02-23-2009
On the two most prevalent package management systems for Linux (deb and rpm) that information isn't really accessible, but depends on what the pre-/postinstall scripts embedded in the package do and how the maintainer wrote those.
As for downtime: a typical Apache upgrade for me never resulted in more that 30 seconds downtime (which was on a P90, long ago). Since an upgrade should be done between business hours anyways (in case somethings goes terribly wrong) a blip of about 5 minutes shouldn't do too much of an impact on business. If it would I suggest investing in redundancy and update only one node at a time.
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LEARN ABOUT NETBSD
build-rdeps
BUILD-RDEPS(1) BUILD-RDEPS(1)
NAME
build-rdeps - find packages that depend on a specific package to build (reverse build depends)
SYNOPSIS
build-rdeps package
DESCRIPTION
build-rdeps searches for all packages that build-depend on the specified package.
OPTIONS
-u, --update
Run apt-get update before searching for build-depends.
-s, --sudo
Use sudo when running apt-get update. Has no effect if -u is omitted.
--distribution
Select another distribution, which is searched for build-depends.
--only-main
Ignore contrib and non-free
--exclude-component
Ignore the given component (e.g. main, contrib, non-free).
--origin
Restrict the search to only the specified origin (such as "Debian").
-m, --print-maintainer
Print the value of the maintainer field for each package.
-d, --debug
Run the debug mode
--help
Show the usage information.
--version
Show the version information.
REQUIREMENTS
The tool requires apt Sources files to be around for the checked components. In the default case this means that in /var/lib/apt/lists
files need to be around for main, contrib and non-free.
In practice this means one needs to add one deb-src line for each component, e.g.
deb-src http://<mirror>/debian <dist> main contrib non-free
and run apt-get update afterwards or use the update option of this tool.
LICENSE
This code is copyright by Patrick Schoenfeld <schoenfeld@debian.org>, all rights reserved. This program comes with ABSOLUTELEY NO
WARRANTY. You are free to redistribute this code under the terms of the GNU General Public License, version 2 or later.
AUTHOR
Patrick Schoenfeld <schoenfeld@debian.org>
Debian Utilities 2013-12-23 BUILD-RDEPS(1)