Storage mangment API: disks infos

[christophehenry]

The problem

Rel: YunoHost/issues#1823.
Add API for getting infos on hard drives.

[christophehenry]

Ok I think this is a good first step. Here is an exemple of the result this produces:

{
    "sda": {
        "devname": "/dev/sda",
        "model": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "serial": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "size": xxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
        "links": [
            "/dev/disk/by-diskseq/1",
            "/dev/disk/by-id/ata-xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            "/dev/disk/by-id/wwn-xxxxxxxxxxxxxxxxxxxxxxxx",
            "/dev/disk/by-path/pci-0000:01:00.1-ata-1",
            "/dev/disk/by-path/pci-0000:01:00.1-ata-1.0"
        ],
        "partitions": {
            "sda1": {
                "devname": "/dev/sda",
                "filesystem": "btrfs",
                "encrypted": true,
                "mountpoint": "/home"
            }
        }
    },
    "sdb": {
        "devname": "/dev/sdb",
        "model": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "serial": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
        "size": xxxxxxxxxxxxxxxxxxxxxxxxxxxxx,
        "links": [
            "/dev/disk/by-diskseq/2",
            "/dev/disk/by-id/ata-xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            "/dev/disk/by-id/wwn-xxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
            "/dev/disk/by-path/pci-0000:0a:00.0-ata-6",
            "/dev/disk/by-path/pci-0000:0a:00.0-ata-6.0"
        ],
        "partitions": {
            "sdb1": {
                "devname": "/dev/sdb",
                "filesystem": "vfat",
                "encrypted": false,
                "mountpoint": "/boot/efi"
            },
            "sdb2": {
                "devname": "/dev/sdb",
                "filesystem": "ext4",
                "encrypted": false,
                "mountpoint": "/boot"
            },
            "sdb3": {
                "devname": "/dev/sdb",
                "filesystem": "btrfs",
                "encrypted": true,
                "mountpoint": "/"
            }
        }
    }
}

In a future PR, I'd like to add the device type (HDD, SSD, …) and RPM for HDDs. I don't really know how to do that. TrueNAS does it by using its own library. In the meantime, this is ready for review.

[christophehenry]

This method detects LUKS partitions but I'm not sure it does not detect other unecrypted partitions, like LVM. If someone with more system knowlege than me could check this.

[christophehenry]

I could use pyparted here but this needs sufficient rights. If I'm not mistaken, yunohost-api is running as root, so this shouldn't be an issue, right?

[alexAubin]

yes

[christophehenry]

Turns out this solution detects LVM (non-LUKS) partitions as encrypted. And I can't figure out how to retrieve FS with pyparted. I don't know how gparted and KDE partition manager detect the partition filesystem.