add iso-deb-size-compare

diff --git a/iso-deb-size-compare b/iso-deb-size-compare
new file mode 100755 (executable)
index 0000000..c98bb28
--- /dev/null
+++ b/iso-deb-size-compare
@@ -0,0 +1,68 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+import subprocess, sys
+
+def deb_size_map(iso_path):
+    map = {} # package -> (version, size)
+    isoinfo = subprocess.Popen(['isoinfo', '-lR', '-i', iso_path],
+       stdout=subprocess.PIPE)
+    out = isoinfo.communicate()[0]
+    assert isoinfo.returncode == 0
+
+    for l in out.splitlines():
+        l = l.strip()
+        if not l.endswith('.deb'):
+            continue
+
+        fields = l.split()
+        size = int(fields[4])
+        fname = fields[11]
+
+        (pkg, version, _) = fname.split('_')
+        map[pkg] = (version, size)
+
+    return map
+
+#
+# main
+#    
+
+if len(sys.argv) != 3:
+    print >> sys.stderr, 'Usage: %s <old iso> <new iso>' % sys.argv[0]
+    sys.exit(1)
+
+old_map = deb_size_map(sys.argv[1])
+new_map = deb_size_map(sys.argv[2])
+
+print '== Removed packages =='
+sum = 0
+for p, (v, s) in old_map.iteritems():
+    if p not in new_map:
+        print '%s (%.1f MB)' % (p, s / 1000000.)
+        sum += s
+print 'TOTAL: -%.1f MB' % (sum/1000000.)
+
+sum = 0
+print '\n== Added packages =='
+for p, (v, s) in new_map.iteritems():
+    if p not in old_map:
+        print '%s (%.1f MB)' % (p, s / 1000000.)
+        sum += s
+print 'TOTAL: +%.1f MB' % (sum/1000000.)
+
+print '\n== Changed packages =='
+sum = 0
+for p, (v, s) in old_map.iteritems():
+    if p not in new_map:
+        continue
+
+    new_s = new_map[p][1]
+    sum += new_s - s
+
+    # only show differences > 100 kB to filter out noise
+    if new_s - s > 100000:
+        print '%s (Δ %.1f MB - %s: %.1f MB   %s: %.1f MB)' % (
+        p, (new_s-s)/1000000., v, s/1000000., new_map[p][0], new_s/1000000.)
+
+print 'TOTAL difference: %.1f MB' % (sum/1000000.)