add travis ci testing

* and lint tests with shellcheck

.travis.yml

@@ -0,0 +1,28 @@
+language: bash
+
+addons:
+  apt:
+    sources:
+      - debian-sid
+    packages:
+      - shellcheck
+
+cache:
+  directories:
+    - /home/travis/.stack
+
+before_install:
+
+install:
+    - test -f tests/lint.sh
+    - test -f tests/run.sh
+
+before_script:
+
+script:
+   - tests/lint.sh
+   - cd tests && ./run.sh
+
+after_script:
+
+sudo: false

tests/lint.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+export DIRS_WITH_SCRIPTS="periodic sbin share/zfsnap share/zfsnap/commands tools"
+
+pwd
+
+for _dir in $DIRS_WITH_SCRIPTS
+do
+    for _f in $_dir/*.sh
+    do
+        sh -n "$_f"
+        echo "shellcheck $_f"
+        shellcheck -e SC2009,SC2086,SC2153,SC2016,SC1004,SC2119 "$_f"
+    done
+done