Original revisions of the SAT (SCSI-ATA Translation) specification
required that all sense data be reported in Descriptor Format (72h).
Later revisions specifcally allow and account for sense data being
reported in Fixed Format (70h).
The current code checks for a Descriptor Format sense structure (0x72),
then looks specifically at the first byte of the first descriptor for the
ATA specific code 0x9, cross referencing it with the first byte which is
just a length field 0x0c (as a sanity check).
In the Fixed Format case(0x70), we can fall back to using the top-level
SCSI Sense data for the Additional Sense code (0x0) and then the
Additional Sense Code Qualifier (0x1d),
That identifies that the sense data is of the format associated with:
`ATA PASS THROUGH INFORMATION AVAILABLE`.
This fallback mechanism retains support for SATLs compliant with ANSI
INCITS 431-2007, and enables support for Fixed Format Sense data
enabled by SATLs with later revisions.
Glad to do so. This patch allows ata_id to export attributes correctly. I believe that any drive can potentially return information in this format on any SATL using the libata-scsi (the Linux builtin SATL), but in this particular case, it appears it is the SATL itself. Attaching the disk to the AHCI controller changes the behavior impacted here. (Not entirely surprisingly, SATLs are are pretty inconsistent).
Test:
This case specifically is an LSI SATL. I'll illustrate that without the patch, ata_id does not return
any output for a valid SATA drive but after the patch does.
1. Verify the device is ATA, by looking at the vpd page specific to ATA drives
```
root@machine:~# sg_vpd -p ai /dev/sdn
ATA information VPD page:
SAT Vendor identification: LSI
SAT Product identification: LSI SATL
SAT Product revision level: 0008
Device signature indicates SATA transport
ATA command IDENTIFY DEVICE response summary:
model: HGST HUH728080ALE604
serial number: ZZZZH3VX
firmware revision: A4GNW7J0
```
2. Look at what udev thinks of the disk, it says ID_BUS=scsi
ATA information says ID_MODEL should be HGST_HUH728080ALE604
udev says it is HGST_HUH728080AL (Missing E604, 4 bytes), and no ATA attributes are
populated.
```
root@machine:~# udevadm info -q all /dev/sdn
P: /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn
N: sdn
S: disk/by-id/scsi-35000cca23be1dc3c
S: disk/by-id/wwn-0x5000cca23be1dc3c
S: disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
E: DEVLINKS=/dev/disk/by-id/wwn-0x5000cca23be1dc3c /dev/disk/by-id/scsi-35000cca23be1dc3c /dev/disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
E: DEVNAME=/dev/sdn
E: DEVPATH=/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn
E: DEVTYPE=disk
E: ID_BUS=scsi
