1 files changed, 58 insertions, 0 deletions
diff --git a/doc/examples/build-deps.py b/doc/examples/build-deps.py
new file mode 100755
index 0000000..714d1c4
--- /dev/null
+++ b/doc/examples/build-deps.py
@@ -0,0 +1,58 @@
+#!/usr/bin/python3
+# this is a example how to access the build dependencies of a package
+
+import sys
+
+import apt_pkg
+
+import apt
+
+# main
+cache = apt.Cache()
+srcrecords = apt_pkg.SourceRecords()
+
+# base package that we use for build-depends calculation
+if len(sys.argv) < 2:
+    print("need a package name as argument")
+    sys.exit(1)
+try:
+    pkg = base = cache[sys.argv[1]]
+except KeyError:
+    print("No package %s found" % sys.argv[1])
+    sys.exit(1)
+all_build_depends = set()
+
+# get the build depdends for the package itself
+srcpkg_name = base.candidate.source_name
+print("srcpkg_name: %s " % srcpkg_name)
+if not srcpkg_name:
+    print("Can't find source package for '%s'" % pkg.name)
+srcrec = srcrecords.lookup(srcpkg_name)
+if srcrec:
+    print("Files:")
+    print(srcrecords.files)
+    bd = srcrecords.build_depends
+    print("build-depends of the package: %s " % bd)
+    for b in bd:
+        all_build_depends.add(b[0])
+
+# calculate the build depends for all dependencies
+depends = base.candidate.dependencies
+for or_dep in depends:
+    for dep in or_dep.or_dependencies:
+        pkg = cache[dep.name]
+        srcpkg_name = pkg.candidate.source_name
+        if not srcpkg_name:
+            print("Can't find source package for '%s'" % pkg.name)
+            continue
+        srcrec = srcrecords.lookup(srcpkg_name)
+        if srcrec:
+            # print srcrecords.package
+            # print srcrecords.binaries
+            bd = srcrecords.build_depends
+            # print "%s: %s " % (srcpkg_name, bd)
+            for b in bd:
+                all_build_depends.add(b[0])
+
+
+print("\n".join(all_build_depends))