Merge pull request #41 from CircleCI-Public/updater

Add a script to automate the download and install.

.circleci/config.yml

@@ -73,11 +73,23 @@ jobs:
       - save_cache:
           key: v2-goreleaser-{{ checksum "~/goreleaser_amd64.deb" }}
           paths: [~/goreleaser_amd64.deb]
+  shellcheck:
+    docker:
+      - image: nlknguyen/alpine-shellcheck:v0.4.6
+    steps:
+      - checkout
+      - run:
+          name: Check Scripts
+          command: |
+            find . -type f -name '*.sh' -not -path './vendor/*' > /tmp/files.txt
+            echo "Checking $(cat /tmp/files.txt | wc -l ) files"
+            cat /tmp/files.txt | xargs -t shellcheck --external-sources
 
 workflows:
   version: 2
   ci:
     jobs:
+      - shellcheck
       - test
       - coverage
       - lint
@@ -86,6 +98,7 @@ workflows:
             - test
             - coverage
             - lint
+            - shellcheck
           filters:
             branches:
               only: master

install.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+set -o errexit
+set -o nounset
+set -o pipefail
+
+RELEASE_URL="https://api.github.com/repos/CircleCI-Public/circleci-cli/releases/latest"
+DEST="/usr/local/bin/circleci"
+
+# Run the script in a temporary directory that we know is empty.
+SCRATCH=$(mktemp -d)
+cd "$SCRATCH"
+
+function finish {
+  # Delete the working directory when the install was successful.
+  rm -r "$SCRATCH"
+}
+
+function error {
+  echo "An error occured installing the tool."
+  echo "The contents of the directory $SCRATCH have been left in place to help to debug the issue."
+}
+
+trap finish EXIT
+trap error ERR
+
+echo "Finding latest release."
+curl --retry 3 --fail --location --silent --output release.json "$RELEASE_URL" 
+
+STRIP_JSON_STRING='s/.*"([^"]+)".*/\1/'
+
+echo -n 'Downloading CircleCI '
+grep tag_name release.json | sed -E "$STRIP_JSON_STRING"
+
+grep browser_download_url release.json | sed -E "$STRIP_JSON_STRING" > tarball_urls.txt
+grep -i "$(uname)" tarball_urls.txt | xargs curl --retry 3 --fail --location --output circleci.tgz
+
+tar zxvf circleci.tgz --strip 1
+
+echo "Installing to $DEST"
+mv circleci $DEST
+chmod +x $DEST
+command -v circleci