From e0924047a15bc339c871a57294c55fb72b353f5e Mon Sep 17 00:00:00 2001
From: Sam Gammon <s@mg.sv>
Date: Tue, 5 Dec 2023 23:29:54 +0000
Subject: [PATCH] fix: generic generator on macos runners (#3016)

Fixes an issue with the `base64` call to generate subject data on
macOS-based runners.

Fixes and closes slsa-framework/slsa-github-generator#3015.

---------

Signed-off-by: Sam Gammon <sam@elide.ventures>
---
 .../generic/create-base64-subjects-from-file/action.yml  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/actions/generator/generic/create-base64-subjects-from-file/action.yml b/actions/generator/generic/create-base64-subjects-from-file/action.yml
index 5e953c73cb..eed900be4d 100644
--- a/actions/generator/generic/create-base64-subjects-from-file/action.yml
+++ b/actions/generator/generic/create-base64-subjects-from-file/action.yml
@@ -65,7 +65,12 @@ runs:
         set -euo pipefail
 
         object="{\"artifact_name\": \"${UNTRUSTED_ARTIFACT_NAME}\", \"sha256\": \"${SHA256}\", \"filename\": \"${UNTRUSTED_FILENAME}\"}"
-        echo "$object" | jq
-        base64_object=$(echo "$object" | base64 -w0)
 
+        if test "$RUNNER_OS" = "macOS"
+        then
+            base64_object=$(echo "$object" | base64)
+        else
+            base64_object=$(echo "$object" | base64 -w0)
+        fi
+        echo "$object" | jq
         echo "base64=${base64_object}" >> "$GITHUB_OUTPUT"