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5f923cd | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | # Copyright 2026 The ODML Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Virtual environment manager for LiteRT-LM."""
import os
import shutil
import subprocess
import sys
import click
class VenvManager:
"""Manages the virtual environment paths and binaries."""
def __init__(self, prefer_current_venv: bool = False):
self._self_managed_venv_dir = os.path.expanduser("~/.litert-lm/.venv")
if not prefer_current_venv:
self.venv_dir = self._self_managed_venv_dir
else:
self.venv_dir = os.environ.get(
"VIRTUAL_ENV",
sys.prefix
if sys.prefix != sys.base_prefix
else self._self_managed_venv_dir,
)
self.python_bin = os.path.join(self.venv_dir, "bin", "python")
self.pip_bin = os.path.join(self.venv_dir, "bin", "pip")
self.litert_torch_bin = os.path.join(self.venv_dir, "bin", "litert-torch")
self.uv_bin = os.path.join(self.venv_dir, "bin", "uv")
def ensure_venv(self):
"""Ensures that the virtual environment directory exists."""
if os.path.exists(self.venv_dir):
return
if self.venv_dir != self._self_managed_venv_dir:
# Note this should never happen.
raise RuntimeError(
f"Virtual environment directory not found: {self.venv_dir}"
)
click.echo(
click.style(
f"Creating virtual environment in {self.venv_dir}...", fg="cyan"
)
)
os.makedirs(os.path.dirname(self.venv_dir), exist_ok=True)
python_exe = sys.executable or "python3"
subprocess.run([python_exe, "-m", "venv", self.venv_dir], check=True)
def recreate_venv_if_self_managed(self):
"""Deletes and re-creates the virtual environment if it is self-managed.
This ensures we are using the latest litert-torch-nightly. Since uv has
local cache, if the version has been downloaded before, it will be very
fast.
"""
if self.venv_dir != self._self_managed_venv_dir:
# Only recreate if it's the default venv managed by the CLI.
return
if os.path.exists(self.venv_dir):
click.echo(
click.style(
f"Deleting virtual environment in {self.venv_dir}...", fg="cyan"
)
)
shutil.rmtree(self.venv_dir)
self.ensure_venv()
def ensure_binary(self, binary_path):
"""Ensures the binary exists, or installs it if using the default venv."""
if os.path.exists(binary_path):
return
self.ensure_venv()
if binary_path == self.pip_bin:
click.echo(click.style("Ensuring pip is installed...", fg="cyan"))
subprocess.run(
[
self.python_bin,
"-m",
"ensurepip",
"--default-pip",
],
check=True,
)
elif binary_path == self.uv_bin:
self.ensure_binary(self.pip_bin)
click.echo(
click.style(
"Installing uv into the virtual environment...", fg="cyan"
)
)
subprocess.run(
[
self.pip_bin,
"install",
"uv",
"-i",
"https://pypi.org/simple",
],
check=True,
)
elif binary_path == self.litert_torch_bin:
self.ensure_binary(self.uv_bin)
click.echo(click.style("Installing litert-torch with uv...", fg="cyan"))
subprocess.run(
[
self.uv_bin,
"pip",
"install",
"-i",
"https://pypi.org/simple",
"litert-torch-nightly",
"--python",
self.python_bin,
],
check=True,
)
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