kbuild: add $(BASH) to run scripts with bash-extension

CONFIG_SHELL falls back to sh when bash is not installed on the system,
but nobody is testing such a case since bash is usually installed.
So, shell scripts invoked by CONFIG_SHELL are only tested with bash.

It makes it difficult to test whether the hashbang #!/bin/sh is real.
For example, #!/bin/sh in arch/powerpc/kernel/prom_init_check.sh is
false. (I fixed it up)

Besides, some shell scripts invoked by CONFIG_SHELL use bash-extension
and #!/bin/bash is specified as the hashbang, while CONFIG_SHELL may
not always be set to bash.

Probably, the right thing to do is to introduce BASH, which is bash by
default, and always set CONFIG_SHELL to sh. Replace $(CONFIG_SHELL)
with $(BASH) for bash scripts.

If somebody tries to add bash-extension to a #!/bin/sh script, it will
be caught in testing because /bin/sh is a symlink to dash on some major
distributions.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

diff --git a/Makefile b/Makefile
index db5706c..06e1e21 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -404,9 +404,7 @@ KCONFIG_CONFIG      ?= .config
 export KCONFIG_CONFIG
 
 # SHELL used by kbuild
-CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
-         else if [ -x /bin/bash ]; then echo /bin/bash; \
-         else echo sh; fi ; fi)
+CONFIG_SHELL := sh
 
 HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS 2>/dev/null)
 HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS 2>/dev/null)
@@ -443,6 +441,7 @@ PYTHON              = python
 PYTHON2                = python2
 PYTHON3                = python3
 CHECK          = sparse
+BASH           = bash
 
 CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
                  -Wbitwise -Wno-return-void -Wno-unknown-attribute $(CF)
@@ -488,7 +487,7 @@ KBUILD_LDFLAGS :=
 GCC_PLUGINS_CFLAGS :=
 CLANG_FLAGS :=
 
-export ARCH SRCARCH CONFIG_SHELL HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
+export ARCH SRCARCH CONFIG_SHELL BASH HOSTCC KBUILD_HOSTCFLAGS CROSS_COMPILE AS LD CC
 export CPP AR NM STRIP OBJCOPY OBJDUMP OBJSIZE PAHOLE LEX YACC AWK INSTALLKERNEL
 export PERL PYTHON PYTHON2 PYTHON3 CHECK CHECKFLAGS MAKE UTS_MACHINE HOSTCXX
 export KBUILD_HOSTCXXFLAGS KBUILD_HOSTLDFLAGS KBUILD_HOSTLDLIBS LDFLAGS_MODULE
@@ -1687,7 +1686,7 @@ clean: $(clean-dirs)
 # Generate tags for editors
 # ---------------------------------------------------------------------------
 quiet_cmd_tags = GEN     $@
-      cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@
+      cmd_tags = $(BASH) $(srctree)/scripts/tags.sh $@
 
 tags TAGS cscope gtags: FORCE
        $(call cmd,tags)
@@ -1708,7 +1707,7 @@ versioncheck:
                | xargs $(PERL) -w $(srctree)/scripts/checkversion.pl
 
 coccicheck:
-       $(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
+       $(Q)$(BASH) $(srctree)/scripts/$@
 
 namespacecheck:
        $(PERL) $(srctree)/scripts/namespace.pl

diff --git a/arch/mips/boot/Makefile b/arch/mips/boot/Makefile
index 3ce4dd5..528bd73 100644 (file)
--- a/arch/mips/boot/Makefile
+++ b/arch/mips/boot/Makefile
@@ -160,7 +160,7 @@ targets += vmlinux.lzo.itb
 quiet_cmd_itb-image = ITB     $@
       cmd_itb-image = \
                env PATH="$(objtree)/scripts/dtc:$(PATH)" \
-               $(CONFIG_SHELL) $(MKIMAGE) \
+               $(BASH) $(MKIMAGE) \
                -D "-I dts -O dtb -p 500 \
                        --include $(objtree)/arch/mips \
                        --warning no-unit_address_vs_reg" \

diff --git a/arch/powerpc/Makefile.postlink b/arch/powerpc/Makefile.postlink
index 83f8e5b..134f12f 100644 (file)
--- a/arch/powerpc/Makefile.postlink
+++ b/arch/powerpc/Makefile.postlink
@@ -18,7 +18,7 @@ quiet_cmd_relocs_check = CHKREL  $@
 ifdef CONFIG_PPC_BOOK3S_64
       cmd_relocs_check =                                               \
        $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@" ; \
-       $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$@"
+       $(BASH) $(srctree)/arch/powerpc/tools/unrel_branch_check.sh "$(OBJDUMP)" "$@"
 else
       cmd_relocs_check =                                               \
        $(CONFIG_SHELL) $(srctree)/arch/powerpc/tools/relocs_check.sh "$(OBJDUMP)" "$@"

diff --git a/arch/powerpc/kernel/prom_init_check.sh b/arch/powerpc/kernel/prom_init_check.sh
index 160bef0..78bab17 100644 (file)
--- a/arch/powerpc/kernel/prom_init_check.sh
+++ b/arch/powerpc/kernel/prom_init_check.sh
@@ -33,7 +33,7 @@ OBJ="$2"
 
 ERROR=0
 
-function check_section()
+check_section()
 {
     file=$1
     section=$2

diff --git a/kernel/Makefile b/kernel/Makefile
index ef0d95a..6027677 100644 (file)
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -126,7 +126,7 @@ $(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
 $(obj)/kheaders.o: $(obj)/kheaders_data.tar.xz
 
 quiet_cmd_genikh = CHK     $(obj)/kheaders_data.tar.xz
-cmd_genikh = $(CONFIG_SHELL) $(srctree)/kernel/gen_kheaders.sh $@
+      cmd_genikh = $(BASH) $(srctree)/kernel/gen_kheaders.sh $@
 $(obj)/kheaders_data.tar.xz: FORCE
        $(call cmd,genikh)
 

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 888e5c8..7ab1771 100644 (file)
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -364,7 +364,7 @@ UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
 UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
 
 quiet_cmd_uimage = UIMAGE  $@
-      cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
+      cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
                        -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
                        -T $(UIMAGE_TYPE) \
                        -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \