Keep source network profiles without static addresses

Dropping every NetworkManager profile and ifcfg file also removed
settings that confignet does not recreate from confluent attributes,
such as bonds, DHCP profiles, MTU or the InfiniBand transport mode. Only
drop the profiles that carry static addresses of the source.

imgutil/imgutil

@@ -160,9 +160,7 @@ CAPTURE_EMPTY_DIRS = (
 # Directories where daemons expect the subdirectories to exist, only the
 # files are dropped
 CAPTURE_DIRS_ONLY = ('/var/log', '/var/cache/apt')
-# Individual files, may be globs. The network profiles of the source would
-# keep its addresses on interfaces confignet does not configure, deployment
-# writes the node's own (as with the netplan files masked in capture_fs)
+# Individual files, may be globs
 CAPTURE_DROP_FILES = (
     '/var/lib/systemd/random-seed', '/var/lib/rsyslog/imjournal.state',
     '/var/lib/NetworkManager/*.lease', '/var/lib/dhclient/*.lease*',
@@ -173,9 +171,17 @@ CAPTURE_DROP_FILES = (
     # identity and stable privacy IPv6 addresses
     '/var/lib/dhcpcd/*.lease*', '/var/lib/dhcpcd/duid', '/var/lib/dhcpcd/secret',
     '/var/lib/NetworkManager/secret_key',
-    '/root/.*_history', '/root/.lesshst', '/root/.viminfo',
-    '/etc/NetworkManager/system-connections/*',
-    '/etc/sysconfig/network-scripts/ifcfg-*')
+    '/root/.*_history', '/root/.lesshst', '/root/.viminfo')
+# Network profiles with static addresses of the source, which would come up
+# on interfaces confignet does not configure (deployment writes the node's
+# own, as with the netplan files masked in capture_fs). Profiles without
+# addresses, such as bonds, MTU or InfiniBand mode settings, are kept.
+CAPTURE_DROP_STATIC = {
+    '/etc/NetworkManager/system-connections/*':
+        re.compile(r'^\s*(address\d*|addresses|method\s*=\s*manual)\b', re.M),
+    '/etc/sysconfig/network-scripts/ifcfg-*':
+        re.compile(r'^\s*(IPADDR\d*|IPV6ADDR(_SECONDARIES)?)\s*=', re.M),
+}
 # Matches of the globs above to keep
 CAPTURE_KEEP_FILES = ('/etc/sysconfig/network-scripts/ifcfg-lo',)
 
@@ -219,16 +225,24 @@ def get_capture_excludes(mdir):
                         excludes.append(entry.path)
                 elif entry.path not in emptied:
                     pending.append(entry.path)
-    for dropglob in CAPTURE_DROP_FILES:
+    keep = [capin_path(x) for x in CAPTURE_KEEP_FILES]
+    for dropglob in CAPTURE_DROP_FILES + tuple(CAPTURE_DROP_STATIC):
         top = capin_path(dropglob)
         if top is None:
             continue
-        keep = [capin_path(x) for x in CAPTURE_KEEP_FILES]
         for dropfile in glob.glob(top):
             if dropfile in keep:
                 continue
-            if (os.path.islink(dropfile) or not os.path.isdir(dropfile)) and droppable(dropfile):
-                excludes.append(dropfile)
+            if (os.path.isdir(dropfile) and not os.path.islink(dropfile)) or not droppable(dropfile):
+                continue
+            if dropglob in CAPTURE_DROP_STATIC:
+                try:
+                    with open(dropfile, errors='replace') as profilein:
+                        if not CAPTURE_DROP_STATIC[dropglob].search(profilein.read()):
+                            continue
+                except OSError:
+                    continue
+            excludes.append(dropfile)
     return excludes
 
 def capture_fs(args):