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

Started byWilko Meyer <wilko.meyer@iserv.eu>
First post2022-04-19 16:40 +0200
Last post2022-04-19 19:30 +0200
Articles 2 — 2 participants

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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

#1100708 — Bug#1009866: rsyslog-pgsql: postinst script fails with non-zero exit at dbc_postinst_cleanup

FromWilko Meyer <wilko.meyer@iserv.eu>
Date2022-04-19 16:40 +0200
SubjectBug#1009866: rsyslog-pgsql: postinst script fails with non-zero exit at dbc_postinst_cleanup
Message-ID<EdXbj-9NDe-3@gated-at.bofh.it>
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.
* 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.

-- System Information:
Debian Release: 11.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-13-amd64 (SMP w/2 CPU threads)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages rsyslog-pgsql depends on:
ii  dbconfig-common        2.0.19
ii  debconf [debconf-2.0]  1.5.77
ii  libc6                  2.31-13+deb11u3
ii  libpq5                 13.5-0+deb11u1
ii  rsyslog                8.2102.0-2
ii  ucf                    3.0043

Versions of packages rsyslog-pgsql recommends:
ii  postgresql-client                         13+225
ii  postgresql-client-13 [postgresql-client]  13.5-0+deb11u1

Versions of packages rsyslog-pgsql suggests:
ii  postgresql  13+225

-- debconf information excluded

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#1100727

FromMichael Biebl <biebl@debian.org>
Date2022-04-19 19:30 +0200
Message-ID<EdZPQ-9Phv-3@gated-at.bofh.it>
In reply to#1100708

[Multipart message — attachments visible in raw view] — view raw

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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