netdev - [PATCH iproute2 v4 2/5] configure: fix parsing issue on libbpf

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Date:   Thu,  7 Oct 2021 15:40:02 +0200
From:   Andrea Claudi <aclaudi@...hat.com>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com, bluca@...ian.org,
        phil@....cc, haliu@...hat.com
Subject: [PATCH iproute2 v4 2/5] configure: fix parsing issue on libbpf_dir option

configure is stuck in an endless loop if '--libbpf_dir' option is used
without a value:

$ ./configure --libbpf_dir
./configure: line 515: shift: 2: shift count out of range
./configure: line 515: shift: 2: shift count out of range
[...]

Fix it checking that a value is provided with the option.

Fixes: 7ae2585b865a ("configure: convert LIBBPF environment variables to command-line options")
Signed-off-by: Andrea Claudi <aclaudi@...hat.com>
---
 configure | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 05f75437..27db3ecb 100755
--- a/configure
+++ b/configure
@@ -486,7 +486,7 @@ usage()
 	cat <<EOF
 Usage: $0 [OPTIONS]
 	--include_dir <dir>	Path to iproute2 include dir
-	--libbpf_dir		Path to libbpf DESTDIR
+	--libbpf_dir <dir>	Path to libbpf DESTDIR
 	--libbpf_force		Enable/disable libbpf by force. Available options:
 				  on: require link against libbpf, quit config if no libbpf support
 				  off: disable libbpf probing
@@ -512,6 +512,7 @@ else
 				shift 2 ;;
 			--libbpf_dir)
 				LIBBPF_DIR="$2"
+				check_value "$LIBBPF_DIR"
 				shift 2 ;;
 			--libbpf_force)
 				if [ "$2" != 'on' ] && [ "$2" != 'off' ]; then
-- 
2.31.1