On 26/06/2022 17:33, Christian Franke wrote:
Use case: I ITP etckeeper (https://etckeeper.branchable.com/) which I frequently use on Debian. For fully automatic operation, it requires pre-install and post-install hooks, e.g:

/etc/preremove/0p_000_etckeeper_pre-install.sh
/etc/postinstall/zp_zzz_etckeeper_post-install.sh

This patch adds the missing functionality to run the pre-install hook. It is limited to /etc/preremove/0p_* because there is possibly no use case for /etc/preremove/zp_*.

Thanks.

I'm not sure what you mean by 'there is possibly no use case': That you don't have one currently, or that you've reasoned that there can't be one?

'class Perpetual0RemoveFindVisitor' is borrowed from postinstall.cc and modified. It still uses the ugly pre-C++11 hack to disable copy-ctor and operator=. Possible refactoring like merging all 3 mostly similar visitors into one (or if C++11 is now allowed, use lambda functions instead) are left for later.

Yeah, some refactoring would make this simpler and easier to understand. :)

I applied this patch.

Can you please also write a patch for [1] (source in [2]) to document this?

[1] https://cygwin.com/packaging-package-files.html#postinstall
[2] https://cygwin.com/git/?p=cygwin-htdocs.git;a=blob;f=packaging-package-files.html

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