From 10b635185d7b110f6f471290ad4389e3d2881bf0 Mon Sep 17 00:00:00 2001
From: Josh Harvey <josh@lamassu.is>
Date: Wed, 12 Jul 2017 15:34:00 +0300
Subject: [PATCH] support installing with existing volumes and droplets

---
 lib/blockchain/bitcoin.js  |  3 +--
 lib/blockchain/common.js   | 19 ++++++++++++++++---
 lib/blockchain/dash.js     |  3 +--
 lib/blockchain/install.js  |  4 +++-
 lib/blockchain/litecoin.js |  3 +--
 lib/blockchain/zcash.js    |  3 +--
 6 files changed, 23 insertions(+), 12 deletions(-)

diff --git a/lib/blockchain/bitcoin.js b/lib/blockchain/bitcoin.js
index 2b6e9309..cfad370b 100644
--- a/lib/blockchain/bitcoin.js
+++ b/lib/blockchain/bitcoin.js
@@ -1,4 +1,3 @@
-const fs = require('fs')
 const path = require('path')
 
 const coinUtils = require('../coin-utils')
@@ -12,7 +11,7 @@ const coinRec = coinUtils.getCryptoCurrency('BTC')
 function setup (dataDir) {
   common.firewall([coinRec.defaultPort])
   const config = buildConfig()
-  fs.writeFileSync(path.resolve(dataDir, coinRec.configFile), config)
+  common.writeFile(path.resolve(dataDir, coinRec.configFile), config)
   const cmd = `/usr/local/bin/${coinRec.daemon} -datadir=${dataDir}`
   common.writeSupervisorConfig(coinRec, cmd)
 }
diff --git a/lib/blockchain/common.js b/lib/blockchain/common.js
index cfd8acfb..60972928 100644
--- a/lib/blockchain/common.js
+++ b/lib/blockchain/common.js
@@ -12,7 +12,8 @@ module.exports = {
   randomPass,
   fetchAndInstall,
   logger,
-  isInstalledSoftware
+  isInstalledSoftware,
+  writeFile
 }
 
 const BINARIES = {
@@ -70,7 +71,7 @@ stdout_logfile=/var/log/supervisor/${blockchain}.out.log
 environment=HOME="/root"
 `
 
-  fs.writeFileSync(`/etc/supervisor/conf.d/${coinRec.code}.conf`, supervisorConfig)
+  writeFile(`/etc/supervisor/conf.d/${coinRec.code}.conf`, supervisorConfig)
 }
 
 function isInstalledSoftware (coinRec) {
@@ -80,7 +81,7 @@ function isInstalledSoftware (coinRec) {
 function fetchAndInstall (coinRec) {
   if (isInstalledSoftware(coinRec)) return
 
-  const binaries = BINARIES[coinRec.coinRecCode]
+  const binaries = BINARIES[coinRec.cryptoCode]
   if (!binaries) throw new Error(`No such coin: ${coinRec.code}`)
 
   const url = binaries.url
@@ -91,3 +92,15 @@ function fetchAndInstall (coinRec) {
   es(`tar -xzf ${downloadFile}`)
   es(`sudo cp ${binDir}/* /usr/local/bin`)
 }
+
+function writeFile (path, content) {
+  try {
+    fs.writeFileSync(path, content)
+  } catch (err) {
+    if (err.code === 'EEXIST') {
+      logger.info(`${path} exists, skipping.`)
+    }
+
+    throw err
+  }
+}
diff --git a/lib/blockchain/dash.js b/lib/blockchain/dash.js
index ab50bec8..0093540c 100644
--- a/lib/blockchain/dash.js
+++ b/lib/blockchain/dash.js
@@ -1,4 +1,3 @@
-const fs = require('fs')
 const path = require('path')
 
 const coinUtils = require('../coin-utils')
@@ -12,7 +11,7 @@ const coinRec = coinUtils.getCryptoCurrency('DASH')
 function setup (dataDir) {
   common.firewall([coinRec.defaultPort])
   const config = buildConfig()
-  fs.writeFileSync(path.resolve(dataDir, coinRec.configFile), config)
+  common.writeFile(path.resolve(dataDir, coinRec.configFile), config)
   const cmd = `/usr/local/bin/${coinRec.daemon} -datadir=${dataDir}`
   common.writeSupervisorConfig(coinRec, cmd)
 }
diff --git a/lib/blockchain/install.js b/lib/blockchain/install.js
index f824e0c6..106e2ffd 100644
--- a/lib/blockchain/install.js
+++ b/lib/blockchain/install.js
@@ -70,8 +70,10 @@ function setupCrypto (crypto) {
   process.chdir(tmpDir)
   common.es('rm -rf *')
   common.fetchAndInstall(crypto)
+
   cryptoPlugin.setup(cryptoDir)
-  fs.writeFileSync(installedVolumeFilePath(crypto), '')
+
+  common.writeFile(installedVolumeFilePath(crypto), '')
   process.chdir(oldDir)
 }
 
diff --git a/lib/blockchain/litecoin.js b/lib/blockchain/litecoin.js
index cf87c51c..2e1d4ea2 100644
--- a/lib/blockchain/litecoin.js
+++ b/lib/blockchain/litecoin.js
@@ -1,4 +1,3 @@
-const fs = require('fs')
 const path = require('path')
 
 const coinUtils = require('../coin-utils')
@@ -12,7 +11,7 @@ const coinRec = coinUtils.getCryptoCurrency('LTC')
 function setup (dataDir) {
   common.firewall([coinRec.defaultPort])
   const config = buildConfig()
-  fs.writeFileSync(path.resolve(dataDir, coinRec.configFile), config)
+  common.writeFile(path.resolve(dataDir, coinRec.configFile), config)
   const cmd = `/usr/local/bin/${coinRec.daemon} -datadir=${dataDir}`
   common.writeSupervisorConfig(coinRec, cmd)
 }
diff --git a/lib/blockchain/zcash.js b/lib/blockchain/zcash.js
index 3df6b067..1497f443 100644
--- a/lib/blockchain/zcash.js
+++ b/lib/blockchain/zcash.js
@@ -1,4 +1,3 @@
-const fs = require('fs')
 const path = require('path')
 
 const coinUtils = require('../coin-utils')
@@ -20,7 +19,7 @@ function setup (dataDir) {
   es('zcash-fetch-params 2>&1')
   logger.info('Finished fetching proofs.')
   const config = buildConfig()
-  fs.writeFileSync(path.resolve(dataDir, 'zcash.conf'), config)
+  common.writeFile(path.resolve(dataDir, coinRec.configFile), config)
   const cmd = `/usr/local/bin/${coinRec.daemon} -datadir=${dataDir}`
   common.writeSupervisorConfig(coinRec, cmd)
 }