[LTP] [PATCH v4 2/4] tst_ansi_color.sh: Allow to run with set -e

[Petr Vorel]

> Hi Petr,

> On Mon, Aug 8, 2022 at 7:38 PM Petr Vorel <pvorel@suse.cz> wrote:

> > set -e (or #!/bin/sh -e or set -o errexit) quits on any non-zero exit
> > code, therefore any && must be turned into || (or if ...; then ..; fi).
> > Fix hardens tst_res TINFO to be able to be used on scripts with errexit.

> > Signed-off-by: Petr Vorel <pvorel@suse.cz>
> > ---
> > changes v2->v3:
> > * really fix it.

> >  testcases/lib/tst_ansi_color.sh | 13 +++++++------
> >  1 file changed, 7 insertions(+), 6 deletions(-)

> > diff --git a/testcases/lib/tst_ansi_color.sh
> > b/testcases/lib/tst_ansi_color.sh
> > index 703df1eb8..517b709d0 100644
> > --- a/testcases/lib/tst_ansi_color.sh
> > +++ b/testcases/lib/tst_ansi_color.sh
> > @@ -24,18 +24,19 @@ tst_flag2color()

> >  tst_color_enabled()
> >  {
> > -       [ "$LTP_COLORIZE_OUTPUT" = "n" ] || [ "$LTP_COLORIZE_OUTPUT" = "0"
> > ] && return 0
> > -       [ "$LTP_COLORIZE_OUTPUT" = "y" ] || [ "$LTP_COLORIZE_OUTPUT" = "1"
> > ] && return 1
> > +       [ "$LTP_COLORIZE_OUTPUT" = "n" -o "$LTP_COLORIZE_OUTPUT" = "0" ]
> > || return 1
> > +       [ "$LTP_COLORIZE_OUTPUT" = "y" -o "$LTP_COLORIZE_OUTPUT" = "1" ]
> > || return 0

> This can work but looks a bit strange to read. I personally think
> use 'if ...; then ; fi' will be better to understand, because this is a
> simple function, no need to go with weird logic for over simplifying:).

Hi Li,

sure, I can reuse what I posted to as a suggestion to 3rd patch [1],
therefore I'll use it for these two:

if [ "$LTP_COLORIZE_OUTPUT" = "n" -o "$LTP_COLORIZE_OUTPUT" = "0" ]; then
        return 0
fi

if [ "$LTP_COLORIZE_OUTPUT" = "y" ] || [ "$LTP_COLORIZE_OUTPUT" = "1" ]; then
        return 1
fi

For the latter two I can use 'if ...' as well:

if [ "$color" = 1 ]; then
        tst_flag2color "$1"
fi
printf "$2"
if [ "$color" = 1 ]; then
        printf '\033[0m'
fi

although the original != 1 ] || is IMHO quite readable.

Kind regards,
Petr

[1] https://lore.kernel.org/ltp/20220808113756.11582-4-pvorel@suse.cz/

> >         [ -t 1 ] || return 0
> >         return 1
> >  }

> >  tst_print_colored()
> >  {
> > -       tst_color_enabled
> > -       local color=$?
> > +       local color=0

> > -       [ "$color" = "1" ] && tst_flag2color "$1"
> > +       tst_color_enabled || color=$?
> > +
> > +       [ "$color" != 1 ] || tst_flag2color "$1"
> >         printf "$2"
> > -       [ "$color" = "1" ] && printf '\033[0m'
> > +       [ "$color" != 1 ] || printf '\033[0m'
> >  }
> > --
> > 2.37.1


> > --
> > Mailing list info: https://lists.linux.it/listinfo/ltp