E: ID_MODEL=HGST_HUH728080AL
E: ID_MODEL_ENC=HGST\x20HUH728080AL
E: ID_PATH=pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
E: ID_PATH_TAG=pci-0000_05_00_0-sas-exp0x500605b0000272bf-phy11-lun-0
E: ID_REVISION=W7J0
E: ID_SCSI=1
E: ID_SCSI_SERIAL=ZZZZH3VX
E: ID_SERIAL=35000cca23be1dc3c
E: ID_SERIAL_SHORT=5000cca23be1dc3c
E: ID_TYPE=disk
E: ID_VENDOR=ATA
E: ID_VENDOR_ENC=ATA\x20\x20\x20\x20\x20
E: ID_WWN=0x5000cca23be1dc3c
E: ID_WWN_WITH_EXTENSION=0x5000cca23be1dc3c
E: MAJOR=8
E: MINOR=208
E: SUBSYSTEM=block
E: TAGS=:systemd:
```
3. Run ata_id (unpatched) (Outputs nothing, RC=2)
```
root@machine:~# strace -e ioctl /lib/udev/ata_id /dev/sdn -x
ioctl(3, SG_IO, {'Q', BSG_PROTOCOL_SCSI, BSG_SUB_PROTOCOL_SCSI_CMD, request[6]=[12, 00, 00, 00, 24, 00], request_tag=0, request_attr=0, request_priority=0, request_extra=0, max_response_len=32, dout_iovec_count=0, dout_xfer_len=0, din_iovec_count=0, din_xfer_len=36, timeout=30000, flags=0, usr_ptr=0, spare_in=0, dout[0]=NULL}) = -1 EINVAL (Invalid argument)
ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[6]=[12, 00, 00, 00, 24, 00], mx_sb_len=32, iovec_count=0, dxfer_len=36, timeout=30000, flags=0, data[36]=[00, 00, 06, 12, 45, 00, 00, 02, 41, 54, 41, 20, 20, 20, 20, 20, 48, 47, 53, 54, 20, 48, 55, 48, 37, 32, 38, 30, 38, 30, 41, 4c, ...], status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=1, info=0}) = 0
ioctl(3, SG_IO, {'Q', BSG_PROTOCOL_SCSI, BSG_SUB_PROTOCOL_SCSI_CMD, request[12]=[a1, 08, 2e, 00, 01, 00, 00, 00, 00, ec, 00, 00], request_tag=0, request_attr=0, request_priority=0, request_extra=0, max_response_len=32, dout_iovec_count=0, dout_xfer_len=0, din_iovec_count=0, din_xfer_len=512, timeout=30000, flags=0, usr_ptr=0, spare_in=0, dout[0]=NULL}) = -1 EINVAL (Invalid argument)
ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[12]=[a1, 08, 2e, 00, 01, 00, 00, 00, 00, ec, 00, 00], mx_sb_len=32, iovec_count=0, dxfer_len=512, timeout=30000, flags=0, data[0]=[], status=02, masked_status=01, sb[18]=[70, 00, 01, 00, 00, 00, 00, 0a, 00, 00, 00, 00, 00, 1d, 00, 00, 00, 00], host_status=0, driver_status=0x8, resid=512, duration=0, info=0x1}) = 0
ioctl(3, HDIO_GET_IDENTITY, 0x7ffe408f7590) = -1 EINVAL (Invalid argument)
+++ exited with 2 +++
```
Sense buffers visible with the strace:
`sb[18]=[70, 00, 01, 00, 00, 00, 00, 0a, 00, 00, 00, 00, 00, 1d, 00, 00, 00, 00]` is the important bit, see 70, 0a and 1d bytes
4. Run patched version: model is HGST_HUH728080ALE604 as expected, ATA attributes are
correctly populated.
```
root@machine:~# ./ata_id /dev/sdn -x
ID_ATA=1
ID_TYPE=disk
ID_BUS=ata
ID_MODEL=HGST_HUH728080ALE604
ID_MODEL_ENC=HGST\x20HUH728080ALE604\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
