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From: Prarit Bhargava <prarit@redhat.com>
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Subject: Makefile: Make `git` check portable (POSIX compatible)
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commit 0755b55afbf76fcacc31e98bb8c163c8e055ccb2
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Author: Paul Menzel <pmenzel@molgen.mpg.de>
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Date: Mon Jan 30 15:56:41 2017 +0100
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Makefile: Make `git` check portable (POSIX compatible)
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On systems using not the *GNU Bourne-Again SHell* (bash) as shell, the
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git check might fail. This happens on Debian systems where the *Debian
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Almquist Shell* (dash) is used by default for `/bin/sh`.
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As a result, after running `make` the file `version.c` always contains
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`unknown` instead of the correct version.
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The problem is, that `type -p git` is not portable. Use `command -v`
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instead [1][2].
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> Where bash is your shell/hashbang, consistently use hash (for
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> commands) or type (to consider built-ins & keywords).
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>
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> When writing a POSIX script, use command -v.
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Fixes: #42
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[1] https://stackoverflow.com/questions/592620/check-if-a-program-exists-from-a-bash-script
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"Check if a program exists from a Bash script"
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[2] https://unix.stackexchange.com/questions/85249/why-not-use-which-what-to-use-then
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"Why not use “which”? What to use then?"
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diff --git a/Makefile b/Makefile
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index 9dbbdbf8eb97e21a6d2efee7f308c1e7e742845b..e4341fceb882597ceebb56883625338c89923ee0 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -82,7 +82,7 @@ depend: .depend
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version.tmp: FORCE
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( echo -n "char version[] = \"" ; \
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- if type -p git >/dev/null; then \
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+ if command -v git >/dev/null; then \
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if [ -d .git ] ; then \
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git describe --tags HEAD | tr -d '\n'; \
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else \
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