OSS Setup (#4)

* add local env setup script

* add push to oss script

* oss initial commit

public/README.md

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+# Dataline Public Repo

tools/local_env/setup.sh

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+#!/usr/bin/env bash
+
+set -e
+
+function _error() {
+  echo "$@"
+  exit 1
+}
+
+function main() {
+  [[ -e .root ]] || _error "Must run from root"
+
+  git remote add oss https://github.com/datalineio/public.git
+}
+
+main "$@"

tools/oss/push_oss.sh

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+#!/usr/bin/env bash
+
+set -e
+
+_usage="
+Usage: ./tools/oss/push_oss.sh <target-branch> <force (optional)>
+Example: ./tools/oss/push_oss.sh my-branch force
+"
+
+function _error() {
+  echo "$@"
+  echo "$_usage"
+  exit 1
+}
+
+function _in_sync_with_remote() {
+  # https://stackoverflow.com/a/3278427
+  git remote update
+  UPSTREAM='@{u}'
+  echo "checking local commit history against remote: $(git rev-parse --symbolic-full-name --abbrev-ref ${UPSTREAM})"
+  LOCAL=$(git rev-parse @)
+  REMOTE=$(git rev-parse "$UPSTREAM")
+  BASE=$(git merge-base @ "$UPSTREAM")
+
+  if [ $LOCAL = $REMOTE ]; then
+      echo "Up-to-date"
+  elif [ $LOCAL = $BASE ]; then
+      echo "Need to pull"
+      exit 1
+  elif [ $REMOTE = $BASE ]; then
+      echo "Need to push"
+      exit 1
+  else
+      echo "Diverged"
+      exit 1
+  fi
+}
+
+function _on_master() {
+  # only push master to downstream repo.
+  CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
+  if [[ "$CURRENT_BRANCH" != "master" ]]; then
+    _error 'Can only push to target branch master while on master branch.';
+    exit 1;
+  fi
+}
+
+# attempts to push the public dir to the specified branch in the dataline _public_ repository.
+# * verifies that the branch being pushed is in sync with the origin remote of the monorepo.
+# * allows force push (except when pushing to master--if you need to do this, do it manually).
+# * only allows pushes to master from the master branch.
+function main() {
+  [[ -e .root ]] || _error "Must run from root"
+  TARGET_BRANCH=$1; shift || _error "Missing target branch"
+  FORCE_RAW=$1;
+  FORCE=false
+
+  if [[ "$FORCE_RAW" = "force" ]]; then
+    FORCE=true
+  fi
+
+  echo "target branch: ${TARGET_BRANCH}"
+  echo "force: ${FORCE}"
+
+  # if pushing to master on the oss repo, must push from master.
+  if [[ "$TARGET_BRANCH" = "master" ]]; then
+    _on_master
+  fi
+
+  if [[ "$TARGET_BRANCH" = "master" && "$FORCE" = true ]]; then
+    _error "cannot force push to master."
+  fi
+
+  # do not push to oss repo, if local branch is not in sync with origin in monorepo.
+  _in_sync_with_remote
+
+  if [[ "$FORCE" = true ]]
+  then
+    git push oss `git subtree split --prefix public`:"${TARGET_BRANCH}"  --force
+  else
+    git subtree push --prefix=public oss "${TARGET_BRANCH}"
+  fi
+}
+
+main "$@"