diff --git a/common.d/build_functions.sh b/common.d/build_functions.sh
index cdec159..55c6b70 100644
--- a/common.d/build_functions.sh
+++ b/common.d/build_functions.sh
@@ -21,6 +21,7 @@ setup_inet()
     echo "xiaomi-nabu" > "$rootdir/etc/hostname"
     echo "127.0.0.1 localhost
     127.0.1.1 xiaomi-nabu" > "$rootdir/etc/hosts"
+    return 0
 }
 
 create_image()
@@ -53,6 +54,7 @@ trim_image()
         log "Failed to trim image" ierror
         return 1
     }
+    return 0
 }
 
 # shellcheck disable=SC2155
@@ -74,6 +76,7 @@ mount_image()
     
     sed "s|{cmdline}|$SIMPLEINIT_CMDLINE|g" < ./drop/simpleinit.uefi.cfg > "$mountdir/boot/simpleinit/simpleinit.uefi.cfg"
     printf "%s" "$mountdir"
+    return 0
 }
 
 gen_fstab()
@@ -88,6 +91,7 @@ gen_fstab()
         [ -f "$rootdir/etc/fstab" ] && rm "$rootdir/etc/fstab"
         cp ./drop/fstab "$rootdir/etc/fstab"
     fi
+    return 0
 }
 
 umount_image()
@@ -104,10 +108,11 @@ umount_image()
     cp ./drop/postinstall "$rootdir/opt/nabu/postinstall"
     chmod +x "$rootdir/opt/nabu/postinstall"
 
-    umount "$rootdir/boot/efi" > /dev/null 2>&1
-    umount "$rootdir/boot/simpleinit" > /dev/null 2>&1
-    umount "$rootdir" > /dev/null 2>&1
-    rm -d "$rootdir" > /dev/null 2>&1
+    umount "$rootdir/boot/efi"
+    umount "$rootdir/boot/simpleinit"
+    umount "$rootdir"
+    rm -d "$rootdir"
+    return 0
 }
 
 prepare_chroot()
@@ -121,11 +126,11 @@ prepare_chroot()
     export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:\$PATH
     rootdir="$(realpath "$1")"
 
-    mount -t proc proc "$rootdir/proc" > /dev/null 2>&1
-    mount -t sysfs sysfs "$rootdir/sys" > /dev/null 2>&1
-    mount -t devtmpfs devtmpfs "$rootdir/dev" > /dev/null 2>&1
-    mount -t devpts devpts "$rootdir/dev/pts" > /dev/null 2>&1
-    mount -t tmpfs devshm "$rootdir/dev/shm" > /dev/null 2>&1
+    mount -t proc proc "$rootdir/proc"
+    mount -t sysfs sysfs "$rootdir/sys"
+    mount -t devtmpfs devtmpfs "$rootdir/dev"
+    mount -t devpts devpts "$rootdir/dev/pts"
+    mount -t tmpfs devshm "$rootdir/dev/shm"
     return 0
 }