Properly announced and checked md5sum as new dependency of merge_debian_isos

test/merge_debian_isos

@@ -27,9 +27,9 @@ usage() {
   echo "if they are needed and do not exist when the script starts." >&2
   echo "It depends on the following programs:" >&2
   echo "  awk, basename, cat, chmod, cp, dirname, expr, fgrep, grep," >&2
-  echo "  gunzip, gzip, head, ls, mkdir, mount, mv, rm, rmdir, sed, sh," >&2
-  echo "  sha256sum, sort, stat, sudo, umount, xorriso" >&2
-  echo "Recommended are: md5sum, sha1sum, sha512sum" >&2
+  echo "  gunzip, gzip, head, ls, md5sum, mkdir, mount, mv, rm, rmdir," >&2
+  echo "  sed, sh, sha256sum, sort, stat, sudo, umount, xorriso" >&2
+  echo "Recommended are: sha1sum, sha512sum" >&2
   echo >&2
   echo "Exported non-empty variable MERGE_DATE enforces a particular" >&2
   echo "date string in the text which gets prepended to /README.txt ." >&2
@@ -240,7 +240,7 @@ echo >&2
 echo "$(basename "$0") starting with $(expr $# - 2) ISO image files ..." >&2
 
 dep="awk basename cat chmod cp dirname expr fgrep grep"
-dep="$dep gunzip gzip head ls mkdir mount mv rm rmdir sed"
+dep="$dep gunzip gzip head ls md5sum mkdir mount mv rm rmdir sed"
 dep="$dep sha256sum sort stat sudo umount"
 missing=0
 for i in $dep
@@ -259,8 +259,11 @@ then
 fi
 if test "$XORRISO" = dummy
 then
-  echo 'NOTE: Variable XORRISO is set to "dummy".' >&2
-  echo '      Will not perform xorriso run but only show its arguments.' >&2
+  if test "$missing" = 0
+  then
+    echo 'NOTE: Variable XORRISO is set to "dummy".' >&2
+    echo '      Will not perform xorriso run but only show its arguments.' >&2
+  fi
 elif "$XORRISO" -no_rc -version >/dev/null 2>&1
 then
   if "$XORRISO" -no_rc -help 2>/dev/null | fgrep '"replay"' >/dev/null 2>&1