package: postfix-cdb version: 3.11.0-4 severity: serious justification: i think this imust be some kind of policy violation, and it makes other mta break
Hi, postfix-cdb's postrm can fail if postfix has been removed first. This is because postfix-cdb's prerm tries to run /usr/share/postfix/postinst.functions from postfix, but postfix can already have been removed in some circumtances: For example, when postfix is to be replaced by another mta, apt can decide to remove postfix before postfix-cdb A minimal reproducer is: # in a container - will break your system! apt install -y logcheck postfix # choose no configuration apt install -y dma # or any other mta (logcheck can be, i think, any package that depends on mail-transport-agent: i dont know exactly why, but when such a package is installed, apt(?) will choose to do the postfix removal before the postfix-cdb removal - this happens quite reliably in my tests. i ran into this testing all mtas for logcheck: https://salsa.debian.org/rpil2/logcheck/-/jobs/9480217 & https://salsa.debian.org/rpil2/logcheck/-/tree/test-systemd-mail --- but I imagine anyone changing mta might hit this). The errors follow - you can see that postfix is removed before postfix-cdb is removed, despite the dependencies I tihnk you could fix this by making postfix-cdb's prerm check for the postfix.functions file before trying to use it: seems sensible anyway Removing postfix-lmdb (3.11.0-4) ... Removing lmdb map entry from /etc/postfix/dynamicmaps.cf dpkg: postfix: dependency problems, but removing anyway as you requested: postfix-cdb depends on postfix (= 3.11.0-4). mime-construct depends on default-mta | mail-transport-agent; however: Package default-mta is not installed. Package mail-transport-agent is not installed. Package postfix which provides mail-transport-agent is to be removed. logcheck depends on default-mta | mail-transport-agent; however: Package default-mta is not installed. Package mail-transport-agent is not installed. Package postfix which provides mail-transport-agent is to be removed. Removing postfix (3.11.0-4) ... Selecting previously unselected package dma. (Reading database ... 17354 files and directories currently installed.) Preparing to unpack .../archives/dma_0.14-1_amd64.deb ... Unpacking dma (0.14-1) ... (Reading database ... 17376 files and directories currently installed.) Removing postfix-cdb (3.11.0-4) ... /var/lib/dpkg/info/postfix-cdb.prerm: 3: .: cannot open /usr/share/postfix/postinst.functions: No such file dpkg: error processing package postfix-cdb (--remove): old postfix-cdb package prerm maintainer script subprocess failed with exit status 2 dpkg: too many errors, stopping /var/lib/dpkg/info/postfix-cdb.postinst: 3: .: cannot open /usr/share/postfix/postinst.functions: No such file dpkg: error while cleaning up: old postfix-cdb package postinst maintainer script subprocess failed with exit status 2 Errors were encountered while processing: postfix-cdb Processing was halted because there were too many errors.
