Subject: Re: [PATCH v2 net-next] selftests/net: change shebang to bash to support "source"

From: Guillaume Nault <[email-masked]>
Date: Sun, 31 Dec 2023 13:17:11 +0100

On Fri, Dec 29, 2023 at 09:19:31PM +0800, Yujie Liu wrote:
> The patch set [1] added a general lib.sh in net selftests, and converted
> several test scripts to source the lib.sh.
> 
> unicast_extensions.sh (converted in [1]) and pmtu.sh (converted in [2])
> have a /bin/sh shebang which may point to various shells in different
> distributions, but "source" is only available in some of them. For
> example, "source" is a built-it function in bash, but it cannot be
> used in dash.
> 
> Refer to other scripts that were converted together, simply change the
> shebang to bash to fix the following issues when the default /bin/sh
> points to other shells.

Looks like it'd be simpler to just replace the "source" commands with
"." and leave the shebang as is (unless there are other bash-specific
constructs in these scripts of course).

Generally speaking, I think we should avoid madating a specific shell,
unless that really simplifies the test script (which is not the case
here).

> # selftests: net: unicast_extensions.sh
> # ./unicast_extensions.sh: 31: source: not found
> # ###########################################################################
> # Unicast address extensions tests (behavior of reserved IPv4 addresses)
> # ###########################################################################
> # TEST: assign and ping within 240/4 (1 of 2) (is allowed)            [FAIL]
> # TEST: assign and ping within 240/4 (2 of 2) (is allowed)            [FAIL]
> # TEST: assign and ping within 0/8 (1 of 2) (is allowed)              [FAIL]
> # TEST: assign and ping within 0/8 (2 of 2) (is allowed)              [FAIL]
> # TEST: assign and ping inside 255.255/16 (is allowed)                [FAIL]
> # TEST: assign and ping inside 255.255.255/24 (is allowed)            [FAIL]
> # TEST: route between 240.5.6/24 and 255.1.2/24 (is allowed)          [FAIL]
> # TEST: route between 0.200/16 and 245.99/16 (is allowed)             [FAIL]
> # TEST: assign and ping lowest address (/24)                          [FAIL]
> # TEST: assign and ping lowest address (/26)                          [FAIL]
> # TEST: routing using lowest address                                  [FAIL]
> # TEST: assigning 0.0.0.0 (is forbidden)                              [ OK ]
> # TEST: assigning 255.255.255.255 (is forbidden)                      [ OK ]
> # TEST: assign and ping inside 127/8 (is forbidden)                   [ OK ]
> # TEST: assign and ping class D address (is forbidden)                [ OK ]
> # TEST: routing using class D (is forbidden)                          [ OK ]
> # TEST: routing using 127/8 (is forbidden)                            [ OK ]
> not ok 51 selftests: net: unicast_extensions.sh # exit=1
> 
> v1 -> v2:
>   - Fix pmtu.sh which has the same issue as unicast_extensions.sh,
>     suggested by Hangbin
>   - Change the style of the "source" line to be consistent with other
>     tests, suggested by Hangbin
> 
> Link: https://lore.kernel.org/all/[email-masked]/ [1]
> Link: https://lore.kernel.org/all/[email-masked]/ [2]
> Reported-by: kernel test robot <[email-masked]>
> Signed-off-by: Yujie Liu <[email-masked]>
> ---
>  tools/testing/selftests/net/pmtu.sh               | 4 ++--
>  tools/testing/selftests/net/unicast_extensions.sh | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
> index 175d3d1d773b..f10879788f61 100755
> --- a/tools/testing/selftests/net/pmtu.sh
> +++ b/tools/testing/selftests/net/pmtu.sh
> @@ -1,4 +1,4 @@
> -#!/bin/sh
> +#!/bin/bash
>  # SPDX-License-Identifier: GPL-2.0
>  #
>  # Check that route PMTU values match expectations, and that initial device MTU
> @@ -198,7 +198,7 @@
>  # - pmtu_ipv6_route_change
>  #	Same as above but with IPv6
>  
> -source ./lib.sh
> +source lib.sh
>  
>  PAUSE_ON_FAIL=no
>  VERBOSE=0
> diff --git a/tools/testing/selftests/net/unicast_extensions.sh b/tools/testing/selftests/net/unicast_extensions.sh
> index b7a2cb9e7477..f52aa5f7da52 100755
> --- a/tools/testing/selftests/net/unicast_extensions.sh
> +++ b/tools/testing/selftests/net/unicast_extensions.sh
> @@ -1,4 +1,4 @@
> -#!/bin/sh
> +#!/bin/bash
>  # SPDX-License-Identifier: GPL-2.0
>  #
>  # By Seth Schoen (c) 2021, for the IPv4 Unicast Extensions Project
> @@ -28,7 +28,7 @@
>  # These tests provide an easy way to flip the expected result of any
>  # of these behaviors for testing kernel patches that change them.
>  
> -source ./lib.sh
> +source lib.sh
>  
>  # nettest can be run from PATH or from same directory as this selftest
>  if ! which nettest >/dev/null; then
> 
> base-commit: cd4d7263d58ab98fd4dee876776e4da6c328faa3
> -- 
> 2.34.1
> 
>