Bug#798462: libsasl2-2: recreate and use /etc/sasl2/ for new installations

[David Magda]

I was reviewing some stuff and ran across this bug I filed a while ago. 
I do not know if this is the best way to do this, but:

I have created a "preinst" script to try to create /etc/sasl2/ by 
default, but handle situations where /usr/lib/sasl2/ already exists (and 
create softlinks for compat). There is also a "postrm" script to try to 
handle the various clean-up situations.

Please see attached.

Regards,
David

-------------- next part --------------
#! /bin/sh
set -e

# We want to put configuration stuff in /etc/sasl2/, but have to deal
# with legacy installations in /usr/lib/sasl2/. This script does
# a bunch of tests to try create things in /etc while supporting
# any 'legacy' installations (and docs) that use /usr.


if [ -e /usr/lib/sasl2 ]; then
	# if something is there, leave it, and deal with legacy stuff

	if [ -L /usr/lib/sasl2 ]; then
		# If a link exists, assume it points somewhere useful

		if [ -e /etc/sasl2 ]; then
			# if something is there, just assume it does
			# something useful and move one
			exit 0
		else
			# Create a link for compat
			ln -s /usr/lib/sasl2 /etc/sasl2 && exit 0
		fi
	elif [ -d /usr/lib/sasl2 ]; then
		# If a dir exits, leave it alone 
	
		if [ -e /etc/sasl2 ]; then
			# if something is there, just assume it does
			# something useful and move one
			exit 0
		else
			# Create a link for compat
			ln -s /usr/lib/sasl2 /etc/sasl2 && exit 0
		fi
	else
		# non-link, non-dir situation? manually have someone
		# look at it
		exit 10
	fi
else
	# nothing in /usr, so go with the new world order

	if [ -e /etc/sasl2 ]; then
		if [ -d /etc/sasl2 ]; then
			# Create a link for legacy support
			ln -s /etc/sasl2 /usr/lib/sasl2 && exit 0
		elif [ -L /etc/sasl2 ]; then
			# Not sure why a link would exist, but assume it
			# points somewhere useful, and enable legacy support
			ln -s /etc/sasl2 /usr/lib/sasl2 && exit 0
		else
			# non-link, non-dir situation? manually have someone
			# look at it
			exit 11
		fi
	else
		# nothing in /etc, nor in /usr,
		# so do things in the new way
		mkdir /etc/sasl2 || exit 2
		# create a link for legacy support 
		ln -s /etc/sasl2 /usr/lib/sasl2 && exit 0
	fi
fi

# We've reached an odd situation that is not covered by the above scenarios
# so throw an error and have someone manually look at things.
exit 20

# At some point in the future (Debian 10? 11?), /usr/lib/sasl2 should
# go away, and only /etc/sasl2 should be used.

# EOF
-------------- next part --------------
#! /bin/sh
set -e

# For legacy reasons, the config files can be in two places, 
# so test the various scenarios and remove the object/s
# in the appropriate way.

if [ -e /usr/lib/sasl2 ]; then
	if [ -L /usr/lib/sasl2 ]; then
		rm /usr/lib/sasl2 || exit 10
	elif [ -d /usr/lib/sasl2]; then
		# do not exit-out if it fails, as the contents may
		# have been left there on purpose
		rmdir /usr/lib/sasl2 
	else
		# non-link, non-dir situation? just keep going
		# instead of trying to be clever
	fi
fi

if [ -e /etc/sasl2 ]; then
	if [ -L /etc/sasl2 ]; then
		rm /etc/sasl2 || exit 20
	elif [ -d /etc/sasl2 ]; then
		# do not exit-out if it fails, as the contents may
		# have been left there on purpose
		rmdir /etc/sasl2
	else
		# non-link, non-dir situation? just keep going
		# instead of trying to be clever
	fi
fi

exit 0
# EOF