Add import signatures management command

This allow importing signatures from a provided gpg keyring, such as
that produced by the generate_keyring management command that already
exists. These will eventually be used for producing stats involving
developer signing keys and their certification by master keys.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 104 insertions, 0 deletions

diff --git a/devel/management/commands/import_signatures.py b/devel/management/commands/import_signatures.py
new file mode 100644
index 0000000..8a4ce87
--- /dev/null
+++ b/devel/management/commands/import_signatures.py
@@ -0,0 +1,104 @@
+# -*- coding: utf-8 -*-
+"""
+import_signatures command
+
+Import signatures from a given GPG keyring.
+
+Usage: ./manage.py generate_keyring <keyring_path>
+"""
+
+from datetime import datetime
+import logging
+import subprocess
+import sys
+
+from django.core.management.base import BaseCommand, CommandError
+from django.db import transaction
+
+from devel.models import PGPSignature
+
+logging.basicConfig(
+    level=logging.INFO,
+    format='%(asctime)s -> %(levelname)s: %(message)s',
+    datefmt='%Y-%m-%d %H:%M:%S',
+    stream=sys.stderr)
+logger = logging.getLogger()
+
+class Command(BaseCommand):
+    args = "<keyring_path>"
+    help = "Import signatures from a given GPG keyring."
+
+    def handle(self, *args, **options):
+        v = int(options.get('verbosity', None))
+        if v == 0:
+            logger.level = logging.ERROR
+        elif v == 1:
+            logger.level = logging.INFO
+        elif v == 2:
+            logger.level = logging.DEBUG
+
+        if len(args) < 1:
+            raise CommandError("keyring_path must be provided")
+
+        import_signatures(args[0])
+
+def parse_sigdata(data):
+    nodes = {}
+    edges = []
+    current_pubkey = None
+
+    # parse all of the output from our successful GPG command
+    logger.info("parsing command output")
+    for line in data.split('\n'):
+        parts = line.split(':')
+        if parts[0] == 'pub':
+            current_pubkey = parts[4]
+            nodes[current_pubkey] = None
+        if parts[0] == 'uid':
+            uid = parts[9]
+            # only set uid if this is the first one encountered
+            if nodes[current_pubkey] is None:
+                nodes[current_pubkey] = uid
+        if parts[0] == 'sig':
+            created = datetime.utcfromtimestamp(int(parts[5]))
+            expires = None
+            if parts[6]:
+                expires = datetime.utcfromtimestamp(int(parts[6]))
+            valid = parts[1] != '-'
+            edge = (parts[4], current_pubkey, created, expires, valid)
+            edges.append(edge)
+
+    return nodes, edges
+
+
+def import_signatures(keyring):
+    gpg_cmd = ["gpg", "--no-default-keyring", "--keyring", keyring,
+            "--list-sigs", "--with-colons", "--fixed-list-mode"]
+    logger.info("running command: %r", gpg_cmd)
+    proc = subprocess.Popen(gpg_cmd, stdout=subprocess.PIPE)
+    outdata, errdata = proc.communicate()
+    if proc.returncode != 0:
+        logger.error(errdata)
+        raise subprocess.CalledProcessError(proc.returncode, gpg_cmd)
+
+    nodes, edges = parse_sigdata(outdata)
+
+    # now prune the data down to what we actually want.
+    # prune edges not in nodes, remove duplicates, and self-sigs
+    pruned_edges = set(edge for edge in edges
+            if edge[0] in nodes and edge[0] != edge[1])
+
+    logger.info("creating or finding %d signatures", len(pruned_edges))
+    created_ct = 0
+    with transaction.commit_on_success():
+        for edge in pruned_edges:
+            _, created = PGPSignature.objects.get_or_create(
+                    signer=edge[0], signee=edge[1],
+                    created=edge[2], expires=edge[3],
+                    defaults={ 'valid': edge[4] })
+            if created:
+                created_ct += 1
+
+    logger.info("created %d signatures", created_ct)
+
+# vim: set ts=4 sw=4 et: