Based on Steve’s explanation:
Russ Allbery wrote:
> <p>
> The <tt>Depends</tt> field should also be used if the
> <prgn>postinst</prgn> or <prgn>prerm</prgn> scripts
> require the depended-on package to be unpacked or
> configured in order to run, or if the dependend-on package
> is desirable for cleanup done by <prgn>postrm</prgn>.
Desirable is too weak. I think this case is complicated enough to
deserve its own paragraph.
The <tt>Depends</tt> field should also be used if the
<prgn>postinst</prgn> or <prgn>prerm</prgn> scripts
require the depended-on package to be unpacked or
[as before ...]
previous upgrade of the dependency failed.
The <tt>Depends</tt> field should also be used if an
operation that ought to be done in <prgn>postrm</prgn>
requires the depended-on package.
> In the case of <prgn>postrm</prgn>,
> there are no guarantees, but the depended-on package is
> more likely to be available
This does not
guarantee that the depended-on package will be available
when <prgn>postrm</prgn> is run, but it makes it more
likely.
> The <prgn>postrm</prgn> script must cleanly skip actions
> that require a dependency if that dependency isn't
> available.
The <prgn>postrm</prgn> script must gracefully
skip actions that require a dependency if that dependency
isn't available. The depended-on package should ensure
that the corresponding state is cleaned up when <em>it</em>
is purged.
(with a pointer to the example in #mscriptsinstact)
Sensible?
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