Speed up CI: only build changed projects on push

Author: mikemaccana-edwardbot

.github/workflows/anchor.yml

@@ -53,8 +53,17 @@ jobs:
           }
 
           # Determine which projects to build and test
-          if [[ "${{ github.event_name }}" == "push" || "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+          if [[ "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+            # Workflow file changed or schedule — build everything
             projects=$(get_projects)
+          elif [[ "${{ github.event_name }}" == "push" ]]; then
+            # On push, only build projects with changes since parent commit
+            changed_files=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || echo "")
+            if [ -z "$changed_files" ]; then
+              projects=$(get_projects)
+            else
+              projects=$(echo "$changed_files" | while read file; do dirname "$file" | grep anchor | sed 's#/anchor/.*#/anchor#g'; done | grep -vE "$ignore_pattern" | sort -u)
+            fi
           elif [[ "${{ steps.changes.outputs.anchor }}" == "true" ]]; then
             changed_files=(${{ steps.changes.outputs.anchor_files }})
             projects=$(for file in "${changed_files[@]}"; do dirname "${file}" | grep anchor | sed 's#/anchor/.*#/anchor#g'; done | grep -vE "$ignore_pattern" | sort -u)

.github/workflows/native.yml

@@ -53,8 +53,17 @@ jobs:
           }
 
           # Determine which projects to build and test
-          if [[ "${{ github.event_name }}" == "push" || "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+          if [[ "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+            # Workflow file changed or schedule — build everything
             projects=$(get_projects)
+          elif [[ "${{ github.event_name }}" == "push" ]]; then
+            # On push, only build projects with changes since parent commit
+            changed_files=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || echo "")
+            if [ -z "$changed_files" ]; then
+              projects=$(get_projects)
+            else
+              projects=$(echo "$changed_files" | while read file; do dirname "$file" | grep native | sed 's#/native/.*#/native#g'; done | grep -vE "$ignore_pattern" | sort -u)
+            fi
           elif [[ "${{ steps.changes.outputs.native }}" == "true" ]]; then
             changed_files=(${{ steps.changes.outputs.native_files }})
             projects=$(for file in "${changed_files[@]}"; do dirname "${file}" | grep native | sed 's#/native/.*#/native#g'; done | grep -vE "$ignore_pattern" | sort -u)

.github/workflows/pinocchio.yml

@@ -53,8 +53,17 @@ jobs:
           }
 
           # Determine which projects to build and test
-          if [[ "${{ github.event_name }}" == "push" || "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+          if [[ "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+            # Workflow file changed or schedule — build everything
             projects=$(get_projects)
+          elif [[ "${{ github.event_name }}" == "push" ]]; then
+            # On push, only build projects with changes since parent commit
+            changed_files=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || echo "")
+            if [ -z "$changed_files" ]; then
+              projects=$(get_projects)
+            else
+              projects=$(echo "$changed_files" | while read file; do dirname "$file" | grep pinocchio | sed 's#/pinocchio/.*#/pinocchio#g'; done | grep -vE "$ignore_pattern" | sort -u)
+            fi
           elif [[ "${{ steps.changes.outputs.pinocchio }}" == "true" ]]; then
             changed_files=(${{ steps.changes.outputs.pinocchio_files }})
             projects=$(for file in "${changed_files[@]}"; do dirname "${file}" | grep pinocchio | sed 's#/pinocchio/.*#/pinocchio#g'; done | grep -vE "$ignore_pattern" | sort -u)

.github/workflows/quasar.yml

@@ -55,8 +55,17 @@ jobs:
           }
 
           # Determine which projects to build and test
-          if [[ "${{ github.event_name }}" == "push" || "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+          if [[ "${{ github.event_name }}" == "schedule" || "${{ steps.changes.outputs.workflow }}" == "true" ]]; then
+            # Workflow file changed or schedule — build everything
             projects=$(get_projects)
+          elif [[ "${{ github.event_name }}" == "push" ]]; then
+            # On push, only build projects with changes since parent commit
+            changed_files=$(git diff --name-only HEAD~1 HEAD 2>/dev/null || echo "")
+            if [ -z "$changed_files" ]; then
+              projects=$(get_projects)
+            else
+              projects=$(echo "$changed_files" | while read file; do dirname "$file" | grep quasar | sed 's#/quasar/.*#/quasar#g'; done | grep -vE "$ignore_pattern" | sort -u)
+            fi
           elif [[ "${{ steps.changes.outputs.quasar }}" == "true" ]]; then
             changed_files=(${{ steps.changes.outputs.quasar_files }})
             projects=$(for file in "${changed_files[@]}"; do dirname "${file}" | grep quasar | sed 's#/quasar/.*#/quasar#g'; done | grep -vE "$ignore_pattern" | sort -u)