From d6a0cecab142f25e4a031a645c6ce510aab6c15d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=BD=D0=B0=D0=B1?= <nabijaczleweli@nabijaczleweli.xyz>
Date: Fri, 14 May 2021 04:17:31 +0200
Subject: [PATCH] zed-functions.sh: zed_lock(): don't truncate lock
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By appending instead of truncating, we can lock on any file (with write
permissions) instead of only dedicated lock files, since the locking
process itself no longer alters the file in any way

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12042
---
 cmd/zed/zed.d/zed-functions.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cmd/zed/zed.d/zed-functions.sh b/cmd/zed/zed.d/zed-functions.sh
index df35c48fdb..7dcd6b2d20 100644
--- a/cmd/zed/zed.d/zed-functions.sh
+++ b/cmd/zed/zed.d/zed-functions.sh
@@ -126,7 +126,7 @@ zed_lock()
 
     # Obtain a lock on the file bound to the given file descriptor.
     #
-    eval "exec ${fd}> '${lockfile}'"
+    eval "exec ${fd}>> '${lockfile}'"
     if ! err="$(flock --exclusive "${fd}" 2>&1)"; then
         zed_log_err "failed to lock \"${lockfile}\": ${err}"
     fi