1 files changed, 64 insertions, 0 deletions
diff --git a/build_depends.py b/build_depends.py
new file mode 100755
index 000000000000..dd187493758b
--- /dev/null
+++ b/build_depends.py
@@ -0,0 +1,64 @@
+#!/usr/bin/env python3
+
+import logging
+import subprocess
+import sys
+from pathlib import Path
+from collections import defaultdict
+
+from camisole.languages import Lang, load_builtins
+
+load_builtins()
+
+
+def by_name(name):
+    return Lang._full_registry[name]
+
+
+OVERWRITE = {
+    # java packages consist of symlinks to handle both Java 7 & 8, so we force
+    # the version (8) here
+    by_name('java'): {'/usr/lib/jvm/java-8-openjdk/bin/java',
+                      '/usr/lib/jvm/java-8-openjdk/bin/javac'},
+    # go is provided by both 'go' and 'gcc-go'
+    by_name('go'): {'/usr/lib/go/bin/go'},
+}
+
+
+def list_paths():
+    for lang in Lang._full_registry:
+        cls = by_name(lang)
+        if cls in OVERWRITE:
+            for path in OVERWRITE[cls]:
+                yield cls, Path(path)
+            continue
+        for p in cls.required_binaries():
+            yield cls, Path(p.cmd)
+
+
+def get_package(binary):
+    try:
+        pkg = (subprocess.check_output(['pkgfile', '-qb', binary])
+               .decode().split('\n')[0]) or None
+        return pkg
+    except subprocess.CalledProcessError:
+        return None
+
+
+if __name__ == '__main__':
+    packages = defaultdict(set)
+    for lang, binary in list_paths():
+        pkg = get_package(binary)
+        if pkg is None:
+            logging.error("no package for %s", binary)
+            continue
+        packages[pkg].add(lang)
+    packages.pop('python', None)  # already a strong dependency
+    packages = sorted(packages.items())
+    lines = ["{:<20} # handle {} sources".format(
+        "'{}'{}".format(pkg, ')' if i == len(packages) - 1 else ''),
+        ', '.join(sorted(lang.name for lang in langs)))
+        for i, (pkg, langs) in enumerate(packages)]
+    prefix = 'depends=('
+    print('{}{}'.format(prefix, lines[0]))
+    print('\n'.join(' ' * len(prefix) + line for line in lines[1:]))