1 files changed, 59 insertions, 0 deletions
diff --git a/doc/source/examples/missing-deps.py b/doc/source/examples/missing-deps.py
new file mode 100755
index 0000000..c3c56b8
--- /dev/null
+++ b/doc/source/examples/missing-deps.py
@@ -0,0 +1,59 @@
+#!/usr/bin/python3
+"""Check the archive for missing dependencies"""
+import apt_pkg
+
+
+def fmt_dep(dep):
+    """Format a Dependency object [of apt_pkg] as a string."""
+    ret = dep.target_pkg.name
+    if dep.target_ver:
+        ret += f" ({dep.comp_type} {dep.target_ver})"
+    return ret
+
+
+def check_version(pkgver):
+    """Check the version of the package"""
+    missing = []
+
+    for or_group in pkgver.depends_list.get(
+        "Pre-Depends", []
+    ) + pkgver.depends_list.get("Depends", []):
+        if not any(dep.all_targets() for dep in or_group):
+            # If none of the or-choices can be satisfied, add it to missing
+            missing.append(or_group)
+
+    if missing:
+        print("Package:", pkgver.parent_pkg.name)
+        print("Version:", pkgver.ver_str)
+        print("Missing:")
+        print(
+            ", ".join(" | ".join(fmt_dep(dep) for dep in or_group))
+            for or_group in missing
+        )
+        print()
+
+
+def main():
+    """The main function."""
+    apt_pkg.init_config()
+    apt_pkg.init_system()
+
+    cache = apt_pkg.Cache()
+
+    for pkg in sorted(cache.packages, key=lambda pkg: pkg.name):
+        # pkg is from a list of packages, sorted by name.
+        for version in pkg.version_list:
+            # Check every version
+            for pfile, _ in version.file_list:
+                if (
+                    pfile.origin == "Debian"
+                    and pfile.component == "main"
+                    and pfile.archive == "unstable"
+                ):
+                    # We only want packages from Debian unstable main.
+                    check_version(version)
+                    break
+
+
+if __name__ == "__main__":
+    main()