travis: trigger build of trezor-core when python-trezor is pushed

.travis.yml

@@ -36,6 +36,9 @@ install:
     - export PATH="$(pwd)/protoc/bin:$PATH"
     - pip install "protobuf == ${PROTOBUF_VERSION}"
 
+before_script:
+    - ./trigger-travis.sh
+
 script:
     # check that generated protobuf messages are identical to in-tree ones
     - ./tools/build_protobuf messages.tmp && diff -ur messages.tmp trezorlib/messages && rm -r messages.tmp

trigger-travis.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+# adapted from https://github.com/stephanmg/travis-dependent-builds
+
+# variables
+USER=trezor
+REPO=trezor-core
+BRANCH=master
+SOURCE=trezor/python-trezor
+
+if [ "$TRAVIS_REPO_SLUG" != "$SOURCE" ]; then
+    echo "not triggering from $TRAVIS_REPO_SLUG"
+    exit 0;
+fi
+
+if [ "$TRAVIS_PULL_REQUEST" != "false"]; then
+    echo "not triggering from pull requests"
+    exit 0;
+fi
+
+if [[ "$TRAVIS_JOB_NUMBER" != *.1 ]]; then
+    echo "not triggering for job number $TRAVIS_JOB_NUMBER (not first job in set)"
+    exit 0;
+fi
+
+MESSAGE=",\"message\": \"Triggered from upstream build of $TRAVIS_REPO_SLUG by commit "`git rev-parse --short HEAD`"\""
+
+# curl POST request content body
+BODY="{
+  \"request\": {
+  \"branch\":\"$BRANCH\"
+  $MESSAGE
+}}"
+
+echo "attempting to trigger build of $USER/$REPO"
+# make a POST request with curl (note %2F could be replaced with
+# / and additional curl arguments, however this works too!)
+curl -s -X POST \
+  -H "Content-Type: application/json" \
+  -H "Accept: application/json" \
+  -H "Travis-API-Version: 3" \
+  -H "Authorization: token ${TRAVIS_TOKEN}" \
+  -d "$BODY" \
+  https://api.travis-ci.org/repo/${USER}%2F${REPO}/requests \
+  | tee /tmp/travis-request-output.$$.txt
+
+if grep -q '"@type": "error"' /tmp/travis-request-output.$$.txt; then
+   cat /tmp/travis-request-output.$$.txt
+   exit 1
+elif grep -q 'access denied' /tmp/travis-request-output.$$.txt; then
+   cat /tmp/travis-request-output.$$.txt
+   exit 1
+fi