Fix script to remove some bashisms

Signed-off-by: Andre Moreira Magalhaes (andrunko) <andre.magalhaes@collabora.co.uk>

test-tumbler

-#!/bin/bash
+#!/bin/sh
 # vim: set sts=4 sw=4 et tw=0 :
 
 set -e
@@ -43,23 +43,23 @@ _kill_monitor_return() {
     return $1
 }
 
-bash_arrays_to_gvariant_as() {
+stringlist_to_gvariant_as() {
     local i converted="['$1'"
     shift
-    for i in "$@"; do
-        converted+=", '$i'"
+    for i in $@; do
+        converted="$converted, '$i'"
     done
-    converted+="]"
+    converted="$converted]"
     echo "${converted}"
 }
 
 _check_uris_have_thumbnail() {
     local size=$1
-    local uris=$2
-    for i in "${uris[@]}"; do
+    shift
+    for i in $@; do
         local thumb="${HOME}/.cache/thumbnails/${size}/$(echo -n "${i}" | md5sum | cut -f1 -d\ ).png"
         say $thumb
-        if [[ ! -f "${thumb}" ]]; then
+        if [ ! -f "${thumb}" ]; then
             whine "Couldn't find thumbnail $thumb, file $i didn't get thumbnailed!?"
             ret=1
         fi
@@ -74,20 +74,22 @@ _generate_thumbnails() {
     local size="$1"
     local special_dir="$2"
     shift 2
-    files=("$@")
+    files=$@
     logfile="${WORKDIR}/monitor-tumblerd.log"
     addr="org.freedesktop.thumbnails.Thumbnailer1"
     obj_path="/org/freedesktop/thumbnails/Thumbnailer1"
     method="org.freedesktop.thumbnails.Thumbnailer1.Queue"
-    uris=()
-    filetypes=()
+    uris=""
+    filetypes=""
 
-    for i in "${files[@]}"; do
+    # FIXME: This doesn't do whitespace/special character escaping, etc
+    for i in ${files}; do
         # Tumbler's AppArmor profile doesn't necessarily let it read the
         # apertis-tests directory if we're running uninstalled. Copy the
         # file to a more realistic location, which exercises the AppArmor
         # profile better anyway.
-        if [ $(( $RANDOM % 2 )) = 0 ] && [ -e "/home/shared/$special_dir" ]; then
+        _rand=$(od -A n -N 2 -t u2 /dev/urandom)
+        if [ $(( $_rand % 2 )) = 0 ] && [ -e "/home/shared/$special_dir" ]; then
             copy="/home/shared/$special_dir/apertis-tests__$(basename "$i")"
         else
             copy="$HOME/$special_dir/apertis-tests__$(basename "$i")"
@@ -96,9 +98,8 @@ _generate_thumbnails() {
         cp -v "$i" "$copy"
 
         # Need path relative to /
-        # FIXME: This doesn't do whitespace/special character escaping, etc
-        uris+=("file://$copy")
-        filetypes+=($(file --mime-type "$copy" | cut -d ":" -f 2 | tr -d ' '))
+        uris="${uris} file://$copy"
+        filetypes="${filetypes} $(file --mime-type "$copy" | cut -d ":" -f 2 | tr -d ' ')"
     done
 
     # Clear out old thumbnails.
@@ -109,8 +110,8 @@ _generate_thumbnails() {
     # Files to thumbnail
     ${GDBUS} call --session --dest "${addr}" --object-path "${obj_path}" \
         --method "${method}" \
-        "$(bash_arrays_to_gvariant_as "${uris[@]}")" \
-        "$(bash_arrays_to_gvariant_as "${filetypes[@]}")" \
+        "$(stringlist_to_gvariant_as ${uris})" \
+        "$(stringlist_to_gvariant_as ${filetypes})" \
         "${size}" foreground 0
 
     # Wait for thumbnailing to finish