diff --git a/package b/package
index de6ab43..6bc6969 100755
--- a/package
+++ b/package
@@ -17,7 +17,9 @@ def create_args_parser():
     parser.add_argument("-o", "--output", help="The path to the generated packages destination directory", default=".")
     parser.add_argument("-p", "--profile", help="The profile to use to package this project (default: debian)", choices=profile_names, default='debian')
     parser.add_argument("-a", "--architecture", help="The target architecture for the package (default: amd64)", default='amd64')
+    parser.add_argument("-b", "--base", help="Use the specified image instead of the profile's one", default='')
     parser.add_argument("--rebuild", help="Ignore cache and rebuild container's image", action="store_true", default=False)
+    parser.add_argument("--debug", help="Will add extra output and start the container in interactive mode", action="store_true", default=False)
 
     return parser
 
@@ -49,7 +51,7 @@ def get_cached_image_path(profile):
 
 def build_image(build_workspace, aci_file, base_image, profile):
 
-    acbuild_flags = ["--modify", aci_file, "--work-path", build_workspace]
+    acbuild_flags = ["--work-path", build_workspace]
 
     # Find and export base image from rkt' store
     name_pattern = base_image.split('/')[-1] + '$'
@@ -57,6 +59,7 @@ def build_image(build_workspace, aci_file, base_image, profile):
     rkt.export_image(image['id'], aci_file, rkt_flags=rkt_flags);
 
     # Build image
+    tamarin.run_acbuild(acbuild_flags+["begin", aci_file])
     tamarin.run_acbuild(acbuild_flags+["set-name", "image_{:d}".format(pid)])
     tamarin.run_acbuild(acbuild_flags+["mount", "add", "src", "/src", "--read-only"])
     tamarin.run_acbuild(acbuild_flags+["mount", "add", "dist", "/dist"])
@@ -73,6 +76,9 @@ def build_image(build_workspace, aci_file, base_image, profile):
     # Run hooks
     tamarin.run_profile_hooks(profile, 'containerbuild', cwd=build_workspace, env=hooks_env)
 
+    tamarin.run_acbuild(acbuild_flags+["write", "--overwrite", aci_file])
+    tamarin.run_acbuild(acbuild_flags+["end"])
+
     return aci_file
 
 def cleanup(build_workspace, rkt_flags):
@@ -126,7 +132,7 @@ if __name__ == "__main__":
     rkt_store = tamarin.get_workspace_subdir('store')
     rkt_flags = ["--dir={:s}".format(rkt_store)]
 
-    base_image = profile['profile']['default_image']
+    base_image = args.base if args.base != '' else profile['profile']['default_image']
 
     # If the base image is Docker-based, download it
     if base_image.startswith('docker://'):
@@ -147,23 +153,30 @@ if __name__ == "__main__":
         # Cache image
         shutil.copyfile(aci_file, cached_image_file)
 
+    # rkt run arguments
+    rkt_args = [
+      "run",
+      "--insecure-options=image",
+      aci_file, "--net=host",
+      "--volume=src,kind=host,source={:s}".format(project_dir),
+      "--volume=dist,kind=host,source={:s}".format(output_dir),
+      "--volume=tamarin-hooks,kind=host,source={:s}".format(tamarin.get_hooks_dir()),
+      "--volume=tamarin-lib,kind=host,source={:s}".format(tamarin.get_lib_dir()),
+      "--volume=tamarin-profiles,kind=host,source={:s}".format(tamarin.get_profiles_dir())
+    ]
+
+    # Use environment proxy if defined
+    for proxy_var in ['HTTP_PROXY', 'HTTPS_PROXY', 'http_proxy', 'https_proxy']:
+      if proxy_var in os.environ:
+        rkt_args += ["--set-env={:s}={:s}".format(proxy_var, os.environ[proxy_var])]
+
+    if args.debug:
+      rkt_args += ["--interactive", "--exec", "/bin/bash"]
+    else:
+      rkt_args += ["--exec", "/usr/bin/python3", "--", "/tamarin/lib/build.py", args.profile, args.architecture]
+
     # Start container
-    rkt.run(rkt_flags+[
-        "run",
-        "--insecure-options=image",
-        aci_file, "--net=host",
-        "--volume=src,kind=host,source={:s}".format(project_dir),
-        "--volume=dist,kind=host,source={:s}".format(output_dir),
-        "--volume=tamarin-hooks,kind=host,source={:s}".format(tamarin.get_hooks_dir()),
-        "--volume=tamarin-lib,kind=host,source={:s}".format(tamarin.get_lib_dir()),
-        "--volume=tamarin-profiles,kind=host,source={:s}".format(tamarin.get_profiles_dir()),
-        "--set-env=HTTP_PROXY={:s}".format(os.environ['HTTP_PROXY']),
-        "--set-env=HTTPS_PROXY={:s}".format(os.environ['HTTP_PROXY']),
-        "--set-env=http_proxy={:s}".format(os.environ['http_proxy']),
-        "--set-env=https_proxy={:s}".format(os.environ['https_proxy']),
-        #"--interactive", "--exec", "/bin/bash"
-        "--exec", "/usr/bin/python3", "--", "/tamarin/lib/build.py", args.profile, args.architecture
-    ], as_root=True)
+    rkt.run(rkt_flags+rkt_args, as_root=True)
 
     # Cleanup
     cleanup(build_workspace, rkt_flags)