Add script for generating multiple jobs and workflows

This lets us choose the length and parallelism of our test runs.

Scripts/set-ci-length-and-parallelism.sh

@@ -0,0 +1,104 @@
+#!/bin/bash
+
+set -e
+
+# Usage:
+# ./set-ci-length-and-parallelism.sh --workflows <num> --jobs-per-workflow <num>
+
+# Check dependencies.
+if ! which yq > /dev/null; then
+  echo "You need to install yq." 2>&1
+  exit 1
+fi
+
+# Grab and validate command-line options.
+
+# https://stackoverflow.com/questions/192249/how-do-i-parse-command-line-arguments-in-bash
+while [[ "$#" -gt 0 ]]; do
+  case $1 in
+    --workflows)
+      if [[ -z "$2" ]]; then
+        echo "You must specify the number of workflows." 2>&1
+        exit 1
+      fi
+      num_workflows="$2"
+      shift
+      ;;
+    --jobs-per-workflow)
+      if [[ -z "$2" ]]; then
+        echo "You must specify the number of jobs per workflow." 2>&1
+        exit 1
+      fi
+      jobs_per_workflow="$2"
+      shift
+      ;;
+    *)
+      echo "Unknown parameter passed: $1" 2>&1
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+if [[ -z $num_workflows ]]; then
+  echo "You need to specify the number of workflows (--workflows)." 2>&1
+  exit 1
+fi
+
+if [[ ! $num_workflows =~ ^-?[0-9]+$ ]]; then
+  echo "The number of workflows must be a number." 2>&1
+  exit 1
+fi
+
+if [[ $num_workflows -lt 1 ]]; then
+  echo "The number of workflows must be 1 or more." 2>&1
+  exit 1
+fi
+
+if [[ -z $jobs_per_workflow ]]; then
+  echo "You need to specify the number of jobs per workflow (--jobs-per-workflow)." 2>&1
+  exit 1
+fi
+
+if [[ ! $jobs_per_workflow =~ ^-?[0-9]+$ ]]; then
+  echo "The number of jobs per workflow must be a number." 2>&1
+  exit 1
+fi
+
+if [[ $jobs_per_workflow -lt 1 ]]; then
+  echo "The number of jobs per workflow must be 1 or more." 2>&1
+  exit 1
+fi
+
+workflow_file_without_extension=".github/workflows/integration-test-iOS16_2"
+workflow_file_extension=".yaml"
+
+workflow_file="${workflow_file_without_extension}${workflow_file_extension}"
+workflow_name=$(yq .name $workflow_file)
+
+# First, we apply the number of jobs per workflow.
+
+yq -i '(.jobs.check | key) = "check-1"' $workflow_file
+yq -i "(.jobs.check-1.steps[] | select(.with.path == \"xcresult-bundles.tar.gz\")).with.name = \"xcresult-bundles-1.tar.gz\"" $workflow_file
+
+for ((i=2; i <= $jobs_per_workflow; i += 1))
+do
+  yq -i ".jobs.check-${i} = .jobs.check-$(($i-1))" $workflow_file
+  yq -i ".jobs.check-${i}.needs = [\"check-$(($i-1))\"]" $workflow_file
+  yq -i "(.jobs.check-${i}.steps[] | select(.with.path == \"xcresult-bundles.tar.gz\")).with.name = \"xcresult-bundles-${i}.tar.gz\"" $workflow_file
+done
+
+# Now, we duplicate the workflow file the requested number of times.
+
+mv $workflow_file "${workflow_file_without_extension}-1${workflow_file_extension}"
+
+for ((i=1; i <= $num_workflows; i += 1))
+do
+  new_workflow_file="${workflow_file_without_extension}-${i}${workflow_file_extension}"
+
+  if [[ $i -gt 1 ]]; then
+    cp "${workflow_file_without_extension}-$((i-1))${workflow_file_extension}" $new_workflow_file
+  fi
+
+  yq -i ".name = \"${workflow_name} (workflow ${i})\"" $new_workflow_file
+done