[PATCH] oci: user-data: Try to decode base64 content

[Michael Tremer <michael.tremer@ipfire.org>]

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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(a)ipfire.org>
---
 src/initscripts/helper/oci-setup | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/src/initscripts/helper/oci-setup b/src/initscripts/helper/oci-setup
index 0763a96e7..98b9858d6 100644
--- a/src/initscripts/helper/oci-setup
+++ b/src/initscripts/helper/oci-setup
@@ -15,6 +15,24 @@ 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}"
 
@@ -115,6 +133,9 @@ 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
-- 
2.30.2