Re: [Qemu-devel] [PATCH v3 3/3] docker: Add test-block

[Eric Blake <eblake@redhat.com>]

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On 09/01/2017 10:22 AM, Fam Zheng wrote:
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  tests/docker/test-block | 22 ++++++++++++++++++++++
>  1 file changed, 22 insertions(+)
>  create mode 100755 tests/docker/test-block
> 
> diff --git a/tests/docker/test-block b/tests/docker/test-block
> new file mode 100755
> index 0000000000..efc77b4b91
> --- /dev/null
> +++ b/tests/docker/test-block
> @@ -0,0 +1,22 @@
> +#!/bin/bash -e

'set -e' is awful; it exists for backwards-compatibility with shell
scripts that pre-date functions, but is NOT intuitive and generally does
NOT do what you want when shell functions are added to the mix.  You're
better off doing manual error checking than relying on 'set -e' to check
for errors on your behalf.

> +#
> +# Run block test cases
> +#
> +# Copyright (c) 2017 Red Hat Inc.
> +#
> +# Authors:
> +#  Fam Zheng <famz@redhat.com>
> +#
> +# This work is licensed under the terms of the GNU GPL, version 2
> +# or (at your option) any later version. See the COPYING file in
> +# the top-level directory.
> +
> +. common.rc

Are we sure that '.' is early enough on $PATH that this will pick up the
right common.rc? Safer is '. ./common.rc'.

> +
> +cd "$BUILD_DIR"
> +
> +build_qemu --target-list=x86_64-softmmu
> +cd tests/qemu-iotests
> +for t in raw qcow2 nbd luks; do
> +    ./check -g quick -$t
> +done

That said, this script (and common.rc) is small enough to verify that
you probably aren't going to trip over those non-intuitive 'set -e'
behaviors, so the real reason to avoid it is if we want to be able to
copy-and-paste into other scripts that aren't using 'set -e' (on the
premise that avoiding implicit global state, like 'set -e', and being
explicit instead, is a good thing).

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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