Fix return codes

caches-manager

@@ -7,7 +7,7 @@ shopt -s nullglob dotglob
 
 # $1: target directory
 backup() {
-    [ -e "$1" ] || return
+    [ -e "$1" ] || return 0
     echo -n "target exists, backing up... "
     mv -T --backup=numbered "$1" "$1.bak"
 }
@@ -44,7 +44,7 @@ make_bind() {
 # $2: target directory
 make_link() {
     if [ -L "$2" ]; then
-        [ "$(readlink "$2")" == "$1" ] && return
+        [ "$(readlink "$2")" == "$1" ] && return 0
     else
         backup "$2"
     fi
@@ -71,17 +71,17 @@ create_cache() {
 
     if [ ! -d "${parent}" ]; then
         echo "parent directory does not exist, skip."
-        return
+        return 0
     fi
 
     if [ ! -w "${parent}" ]; then
         echo "no write access to parent directory, skip."
-        return
+        return 0
     fi
 
     if mountpoint -q "${dir}"; then
         echo "mount point found, skip."
-        return
+        return 0
     fi
 
     if [ "$3" == "b" ]; then
@@ -116,7 +116,7 @@ read_config() {
 
 # $1: configs directory
 read_configs_from() {
-    [ -d "$1" ] || return
+    [ -d "$1" ] || return 0
 
     for f in "$1/"*.conf; do
         read_config "${f}"