[Buildroot] [git commit] support: properly check bash is available

[Thomas Petazzoni]

commit: http://git.buildroot.net/buildroot/commit/?id=38b81eb17253c2590d42243524eed556e80ff58f
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

The current check is broken, as it only checks if the user's login
shell is bash, not what the system shell is.

Mimick the sequence found in the top-level Makefile to search for
bash, except for the fallback case, where we explicitly check that
'sh' is bash, by checking if it sets $BASH, so we know the fallback
case, in the top-level Makefile, to use 'sh' will indeed use bash.

Remove superfluous semi-colons ';' at the end of lines, they are
not needed in a shell script (this is not C!)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
Cc: Peter Korsgaard <jacmet at uclibc.org>
Cc: Andrew Barnes <andy at outsideglobe.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 support/dependencies/dependencies.sh |   12 ++++++++----
 1 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/support/dependencies/dependencies.sh b/support/dependencies/dependencies.sh
index a8261b3..0566814 100755
--- a/support/dependencies/dependencies.sh
+++ b/support/dependencies/dependencies.sh
@@ -139,11 +139,15 @@ if [ ! -z "$CXXCOMPILER" ] ; then
 fi
 
 # Check bash
-if ! $SHELL --version 2>&1 | grep -q '^GNU bash'; then
+# We only check bash is available, setting SHELL appropriately is done
+# in the top-level Makefile, and we mimick the same sequence here
+if   [ -n "${BASH}" ]; then :
+elif [ -x /bin/bash ]; then :
+elif [ -z "$( sh -c 'echo $BASH' )" ]; then
 	echo
-	echo "You must install 'bash' on your build machine";
-	exit 1;
-fi;
+	echo "You must install 'bash' on your build machine"
+	exit 1
+fi
 
 # Check that a few mandatory programs are installed
 missing_progs="no"