genisoimage fails missing pathspec

Solution Verified - Updated -

Issue

  • When trying to create an ISO image, I get a "missing pathspec" error

    # genisoimage -U -r -v -T -J -joliet-long -V "RHEL-7.4 Server.x86_64" -volset "RHEL-7.4 Server.x86_64" -A "RHEL-7.4 Server.x86_64" -b isolinux/isolinux.bin -c isolinux/boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table -eltorito-alt-boot -e images/efiboot.img -no-emul-boot -o ../RHEL7.iso
     Warning: creating filesystem that does not conform to ISO-9660. I: -input-charset not specified, using utf-8 (detected in locale settings) genisoimage 1.1.11 (Linux) genisoimage: Missing pathspec. Usage: genisoimage [options] -o file directory ...
    

Environment

  • Red Hat Enterprise Linux
  • Upgrading from 6.9 to 7.4

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