Add set -e and proper path check

scripts/backup

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+set -e
 app=kanboard
 
 # The parameter $1 is the backup directory location

scripts/install

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+set -e
 app=kanboard
 
 # Retrieve arguments
@@ -10,10 +12,8 @@ admin=$3
 email=$(sudo yunohost user info $admin | grep mail: | sed "s/mail: //g")
 
 # Check domain/path availability
-sudo yunohost app checkurl $domain$path -a $app
-if [[ ! $? -eq 0 ]]; then
-    exit 1
-fi
+sudo yunohost app checkurl $domain$path -a $app  \
+    || (echo "Path not available: $domain$path" && exit 1)
 
 # Generate random password
 db_pwd=$(openssl rand -hex 15)

scripts/restore

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+set -e
 app=kanboard
 
 # The parameter $1 is the uncompressed restore directory location

scripts/upgrade

@@ -1,4 +1,6 @@
 #!/bin/bash
+
+set -e
 app=kanboard
 
 # Retrieve settings