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Only "recent" versions of dpkg support stdin for merge instead of a
file, so as a quick fix we delay calling it until we really need it
which fixes most of the problem already.
Checking for a specific dpkg version here is deemed too much work, just
like using a temporary file here and depends a too high requirement for
this minor usecase. After all, it didn't work at all before, so we break
nobody here and can fix it if someone complains (with a patch).
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Usually they don't provide a lot in terms of what they test, but they
help in covering many lines from strictly anecdotal commands (stats,
moo) and error messages, so that stuff which really needs to be tested,
but isn't is better visible in coverage reports.
Git-Dch: Ignore
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dpkg wants to know about a package before it can be put on hold, so we
have to at least hint about its existance in the available file it
"maintaince" to know about such stuff. The simple thing would probably
be to just feed all Packages files into dpkg as well, but what would be
the point really? Exactly, so we take a shortcut here and just create
dummies in the available file if we need to which isn't going to be that
common as usually you are holding packages back and not off.
Who would have thought that a simple feature like setting a package on
hold requires more than 200 lines of codeā¦ at least with the testcase it
is now explicitly tested code.
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