fix(assert_clean_master): Output error messages to stderr, not stdout (…

…spinnaker#7993)

app/scripts/modules/assert_clean_master.sh

@@ -6,11 +6,14 @@ cd "$(dirname "$0")" || exit;
 # (a local branch that tracks decks 'master' branch)
 CURRENTBRANCH=$(git symbolic-ref --short HEAD)
 TRACKING=$(git rev-parse --abbrev-ref --symbolic-full-name "@{u}")
+function error() {
+  echo "$*" >&2
+}
 
 if [ $? -ne 0 ] ; then
-  echo "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
-  echo
-  echo "The current branch '$CURRENTBRANCH' is not tracking any remote."
+  error "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
+  error
+  error "The current branch '$CURRENTBRANCH' is not tracking any remote."
   exit 1
 fi
 
@@ -21,28 +24,28 @@ DECK_HTTPS="https://github.com/spinnaker/deck.git"
 DECK_GIT="[email protected]:spinnaker/deck.git"
 
 if [ "x${REMOTE_URL}" != "x${DECK_HTTPS}" ] && [ "x${REMOTE_URL}" != "x${DECK_GIT}" ] ; then
-  echo "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
-  echo
-  echo "The current branch '${CURRENTBRANCH}' is tracking '${TRACKING}'."
-  echo "However, the remote '${REMOTE}' has a URL of '${REMOTE_URL}'."
-  echo "The tracked remote should be either '${DECK_HTTPS}' or '${DECK_GIT}'."
+  error "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
+  error
+  error "The current branch '${CURRENTBRANCH}' is tracking '${TRACKING}'."
+  error "However, the remote '${REMOTE}' has a URL of '${REMOTE_URL}'."
+  error "The tracked remote should be either '${DECK_HTTPS}' or '${DECK_GIT}'."
   exit 2
 fi
 
 if [ "x${BRANCH}" != "xmaster" ] ; then
-  echo "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
-  echo
-  echo "The current branch '${CURRENTBRANCH}' is tracking '${TRACKING}'."
+  error "You must be on 'master' (a branch tracking the upstream Deck 'master' branch)."
+  error
+  error "The current branch '${CURRENTBRANCH}' is tracking '${TRACKING}'."
   exit 3
 fi
 
 # Assert that the local branch is "clean" so we don't publish any uncommitted code
 DIRTY_COMMITS=$(git status --porcelain);
 if [ "x${DIRTY_COMMITS}" != "x" ] ; then
-  echo "Your working copy is not clean (you have uncommited changes)."
-  echo
-  echo "Please stash these changes before publishing using 'git stash'.";
-  echo
+  error "Your working copy is not clean (you have uncommited changes)."
+  error
+  error "Please stash these changes before publishing using 'git stash'.";
+  error
   git status --porcelain
   exit 4;
 fi
@@ -52,21 +55,21 @@ git fetch "$REMOTE"
 
 STATUS=$(git status -sb --porcelain)
 if [[ ${STATUS} =~ [Bb]ehind ]] ; then
-  echo "Your local branch is behind the upstream branch '${TRACKING}'."
-  echo
-  echo "The upstream branch has additional commits that would not be included in the published package."
-  echo "Run 'git pull' to update your local branch."
-  echo
+  error "Your local branch is behind the upstream branch '${TRACKING}'."
+  error
+  error "The upstream branch has additional commits that would not be included in the published package."
+  error "Run 'git pull' to update your local branch."
+  error
   git status -sb
   exit 5
 fi
 
 if [[ ${STATUS} =~ [Aa]head ]] ; then
-  echo "Your local branch is ahead of the upstream branch '${TRACKING}'."
-  echo
-  echo "Your local branch has additional commits that are not reflected in the upstream branch."
-  echo "Add your commits to the upstream branch by creating a pull request."
-  echo
+  error "Your local branch is ahead of the upstream branch '${TRACKING}'."
+  error
+  error "Your local branch has additional commits that are not reflected in the upstream branch."
+  error "Add your commits to the upstream branch by creating a pull request."
+  error
   git status -sb
   exit 6
 fi