From 0be03e8056755deaaf1492fa1df38907eade690e Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Fri, 25 May 2018 09:07:39 +0200
Subject: verbose_flock new: it calls flock and reports about blocking
 processes on error

---
 lib/common-functions | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

(limited to 'lib/common-functions')

diff --git a/lib/common-functions b/lib/common-functions
index 4224831..b152f53 100755
--- a/lib/common-functions
+++ b/lib/common-functions
@@ -719,3 +719,18 @@ calculate_script_checksum() {
     sha512sum | \
     awk '{print $1}'
 }
+
+# verbose_flock
+# flock wrapper with some informational output on error
+verbose_flock() {
+  local err=0
+  flock "$@" || {
+    err=$?
+    lsof "/proc/$$/fd/$(
+      printf '%s\n' "$@" | \
+        grep -vm1 '^-'
+    )" || true
+    printf 'FYI: I am %s.\n' "$$"
+    return ${err}
+  }
+}
-- 
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