Port `mmc-tool` by skr4n · Pull Request #25 · libcdio/cdio-rust

skr4n · 2026-08-03T13:35:59Z

This PR adds the mmc-tool CLI utility in libcdio-cli.

The following options have been omitted in the port:
-b, --blocksize: The implementation was found to be incorrect.
-C, --drive-cap: Used a mode page that has been deprecated since MMC-4.
-S, --speed-X: Removed in favor of -S, --speed (without the 'X', in KB/s).

This option has been modified and fixed:
-i, --idle: The implementation was found to be incorrect. It has been replaced with -s, --standby.

Also, adds a new method in libcdio-rs:

set_power_state(): Puts the drive into the given power state (such as idle, standby, etc).

rocky · 2026-08-03T13:55:25Z

+pub struct Cli {
+    /// Show debugging information (1 = Error, 2 = Warn, 3 = Info, 4 = Debug)
+    #[arg(
+        default_value = "2",


default_value = "2" doesn't seem to be working:

$ ./mmc-tool-rs -d -c error: a value is required for '--debug <LEVEL>' but none was supplied For more information, try '--help'. $ ./mmc-tool-rs --help libcdio-cli version 0.1.0 .. Options: -d, --debug <LEVEL> Show debugging information (1 = Error, 2 = Warn, 3 = Info, 4 = Debug) [default: 2]

The default value is used when the option is not provided.

On a side note for later, I think using an env variable is more appropriate to accept log levels, rather than a dedicated user-facing option.
Example:
LOG_LEVEL=debug mmc-tool --close-tray
instead of
mmc-tool -d4 --close-tray

rocky · 2026-08-03T13:56:04Z

Overall, I like. Much needed!

rocky · 2026-08-03T14:05:22Z

When I run the --speed option, I am seeing nothing.

Here is a log:

$ target/debug/mmc-tool-rs -S 65535
# No output
$ target/debug/mmc-tool-rs -d 4 -S 65535
2026-08-03T13:59:10.154687Z DEBUG libcdio_rs::logging: Trying driver AIX
2026-08-03T13:59:10.154719Z DEBUG libcdio_rs::logging: Trying driver FreeBSD
2026-08-03T13:59:10.154727Z DEBUG libcdio_rs::logging: Trying driver NetBSD
2026-08-03T13:59:10.154735Z DEBUG libcdio_rs::logging: Trying driver GNU/Linux
2026-08-03T13:59:10.174783Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:59:10.185566Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
$

Is this expected?

I should have mentioned before, but in the tests I am consistently seeing MODE_SENSE(6) and READ_TOC when running tests:

---- mmc::get_config::tests::features stdout ----
2026-08-03T13:16:19.927909Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:19.938583Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

---- mmc::get_event_status::tests::busy_status stdout ----
2026-08-03T13:16:19.985306Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:19.995942Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533577Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Ok(BusyStatus { event: None, state: NotBusy, busy_time: None })

---- mmc::get_event_status::tests::external_status stdout ----
2026-08-03T13:16:20.028268Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.038835Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533604Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Ok(ExternalRequestStatus { event: None, state: Ready, request: None })

---- mmc::get_event_status::tests::media_status stdout ----
2026-08-03T13:16:20.081197Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.092011Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533680Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Ok(MediaStatus { event: None, state: MediaState(MediaPresent), start_slot: 0, end_slot: 0 })

---- mmc::get_event_status::tests::is_tray_open stdout ----
2026-08-03T13:16:20.134301Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.144740Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533710Z  INFO libcdio_rs::mmc::get_event_status::tests: is_tray_open=Ok(false)

---- mmc::get_event_status::tests::operational_status stdout ----
2026-08-03T13:16:20.187115Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.197761Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533739Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Ok(OperationalStatus { event: None, persistent_prevent: false })

---- mmc::get_event_status::tests::multihost_status stdout ----
2026-08-03T13:16:20.240200Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.251011Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533775Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Err(EventNotSupported(EventClass(MultiHost)))

