Merge pull request #473 from btlogy/462.ci-http-checkout

CI checkout SHA1 digests and work for both local and remote forks

.circleci/config.yml

@@ -21,17 +21,28 @@ orbs:
 aliases:
   # Custom checkout step using https URL instead of the ssh one provided by GitHub OAuth
   # This avoids us having to manage keys only to read a public repo - until we have to push?
+  # But we have to handle remote branches from external fork (CIRCLE_PR_XXX)
+  # and local branches from the project itself (CIRCLE_PROJECT)
+  # In addition, the code will differ between bash and powershell
   - &CHECKOUT
     run:
       name: Checkout code
       command: |
-        git clone -b "${CIRCLE_BRANCH}" "https://github.com/${CIRCLE_PROJECT_USERNAME}/${CIRCLE_PROJECT_REPONAME}.git" .
+        USERNAME=${CIRCLE_PR_USERNAME:-${CIRCLE_PROJECT_USERNAME}}
+        REPONAME=${CIRCLE_PR_REPONAME:-${CIRCLE_PROJECT_REPONAME}}
+        git clone "https://github.com/${USERNAME}/${REPONAME}.git" .
+        git checkout -b "${CIRCLE_BRANCH}" "${CIRCLE_SHA1}"
+        TERM=ansi git log -n 1 --pretty=oneline
 
   - &CHECKOUT_WINDOWS
     run:
       name: Checkout code
       command: |
-        git clone -b "$Env:CIRCLE_BRANCH" "https://github.com/$Env:CIRCLE_PROJECT_USERNAME/$Env:CIRCLE_PROJECT_REPONAME.git" .
+        $USERNAME = if ($Env:CIRCLE_PR_USERNAME -ne $null) { $Env:CIRCLE_PR_USERNAME } else { $Env:CIRCLE_PROJECT_USERNAME }
+        $REPONAME = if ($Env:CIRCLE_PR_REPONAME -ne $null) { $Env:CIRCLE_PR_REPONAME } else { $Env:CIRCLE_PROJECT_REPONAME }
+        git clone "https://github.com/$USERNAME/$REPONAME.git" .
+        git checkout -b "$Env:CIRCLE_BRANCH" "$Env:CIRCLE_SHA1"
+        git log -n 1 --pretty=oneline
 
   - &PREPARE_VIRTUALENV
     run: