From d7dd12edab0135de4b6690f94b93dc63b1ffaaef Mon Sep 17 00:00:00 2001
From: Tomoyasu Nojiri <68096132+t-nojiri@users.noreply.github.com>
Date: Fri, 5 Mar 2021 00:46:18 +0900
Subject: unifyfs: Fix strncpy build error of version 0.9.1 (#22066)

---
 var/spack/repos/builtin/packages/unifyfs/package.py           |  2 ++
 .../repos/builtin/packages/unifyfs/unifyfs-sysio.c.patch      | 11 +++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 var/spack/repos/builtin/packages/unifyfs/unifyfs-sysio.c.patch

diff --git a/var/spack/repos/builtin/packages/unifyfs/package.py b/var/spack/repos/builtin/packages/unifyfs/package.py
index df3c035e68..4b3f92945b 100644
--- a/var/spack/repos/builtin/packages/unifyfs/package.py
+++ b/var/spack/repos/builtin/packages/unifyfs/package.py
@@ -54,6 +54,8 @@ class Unifyfs(AutotoolsPackage):
     depends_on('gotcha@0.0.2', when='@:0.9.0')
     depends_on('leveldb', when='@:0.9.0')
 
+    patch('unifyfs-sysio.c.patch', when='@0.9.1')
+
     conflicts('^mercury~bmi')
     conflicts('^mercury~sm')
     # Known compatibility issues with ifort and xlf. Fixes coming.
diff --git a/var/spack/repos/builtin/packages/unifyfs/unifyfs-sysio.c.patch b/var/spack/repos/builtin/packages/unifyfs/unifyfs-sysio.c.patch
new file mode 100644
index 0000000000..99e2086b51
--- /dev/null
+++ b/var/spack/repos/builtin/packages/unifyfs/unifyfs-sysio.c.patch
@@ -0,0 +1,11 @@
+--- spack-src/client/src/unifyfs-sysio.c.bak	2020-12-03 09:04:41.197202000 +0900
++++ spack-src/client/src/unifyfs-sysio.c	2021-03-04 10:06:32.626989637 +0900
+@@ -245,7 +245,7 @@
+          * that is big enough */
+         buf = (char*) malloc(len);
+         if (buf != NULL) {
+-            strncpy(buf, unifyfs_cwd, len);
++            memcpy(buf, unifyfs_cwd, strlen(unifyfs_cwd));
+         } else {
+             errno = ENOMEM;
+         }
-- 
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