From 59a615b3869eb8488a748e2aa51224a5e3d366bb Mon Sep 17 00:00:00 2001
From: Titus von Koeller <titus@vonkoeller.com>
Date: Tue, 2 Aug 2022 21:26:50 -0700
Subject: factored cuda_setup.main out into smaller modules and functions

---
 bitsandbytes/cuda_setup/env_vars.py | 51 +++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 bitsandbytes/cuda_setup/env_vars.py

(limited to 'bitsandbytes/cuda_setup/env_vars.py')

diff --git a/bitsandbytes/cuda_setup/env_vars.py b/bitsandbytes/cuda_setup/env_vars.py
new file mode 100644
index 0000000..536a7d8
--- /dev/null
+++ b/bitsandbytes/cuda_setup/env_vars.py
@@ -0,0 +1,51 @@
+import os
+from typing import Dict
+
+
+def to_be_ignored(env_var: str, value: str) -> bool:
+    ignorable = {
+        "PWD",  # PWD: this is how the shell keeps track of the current working dir
+        "OLDPWD",
+        "SSH_AUTH_SOCK",  # SSH stuff, therefore unrelated
+        "SSH_TTY",
+        "HOME",  # Linux shell default
+        "TMUX",  # Terminal Multiplexer
+        "XDG_DATA_DIRS",  # XDG: Desktop environment stuff
+        "XDG_RUNTIME_DIR",
+        "MAIL",  # something related to emails
+        "SHELL",  # binary for currently invoked shell
+        "DBUS_SESSION_BUS_ADDRESS",  # hardware related
+        "PATH",  # this is for finding binaries, not libraries
+        "LESSOPEN",  # related to the `less` command
+        "LESSCLOSE",
+        "_",  # current Python interpreter
+    }
+    return env_var in ignorable
+
+
+def might_contain_a_path(candidate: str) -> bool:
+    return "/" in candidate
+
+
+def is_active_conda_env(env_var: str) -> bool:
+    return "CONDA_PREFIX" == env_var
+
+
+def is_other_conda_env_var(env_var: str) -> bool:
+    return "CONDA" in env_var
+
+
+def is_relevant_candidate_env_var(env_var: str, value: str) -> bool:
+    return is_active_conda_env(env_var) or (
+        might_contain_a_path(value) and not
+        is_other_conda_env_var(env_var) and not
+        to_be_ignored(env_var, value)
+    )
+
+
+def get_potentially_lib_path_containing_env_vars() -> Dict[str, str]:
+    return {
+        env_var: value
+        for env_var, value in os.environ.items()
+        if is_relevant_candidate_env_var(env_var, value)
+    }
-- 
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