Added: Support installing system dependencies of optional extra_requires components

checkdeps.py

@@ -1,4 +1,13 @@
-"""Check dependendies and give recommendations about how to satisfy them"""
+"""
+Check dependendies and give recommendations about how to satisfy them
+
+Limitations:
+
+    * Does not detect whether packages are already installed. Solving this requires writing more of a configuration
+    management system. Or we could switch to an existing one.
+    * Not fully PEP508 compliant. Not slightly. It makes bold assumptions about the simplicity of the contents of
+    EXTRAS_REQUIRE. This is fine because most developers do, too.
+"""
 
 from distutils.errors import CompileError
 try:
@@ -12,6 +21,29 @@ from importlib import import_module
 import os
 import sys
 
+from setup import EXTRAS_REQUIRE
+
+
+PROJECT_ROOT = os.path.abspath('..')
+sys.path.insert(0, PROJECT_ROOT)
+
+# OS-specific dependencies for optional components listed in EXTRAS_REQUIRE
+EXTRAS_REQUIRE_DEPS = {
+    # The values from setup.EXTRAS_REQUIRE
+    'python_prctl': {
+        # The packages needed for this requirement, by OS
+        "OpenBSD": [""],
+        "FreeBSD": [""],
+        "Debian": ["libcap-dev"],
+        "Ubuntu": [""],
+        "Ubuntu 12": [""],
+        "openSUSE": [""],
+        "Fedora": [""],
+        "Guix": [""],
+        "Gentoo": [""],
+    },
+}
+
 PACKAGE_MANAGER = {
     "OpenBSD": "pkg_add",
     "FreeBSD": "pkg install",
@@ -199,6 +231,7 @@ if not compiler:
 if prereqs:
     mandatory = list(x for x in prereqs if "optional" not in PACKAGES[x] or not PACKAGES[x]["optional"])
     optional = list(x for x in prereqs if "optional" in PACKAGES[x] and PACKAGES[x]["optional"])
+
     if mandatory:
         print "Missing mandatory dependencies: %s" % (" ".join(mandatory))
     if optional:
@@ -206,6 +239,28 @@ if prereqs:
         for package in optional:
             print PACKAGES[package].get('description')
 
+# Install the system dependencies of optional extras_require components
+OPSYS = detectOS()
+CMD = PACKAGE_MANAGER[OPSYS] if OPSYS in PACKAGE_MANAGER else 'UNKNOWN_INSTALLER'
+for lhs, rhs in EXTRAS_REQUIRE.items():
+    if rhs and any([
+        EXTRAS_REQUIRE_DEPS[x][OPSYS]
+        for x in rhs
+        if x in EXTRAS_REQUIRE_DEPS
+    ]):
+        rhs_cmd = ''.join([
+            CMD,
+            ' ',
+            ' '.join([
+                ''. join([
+                    xx for xx in EXTRAS_REQUIRE_DEPS[x][OPSYS]
+                ])
+                for x in rhs
+                if x in EXTRAS_REQUIRE_DEPS
+            ]),
+        ])
+        print "Optional dependency `pip install .[{}]` would require `{}` to be run as root".format(lhs, rhs_cmd)
+
 if (not compiler or prereqs) and detectOS() in PACKAGE_MANAGER:
     print "You can install the missing dependencies by running, as root:"
     if not compiler:

requirements.txt

@@ -1 +0,0 @@
-python_prctl

setup.py

@@ -1,13 +1,24 @@
 #!/usr/bin/env python2.7
 
 import os
-import sys
 import shutil
+
 from setuptools import setup, Extension
 from setuptools.command.install import install
 
 from src.version import softwareVersion
 
+
+EXTRAS_REQUIRE = {
+    'gir': ['pygobject'],
+    'notify2': ['notify2'],
+    'pyopencl': ['pyopencl'],
+    'prctl': ['python_prctl'],  # Named threads
+    'qrcode': ['qrcode'],
+    'sound;platform_system=="Windows"': ['winsound']
+}
+
+
 class InstallCmd(install):
     def run(self):
         # prepare icons directories
@@ -78,13 +89,7 @@ if __name__ == "__main__":
         # TODO: add keywords
         #keywords='',
         install_requires=installRequires,
-        extras_require={
-            'gir': ['pygobject'],
-            'qrcode': ['qrcode'],
-            'pyopencl': ['pyopencl'],
-            'notify2': ['notify2'],
-            'sound;platform_system=="Windows"': ['winsound']
-        },
+        extras_require=EXTRAS_REQUIRE,
         classifiers=[
             "License :: OSI Approved :: MIT License"
             "Operating System :: OS Independent",