Credentials: Create a backup file

The issue is, when the user wants to change credentials, and the
credentials they use are not valid, the credentials will reset.
Keep a backup of credentials file so it can be restored if new
credentials are invalid.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@3mdeb.com>

include/dts-environment.sh

@@ -31,6 +31,7 @@ DPP_AVAIL_PACKAGES_LIST="$DPP_PACKAGE_MANAGER_DIR/packages-list.json"
 DPP_PACKAGES_SCRIPTS_PATH="$DPP_PACKAGE_MANAGER_DIR/packages-scripts"
 DPP_SUBMENU_JSON="$DPP_PACKAGES_SCRIPTS_PATH/submenu.json"
 DPP_CREDENTIAL_FILE="/etc/cloud-pass"
+DPP_CREDENTIAL_FILE_BCKP="$DPP_CREDENTIAL_FILE.bckp"
 FW_STORE_URL="${FW_STORE_URL_DEV:-https://dl.3mdeb.com/open-source-firmware/Dasharo}"
 FW_STORE_URL_DPP="dl.dasharo.com"
 CLOUD_REQUEST="X-Requested-With: XMLHttpRequest"

include/dts-functions.sh

@@ -1216,8 +1216,12 @@ main_menu_options() {
     # was not successful:
     if ! login_to_dpp_server; then
       print_warning "Cannot log in to DPP server, wrong email or password."
-      print_warning "The credentials won't be saved!"
-      clean_dpp_creds
+      if restore_dpp_creds; then
+        print_warning "Keeping existing credentials!"
+      else
+        print_warning "The credentials won't be saved!"
+        clean_dpp_creds
+      fi
       read -p "Press Enter to continue"
       return 0
     fi

include/dts-subscription.sh

@@ -107,6 +107,27 @@ clean_dpp_creds() {
   unset DPP_PASSWORD
 }
 
+# Backup dpp creds file in case new creds are bad.
+backup_dpp_creds() {
+  cp "$DPP_CREDENTIAL_FILE" "$DPP_CREDENTIAL_FILE_BCKP" 2>/dev/null
+}
+
+# Restores credential file and settings from backup and deletes backup.
+# Returns 0 if file was restored, 1 otherwise.
+restore_dpp_creds() {
+  # No backup, nothing to do
+  [ ! -f "$DPP_CREDENTIAL_FILE_BCKP" ] && return 1
+
+  # Backup exists → restore credentials
+  cp "$DPP_CREDENTIAL_FILE_BCKP" "$DPP_CREDENTIAL_FILE" || return 1
+  rm -f "$DPP_CREDENTIAL_FILE_BCKP" 2>/dev/null
+
+  DPP_EMAIL=$(sed -n '1p' <"$DPP_CREDENTIAL_FILE" | tr -d '\n')
+  DPP_PASSWORD=$(sed -n '2p' <"$DPP_CREDENTIAL_FILE" | tr -d '\n')
+
+  return 0
+}
+
 get_dpp_creds() {
   read -p "Enter DPP email:   " DPP_EMAIL
   if [[ -z "$DPP_EMAIL" ]]; then
@@ -128,6 +149,9 @@ get_dpp_creds() {
     return 1
   fi
 
+  # Make a copy of the file if credentials won't be accepted by minio
+  backup_dpp_creds
+
   # Export DPP creds to a file for future use. Currently these are being used
   # for both: MinIO (and its mc CLI) and cloudsend (deprecated, all DPP
   # sibscribtions will be megrated to MinIO):