If there is a regression in "present-and-installable" constraints (on
non-break architectures), then discard the item even if the nuninst
counters have improved.
Signed-off-by: Niels Thykier <niels@thykier.net>
Replace a "if" with an unconditionally false condition with a negative
assert of the "correct" condition. The bug has been present for 2½
years with no known adverse effects.
Signed-off-by: Niels Thykier <niels@thykier.net>
For (non-hint) migrations, split the set of affected into two
parts; one for reverse dependencies and one "negative dependencies"
(e.g. Conflicts).
If there are only regressions in the nuninst after checking the first
set, then there is no reason to continue with the second set (as
"negative dependencies" can only make it worse at that point).
Signed-off-by: Niels Thykier <niels@thykier.net>
Ideally we would reject all items with known unsatisfiable
dependencies as they would not be installable in testing. However,
there are a few known corner cases where we still want to migrate them
(notably when they are already broken in testing).
This commit is an attempt to weed out some of the "obviously" broken
items that will not successfully migrate.
Signed-off-by: Niels Thykier <niels@thykier.net>
In the next commit, the binary packages will be turned into
namedtuples and will become immutable objects.
Signed-off-by: Niels Thykier <niels@thykier.net>
In an architecture only migration, we currently see two notes for
every arch:all packages:
* Ignoring "new" arch:all package
* Ignoring "removal" of arch:all package
But a closer look at the situation is that the arch:all packages is
generally the same in both testing and the source suite.
This commit removes these notes when the arch:all is the same in both
suites.
Signed-off-by: Niels Thykier <niels@thykier.net>
In 203466b, we stopped migrating cruft items if they were not in
testing already. However, if the migration failed we would still
attempt to undo it from testing, which (unsurprisingly) does not work
very well.
Signed-off-by: Niels Thykier <niels@thykier.net>
There was an implicit assumption in Britney that was violated recently
(presumbly in 12d9ae8). This assumption is that a source package will
reference the *latest* version of an arch:all package; even if that
version is not built by that source (version).
Image the following packages:
* p-all/1 and p-all/2 are arch:all packages.
- p-all/1 is generally superseded by p-all/2 except it has not
been removed yet (regardless of why that happens).
* src-a/2 builds p-all/2.
When Britney loads the packages (assuming packages are sorted[1]):
* p-all/1 is read and associated with src-a/2 (despite not being
built from that source)
* p-all/2 is read afterwards. It would replace p-all/1 and be
assoicated with src-a/2 as well.
- Prior to 12d9ae8, the assoication would be "pkg, arch" and
therefore the same.
- In 12d9ae8a and after, the association would include version
and both would be associated at the same time.
* Since p-all/1 is discarded, it is never added to the
installability tester (nor the solver). It then promptly throws
an exception when asked to deal with a package it believe does
not exist.
- This can trivially be solved by removing the association
between p-all/1 and src-a/2 when p-all/2 is read.
So far so good. Unfortunately, this adds another another problem!
When Britney migrates a binNMU, she currently removes *all* binary
packages on that architecture - *including* the arch:all packages.
This works out in the end because the arch:all packages be re-added
since they associated with the source package.
At first glance, this appears to be a non-issue until you add
hijacking to the mix. This is *exactly* the case behind #709460.
However, now we end up in a situation where the arch:all package is
removed during binNMU and not re-added (because the arch:all package
is not associated with *that* source any more).
This commit fixes all of the above by:
1) Correctly disassociating superseded arch:all packages from their
source packages
2) Falsely associating the "new" arch:all package to the source that
provided the superseded arch:all package (to avoid issues with
binNMUs and hijacked packages).
- This should probably be undone at some point when Britney does
not need this "hack" any more.
This fix is currently relying on the packages being sorted. But so
did the fix for #709460 (see [1] again). It might be prudent to fix
that as well (or at least reject the packages file rather than produce
"random" results).
[1] Which is another assumption we have been relying and that is
currently satisfied.
Signed-off-by: Niels Thykier <niels@thykier.net>
* A package being removed is *not* affected
- It will just be filtered out later in "check_packages"
* Since all transitive reverse dependencies will be added to
"affected" at the end of the method, there is no reason to
find the immediate set of reverse dependencies of a package
if the package is added itself as well.
Signed-off-by: Niels Thykier <niels@thykier.net>
We asserted that a list of packages was a subset of the "affected"
set. This was a given, since the list was seeded *only* with packages
from affected (and only if their installability changed).
Signed-off-by: Niels Thykier <niels@thykier.net>
Adds a --components command line argument (and corresponding config file
option). If specified, package info is expected to be in the usual Debian
mirror layout, ie:
testing/source/Sources
testing/binary-${ARCH}/Packages
(nthykier: Squashed, rebased and did some porting to Python3)
Signed-off-by: Niels Thykier <niels@thykier.net>
A package can have old cruft no longer in testing, which can't
migrate because it depends on old libraries or packages that
aren't in testing anymore, preventing migration.
There's no point in trying to migrate old cruft that has already
been removed in testing anyway, so don't do that.
Signed-off-by: Emilio Pozuelo Monfort <pochu@debian.org>
Signed-off-by: Niels Thykier <niels@thykier.net>
The "include_hijacked" parameter of "_compute_groups" was always
false, so there was little point in having it.
Signed-off-by: Niels Thykier <niels@thykier.net>
Niels Thykier
Anthony Towns
Emilio Pozuelo Monfort