ID_REVISION=A4GNW7J0
ID_SERIAL=HGST_HUH728080ALE604_ZZZZH3VX
ID_SERIAL_SHORT=ZZZZH3VX
ID_ATA_WRITE_CACHE=1
ID_ATA_WRITE_CACHE_ENABLED=1
ID_ATA_FEATURE_SET_HPA=1
ID_ATA_FEATURE_SET_HPA_ENABLED=1
ID_ATA_FEATURE_SET_PM=1
ID_ATA_FEATURE_SET_PM_ENABLED=1
ID_ATA_FEATURE_SET_SECURITY=1
ID_ATA_FEATURE_SET_SECURITY_ENABLED=0
ID_ATA_FEATURE_SET_SECURITY_ERASE_UNIT_MIN=66522
ID_ATA_FEATURE_SET_SMART=1
ID_ATA_FEATURE_SET_SMART_ENABLED=1
ID_ATA_FEATURE_SET_PUIS=1
ID_ATA_FEATURE_SET_PUIS_ENABLED=0
ID_ATA_FEATURE_SET_APM=1
ID_ATA_FEATURE_SET_APM_ENABLED=1
ID_ATA_FEATURE_SET_APM_CURRENT_VALUE=254
ID_ATA_DOWNLOAD_MICROCODE=1
ID_ATA_SATA=1
ID_ATA_SATA_SIGNAL_RATE_GEN2=1
ID_ATA_SATA_SIGNAL_RATE_GEN1=1
ID_ATA_ROTATION_RATE_RPM=7200
ID_WWN=0x5000cca23be1dc3c
ID_WWN_WITH_EXTENSION=0x5000cca23be1dc3c
```
5. Drop it in place and verify: we see that ata_id does work.
```
root@hw1-b01left-2212a:~# udevadm test /block/sdn
<truncated>
GROUP 6 /lib/udev/rules.d/50-udev-default.rules:55
IMPORT 'ata_id --export /dev/sdn' /lib/udev/rules.d/60-persistent-storage.rules:33
starting 'ata_id --export /dev/sdn'
'ata_id --export /dev/sdn'(out) 'ID_ATA=1'
'ata_id --export /dev/sdn'(out) 'ID_TYPE=disk'
'ata_id --export /dev/sdn'(out) 'ID_BUS=ata'
'ata_id --export /dev/sdn'(out) 'ID_MODEL=HGST_HUH728080ALE604'
'ata_id --export /dev/sdn'(out) 'ID_MODEL_ENC=HGST\x20HUH728080ALE604\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20'
'ata_id --export /dev/sdn'(out) 'ID_REVISION=A4GNW7J0'
'ata_id --export /dev/sdn'(out) 'ID_SERIAL=HGST_HUH728080ALE604_ZZZZH3VX'
'ata_id --export /dev/sdn'(out) 'ID_SERIAL_SHORT=ZZZZH3VX'
'ata_id --export /dev/sdn'(out) 'ID_ATA_WRITE_CACHE=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_WRITE_CACHE_ENABLED=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_HPA=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_HPA_ENABLED=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_PM=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_PM_ENABLED=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_SECURITY=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_SECURITY_ENABLED=0'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_SECURITY_ERASE_UNIT_MIN=66522'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_SMART=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_SMART_ENABLED=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_PUIS=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_PUIS_ENABLED=0'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_APM=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_APM_ENABLED=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_FEATURE_SET_APM_CURRENT_VALUE=254'
'ata_id --export /dev/sdn'(out) 'ID_ATA_DOWNLOAD_MICROCODE=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_SATA=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_SATA_SIGNAL_RATE_GEN2=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_SATA_SIGNAL_RATE_GEN1=1'
'ata_id --export /dev/sdn'(out) 'ID_ATA_ROTATION_RATE_RPM=7200'
'ata_id --export /dev/sdn'(out) 'ID_WWN=0x5000cca23be1dc3c'
'ata_id --export /dev/sdn'(out) 'ID_WWN_WITH_EXTENSION=0x5000cca23be1dc3c'
Process 'ata_id --export /dev/sdn' succeeded.
LINK 'disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX' /lib/udev/rules.d/60-persistent-storage.rules:47
IMPORT builtin 'path_id' /lib/udev/rules.d/60-persistent-storage.rules:65
LINK 'disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0' /lib/udev/rules.d/60-persistent-storage.rules:66
IMPORT builtin 'blkid' /lib/udev/rules.d/60-persistent-storage.rules:81
probe /dev/sdn raid offset=0
LINK 'disk/by-id/wwn-0x5000cca23be1dc3c' /lib/udev/rules.d/60-persistent-storage.rules:88
RUN '/usr/lib/python-dsnet-appliance/hotplug disk udev-disk-add' /etc/udev/rules.d/99-appliance-hotplug.rules:1
