[PATCH 09/11] hornet: scripts: set a non-zero error code for usage

[Blaise Boscaccy]

It was possible that build scripts may continue if arguments were
missing.

Signed-off-by: Blaise Boscaccy <bboscaccy at linux.microsoft.com>
---
 scripts/hornet/extract-insn.sh | 10 +++++-----
 scripts/hornet/extract-map.sh  | 10 +++++-----
 scripts/hornet/extract-skel.sh | 10 +++++-----
 scripts/hornet/write-sig.sh    | 10 +++++-----
 4 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/scripts/hornet/extract-insn.sh b/scripts/hornet/extract-insn.sh
index 52338f057ff6b..e136932275aa5 100755
--- a/scripts/hornet/extract-insn.sh
+++ b/scripts/hornet/extract-insn.sh
@@ -8,11 +8,11 @@
 # License as published by the Free Software Foundation.
 
 function usage() {
-    echo "Sample script for extracting instructions"
-    echo "autogenerated eBPF lskel headers"
-    echo ""
-    echo "USAGE: header_file"
-    exit
+    echo "Sample script for extracting instructions" >&2
+    echo "autogenerated eBPF lskel headers" >&2
+    echo "" >&2
+    echo "USAGE: header_file" >&2
+    exit 1
 }
 
 ARGC=$#
diff --git a/scripts/hornet/extract-map.sh b/scripts/hornet/extract-map.sh
index c309f505c6238..058ac1b32d743 100755
--- a/scripts/hornet/extract-map.sh
+++ b/scripts/hornet/extract-map.sh
@@ -8,11 +8,11 @@
 # License as published by the Free Software Foundation.
 
 function usage() {
-    echo "Sample script for extracting instructions"
-    echo "autogenerated eBPF lskel headers"
-    echo ""
-    echo "USAGE: header_file"
-    exit
+    echo "Sample script for extracting instructions" >&2
+    echo "autogenerated eBPF lskel headers" >&2
+    echo "" >&2
+    echo "USAGE: header_file" >&2
+    exit 1
 }
 
 ARGC=$#
diff --git a/scripts/hornet/extract-skel.sh b/scripts/hornet/extract-skel.sh
index 6550a86b89917..abc435e2bcd4e 100755
--- a/scripts/hornet/extract-skel.sh
+++ b/scripts/hornet/extract-skel.sh
@@ -8,11 +8,11 @@
 # License as published by the Free Software Foundation.
 
 function usage() {
-    echo "Sample script for extracting instructions and map data out of"
-    echo "autogenerated eBPF lskel headers"
-    echo ""
-    echo "USAGE: header_file field"
-    exit
+    echo "Sample script for extracting instructions and map data out of" >&2
+    echo "autogenerated eBPF lskel headers" >&2
+    echo "" >&2
+    echo "USAGE: header_file field" >&2
+    exit 1
 }
 
 ARGC=$#
diff --git a/scripts/hornet/write-sig.sh b/scripts/hornet/write-sig.sh
index 7eaabe3bab9aa..ad2b65761c282 100755
--- a/scripts/hornet/write-sig.sh
+++ b/scripts/hornet/write-sig.sh
@@ -8,11 +8,11 @@
 # License as published by the Free Software Foundation.
 
 function usage() {
-    echo "Sample for rewriting an autogenerated eBPF lskel headers"
-    echo "with a new signature"
-    echo ""
-    echo "USAGE: header_file sig"
-    exit
+    echo "Sample for rewriting an autogenerated eBPF lskel headers" >&2
+    echo "with a new signature" >&2
+    echo "" >&2
+    echo "USAGE: header_file sig" >&2
+    exit 1
 }
 
 ARGC=$#
-- 
2.53.0