From 20c96d48222e89ab603521f1da8d79ba97679bbb Mon Sep 17 00:00:00 2001
From: Aaron LI <aly@aaronly.me>
Date: Sun, 11 Mar 2018 11:08:58 +0800
Subject: Document "set -e" and fix cmd_status() invocation in cmd_fly()

---
 dfly-update | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dfly-update b/dfly-update
index 5f9d78e..6103bfa 100755
--- a/dfly-update
+++ b/dfly-update
@@ -7,6 +7,7 @@
 # snapshot builds.
 #
 
+# Exit immediately if any untested command fails in non-interactive mode
 set -e
 
 DEBUG=${DEBUG:-""}
@@ -90,6 +91,7 @@ _HAS_UPDATE=
 #
 
 debug() {
+    # Add "|| true" to work with "set -e"
     [ -n "${DEBUG}" ] && echo "DEBUG: $@" >&2 || true
 }
 
@@ -720,8 +722,9 @@ cmd_fly() {
     [ $# -eq 0 ] || \
         error ${EC_ARGS} "cmd_fly: invalid arguments: $@"
     echo "Checking status ..."
-    cmd_status
+    cmd_status || true
     if [ ${_HAS_UPDATE} -eq 1 ]; then
+        # Need to update
         local file="${CACHE_DIR}/${_FILENAME}"
         cmd_download "${_FILENAME}" ${_MD5}
         cmd_mount ${file}
-- 
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