From: Mischa POSLAWSKY <perl@shiar.org>
Date: Sun, 4 Jun 2017 21:54:51 +0000 (+0200)
Subject: tools: preserve make errors, ignore empty output
X-Git-Tag: v1.11~60
X-Git-Url: http://git.shiar.net/sheet.git/commitdiff_plain/94fea8c0e6ba8cea67d69dd0e49142811bba1611

tools: preserve make errors, ignore empty output

Exit codes lost since commit v1.9-305-ga7e3d17ab8 (2017-05-29)
[tools: atomic creation of include files].  Fixed using `mispipe`
also provided by moreutils.  As additional fail-safe, also catch
empty results with `ifne` to keep existing data on failure.
---

diff --git a/Makefile b/Makefile
index fb804a8..85fc990 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ download: data/DerivedAge.txt data/rfc1345.txt data/xorg-compose data/countryInf
 .PHONY: download
 
 # atomically create file by command
-cmdsave = @echo $1 $2 \>$@; $1 $2 | sponge $@
+cmdsave = @echo $1 $2 \>$@; mispipe '$1 $2' 'ifne sponge $@'
 # download git checkout
 gitsave = @if cd $@ 2>/dev/null; \
 	then echo git pull $@; git pull -q --ff-only || true; \