networkcache: use multiarch to support arm

Use `gcc -dumpmachine` instead of `platform.machine()` to discriminate
architecture

slapos/cli/cache.py

@@ -27,7 +27,6 @@
 #
 ##############################################################################
 
-import ast
 import hashlib
 import json
 import re
@@ -36,7 +35,6 @@ import sys
 import prettytable
 
 from slapos.grid import networkcache
-from slapos.grid.distribution import distribution_tuple
 from slapos.cli.config import ConfigCommand
 from slapos.util import str2bytes
 
@@ -77,8 +75,10 @@ def looks_like_md5(s):
     return re.match('[0-9a-f]{32}', s)
 
 
-def ostuple(info_dict):
-    return (info_dict['machine'],) + ast.literal_eval(info_dict['os'])
+def infotuple(entry):
+    info_dict = networkcache.loadJsonEntry(entry[0])
+    return info_dict['multiarch'], info_dict['os'], entry[1]
+
 
 def do_lookup(logger, cache_dir, cache_url, signature_certificate_list,
               software_url):
@@ -99,12 +99,13 @@ def do_lookup(logger, cache_dir, cache_url, signature_certificate_list,
         logger.info('Object found in cache, but has no binary entries.')
         return 0
 
-    ostable = sorted(ostuple(json.loads(entry[0])) for entry in entries)
-    pt = prettytable.PrettyTable(['machine', 'distribution', 'version', 'id', 'compatible?'])
+    pt = prettytable.PrettyTable(['multiarch', 'distribution', 'version', 'id', 'compatible?'])
+    machine_info = networkcache.machine_info_tuple()
 
-    for os in ostable:
-        compatible = 'yes' if networkcache.is_compatible(os[0], os[1:]) else 'no'
-        pt.add_row([os[0], os[1], os[2], os[3], compatible])
+    for multiarch, os, verified in sorted(map(infotuple, entries)):
+        row = [multiarch] + os
+        row.append('yes' if networkcache.is_compatible(machine_info, (multiarch, os)) else 'no')
+        pt.add_row(row)
 
     meta = json.loads(entries[0][0])
     logger.info('Software URL: %s', meta['software_url'])

slapos/grid/networkcache.py

@@ -17,6 +17,7 @@ import ast
 import json
 import platform
 import shutil
+import subprocess
 import traceback
 
 from slapos.grid.distribution import os_matches, distribution_tuple
@@ -53,8 +54,26 @@ def fallback_call(function):
     return wrapper
 
 
-def is_compatible(machine, os):
-    return machine == platform.machine() and os_matches(os, distribution_tuple())
+def multiarch():
+    return subprocess.check_output(
+        ('gcc', '-dumpmachine'), universal_newlines=True,).rstrip()
+
+
+def machine_info_tuple():
+    return multiarch(), distribution_tuple()
+
+
+def is_compatible(machine_info_tuple, required_info_tuple):
+    return machine_info_tuple[0] == required_info_tuple[0] \
+        and os_matches(required_info_tuple[1], machine_info_tuple[1])
+
+
+def loadJsonEntry(jentry):
+    entry = json.loads(jentry)
+    if 'multiarch' not in entry and entry['machine'] == 'x86_64': # BBB
+        entry['multiarch'] = 'x86_64-linux-gnu'
+        entry['os'] = list(ast.literal_eval(entry['os']))
+    return entry
 
 
 def download_entry_list(cache_url, dir_url, key, logger,
@@ -92,22 +111,15 @@ def download_network_cached(cache_url, dir_url, software_url, software_root,
     logger.info('Downloading %s binary from network cache.' % software_url)
     try:
         file_descriptor = None
-        json_entry_list = nc.select_generic(key)
-        for entry in json_entry_list:
-            json_information, _ = entry
+        machine_info = machine_info_tuple()
+        for entry, _ in nc.select_generic(key):
             try:
-                tags = json.loads(json_information)
-                if not is_compatible(tags.get('machine'), ast.literal_eval(tags.get('os'))):
-                    continue
-                if tags.get('software_url') != software_url:
-                    continue
-                if tags.get('software_root') != software_root:
-                    continue
-                sha512 = tags.get('sha512')
-                file_descriptor = nc.download(sha512)
+                tags = loadJsonEntry(entry)
+                if is_compatible(machine_info, (tags['multiarch'], tags['os'])):
+                    file_descriptor = nc.download(tags['sha512'])
                     break
             except Exception:
-                continue
+                pass
         if file_descriptor is not None:
             f = open(path, 'w+b')
             try:
@@ -143,8 +155,8 @@ def upload_network_cached(software_root, software_url, cached_key,
       urlmd5="urlmd5",
       software_url=software_url,
       software_root=software_root,
-      machine=platform.machine(),
-      os=str(distribution_tuple())
+      multiarch=multiarch(),
+      os=distribution_tuple(),
     )
 
     f = open(path, 'r')

slapos/tests/test_cli.py

@@ -103,13 +103,13 @@ class TestCliCache(CliMixin):
     self.logger.info.assert_any_call('Software URL: %s', 
             u'https://lab.nexedi.com/nexedi/slapos/raw/1.0.102/software/slaprunner/software.cfg')
     self.logger.info.assert_any_call('MD5:          %s', 'cccdc51a07e8c575c880f2d70dd4d458')
-    self.logger.info.assert_any_call(u'--------------------------------------------------')
-    self.logger.info.assert_any_call(u' machine distribution version    id   compatible? ')
-    self.logger.info.assert_any_call(u'--------------------------------------------------')
-    self.logger.info.assert_any_call(u'  x86_64 CentOS Linux 7.5.1804  Core       no     ')
-    self.logger.info.assert_any_call(u'  x86_64    Ubuntu     18.04   bionic      no     ')
+    self.logger.info.assert_any_call(u'-----------------------------------------------------------')
+    self.logger.info.assert_any_call(u'    multiarch     distribution version    id   compatible? ')
+    self.logger.info.assert_any_call(u'-----------------------------------------------------------')
+    self.logger.info.assert_any_call(u' x86_64-linux-gnu CentOS Linux 7.5.1804  Core       no     ')
+    self.logger.info.assert_any_call(u' x86_64-linux-gnu    Ubuntu     18.04   bionic      no     ')
     # Omit some lines as it may fail depending of the OS
-    self.logger.info.assert_any_call(u'--------------------------------------------------')
+    self.logger.info.assert_any_call(u'-----------------------------------------------------------')
 
   def test_uncached_binary(self):
     self.assertEqual(10, cache_do_lookup(