cleanup of the presentation generation process

Clean up some bash scripts, that are used for the generation of the
presentation.

Some improvements:
* Only ssh to fsmi-login if not already running on a fsmi host.
* Use the defined postgresql service instead of manually specifing the host
* Fix bugs that could occure when having spaces in filenames
* Find the fslogo.png in the root when generating the presentation

Signed-off-by: Tobias Wiese <tobias@tobiaswiese.com>

read_db.sh

@@ -1,15 +1,37 @@
-#!/bin/bash -e
-read -s -p "DB-Passwort: " password; 
-echo
+#!/bin/sh
+set -e
 
-raw_proto=$(echo $password | ssh fsmi "psql -A -t -h fsmi-db fsmi -c \"select datum from protokolle where ist_veroeffentlicht='f' and name is null order by datum asc\"" 2> /dev/null)
-echo $password | ssh fsmi "psql -A -t -h fsmi-db fsmi -c \"select protokoll from protokolle where ist_veroeffentlicht='f' and name is null order by datum desc limit 1\"" 2> /dev/null > data/last_proto
+: "${FSR_GEN_SSH_TO:=fsmi-login.fsmi.uni-karlsruhe.de}"
+: "${FSR_GEN_SSH:=$(test "$(hostname -d)" = "fsmi.uni-karlsruhe.de"; echo $?)}"
 
-for proto in $raw_proto;
-do
+sql() {
+	# $1: select
+	# $2: order_by
+	select="$1"
+	order_by="$2"
+	printf "
+	SELECT %s FROM protokolle
+	WHERE ist_veroeffentlicht=false AND name IS NULL
+	ORDER BY %s
+	" "$select" "$order_by" | tr '\n' ' '
+}
+
+cmd="psql --no-align --tuples-only service=fsmi -c"
+cmd_raw="$cmd '$(sql "datum" "datum ASC")'"
+cmd_last="$cmd '$(sql "protokoll" "datum DESC LIMIT 1")'"
+
+if [ -z "$FSR_GEN_SSH" ] || [ "$FSR_GEN_SSH" -eq 0 ]; then
+	raw_proto="$(sh -c "$cmd_raw")"
+	sh -c "$cmd_last" >data/last_proto
+else
+	raw_proto="$(ssh -- "$FSR_GEN_SSH_TO" "$cmd_raw")"
+	ssh -- "$FSR_GEN_SSH_TO" "$cmd_last" >data/last_proto
+fi
+
+for proto in $raw_proto; do
     echo "* FSR-Protokoll vom $proto"
-    echo "$proto" > data/last_date
 done > data/uvproto.txt
+echo "$proto" > data/last_date
 
 grep -oP '(?<=nächste Redeleitung: ).*(?=</li>)' data/last_proto > data/redeleitung
 grep -oP '(?<=nächstes Protokoll: ).*(?=</li>)' data/last_proto > data/protokoll