@@ -11,24 +11,34 @@
 def main():
     # Parse arguments
     parser = argparse.ArgumentParser(
-        description='Bundle a Python install into an AppImage')
-    subparsers = parser.add_subparsers(title='builder',
-                                       help='Appimage builder',
-                                       dest='builder')
+        prog='python-appimage',
+        description='Bundle a Python installation into an AppImage')
+    subparsers = parser.add_subparsers(title='command',
+                                       help='Build or install command',
+                                       dest='command')
 
     parser.add_argument('-q', '--quiet', help='disable logging',
         dest='verbosity', action='store_const', const=logging.ERROR)
     parser.add_argument('-v', '--verbose', help='print extra information',
         dest='verbosity', action='store_const', const=logging.DEBUG)
 
-    local_parser = subparsers.add_parser('local')
+    install_parser = subparsers.add_parser('install',
+        description='Install binary dependencies')
+    install_parser.add_argument('binary', nargs='+',
+        choices=('appimagetool', 'patchelf'), help='one or more binary name')
+
+    local_parser = subparsers.add_parser('local',
+        description='Bundle a local Python installation')
     local_parser.add_argument('-d', '--destination',
                               help='AppImage destination')
     local_parser.add_argument('-p', '--python', help='python executable')
 
-    manylinux_parser = subparsers.add_parser('manylinux')
-    manylinux_parser.add_argument('tag', help='manylinux image tag')
-    manylinux_parser.add_argument('abi', help='python ABI')
+    manylinux_parser = subparsers.add_parser('manylinux',
+        description='Bundle a manylinux Python installation using docker')
+    manylinux_parser.add_argument('tag',
+        help='manylinux image tag (e.g. 2010_x86_64)')
+    manylinux_parser.add_argument('abi',
+        help='python ABI (e.g. cp37-cp37m)')
 
     manylinux_parser.add_argument('--contained', help=argparse.SUPPRESS,
                                   action='store_true', default=False)
@@ -39,9 +49,10 @@ def main():
     if args.verbosity:
         logging.getLogger().setLevel(args.verbosity)
 
-    # Call the AppImage builder
-    builder = import_module('.builders.' + args.builder, package=__package__)
-    builder.build(*builder._unpack_args(args))
+    # Call the requested command
+    command = import_module('.commands.' +
+                            args.command, package=__package__)
+    command.execute(*command._unpack_args(args))
 
 
 if __name__ == "__main__":
 
@@ -0,0 +1,26 @@
+import os
+
+from ..utils import deps
+from ..utils.log import log
+
+
+
+
+__all__ = ['execute']
+
+
+def _unpack_args(args):
+    '''Unpack command line arguments
+    '''
+    return args.binary
+
+
+def execute(*args):
+    '''Install the requested dependencies
+    '''
+    bindir = os.path.dirname(deps.PATCHELF)
+    for binary in args:
+        installed = getattr(deps, 'ensure_' + binary)()
+        words = 'has been' if installed else 'already' 
+        log('INSTALL',
+            '{:} {:} installed in {:}'.format(binary, words, bindir))
@@ -2,11 +2,11 @@
 import os
 import shutil
 
-from ..actions import build_appimage, relocate_python
+from ..appimage import build_appimage, relocate_python
 from ..utils.tmp import TemporaryDirectory
 
 
-__all__ = ['build']
+__all__ = ['execute']
 
 
 def _unpack_args(args):
@@ -15,7 +15,7 @@ def _unpack_args(args):
     return args.python, args.destination
 
 
-def build(python=None, destination=None):
+def execute(python=None, destination=None):
     '''Build a Python AppImage using a local installation
     '''
     pwd = os.getcwd()
 
@@ -4,13 +4,13 @@
 import shutil
 import sys
 
-from ..actions import build_appimage, relocate_python
+from ..appimage import build_appimage, relocate_python
 from ..utils.docker import docker_run
 from ..utils.fs import copy_tree
 from ..utils.tmp import TemporaryDirectory
 
 
-__all__ = ['build']
+__all__ = ['execute']
 
 
 def _unpack_args(args):
@@ -31,7 +31,7 @@ def _get_appimage_name(abi, tag):
         fullversion, abi, tag)
 
 
-def build(tag, abi, contained=False):
+def execute(tag, abi, contained=False):
     '''Build a Python AppImage using a manylinux docker image
     '''
 
 
@@ -33,7 +33,7 @@ def ensure_appimagetool():
     '''Fetch appimagetool from the web if not available locally
     '''
     if os.path.exists(APPIMAGETOOL):
-        return
+        return False
 
     appimage = 'appimagetool-{0:}.AppImage'.format(_ARCH)
     baseurl = 'https://github.com/AppImage/AppImageKit/releases/'              \
@@ -53,6 +53,8 @@ def ensure_appimagetool():
     if not os.path.exists(APPIMAGETOOL):
         os.symlink(appdir_name + '/AppRun', APPIMAGETOOL)
 
+    return True
+
 
 # Installers for dependencies
 def ensure_excludelist():
@@ -72,7 +74,7 @@ def ensure_patchelf():
     '''Fetch PatchELF from the web if not available locally
     '''
     if os.path.exists(PATCHELF):
-        return
+        return False
 
     iarch = 'i386' if _ARCH == 'i686' else _ARCH
     appimage = 'patchelf-{0:}.AppImage'.format(iarch)
@@ -88,3 +90,5 @@ def ensure_patchelf():
         system('./' + appimage, '--appimage-extract')
         copy_file('squashfs-root/usr/bin/patchelf', patchelf)
     os.chmod(patchelf, stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)
+
+    return True