commit 173c4bc8988f3a37faf3ce81c1adcafa72d4bb41
Author: josch <j.schauer@email.de>
Date:   Wed Dec 31 13:03:11 2014 +0100

    initial commit

diff --git a/buildinfo2snapshot.py b/buildinfo2snapshot.py
new file mode 100755
index 0000000..89948b7
--- /dev/null
+++ b/buildinfo2snapshot.py
@@ -0,0 +1,120 @@
+#!/usr/bin/python3
+#
+# Copyright 2014 Johannes Schauer
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+from debian import deb822
+import sys
+import urllib.request
+import json
+from datetime import datetime
+from collections import defaultdict
+import gzip
+import io
+
+snapshot_api = "http://snapshot.debian.org/mr/"
+
+# archive can be debian, debian-archive, debian-backports, debian-ports,
+# debian-security, debian-volatile
+archive = "debian"
+
+suite = "sid"
+area = "main"
+
+timestamps = defaultdict(list)
+
+reqpkgs = set()
+
+with open(sys.argv[1]) as f:
+    paragraph = list(deb822.Deb822.iter_paragraphs(f, use_apt_pkg=False))
+    if len(paragraph) != 1:
+        raise Exception("expected only one paragraph")
+    paragraph = paragraph[0]
+    arch = paragraph['Build-Architecture']
+    for pkg in deb822.PkgRelation.parse_relations(paragraph['Build-Environment']):
+        if len(pkg) != 1:
+            raise Exception("Build-Environment field must not have disjunctions")
+        pkg = pkg[0]
+        pkgarch = pkg['arch']
+        if pkgarch is None:
+            pkgarch = arch
+        pkgname = pkg['name']
+        if len(pkg['version']) != 2:
+            raise Exception("version must be a relation/number tuple")
+        if pkg['version'][0] != '=':
+            raise Exception("relationship must be '='")
+        pkgver = pkg['version'][1]
+        print(pkgname, pkgver, pkgarch)
+        reqpkgs.add((pkgname,pkgver,pkgarch))
+        json_data = urllib.request.urlopen("%s/binary/%s/"%(snapshot_api, pkgname))
+        if json_data.status != 200:
+            raise Exception("returned %d"%json_data.status)
+        json_data = json_data.read()
+        json_data = json.loads(json_data.decode('utf8'))
+        srcver = None
+        srcname = None
+        for res in json_data['result']:
+            if res['binary_version'] == pkgver:
+                srcver = res['version']
+                srcname = res['source']
+                break
+        if srcver is None or srcname is None:
+            raise Exception("cannot find source version for binary version")
+        json_data = urllib.request.urlopen("%s/package/%s/%s/binfiles/%s/%s?fileinfo=1"%(snapshot_api, srcname, srcver, pkgname, pkgver))
+        if json_data.status != 200:
+            raise Exception("returned %d"%json_data.status)
+        json_data = json_data.read()
+        json_data = json.loads(json_data.decode('utf8'))
+        pkghash = None
+        if len(json_data['result']) == 1:
+            if json_data['result'][0]['architecture'] != 'all':
+                Exception("excepted arch:all")
+            pkghash = json_data['result'][0]['hash']
+        else:
+            for res in json_data['result']:
+                if res['architecture'] == pkgarch:
+                    pkghash = res['hash']
+                    break
+        if pkghash is None:
+            raise Exception("cannot find architecture")
+        first_seen = [ph['first_seen'] for ph in json_data['fileinfo'][pkghash] if ph['archive_name'] == archive]
+        if len(first_seen) != 1:
+            raise Exception("more than one package with the same hash")
+        timestamps[datetime.strptime(first_seen[0], "%Y%m%dT%H%M%SZ")].append((pkgname,pkgver,pkgarch))
+
+newest = sorted(timestamps.keys())[-1]
+
+snapshot_timestamp = datetime.strftime(newest, "%Y%m%dT%H%M%SZ")
+
+# using gz instead of xz in case old snapshots have to be retrieved
+snapshot_url = "http://snapshot.debian.org/archive/%s/%s/dists/%s/%s/binary-%s/Packages.gz"%(archive, snapshot_timestamp, suite, area, arch)
+
+pkgdata = urllib.request.urlopen(snapshot_url)
+if pkgdata.status != 200:
+    raise Exception("returned %d"%pkgdata.status)
+pkgdata = io.BytesIO(pkgdata.read())
+pkgdata = gzip.GzipFile(fileobj=pkgdata)
+for pkg in deb822.Deb822.iter_paragraphs(pkgdata, use_apt_pkg=False):
+    pkgname = pkg['Package']
+    pkgver = pkg['Version']
+    if pkg['Architecture'] == 'all':
+        pkgarch = arch
+    else:
+        pkgarch = pkg['Architecture']
+    if (pkgname,pkgver,pkgarch) in reqpkgs:
+        reqpkgs.remove((pkgname,pkgver,pkgarch))
+
+if reqpkgs:
+    raise Exception("cannot find all package versions in found snapshot: %s"%reqpkgs)
+
+print("architecture = %s"%arch)
+print("mirror = http://snapshot.debian.org/archive/%s/%s/"%(archive, snapshot_timestamp))