RE: [PATCH] tools/configure: drop BASH configure variable

[Paul Durrant <xadimgnik@gmail.com>]

> -----Original Message-----
> From: Andrew Cooper <andrew.cooper3@citrix.com>
> Sent: 26 June 2020 18:01
> To: Xen-devel <xen-devel@lists.xenproject.org>
> Cc: Andrew Cooper <andrew.cooper3@citrix.com>; Ian Jackson <Ian.Jackson@citrix.com>; Wei Liu
> <wl@xen.org>; Daniel De Graaf <dgdegra@tycho.nsa.gov>; Paul Durrant <paul@xen.org>
> Subject: [PATCH] tools/configure: drop BASH configure variable
> 
> This is a weird variable to have in the first place.  The only user of it is
> XSM's CONFIG_SHELL, which opencodes a fallback to sh, and the only two scripts
> run with this are shebang sh anyway, so don't need bash in the first place.
> 
> Make the mkflask.sh and mkaccess_vector.sh scripts executable, drop the
> CONFIG_SHELL, and drop the $BASH variable to prevent further use.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
> ---
> CC: Ian Jackson <Ian.Jackson@citrix.com>
> CC: Wei Liu <wl@xen.org>
> CC: Daniel De Graaf <dgdegra@tycho.nsa.gov>
> CC: Paul Durrant <paul@xen.org>
> 
> ./autogen.sh needs rerunning on commit.
> 
> RFC for 4.14.  This is a cleanup to the build system.
> 
> There is a separate check for [BASH] in the configure script, which is
> checking the requirement for the Linux hotplug scripts.  Really, that is a
> runtime requirement not a build time requirement, and it is rude to require
> bash in a build environment on this basis.  IMO, that check wants dropping as
> well.

That sounds quite reasonable.

Release-acked-by: Paul Durrant <paul@xen.org>

> ---
>  config/Tools.mk.in                      | 1 -
>  tools/configure.ac                      | 1 -
>  xen/xsm/flask/Makefile                  | 8 ++------
>  xen/xsm/flask/policy/mkaccess_vector.sh | 0
>  xen/xsm/flask/policy/mkflask.sh         | 0
>  5 files changed, 2 insertions(+), 8 deletions(-)
>  mode change 100644 => 100755 xen/xsm/flask/policy/mkaccess_vector.sh
>  mode change 100644 => 100755 xen/xsm/flask/policy/mkflask.sh
> 
> diff --git a/config/Tools.mk.in b/config/Tools.mk.in
> index 23df47af8d..48bd9ab731 100644
> --- a/config/Tools.mk.in
> +++ b/config/Tools.mk.in
> @@ -12,7 +12,6 @@ PYTHON              := @PYTHON@
>  PYTHON_PATH         := @PYTHONPATH@
>  PY_NOOPT_CFLAGS     := @PY_NOOPT_CFLAGS@
>  PERL                := @PERL@
> -BASH                := @BASH@
>  XGETTTEXT           := @XGETTEXT@
>  AS86                := @AS86@
>  LD86                := @LD86@
> diff --git a/tools/configure.ac b/tools/configure.ac
> index 9d126b7a14..6614a4f130 100644
> --- a/tools/configure.ac
> +++ b/tools/configure.ac
> @@ -297,7 +297,6 @@ AC_ARG_VAR([PYTHON], [Path to the Python parser])
>  AC_ARG_VAR([PERL], [Path to Perl parser])
>  AC_ARG_VAR([BISON], [Path to Bison parser generator])
>  AC_ARG_VAR([FLEX], [Path to Flex lexical analyser generator])
> -AC_ARG_VAR([BASH], [Path to bash shell])
>  AC_ARG_VAR([XGETTEXT], [Path to xgetttext tool])
>  AC_ARG_VAR([AS86], [Path to as86 tool])
>  AC_ARG_VAR([LD86], [Path to ld86 tool])
> diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile
> index 07f36d075d..ba8f31a02c 100644
> --- a/xen/xsm/flask/Makefile
> +++ b/xen/xsm/flask/Makefile
> @@ -8,10 +8,6 @@ CFLAGS-y += -I./include
> 
>  AWK = awk
> 
> -CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
> -          else if [ -x /bin/bash ]; then echo /bin/bash; \
> -          else echo sh; fi ; fi)
> -
>  FLASK_H_DEPEND = policy/security_classes policy/initial_sids
>  AV_H_DEPEND = policy/access_vectors
> 
> @@ -24,14 +20,14 @@ extra-y += $(ALL_H_FILES)
> 
>  mkflask := policy/mkflask.sh
>  quiet_cmd_mkflask = MKFLASK $@
> -cmd_mkflask = $(CONFIG_SHELL) $(mkflask) $(AWK) include $(FLASK_H_DEPEND)
> +cmd_mkflask = $(mkflask) $(AWK) include $(FLASK_H_DEPEND)
> 
>  $(subst include/,%/,$(FLASK_H_FILES)): $(FLASK_H_DEPEND) $(mkflask) FORCE
>  	$(call if_changed,mkflask)
> 
>  mkaccess := policy/mkaccess_vector.sh
>  quiet_cmd_mkaccess = MKACCESS VECTOR $@
> -cmd_mkaccess = $(CONFIG_SHELL) $(mkaccess) $(AWK) $(AV_H_DEPEND)
> +cmd_mkaccess = $(mkaccess) $(AWK) $(AV_H_DEPEND)
> 
>  $(subst include/,%/,$(AV_H_FILES)): $(AV_H_DEPEND) $(mkaccess) FORCE
>  	$(call if_changed,mkaccess)
> diff --git a/xen/xsm/flask/policy/mkaccess_vector.sh b/xen/xsm/flask/policy/mkaccess_vector.sh
> old mode 100644
> new mode 100755
> diff --git a/xen/xsm/flask/policy/mkflask.sh b/xen/xsm/flask/policy/mkflask.sh
> old mode 100644
> new mode 100755
> --
> 2.11.0