Merge branch 'master' into debian-r

[dak.git] / daklib / architecture.py

diff --git a/daklib/architecture.py b/daklib/architecture.py
new file mode 100644 (file)
index 0000000..8354de0
--- /dev/null
+++ b/daklib/architecture.py
@@ -0,0 +1,99 @@
+"""architecture matching
+
+@copyright: 2014, Ansgar Burchardt <ansgar@debian.org>
+@license: GPL-2+
+"""
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+def _load_table(path):
+    table = []
+    with open(path, 'r') as fh:
+        for line in fh:
+            if not line or line.startswith('#'):
+                continue
+            table.append(line.split())
+    return table
+
+_cached_cputable = None
+def _cputable():
+    global _cached_cputable
+    if _cached_cputable is None:
+        _cached_cputable = _load_table('/usr/share/dpkg/cputable')
+    return _cached_cputable
+
+_cached_arch2triplet = None
+_cached_triplet2arch = None
+def _triplettable():
+    global _cached_arch2triplet, _cached_triplet2arch
+    if _cached_arch2triplet is None or _cached_triplet2arch is None:
+        table = _load_table('/usr/share/dpkg/triplettable')
+        arch2triplet = {}
+        triplet2arch = {}
+        for row in table:
+            if '<cpu>' in row[0] or '<cpu>' in row[1]:
+                for cpu in _cputable():
+                    replaced_row = [ column.replace('<cpu>', cpu[0]) for column in row ]
+                    arch2triplet[replaced_row[1]] = replaced_row[0]
+                    triplet2arch[replaced_row[0]] = replaced_row[1]
+            else:
+                arch2triplet[row[1]] = row[0]
+                triplet2arch[row[0]] = row[1]
+        _cached_arch2triplet = arch2triplet
+        _cached_triplet2arch = triplet2arch
+    return _cached_triplet2arch, _cached_arch2triplet
+
+class InvalidArchitecture(Exception):
+    pass
+
+def Debian_arch_to_Debian_triplet(arch):
+    parts = arch.split('-')
+
+    # Handle architecture wildcards
+    if 'any' in parts:
+        if len(parts) == 3:
+            return parts
+        elif len(parts) == 2:
+            return 'any', parts[0], parts[1]
+        else:
+            return 'any', 'any', 'any'
+
+    if len(parts) == 2 and parts[0] == 'linux':
+        arch = parts[1]
+
+    triplet = _triplettable()[1].get(arch, None)
+    if triplet is None:
+        return None
+    return triplet.split('-', 2)
+
+def match_architecture(arch, wildcard):
+    # 'all' has no valid triplet
+    if arch == 'all' or wildcard == 'all':
+        return arch == wildcard
+    if wildcard is 'any' or arch == wildcard:
+        return True
+
+    triplet_arch = Debian_arch_to_Debian_triplet(arch)
+    triplet_wildcard = Debian_arch_to_Debian_triplet(wildcard)
+
+    if triplet_arch is None or len(triplet_arch) != 3:
+        raise InvalidArchitecture('{0} is not a valid architecture name'.format(arch))
+    if triplet_wildcard is None or len(triplet_wildcard) != 3:
+        raise InvalidArchitecture('{0} is not a valid architecture name or wildcard'.format(wildcard))
+
+    for i in range(0,3):
+        if triplet_arch[i] != triplet_wildcard[i] and triplet_wildcard[i] != 'any':
+            return False
+    return True