[Bug 411045] [NEW] slapd cannot get resinstalled or removed if the configuration files were lost

[Christian Glahn]

Public bug reported:

Binary package hint: slapd

The installation scripts for slapd force good system even in recovery
modes.

In a moment of complete blackout, I dropped the configuration in
/etc/ldap/slap.d/  with 'rm -r *' .

Usually it is possible to reinstall a package in order to get to a clean
system state, but not with the slapd package.

I would expect the following:
If slapd is set for reinstallation, missing configuration files should not hinder the package manager to create the configuration files just as in a vanilla installation.

However, when I want to reinstall or remove slapd  I get is:
somehow the package management identifies the package as "configuration pending".
it tries to reconfigure the package and fails because the files are missing. 
The messages are as follows:

# apt-get install slapd --reinstall -f -m
1	Reading package lists...
2	Building dependency tree...
3	Reading state information...
4	0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
5	1 not fully installed or removed.
6	Need to get 0B/1519kB of archives.
7	After this operation, 0B of additional disk space will be used.
8	Do you want to continue [Y/n]? Preconfiguring packages ...
9	(Reading database ... 272567 files and directories currently installed.)
10	Preparing to replace slapd 2.4.15-1ubuntu3 (using .../slapd_2.4.15-1ubuntu3_i386.deb) ...
11	sed: can't read /etc/ldap/slapd.d//cn=config.ldif: No such file or directory
12	invoke-rc.d: initscript slapd, action "stop" failed.
13	dpkg: warning - old pre-removal script returned error exit status 2
14	dpkg - trying script from the new package instead ...
15	sed: can't read /etc/ldap/slapd.d//cn=config.ldif: No such file or directory
16	invoke-rc.d: initscript slapd, action "stop" failed.
17	dpkg: error processing /var/cache/apt/archives/slapd_2.4.15-1ubuntu3_i386.deb (--unpack):
18	subprocess new pre-removal script returned error exit status 2
19	Backing up /etc/ldap/slapd.d/ in /var/backups/slapd-2.4.15-1ubuntu3... done.
20	grep: /etc/ldap/slapd.d//cn=config/olcDatabase*: No such file or directory
21	sed: can't read /etc/ldap/slapd.d//cn=config.ldif: No such file or directory
22	invoke-rc.d: initscript slapd, action "start" failed.
23	dpkg: error while cleaning up:
24	subprocess post-installation script returned error exit status 2
25	Errors were encountered while processing:
26	/var/cache/apt/archives/slapd_2.4.15-1ubuntu3_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

no surprisingly  the old pre-removal script fails in line 11.
even less surprisingly the new pre-removal script fails in line 15.
This is the case because both scripts are the same. 

BTW, the server stop fails because the server did not run in the first
place.

The problem is that the script is not able to recognize that the
configuration files are missing.

The correct solution would be to test for the configuration files in the
pre-removal scripts and perform the operations only if the files are
actually present. Otherwise it should just ignore the missing
configuration and do only the pre-removal stuff that does not require
the configuration.

** Affects: openldap (Ubuntu)
     Importance: Undecided
         Status: New

-- 
slapd cannot get resinstalled or removed if the configuration files were lost
https://bugs.launchpad.net/bugs/411045
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