scripts: check that archive paths exist

Check that MetalK8s archive paths point
to existing file and if not print a clear
error message

Refs: #3079

scripts/iso-manager.sh

@@ -85,6 +85,26 @@ get_configured_archives() {
         sed -rn 's/^- (.+)$/\1/p'
 }
 
+_check_archives() {
+    local -a not_existing
+
+    for archive; do
+        if [ ! -e "$archive" ]; then
+            not_existing+=("$archive")
+        fi
+    done
+
+    if (( ${#not_existing[@]} )); then
+        echo "The following archives do not exist:" >&2
+        for archive in "${not_existing[@]}"; do
+            echo "- $archive" >&2
+        done
+        return 1
+    fi
+
+    return 0
+}
+
 _add_archives() {
     # Skip adding archive if None passed
     [ $# -lt 1 ] && return 0
@@ -150,6 +170,15 @@ _configure_archives() {
 _set_env
 [ -z "$SALTENV" ] && die "saltenv not set"
 
+if (( ${#ARCHIVES[@]} )); then
+    run "Check new archives" _check_archives "${ARCHIVES[@]}"
+fi
 mapfile -t CONFIGURED_ARCHIVES < <(get_configured_archives)
-run "Add archives" _add_archives ${ARCHIVES[@]+"${ARCHIVES[@]}"}
+if (( ${#CONFIGURED_ARCHIVES[@]} )); then
+    run "Check $BOOTSTRAP_CONFIG file" _check_archives \
+        "${CONFIGURED_ARCHIVES[@]}"
+fi
+if (( ${#ARCHIVES[@]} )); then
+    run "Add archives" _add_archives "${ARCHIVES[@]}"
+fi
 run "Configure archives" _configure_archives