[Libguestfs] [PATCH] common/mltools: Add a debug statement when we try to run a non-existent program.

Previously: $ virt-v2v -v -x -i disk fedora-28.img -o openstack -oo server-id=foo virt-v2v: libguestfs 1.39.11fedora=29,release=1.fc29,libvirt (x86_64) libvirt version: 4.5.0 virt-v2v: error: openstack: precheck failed, there may be a problem with authentication, see earlier error messages rm -rf '/var/tmp/null.dTxRFN' Notice there is no "earlier error message". After this commit the error changes to: openstack: executable not found virt-v2v: error: openstack: precheck failed, there may be a problem with authentication, see earlier error messages --- common/mltools/tools_utils.ml | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/common/mltools/tools_utils.ml b/common/mltools/tools_utils.ml index ad08d05eb..298d89b4d 100644 --- a/common/mltools/tools_utils.ml +++ b/common/mltools/tools_utils.ml @@ -420,9 +420,11 @@ and do_run ?(echo_cmd = true) ?stdout_fd ?stderr_fd args = Either (pid, app, stdout_fd, stderr_fd) with | Executable_not_found _ -> - Or 127 - | Unix.Unix_error (errcode, _, _) when errcode = Unix.ENOENT -> - Or 127 + debug "%s: executable not found" app; + Or 127 + | Unix.Unix_error (errcode, fn, _) when errcode = Unix.ENOENT -> + debug "%s: %s: executable not found" app fn; + Or 127 and do_teardown app outfd errfd exitstat = Option.may Unix.close outfd; -- 2.19.0.rc0