Retrieve disk information

[sagitsofan]

• Version: v1.30.1
• Platform: Both

Inside Node there is no api to get the disk information, for example: total, used & available storage on a specific disk.

We would like that in Libuv you will add this feature, and in Node we will expose it inside the fs api - https://nodejs.org/api/fs.html
Desirable implementation code on Node:

const diskInfo = fs.diskInfoSync("C:")

diskInfo.total - disk total size.
diskInfo.used - how much of the drive is used.
diskInfo.available - how much free space have left.

nodejs/node#10745

[cjihrig]

@libuv/collaborators what do you think? The original request from Node is for something like statvfs(3). If we implement it in libuv, I believe it will be a little different because of Windows. If we want to add it to libuv, I'm OK with doing the work.

[bnoordhuis]

I'm okay with adding it. One issue I see is that available on file systems supporting compression might be meaningless but that's not really a libuv issue if the data comes directly from the operating system.

You probably want statfs(2) instead of statvfs(3), the latter doesn't report all the relevant data.

[saghul]

+1. I guess we can have some uv_statfs_t which we fill-in as we can (on Windows specially).