Re: [PATCH v3] libqtest: refuse QTEST_QEMU_BINARY=qemu-kvm

[Thomas Huth <thuth@redhat.com>]

On 12/04/2021 16.30, Stefan Hajnoczi wrote:
> Some downstreams rename the QEMU binary to "qemu-kvm". This breaks
> qtest_get_arch(), which attempts to parse the target architecture from
> the QTEST_QEMU_BINARY environment variable.
> 
> Print an error instead of returning the architecture "kvm". Things fail
> in weird ways when the architecture string is bogus.
> 
> Arguably qtests should always be run in a build directory instead of
> against an installed QEMU. In any case, printing a clear error when this
> happens is helpful.
> 
> Since this is an error that is triggered by the user and not a test
> failure, use exit(1) instead of abort(). Change the existing abort()
> call in qtest_get_arch() to exit(1) too for the same reason and to be
> consistent.
> 
> Reported-by: Qin Wang <qinwang@rehdat.com>
> Cc: Emanuele Giuseppe Esposito <eesposit@redhat.com>
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
> v3:
>   * Add newline to wrap error message output at 80 columns [Thomas]
>   * Drop information about working around this using a symlink [Thomas]
>   * Use exit(1) instead of abort() [Thomas]
> 
>   tests/qtest/libqtest.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c
> index 71e359efcd..825b13a44c 100644
> --- a/tests/qtest/libqtest.c
> +++ b/tests/qtest/libqtest.c
> @@ -907,7 +907,14 @@ const char *qtest_get_arch(void)
>   
>       if (!end) {
>           fprintf(stderr, "Can't determine architecture from binary name.\n");
> -        abort();
> +        exit(1);
> +    }
> +
> +    if (!strstr(qemu, "-system-")) {
> +        fprintf(stderr, "QTEST_QEMU_BINARY must end with *-system-<arch> "
> +                "where 'arch' is the target\narchitecture (x86_64, aarch64, "
> +                "etc).\n");
> +        exit(1);
>       }
>   
>       return end + 1;
> 

Reviewed-by: Thomas Huth <thuth@redhat.com>