Update Buildroot reference in HAL workflow and README to 2025.05-rc1; add nil check in Stop methods for binary, python, and wasm algorithms (#443)

Signed-off-by: Sammy Oina <sammyoina@gmail.com>

.github/workflows/hal.yml

@@ -56,7 +56,7 @@ jobs:
         with:
           repository: "buildroot/buildroot"
           path: buildroot
-          ref: 2024.11-rc2
+          ref: 2025.05-rc1
 
       - name: Build hal
         run: |

agent/algorithm/binary/binary.go

@@ -57,6 +57,10 @@ func (b *binary) Stop() error {
 		return nil
 	}
 
+	if b.cmd.Process == nil {
+		return nil
+	}
+
 	if err := b.cmd.Process.Kill(); err != nil {
 		return fmt.Errorf("error stopping algorithm: %v", err)
 	}

agent/algorithm/python/python.go

@@ -114,6 +114,10 @@ func (p *python) Stop() error {
 		return nil
 	}
 
+	if p.cmd.Process == nil {
+		return nil
+	}
+
 	if err := p.cmd.Process.Kill(); err != nil {
 		return fmt.Errorf("error stopping algorithm: %v", err)
 	}

agent/algorithm/wasm/wasm.go

@@ -63,6 +63,10 @@ func (w *wasm) Stop() error {
 		return nil
 	}
 
+	if w.cmd.Process == nil {
+		return nil
+	}
+
 	if err := w.cmd.Process.Kill(); err != nil {
 		return fmt.Errorf("error stopping algorithm: %v", err)
 	}

hal/linux/README.md

@@ -10,7 +10,7 @@ HAL uses [Buildroot](https://buildroot.org/)'s [_External Tree_ mechanism](https
 git clone git@github.com:ultravioletrs/cocos.git
 git clone git@github.com:buildroot/buildroot.git
 cd buildroot
-git checkout 2024.11-rc2
+git checkout 2025.05-rc1
 make BR2_EXTERNAL=../cocos/hal/linux cocos_defconfig
 # Execute 'make menuconfig' only if you want to make additional configuration changes to Buildroot.
 make menuconfig