Add apt-cacher-ng support to Debian stages for improved build performance

stages/org.osbuild.apt

@@ -40,11 +40,23 @@ def main(tree, options):
     recommends = options.get("recommends", False)
     unauthenticated = options.get("unauthenticated", False)
     update = options.get("update", True)
+    apt_proxy = options.get("apt_proxy")
     
     if not packages:
         print("No packages specified for installation")
         return 1
     
+    # Configure apt proxy if specified
+    if apt_proxy:
+        print(f"Configuring apt proxy: {apt_proxy}")
+        proxy_config = f"""Acquire::http::Proxy "{apt_proxy}";
+Acquire::https::Proxy "{apt_proxy}";
+"""
+        proxy_file = os.path.join(tree, "etc/apt/apt.conf.d/99proxy")
+        os.makedirs(os.path.dirname(proxy_file), exist_ok=True)
+        with open(proxy_file, "w") as f:
+            f.write(proxy_config)
+    
     # Update package lists if requested
     if update:
         print("Updating package lists...")

stages/org.osbuild.apt.meta.json

@@ -26,6 +26,10 @@
         "type": "boolean",
         "default": true,
         "description": "Update package lists before installation"
+      },
+      "apt_proxy": {
+        "type": "string",
+        "description": "apt-cacher-ng proxy URL (e.g., http://localhost:3142)"
       }
     },
     "required": ["packages"]

stages/org.osbuild.debootstrap

@@ -8,7 +8,7 @@ import shutil
 import osbuild.api
 
 
-def run_debootstrap(suite, target, mirror, arch=None, variant=None, extra_packages=None):
+def run_debootstrap(suite, target, mirror, arch=None, variant=None, extra_packages=None, apt_proxy=None):
     """Run debootstrap to create base Debian filesystem"""
     
     cmd = ["debootstrap"]
@@ -22,6 +22,11 @@ def run_debootstrap(suite, target, mirror, arch=None, variant=None, extra_packag
     if extra_packages:
         cmd.extend(["--include", ",".join(extra_packages)])
     
+    # Add proxy configuration if specified
+    if apt_proxy:
+        cmd.extend(["--keyring", "/usr/share/keyrings/debian-archive-keyring.gpg"])
+        # debootstrap doesn't directly support proxy, but we'll configure it after creation
+    
     cmd.extend([suite, target, mirror])
     
     print(f"Running debootstrap: {' '.join(cmd)}")
@@ -63,6 +68,7 @@ def main(tree, options):
     arch = options.get("arch")
     variant = options.get("variant", "minbase")
     extra_packages = options.get("extra_packages", [])
+    apt_proxy = options.get("apt_proxy")
     
     if not suite:
         print("No suite specified for debootstrap")
@@ -77,12 +83,23 @@ def main(tree, options):
         print(f"Creating base Debian filesystem in {temp_dir}")
         
         # Run debootstrap
-        if not run_debootstrap(suite, temp_dir, mirror, arch, variant, extra_packages):
+        if not run_debootstrap(suite, temp_dir, mirror, arch, variant, extra_packages, apt_proxy):
             return 1
         
         # Set up apt sources
         setup_apt_sources(temp_dir, suite, mirror)
         
+        # Configure apt proxy if specified
+        if apt_proxy:
+            print(f"Configuring apt proxy: {apt_proxy}")
+            proxy_config = f"""Acquire::http::Proxy "{apt_proxy}";
+Acquire::https::Proxy "{apt_proxy}";
+"""
+            proxy_file = os.path.join(temp_dir, "etc/apt/apt.conf.d/99proxy")
+            os.makedirs(os.path.dirname(proxy_file), exist_ok=True)
+            with open(proxy_file, "w") as f:
+                f.write(proxy_config)
+        
         # Copy files to target tree
         print(f"Copying filesystem to target tree: {tree}")
         

stages/org.osbuild.debootstrap.meta.json

@@ -31,6 +31,10 @@
         },
         "default": [],
         "description": "Additional packages to include in base filesystem"
+      },
+      "apt_proxy": {
+        "type": "string",
+        "description": "apt-cacher-ng proxy URL (e.g., http://localhost:3142)"
       }
     },
     "required": ["suite", "mirror"]