Package: dpkg
Version: 1.17.27

When installing packages which *only* have files in /usr, I generally
try to leave / read-only.  With the recent release of `dpkg` though this
has become problematic.

>From the error message, during unpacking `dpkg` is trying to create a
file/directory as /usr.dpkg-tmp, which fails if / is read-only.  This
could actually cause some problems.  Notably if `dpkg` is doing this to
check whether the filesystem has sufficient free space, this check *WILL*
fail since / and /usr could well be different filesystems.  This could
also cause trouble if /usr.dpkg-tmp is large and / has limited free
space.

I'm unsure how to rate the severity of this issue.  This is distinctly
annoying and can trigger warning flags, but I suppose in many cases it
won't cause problems for people.  Folks who always remount / read-write
when upgrading packages may well not notice, but those of use who pay a
bit more attention do notice.


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