ci: Separate prod tarball extraction and install process.

This allows to run scripts between extraction and install
process.

It will be used to restore npm caches for production install jobs.

We extract the tarball in the working directory so that yarn.lock and
package.json are available to restore cache.

(And also so the path is deterministic).

.circleci/config.yml

@@ -99,14 +99,20 @@ aliases:
 
         mispipe ./tools/ci/setup-production ts
 
-  - &install_production
+  - &production_extract_tarball
     run:
-     name: install production
+     name: production extract tarball
      command: |
       sudo apt-get update
       # Install moreutils so we can use `ts` and `mispipe` in the following.
       sudo apt-get install -y moreutils
 
+      mispipe /tmp/production-extract-tarball ts
+
+  - &install_production
+    run:
+     name: install production
+     command: |
       sudo service rabbitmq-server restart
       mispipe /tmp/production ts
 
@@ -245,6 +251,7 @@ jobs:
             - success-http-headers.txt
             - production-helper
             - production
+            - production-extract-tarball
 
   "bionic-production-install-python3.6":
     docker:
@@ -262,6 +269,7 @@ jobs:
 
       - *create_cache_directories
       - *do_bionic_hack
+      - *production_extract_tarball
       - *restore_cache_package_json
       - *install_production
       - *save_cache_package_json

tools/ci/production-extract-tarball

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -e
+set -x
+
+ZULIP_PATH=~/zulip
+tar -xf /tmp/zulip-server-test.tar.gz -C "$ZULIP_PATH" --strip-components=1

tools/ci/production-helper

@@ -5,8 +5,7 @@
 set -e
 set -x
 
-ZULIP_PATH=$(mktemp -d)
-tar -xf /tmp/zulip-server-test.tar.gz -C "$ZULIP_PATH" --strip-components=1
+ZULIP_PATH=~/zulip
 
 # Do an apt upgrade to start with an up-to-date machine
 APT_OPTIONS=(-o 'Dpkg::Options::=--force-confdef' -o 'Dpkg::Options::=--force-confold')

tools/ci/setup-production

@@ -32,3 +32,4 @@ mv /tmp/tmp.*/zulip-server-test.tar.gz /tmp/
 cp -a tools/ci/success-http-headers.txt /tmp/success-http-headers.txt
 cp -a tools/ci/production /tmp/production
 cp -a tools/ci/production-helper /tmp/production-helper
+cp -a tools/ci/production-extract-tarball /tmp/production-extract-tarball