1 files changed, 25 insertions, 11 deletions

diff --git a/src/xorriso-usb.sh b/src/xorriso-usb.sh
index 0adbb70..7017447 100644
--- a/src/xorriso-usb.sh
+++ b/src/xorriso-usb.sh
@@ -80,26 +80,41 @@ try_mount()
     mount -r "$1" /mnt && trap 'umount -l /mnt' EXIT
 }
 
+verbosely()
+{
+    (set -x; "$@")
+}
+
 xorriso_cmd()
 {
     # input variables:
 
-    # INPUT_DEVICE
-    # NEED_STDIO
+    ## that do not affect the output ISO image:
+
+    # SHOW_XORRISO_CMD
     # SILENT
+    # NEED_STDIO
+
+    ## that do not vary by invocation:
+
     # volid
-    # INPUT_DEVICE_COPIES
-    # REMOVE_BTRFS
-    # ADD_BTRFS
     # vmlinuz_dir
+    # efi_dir
     # gpg_iso_path
+
+    ## that specify sources of input:
+
+    # INPUT_DEVICE
     # gnupghome
-    # efi_dir
+    # $@ (btrfs filesystems)
+    # INPUT_DEVICE_COPIES
+
+    ## boolean flags
 
-    # $@ = btrfs filesystems
+    # REMOVE_BTRFS
+    # ADD_BTRFS
 
-    ([ "$SHOW_CMD" ] && set -x;
-     ${NO_ACT:+ :} \
+    ${SHOW_XORRISO_CMD:+ verbosely} ${NO_ACT:+ :} \
         xorriso \
             ${INPUT_DEVICE:+ -indev "$INPUT_DEVICE" } \
             -outdev ${NEED_STDIO:+stdio:}"$outdev" \
@@ -133,7 +148,6 @@ xorriso_cmd()
             --embedded-boot "${efi_dir}"/embedded.img \
             --protective-msdos-label \
             grub="${efi_dir}"/grub
-    )
 }
 
 run_xorriso()
@@ -266,6 +280,6 @@ if [ "$REPLACE_INITRD" ]; then
 fi
 
 SILENT=
-SHOW_CMD=y
+SHOW_XORRISO_CMD=y
 
 run_xorriso "$@"