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> On Wed, Aug 05, 2020 at 03:37:55PM -0400, Denton Liu wrote:
> > Hi Shourya,
> >
> > On Wed, Aug 05, 2020 at 11:19:18PM +0530, Shourya Shukla wrote:
> > > The tests in 't7401-submodule-summary.sh' were written a long time ago
> > > and have some violations with respect to our CodingGuidelines such as
> > > incorrect spacing in usages of the redirection operator and absence
> > > of line feed between statements in case of the '|' (pipe) operator.
> >
> > I'm not aware of anywhere in CodingGuidelines that says you can't have
> > the pipe operator on a single line. I assume you're referring to the
> > part that reads
> >
> > If a command sequence joined with && or || or | spans multiple
> > lines, put each command on a separate line and put && and || and
> > | operators at the end of each line, rather than the start.
> >
> > Note that says "If a command sequence [...] spans multiple lines", which
> > doesn't apply in our case.
> >
> > > Update it to match the CodingGuidelines.
> > >
> > > Mentored-by: Christian Couder <chriscool@tuxfamily.org>
> > > Mentored-by: Kaartic Sivaraam <kaartic.sivaraam@gmail.com>
> > > Signed-off-by: Shourya Shukla <shouryashukla.oo@gmail.com>
> > > ---
> > > t/t7401-submodule-summary.sh | 8 +++++---
> > > 1 file changed, 5 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/t/t7401-submodule-summary.sh b/t/t7401-submodule-summary.sh
> > > index 9bc841d085..4439fb7c17 100755
> > > --- a/t/t7401-submodule-summary.sh
> > > +++ b/t/t7401-submodule-summary.sh
> > > @@ -16,12 +16,13 @@ add_file () {
> > > owd=$(pwd)
> > > cd "$sm"
> > > for name; do
> > > - echo "$name" > "$name" &&
> > > + echo "$name" >"$name" &&
>
> This change is good.
>
> > > git add "$name" &&
> > > test_tick &&
> > > git commit -m "Add $name"
> > > done >/dev/null
> > > - git rev-parse --verify HEAD | cut -c1-7
> > > + git rev-parse --verify HEAD |
> > > + cut -c1-7
> >
> > For the reason above, I disagree with this change as-is. However, one
> > useful thing that you can do here is breaking the pipe up entirely. We
> > want to avoid is having a git command in the upstream of a pipe. This is
> > because the return code of a pipe comes from the last command executed
> > so if the rev-parse fails, its return code is swallowed and we have no
> > way of knowing.
> >
> > You could break the pipe up by storing the output of the rev-parse in an
> > intermediate file and then have cut read from that file.
>
> This is a good suggestion (I was preparing to write an email to say the
> same thing, but I'm glad that I checked Denton's response before doing
> so). Something like:
>
> git rev-parse --verify HEAD >out &&
> cut -c1-7 out
>
> would suffice and be in good style.Shourya Shukla <shouryashukla.oo@gmail.com>