---- mmc::get_event_status::tests::supported_events stdout ----
2026-08-03T13:16:20.346364Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.356690Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

---- mmc::get_event_status::tests::power_status stdout ----
2026-08-03T13:16:20.293108Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.303701Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533819Z  INFO libcdio_rs::mmc::get_event_status::tests: status=Ok(PowerStatus { event: None, state: Standby })

---- mmc::read_disc_info::tests::is_disc_erasable stdout ----
2026-08-03T13:16:20.399266Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.409764Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533888Z  INFO libcdio_rs::mmc::read_disc_info::tests: is_disc_erasable=false

---- mmc::inquiry::tests::hardware_identifiers stdout ----
2026-08-03T13:16:20.452314Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.462996Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.533917Z  INFO libcdio_rs::mmc::inquiry::tests: hardware_identifiers=HardwareIdentifiers { product: "BD-RW   BDR-UD02", vendor: "PIONEER", revision: "1.00" }

---- mmc::read_subchannel::tests::audio_status stdout ----
2026-08-03T13:16:20.496359Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.505969Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.584017Z  INFO libcdio_rs::mmc::read_subchannel::tests: audio_status=Ok(NoStatus)

---- mmc::read_subchannel::tests::cd_current_position stdout ----
2026-08-03T13:16:20.573115Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.583934Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.117044Z  INFO libcdio_rs::mmc::read_subchannel::tests: cd_current_position=CdCurrentPosition { track: 1, index: 1, absolute_position: TimePosition { hour: 0, minute: 0, second: 3, frame: 66 }, relative_position: TimePosition { hour: 0, minute: 0, second: 1, frame: 66 } }

---- mmc::read_subchannel::tests::isrc stdout ----
2026-08-03T13:16:20.636297Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.646970Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.149863Z  INFO libcdio_rs::mmc::read_subchannel::tests: isrc=Some("000000000000")

---- mmc::tests::level stdout ----
2026-08-03T13:16:20.689398Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.699651Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:20.727644Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

---- mmc::tests::sense_data stdout ----
2026-08-03T13:16:21.106660Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:21.116953Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.149782Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command READ TOC (0x43) failed:
	Input/output error
2026-08-03T13:16:21.149878Z  INFO libcdio_rs::mmc::tests: sense_data=MmcSenseData { sense_key: IllegalRequest, asc: 36, ascq: 0, ili: false, csi: [0, 0, 0, 0], fruc: 0, sks: [204, 0, 1], asb: [0, 0, 0, 0, 0, 0, 81, 0, 0, 0, 0, 0, 0, 0, 170, 138, 28, 251, 5, 0, 0, 0, 47, 4, 113, 192, 237, 162, 242, 189, 38, 0, 0, 0, 0, 0, 0, 0, 115, 119, 172, 192, 177, 95, 0, 0] }

---- mmc::read_toc::tests::cd_text stdout ----
2026-08-03T13:16:20.755237Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.765868Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.150072Z  INFO libcdio_rs::mmc::read_toc::tests: cd_text=[128, 0, 0, 0, 74, 111, 105, 110, 32, 117, 115, 32, 110, 111, 119, 32, 75, 67, 128, 0, 1, 12, 119, 101, 32, 104, 97, 118, 101, 32, 116, 104, 101, 32, 16, 228, 128, 0, 2, 15, 115, 111, 102, 116, 119, 97, 114, 101, 0, 83, 111, 102, 179, 227, 128, 1, 3, 3, 116, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 146, 16, 129, 0, 4, 0, 82, 105, 99, 104, 97, 114, 100, 32, 83, 116, 97, 108, 241, 101, 129, 0, 5, 12, 108, 109, 97, 110, 0, 82, 105, 99, 104, 97, 114, 100, 64, 249, 129, 1, 6, 7, 32, 83, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55, 139, 143, 0, 7, 0, 0, 1, 1, 0, 4, 3, 0, 0, 0, 0, 0, 0, 158, 113, 143, 1, 8, 0, 0, 0, 0, 0, 0, 0, 0, 3, 9, 0, 0, 0, 214, 166, 143, 2, 9, 0, 0, 0, 0, 0, 9, 0, 0, 0, 0, 0, 0, 0, 10, 78, 0, 0] len=182

