vagrant box add metadata.json 执行报错的解决方案

$ vagrant box add metadata.json
==> box: Loading metadata for box 'metadata.json'
    box: URL: file://D:/BaiduNetdiskDownload/lc-homestead-8.2.1-2019112300/metad                                                                                                              ata.json
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

URL using bad/illegal format or missing URL


$ vagrant version
Installed Version: 2.2.15
Latest Version: 2.2.15

You're running an up-to-date version of Vagrant!

解决办法是 metadata.json 要使用 绝对路径。

$ vagrant box add /d/BaiduNetdiskDownload/lc-homestead-8.2.1-2019112300/metadata.json
==> box: Loading metadata for box 'D:/BaiduNetdiskDownload/lc-homestead-8.2.1-2019112300/metadata.json'
    box: URL: file:///D:/BaiduNetdiskDownload/lc-homestead-8.2.1-2019112300/metadata.json
==> box: Adding box 'lc/homestead' (v8.2.1) for provider: virtualbox
    box: Downloading: virtualbox.box
    box:
==> box: Successfully added box 'lc/homestead' (v8.2.1) for 'virtualbox'!