From ceffc5bc20c1ab16c4d02e1d3ae8fcfb65557797 Mon Sep 17 00:00:00 2001
From: "Jay Freeman (saurik)" <saurik@saurik.com>
Date: Sun, 29 Jan 2017 01:11:28 -0800
Subject: Try to protect firmware.sh against reentrant bugs.

---
 Library/firmware.sh | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Library/firmware.sh b/Library/firmware.sh
index afaae9a..d2f89eb 100755
--- a/Library/firmware.sh
+++ b/Library/firmware.sh
@@ -49,6 +49,12 @@ EOF
 }
 # }}}
 
+before=$(stat -c '%i-%Y' status)
+
+output=$(mktemp status-tmp.XXXXXX)
+xxxxxx=${output##status-tmp.}
+rm -f status-tmp.!("${xxxxxx}")
+
 {
 
 # Delete Old Packages {{{
@@ -135,9 +141,11 @@ EOF
 
     pseudo "cy+lib.corefoundation" "$(/usr/libexec/cydia/cfversion)" "virtual corefoundation dependency"
 
-} >"${status}"_
+} >"${output}"
 
-mv -f "${status}"{_,}
+# XXX: this is a poor replacement for flock
+test "${before}" = "$(stat -c '%i-%Y' status)"
+mv -f "${output}" "${status}"
 
 if [[ ${cpu} == arm || ${cpu} == arm64 ]]; then
     if [[ ! -h /User && -d /User ]]; then
-- 
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