---- mmc::read_subchannel::tests::media_catalog_number stdout ----
2026-08-03T13:16:20.813415Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.824048Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.150258Z  INFO libcdio_rs::mmc::read_subchannel::tests: mcn=Some("0000010271955")

---- mmc::tests::with_device stdout ----
2026-08-03T13:16:20.902200Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.909966Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

---- mmc::read_toc::tests::cd_type stdout ----
2026-08-03T13:16:20.866440Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.876982Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.150357Z  INFO libcdio_rs::mmc::read_toc::tests: cd_type=CddaOrCdData

---- mmc::read_toc::tests::last_sector stdout ----
2026-08-03T13:16:20.947030Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:20.957809Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error
2026-08-03T13:16:21.150495Z  INFO libcdio_rs::mmc::read_toc::tests: last_sector=301

---- mmc::test_unit_ready::tests::test_unit_ready stdout ----
2026-08-03T13:16:21.000190Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:21.010952Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

---- mmc::set_cd_speed::tests::set_cd_speed stdout ----
2026-08-03T13:16:21.054390Z  INFO libcdio_rs::logging: found driver GNU/Linux
2026-08-03T13:16:21.063881Z  INFO libcdio_rs::logging: ioctl CDROM_SEND_PACKET for command MODE SENSE (6) (0x1a) failed:
	Input/output error

skr4n · 2026-08-03T14:13:20Z

When I run the --speed option, I am seeing nothing.

If the command has succeeded, it returns nothing, keeping things POSIX-like.
To verify the speed change, for now, you may use the wodim tool.
sudo wodim dev=/dev/cdrom -prcap

I do a plan to add an option to display the current speeds.
However, that requires implementing a new MMC command (not present in libcdio C), thus out of scope for the current project.
I shall be adding it once we're done with everything in the project scope (CI, static linking).

rocky · 2026-08-03T14:23:03Z

When I run the --speed option, I am seeing nothing.

If the command has succeeded, it returns nothing, keeping things POSIX-like. To verify the speed change, for now, you may use the wodim tool. sudo wodim dev=/dev/cdrom -prcap

I don't see where I see what the current speed is set to. Where is it in the output below?

Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : 'PIONEER '
Identification : 'BD-RW   BDR-UD02'
Revision       : '1.00'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.

Drive capabilities, per MMC-3 page 2A:

  Does read CD-R media
  Does write CD-R media
  Does read CD-RW media
  Does write CD-RW media
  Does read DVD-ROM media
  Does read DVD-R media
  Does write DVD-R media
  Does read DVD-RAM media
  Does write DVD-RAM media
  Does support test writing

  Does read Mode 2 Form 1 blocks
  Does read Mode 2 Form 2 blocks
  Does read digital audio blocks
  Does restart non-streamed digital audio reads accurately
  Does support Buffer-Underrun-Free recording
  Does read multi-session CDs
  Does read fixed-packet CD media using Method 2
  Does not read CD bar code
  Does not read R-W subcode information
  Does read raw P-W subcode data from lead in
  Does return CD media catalog number
  Does return CD ISRC information
  Does not support C2 error pointers
  Does not deliver composite A/V data

  Does play audio CDs
  Number of volume control levels: 256
  Does support individual volume control setting for each channel
  Does support independent mute setting for each channel
  Does not support digital output on port 1
  Does not support digital output on port 2

  Loading mechanism type: tray
  Does support ejection of CD via START/STOP command
  Does not lock media on power up via prevent jumper
  Does allow media to be locked in the drive via PREVENT/ALLOW command
  Is currently in a media-locked state
  Does not support changing side of disk
  Does not have load-empty-slot-in-changer feature
  Does not support Individual Disk Present feature

