image: ISO backend: Probe xorriso before starting

Ensures that the user's time isn't wasted if xorriso is missing.

1 files changed, 6 insertions, 0 deletions

diff --git a/image/backends/iso.cc b/image/backends/iso.cc
index 4b27cc8..d6400d2 100644
--- a/image/backends/iso.cc
+++ b/image/backends/iso.cc
@@ -183,6 +183,12 @@ public:
             return COMMAND_MISSING;
         }
 
+        output_info("CD backend", "probing xorriso version...");
+        if(run_command("xorriso", {"-version"}) != 0) {
+            output_error("CD backend", "xorriso is not present");
+            return COMMAND_MISSING;
+        }
+
         /* REQ: ISO.1 */
         if(fs::exists(this->ir_dir, ec) && opts.find("keep") == opts.end()) {
             output_info("CD backend", "removing old IR tree", this->ir_dir);