Fix healthcheck

src/backup-wrapper.sh

@@ -14,63 +14,70 @@ execute_script() {
 }
 
 configure_environment() {
-    local index=$1
-    local all_vars_set=true
-    # required variables
-    for var in BORG_PASSPHRASE BORG_REPO; do
-        local indexed_var_name="${var}_${index}"
-        if [[ -n "${!indexed_var_name}" ]]; then
-            export "$var"="${!indexed_var_name}"
-        else
-            all_vars_set=false
-            break
-        fi
-    done
+    local repo_var="BORG_REPO_$1" passphrase_var="BORG_PASSPHRASE_$1" remote_var="BORG_REMOTE_PATH_$1"
+    [[ -n ${!repo_var} && -n ${!passphrase_var} ]] || return 1
+    export BORG_REPO="${!repo_var}" BORG_PASSPHRASE="${!passphrase_var}"
 
-    # optional variables
-    local indexed_var_name="BORG_REMOTE_PATH_${index}"
-    if [[ -n "${!indexed_var_name}" ]]; then
-        export BORG_REMOTE_PATH="${!indexed_var_name}"
+    if [[ -n ${!remote_var} ]]; then
+        export BORG_REMOTE_PATH="${!remote_var}"
     else
         unset BORG_REMOTE_PATH
     fi
-
-    [[ $all_vars_set == true ]]
 }
 
 main() {
     if [ -n "$BORG_REPO" ]; then
         # fallback case if multi-target backup isn't needed
-        if execute_script; then
-            date > /health/backup_completion_time.log
-        else
+        if ! execute_script; then
             echo "Skipping completion log due to backup failure"
+            return 1
         fi
     else
         local index=0
-        local configurations_found=false
         local any_failed=false
+        local completed_indices=" "
 
-        while configure_environment $index; do
+        while configure_environment "$index"; do
             execute_script || any_failed=true
-            configurations_found=true
+            completed_indices+="$index "
             unset BORG_PASSPHRASE BORG_REMOTE_PATH BORG_REPO
             ((index++))
         done
 
         echo "Finished backup script at $(date)"
-        if [[ $any_failed == false ]]; then
-            date > /health/backup_completion_time.log # this used by the healtcheck
-        else
-            echo "Skipping completion log due to backup failure(s)"
+        if (( index == 0 )); then
+            echo "No valid configuration found. Please ensure environment variables are set properly."
+            return 1
         fi
 
-        if [[ $configurations_found == false ]]; then
-            echo "No valid configuration found. Please ensure environment variables are set properly."
+        # A missing or incomplete target must not silently hide later targets.
+        local indexed_var_name
+        for indexed_var_name in ${!BORG_REPO_@} ${!BORG_PASSPHRASE_@} ${!BORG_REMOTE_PATH_@}; do
+            [[ -n ${!indexed_var_name} ]] || continue
+            case "$completed_indices" in
+                *" ${indexed_var_name##*_} "*) ;;
+                *)
+                    echo "Invalid or non-contiguous backup configuration: $indexed_var_name. Skipping completion log."
+                    return 1
+                    ;;
+            esac
+        done
+
+        if [[ $any_failed == true ]]; then
+            echo "Skipping completion log due to backup failure(s)"
+            return 1
         fi
     fi
+
+    # Rename only a complete timestamp, leaving the previous success intact on failure.
+    mkdir -p /health || return 1
+    trap 'rm -f /health/backup_completion_time.log.$$' EXIT
+    date -u '+%Y-%m-%dT%H:%M:%SZ' > /health/backup_completion_time.log.$$ &&
+        mv -fT /health/backup_completion_time.log.$$ /health/backup_completion_time.log
 }
 
 main
+backup_status=$?
 
 echo "Finished backup wrapper script at $(date)"
+exit "$backup_status"