/usr/share/dbconfig-common/dpkg/prerm is in dbconfig-common 1.8.47.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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### some global variables etc
###
dbc_go(){
local need_admin_pw dumpfile nowtime rmscript rmsql purgescript purgesql tsubstfile
. /usr/share/dbconfig-common/dpkg/common
_dbc_debug "(prerm) dbc_go() $@"
dbc_config $@
###
### get all the settings we need
###
dbc_read_package_config
# and re-run config for db-specific settings
dbc_set_dbtype_defaults $dbc_dbtype
if echo "$dbc_authenticated_dbtypes" | grep -q "$dbc_dbtype"; then
need_admin_pw="yup"
else
need_admin_pw=""
fi
if [ "$dbc_command" = "remove" ] && [ ! "$dbc_frontend" ]; then
###
### if they didn't want our help installing, we should assume
### they don't want our help removing either
###
if [ "$dbc_install" != "true" ]; then return 0; fi
###
### ask the admin if we should help with removal
###
if [ "$dbc_remove" ]; then
db_set $dbc_package/dbconfig-remove "$dbc_remove"
fi
db_fset $dbc_package/dbconfig-remove seen false
db_input high $dbc_package/dbconfig-remove || true
db_go || true
db_get $dbc_package/dbconfig-remove && dbc_remove="$RET"
if [ "$dbc_remove" != "true" ]; then
return 0;
fi
###
### package removal hooks
###
rmscript=/usr/share/dbconfig-common/scripts/$dbc_package/remove/$dbc_dbtype
rmsql=/usr/share/dbconfig-common/data/$dbc_package/remove/$dbc_dbtype
# run the script if it exists
if [ -f "$rmscript" ]; then
dbc_logpart "running maintainer removal script hook... "
if ! sh -c "$rmscript \"$@\""; then
dbc_error="$rmscript existed with non-zero status"
dbc_remove_error "running maintainer removal hook"
fi
dbc_logline "done"
fi
# run the sql if it exists
if [ -f "$rmsql" ]; then
dbc_logpart "running maintainer removal sql hook... "
if [ ! "$dbc_sql_substitutions" ]; then
$dbc_sqlfile_cmd $rmsql || dbc_remove_error "running maintainer removal sql hook"
else
tsubstfile=`dbc_mktemp`
/usr/sbin/dbconfig-generate-include -f template -o template_infile=$rmsql $dbc_packageconfig > $tsubstfile
$dbc_sqlfile_cmd $tsubstfile || dbc_remove_error "running maintainer removal sql hook"
rm -f $tsubstfile
fi
dbc_logline "done"
fi
###
### ask the admin if the database should be purged
###
db_fset $dbc_package/purge seen false
db_input high $dbc_package/purge || true
db_go || true
db_get $dbc_package/purge
dbc_purge="$RET"
if [ "$dbc_dbtype" = "pgsql" ] && \
[ "$dbc_authmethod_admin" = "ident" ];
then
need_admin_pw=""
fi
if [ "$dbc_purge" = "true" ]; then
# get the admin user password
if [ "$need_admin_pw" ]; then
dbc_get_admin_pass
fi
# dump the database into a temporary file
nowtime=`date +%Y-%m-%d-%H.%M`
if [ ! `dirname /var/tmp/$dbc_package` = /var/tmp ]; then
mkdir -p `dirname /var/tmp/$dbc_package`
fi
dumpfile=`mktemp /var/tmp/$dbc_package.$dbc_dbname.$nowtime.$dbc_dbtype.XXXXXX`
if [ ! -f $dumpfile ]; then
dbc_remove_error "creating temporary file for database dump"
fi
dbc_logline "dbconfig-common: dumping $dbc_dbtype database $dbc_dbname to $dumpfile"
$dbc_dump_cmd $dumpfile || dbc_remove_error "dumping database"
dbc_logline "dbconfig-common: dropping $dbc_dbtype database $dbc_dbname"
$dbc_dropdb_cmd || dbc_remove_error "dropping database"
[ "$dbc_tried_again" ] && return 0
dbc_logline "dbconfig-common: revoking privileges for user $dbc_dbuser on $dbc_dbname"
$dbc_dropuser_cmd
fi
fi
}
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