oci: user-data: Try to decode base64 content

Terraform only supports sending any shell scripts encoded in base64
which is however not required by Oracle. Therefore we have to test if
the script is encoded or not.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>

diff --git a/src/initscripts/helper/oci-setup b/src/initscripts/helper/oci-setup
index 4dbc05ae3fab017f25f53966cfb9b9ea3296218c..782fde5a2b4fd607beb85891b7b839eb281db21b 100644 (file)
--- a/src/initscripts/helper/oci-setup
+++ b/src/initscripts/helper/oci-setup
@@ -34,6 +34,24 @@ get() {
        wget -qO - "http://169.254.169.254/opc/v1/${file}"
 }
 
+try_base64_decode() {
+       local input="${1}"
+
+       local tmp="$(mktemp)"
+
+       # Try to decode this and return output if successful
+       if base64 -d <<< "${input}" > "${tmp}" 2>/dev/null; then
+               echo "$(<${tmp})"
+
+       # Otherwise just return the input
+       else
+               echo "${input}"
+       fi
+
+       # Cleanup
+       unlink "${tmp}"
+}
+
 to_address() {
        local n="${1}"
 
@@ -134,6 +152,9 @@ import_oci_configuration() {
                # Download a startup script
                local script="$(get instance/metadata/user_data)"
 
+               # Try to decode this
+               script="$(try_base64_decode "${script}")"
+
                # Execute the script
                if [ "${script:0:2}" = "#!" ]; then
                        echo "${script}" > /tmp/user-data.script