A script to format environment variables into a Bintray descriptor file to use for Travis deployments.

bintray.json

{
  "package": {
    "name": "$(echo $TRAVIS_REPO_SLUG | cut -d '/' -f 2)",
    "repo": "builds",
    "subject": "18jafenn90",
    "vcs_url": "https://github.com/$TRAVIS_REPO_SLUG",
    "issue_tracker_url": "https://github.com/$TRAVIS_REPO_SLUG/issues",
    "licenses": ["Apache-2.0"]
  },

  "version": {
    "name": "$TRAVIS_COMMIT",
    "desc": "$TRAVIS_COMMIT_MESSAGE"
  },

  "files": [
    {
      "includePattern": "app/build/outputs/apk/(.*)/(.*\\.apk)",
      "uploadPattern": "/$TRAVIS_COMMIT/\$2",
      "matrixParams": {
        "override": 1
      }
    }
  ],
  "publish": true
}

gen-bintray-descriptor.sh

#!/bin/bash

# MIT License
# 
# Copyright (c) 2019 James Fenn
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

# All that this script really does is replace all "$SOMETHING" strings in 'bintray.json'
# with the respective environment variables, and write the result to itself. It looks weird,
# but it works. Trust me.
#
# Variables that you do not want to be replaced (ex: $2 in the `uploadPattern` in the json
# file above) can be escaped with a backslash ("\$2" will become just "$2" in the output).
# Escaped characters will need to be double-escaped as well ("\\.apk" will become "\.apk").
#
# See https://unix.stackexchange.com/questions/294835/replace-environment-variables-in-a-file-with-their-actual-values
# for more ways to do this. I am only using this method because it A: works, and B: has the
# smallest amount of dependencies.

eval "cat << EOF
$(<bintray.json)
EOF
" > bintray.json