Run the tests on a CI (#215)

* Add CircleCI and make tests pass on ubuntu:16.04
* Add badge to readme
* Add debian stable to CircleCI
* Fix pkill on CircleCI debian

.circleci/config.yml

@@ -0,0 +1,56 @@
+version: 2
+
+workflows:
+  version: 2
+  ci:
+    jobs:
+      - debian
+      - ubuntu
+
+jobs:
+
+  debian:
+    docker:
+      - image: debian:9.1
+    steps:
+      - checkout
+      - run:
+          name: 'Installing'
+          command: |
+            apt-get update -y
+            apt-get install -y build-essential expect git gnupg2 pinentry-tty procps rpm ruby-dev
+            gem install fpm
+      - run:
+          name: 'Cleaning'
+          command: |
+            rm -rf ~/.gpnupg
+            make clean
+      - run:
+          name: 'Testing'
+          command: |
+            GPG=gpg2 make test
+            make packages-deb
+            make packages-rpm
+
+  ubuntu:
+    docker:
+      - image: ubuntu:16.04
+    steps:
+      - checkout
+      - run:
+          name: 'Installing'
+          command: |
+            apt-get update -y
+            apt-get install -y build-essential expect git gnupg2 pinentry-tty procps rpm ruby-dev
+            gem install fpm
+      - run:
+          name: 'Cleaning'
+          command: |
+            rm -rf ~/.gpnupg
+            make clean
+      - run:
+          name: 'Testing'
+          command: |
+            GPG=gpg2 make test
+            make packages-deb
+            make packages-rpm

README.md

@@ -1,4 +1,4 @@
-BlackBox
+BlackBox ![CircleCI](https://circleci.com/gh/StackExchange/blackbox.svg?style=shield)
 ========
 
 Safely store secrets in a VCS repo (i.e. Git, Mercurial, Subversion or Perforce). These commands make it easy for you to Gnu Privacy Guard (GPG) encrypt specific files in a repo so they are "encrypted at rest" in your repository. However, the scripts make it easy to decrypt them when you need to view or edit them, and decrypt them for use in production. Originally written for Puppet, BlackBox now works with any Git or Mercurial repository.

tools/confidence_test.sh

@@ -225,7 +225,7 @@ become_bob
 # This users's default group:
 DEFAULT_GID_NUM=$(id -g)
 # Pick a group that is not the default group:
-TEST_GID_NUM=$(id -G | fmt -1 | sort -rn | grep -xv "$(id -u)" | grep -xv "$(id -g)" | head -1)
+TEST_GID_NUM=$(grep -v "$DEFAULT_GID_NUM" /etc/group | cut -d: -f3 | sort -rn | head -1)
 echo "DEFAULT_GID_NUM=$DEFAULT_GID_NUM"
 echo "TEST_GID_NUM=$TEST_GID_NUM"