update old name, '/dev/disk/by-id/scsi-35000cca23be1dc3c' no longer belonging to '/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn'
no reference left, remove '/dev/disk/by-id/scsi-35000cca23be1dc3c'
handling device node '/dev/sdn', devnum=b8:208, mode=0660, uid=0, gid=6
preserve permissions /dev/sdn, 060660, uid=0, gid=6
preserve already existing symlink '/dev/block/8:208' to '../sdn'
creating link '/dev/disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX' to '/dev/sdn'
creating symlink '/dev/disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX' to '../../sdn'
found 'b8:208' claiming '/run/udev/links/\x2fdisk\x2fby-id\x2fwwn-0x5000cca23be1dc3c'
creating link '/dev/disk/by-id/wwn-0x5000cca23be1dc3c' to '/dev/sdn'
preserve already existing symlink '/dev/disk/by-id/wwn-0x5000cca23be1dc3c' to '../../sdn'
found 'b8:208' claiming '/run/udev/links/\x2fdisk\x2fby-path\x2fpci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0'
creating link '/dev/disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0' to '/dev/sdn'
preserve already existing symlink '/dev/disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0' to '../../sdn'
created db file '/run/udev/data/b8:208' for '/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn'
ACTION=add
DEVLINKS=/dev/disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0 /dev/disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX /dev/disk/by-id/wwn-0x5000cca23be1dc3c
DEVNAME=/dev/sdn
DEVPATH=/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn
DEVTYPE=disk
ID_ATA=1
ID_ATA_DOWNLOAD_MICROCODE=1
ID_ATA_FEATURE_SET_APM=1
ID_ATA_FEATURE_SET_APM_CURRENT_VALUE=254
ID_ATA_FEATURE_SET_APM_ENABLED=1
ID_ATA_FEATURE_SET_HPA=1
ID_ATA_FEATURE_SET_HPA_ENABLED=1
ID_ATA_FEATURE_SET_PM=1
ID_ATA_FEATURE_SET_PM_ENABLED=1
ID_ATA_FEATURE_SET_PUIS=1
ID_ATA_FEATURE_SET_PUIS_ENABLED=0
ID_ATA_FEATURE_SET_SECURITY=1
ID_ATA_FEATURE_SET_SECURITY_ENABLED=0
ID_ATA_FEATURE_SET_SECURITY_ERASE_UNIT_MIN=66522
ID_ATA_FEATURE_SET_SMART=1
ID_ATA_FEATURE_SET_SMART_ENABLED=1
ID_ATA_ROTATION_RATE_RPM=7200
ID_ATA_SATA=1
ID_ATA_SATA_SIGNAL_RATE_GEN1=1
ID_ATA_SATA_SIGNAL_RATE_GEN2=1
ID_ATA_WRITE_CACHE=1
ID_ATA_WRITE_CACHE_ENABLED=1
ID_BUS=ata
ID_MODEL=HGST_HUH728080ALE604
ID_MODEL_ENC=HGST\x20HUH728080ALE604\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
ID_PATH=pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
ID_PATH_TAG=pci-0000_05_00_0-sas-exp0x500605b0000272bf-phy11-lun-0
ID_REVISION=A4GNW7J0
ID_SERIAL=HGST_HUH728080ALE604_ZZZZH3VX
ID_SERIAL_SHORT=ZZZZH3VX
ID_TYPE=disk
ID_WWN=0x5000cca23be1dc3c
ID_WWN_WITH_EXTENSION=0x5000cca23be1dc3c
MAJOR=8
MINOR=208
SUBSYSTEM=block
TAGS=:systemd:
USEC_INITIALIZED=6055690
run: '/usr/lib/python-dsnet-appliance/hotplug disk udev-disk-add'
Unload module index
Unloaded link configuration context.
```
6. Query just to double check: (ID_BUS=ata, model correct, etc).
```
root@machine:~# udevadm info /dev/sdn
P: /devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn
N: sdn
S: disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX
S: disk/by-id/wwn-0x5000cca23be1dc3c
S: disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
E: DEVLINKS=/dev/disk/by-id/wwn-0x5000cca23be1dc3c /dev/disk/by-path/pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0 /dev/disk/by-id/ata-HGST_HUH728080ALE604_ZZZZH3VX
E: DEVNAME=/dev/sdn
E: DEVPATH=/devices/pci0000:00/0000:00:03.0/0000:05:00.0/host2/port-2:0/expander-2:0/port-2:0:11/end_device-2:0:11/target2:0:11/2:0:11:0/block/sdn
E: DEVTYPE=disk
E: ID_ATA=1
E: ID_ATA_DOWNLOAD_MICROCODE=1
E: ID_ATA_FEATURE_SET_APM=1
E: ID_ATA_FEATURE_SET_APM_CURRENT_VALUE=254
E: ID_ATA_FEATURE_SET_APM_ENABLED=1
E: ID_ATA_FEATURE_SET_HPA=1
E: ID_ATA_FEATURE_SET_HPA_ENABLED=1
E: ID_ATA_FEATURE_SET_PM=1
