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Substitutes environment variables in Handlebars templates, useful for configuration files in Docker

JavaScript 85.96% Dockerfile 12.29% Shell 1.75%
docker config-template mustache-templates handlebars

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envhandlebars's Issues

Error when running in container clusters

When an application uses this library to handle environment variables and is ran in a container cluster (like Marathon or Kubernetes), where envvars set by such software could be PORT=<container_port> and PORT_<lb_port>=<container_port>, for the example variables of PORT=2345 and PORT_1234=2345 a following backtrace is thrown and the application errors out.

/usr/local/lib/node_modules/envhandlebars/index.js:74
                vars[match[1]][match[2]] = opts.env[key];
                                         ^
TypeError: Cannot create property '1234' on string '2345'
    at parseVar (/usr/local/lib/node_modules/envhandlebars/index.js:74:42)
    at /usr/local/lib/node_modules/envhandlebars/index.js:52:13
    at Array.forEach (<anonymous>)
    at getVars (/usr/local/lib/node_modules/envhandlebars/index.js:51:31)
    at applyTemplate (/usr/local/lib/node_modules/envhandlebars/index.js:40:35)
    at ConcatStream.<anonymous> (/usr/local/lib/node_modules/envhandlebars/node_modules/concat-stream/index.js:36:43)
    at ConcatStream.emit (events.js:164:20)
    at finishMaybe (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:607:14)
    at endWritable (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:615:3)
    at ConcatStream.Writable.end (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:571:41)
Converting: /opt/admin/env/cfg.json.tpl
/usr/local/lib/node_modules/envhandlebars/index.js:74
                vars[match[1]][match[2]] = opts.env[key];
                                         ^
TypeError: Cannot create property '1234' on string '2345'
    at parseVar (/usr/local/lib/node_modules/envhandlebars/index.js:74:42)
    at /usr/local/lib/node_modules/envhandlebars/index.js:52:13
    at Array.forEach (<anonymous>)
    at getVars (/usr/local/lib/node_modules/envhandlebars/index.js:51:31)
    at applyTemplate (/usr/local/lib/node_modules/envhandlebars/index.js:40:35)
    at ConcatStream.<anonymous> (/usr/local/lib/node_modules/envhandlebars/node_modules/concat-stream/index.js:36:43)
    at ConcatStream.emit (events.js:164:20)
    at finishMaybe (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:607:14)
    at endWritable (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:615:3)
    at ConcatStream.Writable.end (/usr/local/lib/node_modules/envhandlebars/node_modules/readable-stream/lib/_stream_writable.js:571:41)

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