improve license notices

[vpn-setup] / client-cert-helper

diff --git a/client-cert-helper b/client-cert-helper
index a1708134bd1eaf59e7bb481f1fb831fc664280d2..4da41eb9a83bb6227b1e2da389c4c3ea46e4615b 100755 (executable)
--- a/client-cert-helper
+++ b/client-cert-helper
@@ -1,4 +1,25 @@
 #!/bin/bash
+# I, Ian Kelling, follow the GNU license recommendations at
+# https://www.gnu.org/licenses/license-recommendations.en.html. They
+# recommend that small programs, < 300 lines, be licensed under the
+# Apache License 2.0. This file contains or is part of one or more small
+# programs. If a small program grows beyond 300 lines, I plan to switch
+# its license to GPL.
+
+# Copyright 2024 Ian Kelling
+
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+
+#     http://www.apache.org/licenses/LICENSE-2.0
+
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 set -eE -o pipefail
 
 # Outputs the keyfiles to stdout as tar.gz
@@ -6,11 +27,18 @@ set -eE -o pipefail
 rm -f /tmp/vpn-mk-client-cert.log
 exec 2>/tmp/vpn-mk-client-cert.log
 
+
+if ! test "$BASH_VERSION"; then echo "error: shell is not bash" >&2; exit 1; fi
+shopt -s inherit_errexit 2>/dev/null ||: # ignore fail in bash < 4.4
+set -eE -o pipefail
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?. PIPESTATUS: ${PIPESTATUS[*]}" >&2' ERR
+
+date >&2
+set -x
+
 name=$1
 common_name=$2
 
-echo common_name=$common_name >&2
-
 server_dir=/etc/openvpn
 if [[ -e /etc/openvpn/server ]]; then
   server_dir=/etc/openvpn/server
@@ -20,7 +48,7 @@ cafile=$server_dir/ca-$name.crt
 
 ### begin section roughly copied from vpn-server-setup
 rsadir=/etc/openvpn/easy-rsa-$name
-new=true
+new=true # newer easy-rsa version
 keyfiles=(
   $rsadir/pki/private/$common_name.key
   $rsadir/pki/issued/$common_name.crt
@@ -35,7 +63,7 @@ fi
 ### end section roughly copied from vpn-server-setup
 
 if [[ ! -e $cafile ]]; then
-  echo: error no cafile found at $cafile >/tmp/errors
+  echo error: no cafile found at $cafile >&2
   exit 1
 fi