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Bug#1009866: rsyslog-pgsql: postinst script fails with non-zero exit at dbc_postinst_cleanup

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Am 19.04.22 um 16:15 schrieb Wilko Meyer:
> Package: rsyslog-pgsql
> Version: 8.2102.0-2
> Severity: minor
> 
> Dear Maintainer,
> 
> The postinst script fails under certain conditions due to the lack of
> error handling in dbc_postinst_cleanup with a non-zero exit code:
> 
> Output with `set -x` set:
> 
> #+BEGIN_SRC
> 
> + IFS=
> + printf %s\n RESET rsyslog-pgsql/app-password-confirm
> + IFS=
> 
> + read -r _db_internal_line
> + IFS=
> 
> + RET=10 rsyslog-pgsql/app-password-confirm doesn't exist
> + return 10
> + true
> + db_fset rsyslog-pgsql/app-password-confirm seen false
> + _db_cmd FSET rsyslog-pgsql/app-password-confirm seen false
> + _db_internal_IFS=
> 
> + IFS=
> + printf %s\n FSET rsyslog-pgsql/app-password-confirm seen false
> + IFS=
> 
> + read -r _db_internal_line
> + IFS=
> 
> + RET=10 rsyslog-pgsql/app-password-confirm doesn't exist
> + return 10
> + true
> + db_reset rsyslog-pgsql/internal/skip-preseed
> + _db_cmd RESET rsyslog-pgsql/internal/skip-preseed
> + _db_internal_IFS=
> 
> + IFS=
> + printf %s\n RESET rsyslog-pgsql/internal/skip-preseed
> + IFS=
> 
> + read -r _db_internal_line
> + IFS=
> 
> + RET=10 rsyslog-pgsql/internal/skip-preseed doesn't exist
> + return 10
> + db_reset rsyslog-pgsql/internal/reconfiguring
> + _db_cmd RESET rsyslog-pgsql/internal/reconfiguring
> + _db_internal_IFS=
> 
> + IFS=
> + printf %s\n RESET rsyslog-pgsql/internal/reconfiguring
> + IFS=
> 
> + read -r _db_internal_line
> + IFS=
> 
> + RET=10 rsyslog-pgsql/internal/reconfiguring doesn't exist
> + return 10
> + return 10
> dpkg: error processing package rsyslog-pgsql (--configure):
>   installed rsyslog-pgsql package post-installation script subprocess returned error exit status 10
> 
> #+END_SRC
> 
> the last successful running part of the postinst script is the calling
> of dbc_forget_app_password(), dbc_postinst_cleanup() is where 10 as an
> exit code is returned and where the script fails.
> 
> As far as I can tell the error occurs because:
> 
> * db_reset $dbc_package/internal/reconfiguring returns 10, but the
>    script fails to catch this by either appending || true nor by
>    returning 0 at the end of the function.

This would mean ignoring an error.
Why do you think it is appropriate to ignore this failure?

> * I also noticed that on systems where the postinst script is broken
>    debconf does not hold any entries corresponding to the package;
>    which may point into the right direction for a possible fix.

Is this maybe a bug in dbconfig-common?

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Bug#1009866: rsyslog-pgsql: postinst script fails with non-zero exit at dbc_postinst_cleanup Wilko Meyer <wilko.meyer@iserv.eu> - 2022-04-19 16:40 +0200
  Bug#1009866: rsyslog-pgsql: postinst script fails with non-zero exit at dbc_postinst_cleanup Michael Biebl <biebl@debian.org> - 2022-04-19 19:30 +0200

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