How to get a removable disc type in drive

[Daring_T]

I am not seeing a way to see the disc's type.

I had some success on my linux computer with the command

Output:
udevadm info -q property /dev/cdrom

When a DVD is inserted, the output contains a line

Output:
ID_CDROM_MEDIA_DVD=1

When a CD is inserted, or an audio CD, there is a line

Output:
ID_CDROM_MEDIA_CD=1

When there is nothing in the CD drive, there is no ID_CDROM_MEDIA... line in the output. I don't have a blue ray disk to see what it does.

EDIT: after some tests, I was able to get the information with pyudev

import pyudev


def main():
    context = pyudev.Context()
    a = context.list_devices(sys_name="sr0")
    dev = next(iter(a))
    # print(dev)
    # print(dict(dev.properties))
    if dev.properties.get("ID_CDROM_MEDIA_CD", False):
        print("CD drive contains a CD")
    elif dev.properties.get("ID_CDROM_MEDIA_DVD", False):
        print("CD drive contains a DVD")


if __name__ == "__main__":
    main()

Output:
λ python paillasse/pf/cdrom.py
CD drive contains a DVD

It seems that for blue ray, the property is ID_CDROM_MEDIA_BD

Thanks Gribouillis for the code snippet, worked like a charm. I just need to figure out blue-ray's. Unfortunately dict(dev.properties) does not show or add an different var for blue-rays from what I can see. I need to do some more digging with udev rules and dd but I have ran out of time today. I will post if I find a solution for blue-rays.

Thanks both for your help,
Daring_T

Also here is what a blue-ray looks like with running dict(dev.properties):

Output:
{'CURRENT_TAGS': ':uaccess:systemd:seat:',
 'DEVLINKS': '/dev/disk/by-path/pci-0000:00:14.0-usb-0:4.4:1.0-scsi-0:0:0:0 '
             '/dev/disk/by-id/usb-ASUS_BW-16D1HT_20201230-0:0 '
             '/dev/disk/by-uuid/8cd94d0851963909 '
             '/dev/disk/by-label/INCREDIBLES_D2',
 'DEVNAME': '/dev/sr1',
 'DEVPATH': '/devices/pci0000:00/0000:00:14.0/usb3/3-4/3-4.4/3-4.4:1.0/host5/target5:0:0/5:0:0:0/block/sr1',
 'DEVTYPE': 'disk',
 'DISKSEQ': '82',
 'ID_BUS': 'usb',
 'ID_CDROM': '1',
 'ID_CDROM_BD': '1',
 'ID_CDROM_BD_R': '1',
 'ID_CDROM_BD_RE': '1',
 'ID_CDROM_BD_R_RRM': '1',
 'ID_CDROM_BD_R_SRM': '1',
 'ID_CDROM_CD': '1',
 'ID_CDROM_CD_R': '1',
 'ID_CDROM_CD_RW': '1',
 'ID_CDROM_DVD': '1',
 'ID_CDROM_DVD_PLUS_R': '1',
 'ID_CDROM_DVD_PLUS_RW': '1',
 'ID_CDROM_DVD_PLUS_R_DL': '1',
 'ID_CDROM_DVD_R': '1',
 'ID_CDROM_DVD_RAM': '1',
 'ID_CDROM_DVD_RW': '1',
 'ID_CDROM_DVD_RW_RO': '1',
 'ID_CDROM_DVD_RW_SEQ': '1',
 'ID_CDROM_DVD_R_DL': '1',
 'ID_CDROM_DVD_R_DL_JR': '1',
 'ID_CDROM_DVD_R_DL_SEQ': '1',
 'ID_CDROM_MEDIA': '1',
 'ID_CDROM_MEDIA_BD': '1',
 'ID_CDROM_MEDIA_SESSION_COUNT': '1',
 'ID_CDROM_MEDIA_STATE': 'complete',
 'ID_CDROM_MEDIA_TRACK_COUNT': '1',
 'ID_CDROM_MEDIA_TRACK_COUNT_DATA': '1',
 'ID_CDROM_MRW': '1',
 'ID_CDROM_MRW_W': '1',
 'ID_CDROM_RW_REMOVABLE': '1',
 'ID_FOR_SEAT': 'block-pci-0000_00_14_0-usb-0_4_4_1_0-scsi-0_0_0_0',
 'ID_FS_APPLICATION_ID': 'APPLICATION_ID',
 'ID_FS_LABEL': 'INCREDIBLES_D2',
 'ID_FS_LABEL_ENC': 'INCREDIBLES_D2',
 'ID_FS_LOGICAL_VOLUME_ID': 'INCREDIBLES_D2',
 'ID_FS_TYPE': 'udf',
 'ID_FS_USAGE': 'filesystem',
 'ID_FS_UUID': '8cd94d0851963909',
 'ID_FS_UUID_ENC': '8cd94d0851963909',
 'ID_FS_VERSION': '2.50',
 'ID_FS_VOLUME_ID': 'INCREDIBLES_D2',
 'ID_FS_VOLUME_SET_ID': '8CD94D0851963909_VOLUME_SET_ID',
 'ID_INSTANCE': '0:0',
 'ID_MODEL': 'BW-16D1HT',
 'ID_MODEL_ENC': 'BW-16D1HT\\x20\\x20\\x20\\x20\\x20\\x20\\x20',
 'ID_MODEL_ID': '0611',
 'ID_PATH': 'pci-0000:00:14.0-usb-0:4.4:1.0-scsi-0:0:0:0',
 'ID_PATH_TAG': 'pci-0000_00_14_0-usb-0_4_4_1_0-scsi-0_0_0_0',
 'ID_REVISION': '3.00',
 'ID_SERIAL': 'ASUS_BW-16D1HT_20201230-0:0',
 'ID_SERIAL_SHORT': '01234567',
 'ID_TYPE': 'cd',
 'ID_USB_DRIVER': 'usb-storage',
 'ID_USB_INTERFACES': ':080650:',
 'ID_USB_INTERFACE_NUM': '00',
 'ID_VENDOR': 'ASUS',
 'ID_VENDOR_ENC': 'ASUS\\x20\\x20\\x20\\x20',
 'ID_VENDOR_ID': '1f75',
 'MAJOR': '11',
 'MINOR': '1',
 'SUBSYSTEM': 'block',
 'SYSTEMD_MOUNT_DEVICE_BOUND': '1',
 'TAGS': ':uaccess:systemd:seat:',
 'USEC_INITIALIZED': '1989315471'}