From d161c9a9dbd24bb7e0356e4e07983345777d85aa Mon Sep 17 00:00:00 2001
From: Daniel Black <daniel@mariadb.org>
Date: Thu, 1 May 2025 14:33:19 +1000
Subject: Skip read-only check when output file specified

Only check if input files are read-only when overwriting them; skip
that check when the output goes to a different file.

* src/patch.c (main): Set read_only_behavior to RO_IGNORE when an output
file has been specified.
* tests/read-only-files: Add test case.
---
 src/patch.c           | 5 ++++-
 tests/read-only-files | 5 +++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/patch.c b/src/patch.c
index 91cb646..42c093c 100644
--- a/src/patch.c
+++ b/src/patch.c
@@ -204,7 +204,10 @@ main (int argc, char **argv)
 
     init_output (&outstate);
     if (outfile)
-      outstate.ofp = open_outfile (outfile);
+      {
+        outstate.ofp = open_outfile (outfile);
+        read_only_behavior = RO_IGNORE;
+      }
 
     /* Make sure we clean up in case of disaster.  */
     init_signals ();
diff --git a/tests/read-only-files b/tests/read-only-files
index b66ddb9..9f6bf7c 100644
--- a/tests/read-only-files
+++ b/tests/read-only-files
@@ -67,3 +67,8 @@ check 'patch -f -p0 --read-only=ignore < f.diff || echo "Status: $?"' <<EOF
 patching file f
 patching file f
 EOF
+
+check 'patch -o - f /dev/null || echo "Status: $?"' <<EOF
+patching file - (read from f)
+three
+EOF
-- 
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