If I'm not mistaken, there is no standard way of getting the value of just a single arbitrary substitution variable, such as ${source:Upstream-Version}. Consequently, countless of debian/rules and other scripts reinvent the wheel using dpkg-parsechangelog together with slightly varying sed programs, which sometimes give an incorrect result.
So I thought that it might be a good idea to implement a general-case dpkg-substvars. Turns out somebody already did that - seven years ago. However, http://bugs.debian.org/66336 was tagged wontfix, probably because it tried to make it possible to use substitution variables in package names. But if we forget about variable package names, wouldn't dpkg-substvars be a good idea? -- Magnus Holmgren [EMAIL PROTECTED] (No Cc of list mail needed, thanks)
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