E: ID_ATA_FEATURE_SET_PM_ENABLED=1
E: ID_ATA_FEATURE_SET_PUIS=1
E: ID_ATA_FEATURE_SET_PUIS_ENABLED=0
E: ID_ATA_FEATURE_SET_SECURITY=1
E: ID_ATA_FEATURE_SET_SECURITY_ENABLED=0
E: ID_ATA_FEATURE_SET_SECURITY_ERASE_UNIT_MIN=66522
E: ID_ATA_FEATURE_SET_SMART=1
E: ID_ATA_FEATURE_SET_SMART_ENABLED=1
E: ID_ATA_ROTATION_RATE_RPM=7200
E: ID_ATA_SATA=1
E: ID_ATA_SATA_SIGNAL_RATE_GEN1=1
E: ID_ATA_SATA_SIGNAL_RATE_GEN2=1
E: ID_ATA_WRITE_CACHE=1
E: ID_ATA_WRITE_CACHE_ENABLED=1
E: ID_BUS=ata
E: ID_MODEL=HGST_HUH728080ALE604
E: ID_MODEL_ENC=HGST\x20HUH728080ALE604\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_PATH=pci-0000:05:00.0-sas-exp0x500605b0000272bf-phy11-lun-0
E: ID_PATH_TAG=pci-0000_05_00_0-sas-exp0x500605b0000272bf-phy11-lun-0
E: ID_REVISION=A4GNW7J0
E: ID_SERIAL=HGST_HUH728080ALE604_ZZZZH3VX
E: ID_SERIAL_SHORT=ZZZZH3VX
E: ID_TYPE=disk
E: ID_WWN=0x5000cca23be1dc3c
E: ID_WWN_WITH_EXTENSION=0x5000cca23be1dc3c
E: MAJOR=8
E: MINOR=208
E: SUBSYSTEM=block
E: TAGS=:systemd:
E: USEC_INITIALIZED=6055690
```
If I install the same disk into a machine using an ATA driver, this behavior changes:
```
root@machine2:~# sg_vpd -p ai /dev/sdb
ATA information VPD page:
SAT Vendor identification: linux
SAT Product identification: libata
SAT Product revision level: 3.00
Device signature indicates SATA transport
ATA command IDENTIFY DEVICE response summary:
model: HGST HUH728080ALE604
serial number: ZZZZH3VX
firmware revision: A4GNW7J0
root@machine-2:~# /lib/udev/ata_id -x /dev/sdb
ID_ATA=1
ID_TYPE=disk
ID_BUS=ata
ID_MODEL=HGST_HUH728080ALE604
ID_MODEL_ENC=HGST\x20HUH728080ALE604\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
ID_REVISION=A4GNW7J0
<truncated>
```
The ChromeOS ecosystem has a large amount of testing, both automated
and manual across devices including measurement of power regressions.
It's safe to assume that any of these devices will handle USB
auto-suspend appropriately. Use the script from ChromeOS
https://chromium.googlesource.com/chromiumos/platform2/+/master/power_manager/udev/gen_autosuspend_rules.py
to generate udev rules at build time.
This script in systemd `tools/chromeos/gen_autosuspend_rules.py` should be kept
in sync with the ChromeOS version of the script.
Manually added autosuspend devices should be placed in the new
template `rules/61-autosuspend-manual.rules`
Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
The force field of the Item struct is used to indicate
force creation or appending in different context. This
change renames the field to append_or_force to improve
readability.
PID1 may modified the environment passed by the kernel when it starts
running. Commit 9d48671c62 unset $HOME for
example.
In case PID1 is going to switch to a new root and execute a new system manager
which is not systemd, we should restore the original environment as the new
manager might expect some variables to be set by default (more specifically
$HOME).
This is the most basic consumer of the new systemd-vs-kernel checker,
both acting as a reasonable standalone exerciser of the code, and also
as a way for easy inspection of deviations from systemd internal state.
We currently don't have any mitigations against another privileged user
on the system messing with the cgroup hierarchy, bringing the system out
of line with what we've set in systemd. We also don't have any real way
to surface this to the user (we do have logs, but you have to know to
look in the first place).
There are a few possible solutions:
1. Maintaining our own cgroup tree with the new fsopen API and having a
read-only copy for everyone else. However, there are some
complications on this front, and this may be infeasible in some
environments. I'd rate this as a longer term effort that's tangential
to this patch.
