1 files changed, 74 insertions, 0 deletions
diff --git a/doc/examples/build-deps-old.py b/doc/examples/build-deps-old.py
new file mode 100755
index 0000000..71a081e
--- /dev/null
+++ b/doc/examples/build-deps-old.py
@@ -0,0 +1,74 @@
+#!/usr/bin/python3
+# this is a example how to access the build dependencies of a package
+
+import sys
+
+import apt_pkg
+
+
+def get_source_pkg(pkg, records, depcache):
+    """get the source package name of a given package"""
+    version = depcache.get_candidate_ver(pkg)
+    if not version:
+        return None
+    file, index = version.file_list.pop(0)
+    records.lookup((file, index))
+    if records.source_pkg != "":
+        srcpkg = records.source_pkg
+    else:
+        srcpkg = pkg.name
+    return srcpkg
+
+
+# main
+apt_pkg.init()
+cache = apt_pkg.Cache()
+depcache = apt_pkg.DepCache(cache)
+depcache.init()
+records = apt_pkg.PackageRecords(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 = get_source_pkg(base, records, depcache)
+print("srcpkg_name: %s " % srcpkg_name)
+if not srcpkg_name:
+    print("Can't find source package for '%s'" % pkg.mame)
+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 = depcache.get_candidate_ver(base).depends_list
+for dep in depends["Depends"]:  # FIXME: do we need to consider PreDepends?
+    pkg = dep[0].target_pkg
+    srcpkg_name = get_source_pkg(pkg, records, depcache)
+    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))