Re: [Libguestfs] [libnbd PATCH v2] tests/requires: wrap source code at 80 characters

On Wed, Apr 19, 2023 at 05:31:27PM +0200, Laszlo Ersek wrote: > Embedding a shell script in a multi-line C string literal is an exercise > in pain. I can see why the original author (whom I shall not look up with > git-blame :) ) went for the easy route. Still, we want the source code to > fit in 80 columns. > > At Eric's suggestion, also: > > - replace the non-portable control operator "|&" with the portable > redirection operator "2>&1" and the portable control operator "|"; > > - replace the "if ...; then exit 1; else exit 0; fi" constructs with "! > ...". Reviewed-by: Eric Blake <eblake(a)redhat.com&gt; > Notes: > v2: > > - v1: https://listman.redhat.com/archives/libguestfs/2023-April/031298.html > > - incorporate Eric's recommendations (commit message, code) > > tests/requires.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/tests/requires.c b/tests/requires.c > index 199e30605473..2b7031532fe2 100644 > --- a/tests/requires.c > +++ b/tests/requires.c > @@ -57,7 +57,8 @@ requires_qemu_nbd_tls_support (const char *qemu_nbd) > * interested in the error message that it prints. > */ > snprintf (cmd, sizeof cmd, > - "if %s --object tls-creds-x509,id=tls0 |& grep -sq 'TLS credentials support requires GNUTLS'; then exit 1; else exit 0; fi", > + "! %s --object tls-creds-x509,id=tls0 2>&1 \\\n" > + " | grep -sq 'TLS credentials support requires GNUTLS'\n", The four bytes " \\\n " portion between the two lines are not essential (the shell grammar doesn't care if there is a newline at this point); in fact, if you put the | before \n instead of after, you can use a newline without needing the \. But I don't see any point changing this code yet again just to golf out a few more bytes. Let's leave it as written in your v2.