From 646c3423dd580aebb677d9a3fe0ed26f74f97e31 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Mon, 20 May 2019 22:43:10 +0200
Subject: fileio: set group of backup file

Restores code removed in #9709.

uv_fs_copyfile() copies the perm bits but not the group name.
https://github.com/libuv/libuv/pull/1547

ref #9709
ref #8288
---
 src/nvim/fileio.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/nvim/fileio.c')

diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index 55463bdf30..15d7a885d5 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -2868,6 +2868,23 @@ buf_write (
           /* remove old backup, if present */
           os_remove((char *)backup);
 
+          // set file protection same as original file, but
+          // strip s-bit.
+          (void)os_setperm((const char *)backup, perm & 0777);
+
+#ifdef UNIX
+          //
+          // Try to set the group of the backup same as the original file. If
+          // this fails, set the protection bits for the group same as the
+          // protection bits for others.
+          //
+          if (file_info_new.stat.st_gid != file_info_old.stat.st_gid
+              && os_chown((char *)backup, -1, file_info_old.stat.st_gid) != 0) {
+            os_setperm((const char *)backup,
+                       (perm & 0707) | ((perm & 07) << 3));
+          }
+#endif
+
           // copy the file
           if (os_copy((char *)fname, (char *)backup, UV_FS_COPYFILE_FICLONE)
               != 0) {
-- 
cgit