从 xcrun xctrace 列表设备获取输出

Question

在詹金斯管道上，我执行：

def devicesText = sh(script: "xcrun xctrace list devices", returnStdout: true)
printf devicesText

它有奇怪的行为，因为它在控制台上打印输出，但不将输出保存在变量中。控制台看起来像这样（id 已替换为XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX）：

+ xcrun xctrace list devices
== Devices ==
SAM Team - Build Server 2018 (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)

== Simulators ==
Apple Watch Series 5 - 40mm (7.0) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
Apple Watch Series 5 - 44mm (7.0) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPad (7th generation) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPad Air (3rd generation) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPad Pro (11-inch) (2nd generation) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPad Pro (12.9-inch) (4th generation) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPad Pro (9.7-inch) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 11 (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 11 Pro (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 11 Pro Max (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 6s (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 8 (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone 8 Plus (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
iPhone SE (2nd generation) (13.5) (XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX)
[Pipeline] echo

正如您所看到的，回显是空的，因为它没有复制到变量中。如何将输出保存在变量中？

（它曾经与已弃用的命令一起使用instruments -s devices）

Answer 1

以某种方式xcrun xctrace将输出打印到stderr.

因此，为了获取stderr日志，stdout只需将它们重定向到stdoutwith 2>&1。

->xcrun xctrace list devices 2>&1 | grep -oE 'iPhone.*?[^\(]+' | head -1 | awk '{$1=$1;print}'