Move exit_unless_command_exists to common utils

Signed-off-by: Henri Rosten <[email protected]>

src/common/utils.py

@@ -14,6 +14,8 @@
 import logging
 import subprocess
 import importlib.metadata
+from shutil import which
+
 import packaging.version
 from tabulate import tabulate
 from colorlog import ColoredFormatter, default_log_colors
@@ -138,6 +140,14 @@ def exec_cmd(
         return None
 
 
+def exit_unless_command_exists(name):
+    """Check if `name` is an executable in PATH"""
+    name_is_in_path = which(name) is not None
+    if not name_is_in_path:
+        LOG.fatal("command '%s' is not in PATH", name)
+        sys.exit(1)
+
+
 def exit_unless_nix_artifact(path, force_realise=False):
     """
     Exit with error if `path` is not a nix artifact. If `force_realize` is True,

src/nixmeta/main.py

@@ -5,12 +5,10 @@
 
 """ Python script for summarizing nixpkgs meta-attributes """
 
-import sys
 import argparse
 import pathlib
-import shutil
 from nixmeta.scanner import NixMetaScanner
-from common.utils import LOG, set_log_verbosity
+from common.utils import set_log_verbosity, exit_unless_command_exists
 
 
 ################################################################################
@@ -68,24 +66,13 @@ def _getargs():
 ###############################################################################
 
 
-def _exit_unless_command_exists(name):
-    """Check if `name` is an executable in PATH"""
-    name_is_in_path = shutil.which(name) is not None
-    if not name_is_in_path:
-        LOG.fatal("command '%s' is not in PATH", name)
-        sys.exit(1)
-
-
-###############################################################################
-
-
 def main():
     """main entry point"""
     args = _getargs()
     set_log_verbosity(args.verbose)
     # Fail early if the following commands are not in PATH
-    _exit_unless_command_exists("nix")
-    _exit_unless_command_exists("nix-env")
+    exit_unless_command_exists("nix")
+    exit_unless_command_exists("nix-env")
     # Scan metadata from the flakeref pinned nixpkgs
     scanner = NixMetaScanner()
     scanner.scan(args.flakeref)

src/vulnxscan/vulnxscan_cli.py

@@ -22,7 +22,6 @@
 import time
 import urllib.parse
 from tempfile import NamedTemporaryFile
-from shutil import which
 
 import pandas as pd
 import numpy as np
@@ -42,6 +41,7 @@
     df_from_csv_file,
     df_log,
     exit_unless_nix_artifact,
+    exit_unless_command_exists,
     nix_to_repology_pkg_name,
     parse_version,
     version_distance,
@@ -761,14 +761,6 @@ def _is_json(path):
         return False
 
 
-def _exit_unless_command_exists(name):
-    """Check if `name` is an executable in PATH"""
-    name_is_in_path = which(name) is not None
-    if not name_is_in_path:
-        LOG.fatal("command '%s' is not in PATH", name)
-        sys.exit(1)
-
-
 ################################################################################
 
 # Whitelist
@@ -868,8 +860,8 @@ def main():
     set_log_verbosity(args.verbose)
 
     # Fail early if following commands are not in path
-    _exit_unless_command_exists("grype")
-    _exit_unless_command_exists("vulnix")
+    exit_unless_command_exists("grype")
+    exit_unless_command_exists("vulnix")
 
     target_path_abs = args.TARGET.resolve().as_posix()
     scanner = VulnScan()