2. Actively checking for changes with {fa,i}notify and changing them
back afterwards to match our configuration again. This is also
possible, but it's also good to have a way to do passive monitoring
of the situation without taking hard action. Also, currently daemons
like senpai do actually need to modify the tree behind systemd's
back (although hopefully this should be more integrated soon).
This patch implements another option, where one can, on demand, monitor
deviations in cgroup memory configuration from systemd's internal state.
Currently the only consumer is `systemd-analyze dump`, but the interface
is generic enough that it can also be exposed elsewhere later (for
example, over D-Bus).
Currently only memory limit style properties are supported, but later I
also plan to expand this out to other properties that systemd should
have ultimate control over.
building systemd fails with a compiler that supports
-fstack-protector but does not enable it by default.
(will miss several __stack_chk_* symbols).
fix this by also adding the switch during linking.
Signed-off-by: Norbert Lange <nolange79@gmail.com>
Extend the existing rules to match the Thinkpad models for the
previous 3 generations. It will work if a Synaptic Trackpoint is
built into the notebook. It will not work for Elantech trackpoints.
Succcessfully tested with T470s and T490 model.
mkdir -p is called both when setting up the autofs mount, as well
as after being notified that the real mount unit should be called.
However the first mkdir -p is hardcoded with 0555, while the second
uses the value specified to DirectoryMode in the automount unit; the
second mkdir -p is only needed when called from coldplug, so under
normal operation the dirs are incorrectly created with mode 0555.
This replaces the hardcoded 0555 mode with the value of DirectoryMode.
Closes#13683.
Inside container, writing file returns EACCESS. Moreover, some devices
return ENODEV rather than EACCES. So, let's also ignore these two
error causes.
Closes#13652.
The public function and the implementation were split into two for
no particular reason.
We would assert() on the internal state of the client. This should not be done
in a function that is directly called from a public function. (I.e., we should
not crash if the public function is called at the wrong time.)
assert() is changed to assert_return().
And before anyone asks: I put the assert_returns() *above* the internal
variables on purpose. This makes it easier to see that the assert_returns()
are about the state that is passed in, and if they are not satisfied, the
function returns immediately. The compiler doesn't care either way, so
the ordering that is clearest to the reader should be chosen.
This partially reverts 95355a281c.
It seems that other parts of link_stop_clients() should be skipped
when restarting, but I don't know enough about those other clients to have
an opinion if it is better to stop&start them on restart or not.
Anyway, that can be done in later patches now that the support for restarts
is there.
Fixes#13625.
The code supports SIGTERM and SIGINT to termiante the process. It would
be possible to reporpose one of those signals for the restart operation,
but I think it's better to use a completely different signal to avoid
misunderstandings.
Setting the log level based on the signal made sense when signals that
were used were fixed. Since we allow signals to be configured, it doesn't
make sense to log at notice level about e.g. a restart or stop operation
just because the signal used is different.
This avoids messages like:
six.service: Killing process 210356 (sleep) with signal SIGINT.
v2:
- if RestartKillSignal= is not specified, fall back to KillSignal=. This is necessary
to preserve backwards compatibility (and keep KillSignal= generally useful).
We should never have used an unprefixed environment variable name.
All other systemd-nspawn variables have the "SYSTEMD_NSPAWN_" prefix,
and all other systemd variables have the "SYSTEMD_" prefix.
The new variable name takes precedence, but we fall back to checking the
old one. If only the old one is found, a warning is emitted.
In addition, SYSTEMD_NSPAWN_UNIFIED_HIERARCHY="" is accepted as an override
to avoid looking for the old variable name.
We have a variable with the same name ($UNIFIED_CGROUP_HIERARCHY) in tests,
which governs both systemd-nspawn and qemu behaviour. It is not renamed.
We would parse the environment twice (to re-apply settings after reading
config from disk), but we would not check the return code first time.
This means that for some settings we would ignore invalid values, while
for others, we'd fail at some point.
Let's just consistently fail. Those environment variables define important
aspects of behaviour, and it is better for the user if we ignore invalid
values. (Unknown settings are still ignored, so forward compatibility is
maintained.)
