_USER_LOGIN="$GITHUB_HEAD_USER_LOGIN" \
-GITHUB_HEAD_USER_EMAIL="$GITHUB_HEAD_USER_EMAIL" \
 python3 ${curdir}/tc-decision.py