update ci setup (#67)

motivation: 5.2 adoption, prepare for 5.3

changes:
* add 5.2 docker-compose setup
* add 5.3 docker-compose setup (placeholder)
* remove 4.2 docker-compose setup
* format

.swiftformat

@@ -1,5 +1,6 @@
 # file options
 
+--swiftversion 5.0
 --exclude .build
 
 # format options
@@ -7,7 +8,6 @@
 --self insert
 --patternlet inline
 --stripunusedargs unnamed-only
---comments ignore
 --ifdef no-indent
 
 # rules

Sources/CoreMetrics/Locks.swift

@@ -38,7 +38,7 @@ import Glibc
 /// of lock is safe to use with `libpthread`-based threading models, such as the
 /// one used by NIO.
 internal final class Lock {
-    fileprivate let mutex: UnsafeMutablePointer<pthread_mutex_t> = UnsafeMutablePointer.allocate(capacity: 1)
+    private let mutex: UnsafeMutablePointer<pthread_mutex_t> = UnsafeMutablePointer.allocate(capacity: 1)
 
     /// Create a new lock.
     public init() {
@@ -102,7 +102,7 @@ extension Lock {
 /// of lock is safe to use with `libpthread`-based threading models, such as the
 /// one used by NIO.
 internal final class ReadWriteLock {
-    fileprivate let rwlock: UnsafeMutablePointer<pthread_rwlock_t> = UnsafeMutablePointer.allocate(capacity: 1)
+    private let rwlock: UnsafeMutablePointer<pthread_rwlock_t> = UnsafeMutablePointer.allocate(capacity: 1)
 
     /// Create a new lock.
     public init() {

docker/Dockerfile

@@ -1,8 +1,7 @@
 ARG swift_version=5.0
 ARG ubuntu_version=bionic
-# backwards compatibility for 4.2 images
-ARG image_version=$swift_version-$ubuntu_version
-FROM swift:$image_version
+ARG base_image=swift:$swift_version-$ubuntu_version
+FROM $base_image
 # needed to do again after FROM due to docker limitation
 ARG swift_version
 ARG ubuntu_version
@@ -31,7 +30,7 @@ RUN chmod 755 $HOME/.tools/symbolicate-linux-fatal
 
 # swiftformat (until part of the toolchain)
 
-ARG swiftformat_version=0.40.12
+ARG swiftformat_version=0.44.6
 RUN git clone --branch $swiftformat_version --depth 1 https://github.com/nicklockwood/SwiftFormat $HOME/.tools/swift-format
 RUN cd $HOME/.tools/swift-format && swift build -c release
 RUN ln -s $HOME/.tools/swift-format/.build/release/swiftformat $HOME/.tools/swiftformat

docker/docker-compose.1804.42.yaml

@@ -1,15 +0,0 @@
-version: "3"
-
-services:
-
-  runtime-setup:
-    image: swift-metrics:18.04-4.2
-    build:
-      args:
-        image_version: "4.2"
-
-  test:
-    image: swift-metrics:18.04-4.2
-
-  shell:
-    image: swift-metrics:18.04-4.2

docker/docker-compose.1804.52.yaml

@@ -0,0 +1,18 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-metrics:18.04-5.2
+    build:
+      args:
+        ubuntu_version: "bionic"
+        swift_version: "5.2"
+
+  test:
+    image: swift-metrics:18.04-5.2
+    environment: []
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: swift-metrics:18.04-5.2

docker/docker-compose.1804.53.yaml

@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+
+  runtime-setup:
+    image: swift-metrics:18.04-5.3
+    build:
+      args:
+        base_image: "swiftlang/swift:nightly-master-bionic"
+
+  test:
+    image: swift-metrics:18.04-5.3
+    environment: []
+      #- SANITIZER_ARG=--sanitize=thread
+
+  shell:
+    image: swift-metrics:18.04-5.3