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Previously (and still in cacheset), patterns where only allowed to
start with ? or ~, which ignores the fact that a pattern might just
as well start with a negation, such a !~nfoo.
Also, we ignored the --regex flag if it looked like this, which
was somewhat bad.
Let's change this all:
* If --regex is given, arguments are always interpreted as regex
* If it is a valid package wildcard (name or * characters), then
it will be interpreted as a wildcard - this set of characters is
free from meaningful overlap with patterns.
* Otherwise, the argument is interpreted as a pattern.
For a future version, we need to adapt parsing for cacheset and
list to use a common parser, to avoid differences in their
interpretation. Likely, this code will go into the pattern parser,
such that it generates a pattern given a valid fnmatch argument
for example.
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Reinstate * wildcards as they are safe to use, but do not allow any
other special characters such as ? or [].
Notably, ? would overlap with patterns, and [] might overlap with
future pattern extensions (alternative bracketing style), it's also
hard to explain.
Closes: #953531
LP: #1872200
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Packages from third-party sources do not always follow the established
patterns of more properly maintained archives. In that case it was a
driver package for a scanner&printer device which has only a minimum of
info attached, but also minimal non-installed packages do not include
sections, so we really shouldn't assume their availability.
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This is the first step. Next step will be to add warnings to
apt-get and then remove support there as well.
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This is pure syntactic sugar - ?narrow does not exist in the
abstract syntax.
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This matches any package that does not have versions.
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The ?exact-name pattern matches the name exactly, there is
no substring matching going on, or any regular expression
or fnmatch magic.
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This matches all packages where at least one of the versions
is marked essential; or well, whenver apt considers a package
essential.
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This matches all packages that have broken dependencies in the
installed version or the version selected for install.
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These two are mutually exclusive states of installed-ness. And
?installed package is fully unpacked and configured; a ?config-files
package only has config files left.
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These match packages that have no version in a repository, or
where an upgrade is available. Notably,
?and(?obsolete,?upgradable) == ?false
because an upgradable package is by definition not obsolete.
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These patterns allow you to identify automatically installed
packages, as well as automatically installed packages that are
no longer reachable from the manually installed ones.
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This implements the basic logic patterns:
?and ?false ?not ?or ?true
and the basic package patterns:
?architecture ?name ?x-name-fnmatch
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This adds a transformation from parse tree into a CacheFilter and
connects it with cachesets and the apt list command.
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