On 2013-03-07 20:04 +0100, Sven Joachim wrote:
> Package: gawk
> Version: 1:4.0.1+dfsg-2
> Severity: serious
>
> The Debian changelog for this version mentions:
>
> ,----
> | -Change Pre-Depends to Depends (OK now that base-files Pre-Depends: awk)
> `----
>
> This is not correct and needs to be reverted, since it means that gawk
> might be unpacked before its dependencies during upgrades. If the awk
> alternative is set to gawk, other packages which are unpacked in the
> same run and use awk in their pre{inst,rm} scripts which fail. This is
> not unlikely to happen in squeeze -> wheezy upgrades, since gawk in
> wheezy gained a new dependency on libsigsegv2.
Maybe it's not that likely to be triggered when using apt, since apt
appears to unpack libsigsegv2 before gawk, but here is a recipe showing
the problem starting in a squeeze chroot:
# apt-get install gawk
# sed -i 's/squeeze/wheezy/' /etc/apt/sources.list
# apt-get update
# aptitude download gawk libc6 libsigsegv2
# dpkg -i *.deb
Result:
,----
| Preparing to replace gawk 1:3.1.7.dfsg-5 (using
gawk_1%3a4.0.1+dfsg-2_i386.deb) ...
| Unpacking replacement gawk ...
| Preparing to replace libc6 2.11.3-4 (using libc6_2.13-38_i386.deb) ...
| Checking for services that may need to be restarted...awk: error while
loading shared libraries: libsigsegv.so.2: cannot open shared object file: No
such file or directory
| dpkg: error processing libc6_2.13-38_i386.deb (--install):
| subprocess new pre-installation script returned error exit status 127
| Selecting previously deselected package libsigsegv2.
| Unpacking libsigsegv2 (from libsigsegv2_2.9-4_i386.deb) ...
| Setting up libsigsegv2 (2.9-4) ...
| Setting up gawk (1:4.0.1+dfsg-2) ...
| Errors were encountered while processing:
| libc6_2.13-38_i386.deb
`----
Easily rectifiable, but if libsigsegv2 would depend on the _new_ libc6
the problem would be rather big.
> Both mawk and original-awk use Pre-Depends for that reason.
Cheers,
Sven
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