keygeneration: add some output helpers

These use the same forms as in other shell projects in CrOS.

BUG=b:35587169
TEST=ran create_new_android_keys.sh and new output works
BRANCH=None

Change-Id: Id75fd77203795d7837537f12ab948376a7ad105e
Reviewed-on: https://chromium-review.googlesource.com/520786
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>

scripts/keygeneration/add_loem_keys.sh

@@ -8,7 +8,7 @@
 
 usage() {
   cat <<EOF
-Usage: ${0##*/} <number of loem keys to add>
+Usage: ${PROG} <number of loem keys to add>
 
 If the existing keyset is not set up for loem usage, it will be converted.
 
@@ -52,8 +52,7 @@ main() {
   local num_keys highest_key k
 
   if [[ ! -e ${VERSION_FILE} ]]; then
-    echo "missing ${VERSION_FILE} in ${PWD}; please create one" >&2
-    exit 1
+    die "missing ${VERSION_FILE} in ${PWD}; please create one"
   fi
 
   firmware_key_version=$(get_version "firmware_key_version")

scripts/keygeneration/common.sh

@@ -6,6 +6,29 @@
 # Common key generation functions.
 
 SCRIPT_DIR="$(dirname "$(readlink -f -- "$0")")"
+PROG=$(basename "$0")
+CROS_LOG_PREFIX="${PROG}: "
+
+# Prints an informational message.
+info() {
+  echo "${CROS_LOG_PREFIX}INFO: $*" >&2
+}
+
+# Prints a warning message.
+warn() {
+  echo "${CROS_LOG_PREFIX}WARNING: $*" >&2
+}
+
+# Prints an error message.
+error() {
+  echo "${CROS_LOG_PREFIX}ERROR: $*" >&2
+}
+
+# Print an error message and then exit the script.
+die() {
+  error "$@"
+  exit 1
+}
 
 # Algorithm ID mappings:
 RSA1024_SHA1_ALGOID=0

scripts/keygeneration/create_new_android_keys.sh

@@ -4,11 +4,12 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-set -e
+# Load common constants and functions.
+. "$(dirname "$0")/common.sh"
 
 usage() {
   cat <<EOF
-Usage: $0 DIR
+Usage: ${PROG} DIR
 
 Generate Android's 4 framework key pairs at DIR.  For detail, please refer to
 "Certificates and private keys" and "Manually generating keys" in
@@ -17,8 +18,7 @@ https://source.android.com/devices/tech/ota/sign_builds.html.
 EOF
 
   if [[ $# -ne 0 ]]; then
-    echo "ERROR: $*" >&2
-    exit 1
+    die "$*"
   else
     exit 0
   fi
@@ -48,6 +48,8 @@ make_pair() {
 }
 
 main() {
+  set -e
+
   local dir
 
   while [[ $# -gt 0 ]]; do
@@ -65,7 +67,7 @@ main() {
   done
 
   if [[ $# -ne 1 ]]; then
-    usage "Invalid argument."
+    usage "Missing output directory"
   fi
   dir=$1
 

scripts/keygeneration/create_new_keys.sh

@@ -11,7 +11,7 @@
 
 usage() {
   cat <<EOF
-Usage: $0 [options]
+Usage: ${PROG} [options]
 
 Options:
   --devkeyblock          Also generate developer firmware keyblock and data key
@@ -26,8 +26,7 @@ Options:
 EOF
 
   if [[ $# -ne 0 ]]; then
-    echo "ERROR: unknown option $*" >&2
-    exit 1
+    die "unknown option $*"
   else
     exit 0
   fi
@@ -86,8 +85,7 @@ main() {
       output_dir="$2"
       setperms="true"
       if [[ -d "${output_dir}" ]]; then
-        echo "ERROR: output dir (${output_dir}) already exists" >&2
-        exit 1
+        die "output dir (${output_dir}) already exists"
       fi
       shift
       ;;