Re: [PATCH] Use SHELL_PATH to fork commands in run_command.c:prepare_shell_cmd

[Jonathan Nieder <jrnieder@gmail.com>]

Jeff King wrote:

> Does this default ever kick in? The Makefile defaults SHELL_PATH to
> /bin/sh, so we will always end up with at least that.
>
> Doing so at least makes us consistent across builds, but I wonder if we
> should leave it as "sh" on systems that do not set SHELL_PATH manually.
> Executing "sh" via the PATH is the normal system() thing to do.

It's more common for system() to default to /bin/sh.

I noticed the Makefile already doesn't do this sort of thing for
mandir and htmldir, but do you think changes to SHELL_PATH should be
tracked to force a rebuild when it changes?

	GIT-SHELL-PATH: FORCE
		@FLAGS='$(SHELL_PATH_SQ)'; \
		    if test x"$$FLAGS" != x"`cat GIT-SHELL-PATH 2>/dev/null`" ; then \
			echo 1>&2 "    * new shell path"; \
			echo "$$FLAGS" >GIT-SHELL-PATH; \
		    fi

	$(patsubst %.sh,%,$(SCRIPT_SH)) : % : %.sh GIT-SHELL-PATH
		...

	$(SCRIPT_LIB) : % : %.sh GIT-SHELL-PATH
		...

	run_command.sp run_command.o: GIT-SHELL-PATH
	exec_cmd.sp exec_cmd.s exec_cmd.o: EXTRA_CPPFLAGS = \
		'-DSHELL_PATH="$(SHELL_PATH_SQ)"'