  Maximum read  speed:  4233 kB/s (CD  24x, DVD  3x)
  Current read  speed:  4233 kB/s (CD  24x, DVD  3x)
  Maximum write speed:  4234 kB/s (CD  24x, DVD  3x)
  Current write speed:  4234 kB/s (CD  24x, DVD  3x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 4000
  Copy management revision supported: 1
  Number of supported write speeds: 5
  Write speed # 0:  4234 kB/s CLV/PCAV (CD  24x, DVD  3x)
  Write speed # 1:  3528 kB/s CLV/PCAV (CD  20x, DVD  2x)
  Write speed # 2:  2823 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 3:  1764 kB/s CLV/PCAV (CD  10x, DVD  1x)
  Write speed # 4:   706 kB/s CLV/PCAV (CD   4x, DVD  0x)

Supported CD-RW media types according to MMC-4 feature 0x37:
  Does write multi speed       CD-RW media
  Does write high  speed       CD-RW media
  Does write ultra high speed  CD-RW media
  Does not write ultra high speed+ CD-RW media

skr4n · 2026-08-03T14:25:44Z

  Maximum read  speed:  4233 kB/s (CD  24x, DVD  3x)
  Current read  speed:  4233 kB/s (CD  24x, DVD  3x)
  Maximum write speed:  4234 kB/s (CD  24x, DVD  3x)
  Current write speed:  4234 kB/s (CD  24x, DVD  3x)

See the 16th line from the last.

skr4n · 2026-08-03T14:31:27Z

I should have mentioned before, but in the tests I am consistently seeing MODE_SENSE(6) and READ_TOC when running tests:

Check if you're using a clean build of libcdio C, from master.

rocky · 2026-08-03T14:33:07Z

When I run the --speed option, I am seeing nothing.

If the command has succeeded, it returns nothing, keeping things POSIX-like. To verify the speed change, for now, you may use the wodim tool. sudo wodim dev=/dev/cdrom -prcap

This is useful information. We need to add it somewhere to the documentation for others.

I do a plan to add an option to display the current speeds. However, that requires implementing a new MMC command (not present in libcdio C), thus out of scope for the current project.

Noted.

I shall be adding it once we're done with everything in the project scope (CI, static linking).

Much appreciated!

rocky · 2026-08-03T15:10:17Z

I should have mentioned before, but in the tests I am consistently seeing MODE_SENSE(6) and READ_TOC when running tests:

Check if you're using a clean build of libcdio C, from master.

I am now certain I'm using the current master libcdio C branch. (I updated the version number in libcdio C in here and installed that and set SYSTEM_DEPS_* environment variables. I then did a cargo clean && cargo build.

I am still seeing MODE SENSE 6 failures and that READ_TOC failure. Using wodim, I am not seeing those failures.

I will check on another system with another CD drive.

rocky · 2026-08-03T15:42:15Z

I should have mentioned before, but in the tests I am consistently seeing MODE_SENSE(6) and READ_TOC when running tests:

Check if you're using a clean build of libcdio C, from master.

I am now certain I'm using the current master libcdio C branch. (I updated the version number in libcdio C in here and installed that and set SYSTEM_DEPS_* environment variables. I then did a cargo clean && cargo build.

I am still seeing MODE SENSE 6 failures and that READ_TOC failure. Using wodim, I am not seeing those failures.

I will check on another system with another CD drive.

For what it's worth, in libcdio C, running cd-drive -d4, I get a MODE SENSE failure as well.

skr4n added 6 commits August 3, 2026 18:56

cli: Add mmc-tool

5ca7565

cli/mmc-tool: Add eject and close tray

8b81062

lib/mmc: Add method to set power state

2b31b07

cli/mmc-tool: Add option to put the device into standby

b025eb6

cli/mmc-tool: Add options to get MCN and Hardware identifers

f778827

cli/mmc-tool: Add options to set drive speed

55b950a

rocky reviewed Aug 3, 2026

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Port `mmc-tool` - #25

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