nims script for connecting to testnets published in the eth2-testnets repo

See https://github.com/ethereum/eth2.0-pm/pull/93 for more info

scripts/connect_to_testnet.nims

@@ -0,0 +1,71 @@
+import
+  confutils, strutils, strformat, ospaths
+
+const
+  rootDir = thisDir() / ".."
+  bootstrapFile = "bootstrap_nodes.txt"
+  depositContractFile = "deposit_contract.txt"
+  genesisFile = "genesis.ssz"
+  configFile = "config.yaml"
+  clientsOrg = "zah" # "eth2-clients"
+  testnetsRepo = "eth2-testnets"
+  testnetsRepoGitUrl = "git://github.com/" & clientsOrg & "/" & testnetsRepo
+
+proc validateTestnetName(parts: openarray[string]): auto =
+  if parts.len != 2:
+    echo "The testnet name should have the format `client/network-name`"
+    quit 1
+  (parts[0], parts[1])
+
+cli do (testnetName {.argument.}: string):
+  let
+    nameParts = testnetName.split "/"
+    (team, testnet) = if nameParts.len > 1: validateTestnetName nameParts
+                      else: ("nimbus", testnetName)
+
+  let
+    buildDir = rootDir / "build"
+    allTestnetsDir = buildDir / testnetsRepo
+
+  if not dirExists(allTestnetsDir):
+    cd buildDir
+    exec &"git clone {testnetsRepoGitUrl}"
+
+  cd allTestnetsDir
+  exec &"git remote set-url origin {testnetsRepoGitUrl}"
+  exec "git reset --hard master"
+  exec "git pull"
+
+  let testnetDir = allTestnetsDir / team / testnet
+  if not dirExists(testnetDir):
+    echo &"No metadata files exists for the '{testnetName}' testnet"
+    quit 1
+
+  proc checkRequiredFile(fileName: string) =
+    let filePath = testnetDir / fileName
+    if not fileExists(filePath):
+      echo &"The required file {fileName} is not present in '{testnetDir}'."
+      quit 1
+
+  checkRequiredFile bootstrapFile
+  checkRequiredFile depositContractFile
+  checkRequiredFile genesisFile
+
+  var preset = testnetDir / configFile
+  if not fileExists(preset): preset = "minimal"
+
+  let
+    depositContract = readFile(testnetDir / depositContractFile).strip
+    dataDirName = testnetName.replace("/", "_")
+    dataDir = buildDir / "data" / dataDirName
+    beaconNodeBinary = buildDir / "beacon_node_" & dataDirName
+    nimFlags = "-d:release --lineTrace:on -d:chronicles_log_level=DEBUG"
+
+  cd rootDir
+  exec &"""nim c {nimFlags} -d:"const_preset={preset}" -o:"{beaconNodeBinary}" beacon_chain/beacon_node.nim"""
+  exec replace(&"""{beaconNodeBinary}
+    --data-dir="{dataDir}"
+    --bootstrap-file="{testnetDir/bootstrapFile}"
+    --state-snapshot="{testnetDir/genesisFile}"
+    --deposit-contract={depositContract}""", "\n", " ")
+

vendor/nim-confutils

@@ -1 +1 @@
-Subproject commit 36645f1322c64deba03432d34dd75a9dafbd95ed
+Subproject commit 533a621d4a596eb3bccb27572234dbe4d2eebfac