Run builds using CircleCI 2.0 in an Alpine 3.5 container (#21)

* Support non-coreutils /bin/mktemp

The template parameter is a coreutils extension and e.g. not available in busybox
Test if we need it and use it only, if necessary

* Run builds using CircleCI 2.0 in an Alpine 3.5 container

Requires aaa7985 and
 ed9b4fd to pass tests

.circleci/config.yml

@@ -0,0 +1,20 @@
+version: 2
+jobs:
+  build:
+    working_directory: /circleci-matrix
+    docker:
+    - image: docker.io/library/alpine:3.5
+    steps:
+    - checkout
+    - run:
+        name: Install dependencies
+        command: |
+          apk add --no-cache bash ca-certificates ncurses wget
+          wget -O bats-0.4.0.tar.gz https://github.com/sstephenson/bats/archive/v0.4.0.tar.gz
+          tar -xzf bats-0.4.0.tar.gz
+          cd bats-0.4.0
+          ./install.sh /usr/local
+    - run:
+        name: Run tests
+        command: bats tests/run.bats
+

src/circleci-matrix.sh

@@ -11,6 +11,10 @@ TERMINAL_COLUMNS=$(tput cols || true)
 export CIRCLE_NODE_TOTAL=${CIRCLE_NODE_TOTAL:-1}
 export CIRCLE_NODE_INDEX=${CIRCLE_NODE_INDEX:-0}
 
+if ! rm $(mktemp -t) ; then
+	MKTEMP_T_ARG=circleci_matrix.XXX
+fi
+
 error() {
     local message=$1
     echo >&2 "ERROR: $message"
@@ -182,7 +186,7 @@ read_file() {
 process_commands() {
     local line=""
     local envfile=$1
-    local tempfile=$(mktemp -t circleci_matrix.XXX)
+    local tempfile=$(mktemp -t ${MKTEMP_T_ARG})
 
     while read -r line; do
         cp -f "$envfile" "$tempfile"
@@ -207,7 +211,7 @@ process_commands() {
 process_envs() {
     local line=""
     local i=0
-    local tempfile=$(mktemp -t circleci_matrix.XXX)
+    local tempfile=$(mktemp -t ${MKTEMP_T_ARG})
     local sources_prefix="$(sources)"
 
     while read -r line; do