feat: Add skeleton for the "installer" package

src/ai/backend/install/BUILD

@@ -0,0 +1,61 @@
+python_sources(
+    name="src",
+    dependencies=[
+        ":resources",
+    ],
+)
+
+visibility_private_component(
+    allowed_dependents=[],
+    allowed_dependencies=[
+        "//src/ai/backend/cli/**",
+        "//src/ai/backend/common/**",
+    ]
+)
+
+python_distribution(
+    name="dist",
+    dependencies=[
+        ":src",
+        "!!stubs/trafaret:stubs",
+    ],
+    provides=python_artifact(
+        name="backend.ai-install",
+        description="Backend.AI Installer",
+        license="MIT",
+    ),
+    entry_points={
+        "backendai_cli_v10": {
+            "install": "ai.backend.install.cli:main",
+        },
+    },
+    generate_setup=True,
+    tags=["wheel"],
+)
+
+pex_binary(
+    name="pex",
+    entry_point="ai.backend.cli.__main__",
+    dependencies=[
+        ":src",
+        ":buildscript",
+        "!!stubs/trafaret:stubs",
+    ],
+)
+
+scie_binary(
+    name="backendai-install",
+    dependencies=[":pex"],
+)
+
+resource(name="version", source="VERSION")
+resource(name="buildscript", source="BUILD")
+resources(
+    name="resources",
+    dependencies=[
+        ":version",
+    ],
+    sources=[
+        "**/py.typed",
+    ],
+)

src/ai/backend/install/README.md

@@ -0,0 +1,7 @@
+Backend.AI Plugin Subsystem
+===========================
+
+Package Structure
+-----------------
+
+* `ai.backend.plugin`: Abstract types for plugins and a common base plugin set

src/ai/backend/install/VERSION

@@ -0,0 +1 @@
+../../../../VERSION

src/ai/backend/install/__init__.py

@@ -0,0 +1,3 @@
+from pathlib import Path
+
+__version__ = (Path(__file__).parent / "VERSION").read_text().strip()

src/ai/backend/install/cli.py

@@ -0,0 +1,26 @@
+import click
+
+from ai.backend.install import __version__
+
+from .types import InstallModes
+
+
+@click.command(
+    context_settings={
+        "help_option_names": ["-h", "--help"],
+    },
+)
+@click.option(
+    "--mode",
+    type=click.Choice(InstallModes._member_names_, case_sensitive=False),
+    default=None,
+    help="Override the installation mode. [default: auto-detect]",
+)
+@click.version_option(version=__version__)
+@click.pass_context
+def main(
+    ctx: click.Context,
+    mode: InstallModes | None,
+) -> None:
+    """The installer"""
+    print(f"installer main: {mode}")

src/ai/backend/install/types.py

@@ -0,0 +1,6 @@
+import enum
+
+
+class InstallModes(enum.StrEnum):
+    DEV = "dev"
+    PACKAGE = "pkg"