[Bug 610820] Re: Download size discrepancies
Loïc Minier
lool at dooz.org
Mon May 30 10:16:15 UTC 2011
maverick:
with 0.7.96.1ubuntu11:
1086308352 => 31305
after upgrading to 0.7.96.1ubuntu11.2:
922 => 4
1798 => 6
[...]
37918 => 4
43612 => 4
=> PASS
natty:
with 0.7.100.3ubuntu6:
0 => 32870
with 0.7.100.3ubuntu6.1:
0 => 137
940 => 4
[...]
39236 => 4
52916 => 4
=> PASS
** Tags added: verification-done-natty
** Tags added: verification-done
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https://bugs.launchpad.net/bugs/610820
Title:
Download size discrepancies
Status in Update Manager:
Invalid
Status in “python-apt” package in Ubuntu:
Fix Released
Status in “python-apt” source package in Maverick:
Fix Committed
Status in “python-apt” source package in Natty:
Fix Committed
Bug description:
python-apt returns incorrect values for some API functions on ARM due
to broken signed/unsigned and long/int integer conversions.
Impact:
bogus values (e.g. read from stack) for some function calls such as size of a package in cache; this causes user visible issues such as update-manager download sizes, or breaks linaro-image-tools when creating Linaro images (maverick host)
Fix:
This was fixed by using MkPyNumber(...) instead of Py_BuildValue("i", ...) or Py_BuildValue("k", ...)
TEST CASE:
run lp610820.py attached to this bug; if the output is a single entry in the size -> number of packages in cache hash, then python-apt is broken:
0 => 33936
instead, it should look like a long distribution of values in the form of:
922 => 4
1798 => 6
1800 => 4
1802 => 5
1828 => 6
1830 => 10
1832 => 7
Regression potential:
Could break the patches functions or could regress applications which relied on the bogus behavior; the builtin testsuite which is run during package build will help a bit with catching the first class of issues, and we'd likely want to fix the other issues by themselves. Testsuite coverage is likely not 100% perfect though
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