lamassu-migrate-config to update ls basepath (#216)

* lamassu-migrate-config to update ls basepath

* documentation added

* constrain to a particular set of options

lib/migrate-options.js

@@ -1,9 +1,18 @@
 const _ = require('lodash/fp')
 const fs = require('fs')
 const makeDir = require('make-dir')
+const path = require('path')
 
 const load = require('./options-loader')
 
+// current path of lamassu-server project
+const currentBasePath = path.dirname(__dirname)
+// get path as array of path components
+const paths = _.wrap(_.split, path.sep)
+// find the index of the lamassu-server directory
+// /usr/lib/node_modules/lamassu-server/certs/Lamassu_OP.pem => 3
+const indexOfLs = _.flow(paths, _.wrap(_.indexOf, 'lamassu-server'))
+
 module.exports = {run, mapKeyValuesDeep}
 
 function mapKeyValuesDeep (cb, obj, key) {
@@ -26,6 +35,36 @@ async function run () {
 
   // check if there are new options to add
   let result = _.mergeAll([defaultOpts, currentOpts])
+
+  // get all the options
+  // that ends with "Path" suffix
+  console.log(`Detected lamassu-server basepath: ${currentBasePath}`)
+  _.map(optionName => {
+    const currentPath = _.get(optionName, result)
+
+    // process only keys that contains
+    // lamassu-server dir in its path
+    const i = indexOfLs(currentPath)
+    if (i === -1) {
+      return
+    }
+
+    // workout the relative path
+    // /usr/lib/node_modules/lamassu-server/certs/Lamassu_OP.pem => certs/Lamassu_OP.pem
+    const rPath = _.drop(i + 1, paths(currentPath))
+
+    // prepend the current lamassu-server path
+    // certs/Lamassu_OP.pem => /usr/local/lib/node_modules/lamassu-server/certs/Lamassu_OP.pem
+    const newPath = _.join(path.sep, _.concat([currentBasePath], rPath))
+
+    // update this option
+    // if the value has changed
+    if (!_.isEqual(currentPath, newPath)) {
+      console.log(`Migrating option ${optionName} to new path ${newPath}`)
+      result[optionName] = newPath
+    }
+  }, ['seedPath', 'caPath', 'certPath', 'keyPath', 'lamassuCaPath'])
+
   const shouldMigrate = !_.isEqual(result, currentOpts) || _.has('lamassuServerPath', result)
 
   // write the resulting lamassu.json
@@ -33,8 +72,18 @@ async function run () {
     // remove old lamassuServerPath config
     result = _.omit('lamassuServerPath', result)
 
-    const newOpts = _.pick(_.difference(_.keys(result), _.keys(currentOpts)), result)
+    // find keys for which values
-    console.log('Adding options', newOpts)
+    // have been changed
+    const differentValue = _.wrap(_.filter, key => !_.isEqual(result[key], currentOpts[key]))
+
+    // output affected options
+    const newOpts = _.pick(_.union(
+      // find change keys
+      differentValue(_.keys(result)),
+      // find new opts
+      _.difference(_.keys(result), _.keys(currentOpts))
+    ), result)
+    console.log('Updating options', newOpts)
 
     // store new lamassu.json file
     fs.writeFileSync(options.path, JSON.stringify(result, null, '  '))