MacPorts xcodebuild error



Error messages:

Warning: xcodebuild exists but failed to execute

Warning: All compilers are either blacklisted or unavailable; defaulting to first fallback option

Warning: Xcode does not appear to be installed; most ports will likely fail to build.

Solution:



MacPorts xcodebuild error by @sskaje: https://sskaje.me/2019/08/macports-xcodebuild-error/
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Unity Package Manager 协议分析



Unity Package Manager 的 Windows 版不认系统的证书设置，直接配置代理走 Charles Proxy 没法抓到请求的包。懒得去搭反向代理，直接使用 Charles Proxy 的 Map Remote 功能，在 manifest.json 里随便设置一个地址，用 Charles Proxy 修改请求到 https://packages.unity.com 上，就可以抓包了。

请求逻辑是这样的：

1 请求 /com.unity.package-manager.metadata ，官方地址 https://packages.unity.com/com.unity.package-manager.metadata

2 根据 1 的响应里的searchablePackages，拼接 https://packages.unity.com/{PACKAGE} 获取包信息，例如 https://packages.unity.com/com.unity.xiaomi

3 从 2 的响应里读取包下载地址，从 dist.tarball 里获取下载地址。例如 https://download.packages.unity.com/com.unity.xiaomi/-/com.unity.xiaomi-1.0.3.tgz

根据这个协议，自己写个服务端，甚至用nginx搭建一个，还是比较简单的。此外 nexus 是个好选择，不用处理 3 里域名的问题，具体看 https://sskaje.me/2019/08/sonatype-nexus-3-as-unity-package-mirror/



Unity Package Manager 协议分析 by @sskaje: https://sskaje.me/2019/08/unity-package-manager-%e5%8d%8f%e8%ae%ae%e5%88%86%e6%9e%90/
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Sonatype Nexus 3 as Unity Package Mirror



Unity Package Manager 使用了 npm 的协议，配置起来比较简单。安装好nexus 3之后，直接创建一个 npm 的 proxy，Remote Storage 设置成 https://packages.unity.com 就行。国内服务器有条件设置一个代理也好，毕竟unity 的服务器被墙的概率挺高的。

然而，有几个坑。

1 Unity Package Manager 启动的时候会发无数个 HEAD 请求，而 nexus 3 并不支持HEAD，直接返回了404，于是 UPM 里一片红色的报警，但是不影响安装。

2 UPM 不支持加密认证，所以要想使用本地的镜像仓库，或者用 nexus 来管理自己的包，只能开启匿名访问。而公司场景的 nexus，最好从比 http 更底层的方式控制访问，例如各层加 来源 IP 控制。官方说 2020.1 才会加认证的支持 https://forum.unity.com/threads/setup-for-scoped-registries-private-registries.573934/ 。

3 墙的问题太严重。



Sonatype Nexus 3 as Unity Package Mirror by @sskaje: https://sskaje.me/2019/08/sonatype-nexus-3-as-unity-package-mirror/
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MacOS VPN Auto Add Routes



I tested on macOS 10.14, L2TP VPN.

I connect to my office VPN to work remotely, but I don’t want to send all traffic to VPN interface. Usually, I open a Terminal.app and execute commands after VPN connected:

192.168.2.0/24 is address block used in my office, 192.168.100.1 is VPN gateway address.

It’s really inconvenient. But I have a new solution: networksetup.

Usage: networksetup -setadditionalroutes <networkservice> [ <dest> <mask> <gateway> ]*
        Set additional IPv4 routes associated with <networkservice>
        by specifying one or more [ <dest> <mask> <gateway> ] tuples.
        Remove additional routes by specifying no arguments.
        If <gateway> is “”, the route is direct to the interface

First, find your service name.

Find your VPN connection name, in my case ‘My Office’.

If you have multiple route entries to add,

L2TP is a Point-to-Point VPN, the gateway address is not that important, that’s why I use “” instead of 192.168.100.1.



MacOS VPN Auto Add Routes by @sskaje: https://sskaje.me/2019/04/macos-vpn-auto-add-routes/
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