Study case: Aspeed OpenBMC (commit 742fec782ef6c34c9fcd866116631e1d7aeedf8c)
This package includes several services, with the two most important ones being Version and Updater.
xyz.openbmc_project.Software.Version.service- Implemented in
image_manager_main.cpp
- Implemented in
xyz.openbmc_project.Software.BMC.Updater.service- Implemented in
item_updater_main.cppalong with several shell scripts
- Implemented in
The image manager service sets up a watcher to monitor /tmp/images/, and upon detection of new images, performs basic checks and generates a DBus object called Version.
Each newly generated Version triggers the match handler in the item updater service, which generates the Activation DBus object, waiting to be activated.
When the RequestedActivation property, defined in the phosphor-dbus-interfaces package, is set, the item updater service proceeds with the following steps:
- Optionally verify the signature.
- Subscribe to system signals to be informed when a service unit finishes.
- Write to flash memory:
- For static updates, copy images to
/run/initramfs/. - For UBI and MMC updates, call
obmc-flash-bmcto perform the flashing.
- For static updates, copy images to
- Delete the
Versionobject in theimage manager. - If the apply time is immediate, reboot the BMC:
- Note: This process involves multiple steps before the actual hardware reset, including executing the
shutdownscript and assisting with flashing images in/run/initramfs/.
- Note: This process involves multiple steps before the actual hardware reset, including executing the
Each storage type has its own flashWrite() implementation, which calls the corresponding wrappers and ultimately utilizes the helper obmc-flash-bmc to perform the actual tasks.
More Details
obmc-flash-bmc
+----------------+
| obmc-flash-bmc |
+-|--------------+
|
|--> switch
|--> case mtduboot
| - +-----------+
| +--> | mtd_write | flash image (image-u-boot) to target mtd
| +-----------+
|--> (skip ubi related cases, see no ubi device in my study case)
| - +-----------------+
| +--> | backup_env_vars | copy kernelname/ubiblock/root from env_var to config_file
| +-----------------+
|--> case updateubootvars
| - +-----------------+
| +--> | update_env_vars |
| +-----------------+
|--> case rebootguardenable
| - +-------------------+
| +--> | rebootguardenable | enable reboot-guard
| +-------------------+
|--> case rebootguarddisable
| - +--------------------+
| +--> | rebootguarddisable |
| +--------------------+
|--> case mirroruboot
| - +-------------+
| +--> | mirroruboot | mirror uboot to alt
| +-------------+
|--> case mmc
| - +------------+
| +--> | mmc_update | flash bmc image to mmc
| +------------+
|--> case mmc-mount
| - +-----------+
| +--> | mmc_mount | mount mmc
| +-----------+
|--> case mmc-remove
| - +------------+
| +--> | mmc_remove | remove bmc image in mmc
| +------------+
|--> case mmc-setprimary
| - +----------------+
| +--> | mmc_setprimary | set bootside=bootside, and next time it boots from there
| +----------------+
|--> case static-altfs
| -
| +--> mount alternative
|
+--> case umount-static-altfs
-
+--> unmount alternative
obmc-flash-bmc
+-----------------+
| backup_env_vars | : copy kernelname/ubiblock/root from env_var to config_file
+-|---------------+
| +---------------------+
|--> | copy_env_var_to_alt | copy kernel name from env_var to config_file
| +---------------------+
| +----------------------+
|--> | copy_ubiblock_to_alt | copy ubiblock from env_var to config_file
| +----------------------+
| +------------------+
+--> | copy_root_to_alt | copy root from env_var to config_file
+------------------+
obmc-flash-bmc
+-------------+
| mirroruboot | : mirror uboot to alt
+-|-----------+
|
|--> determine device file of 'u-boot' and 'alt-u-boot'
|
|--> calculate checksum for each of them
|
+--> if the checksums differ
|
|--> determine device file of 'u-boot-env' and 'alt-u-boot-env'
|
| +----------+
|--> | mtd_copy | mirror bmc to alt
| +----------+
| +----------+
|--> | mtd_copy | mirror bmc env to alt
| +----------+
| +----------------------+
|--> | copy_ubiblock_to_alt | copy ubiblock from env_var to config_file
| +----------------------+
| +------------------+
+--> | copy_root_to_alt | copy root from env_var to config_file
+------------------+
obmc-flash-bmc
+------------+
| mmc_update | : flash bmc image to mmc
+-|----------+
|
|--> compare uboot@dev and uboot@img
|
|--> if they are different
| -
| +--> mirror data from img to dev
|
| +-------------------------+
|--> | mmc_get_secondary_label | get the secondary label (non-running one)
| +-------------------------+
|
|--> extract image-kernel and write to secondary dev
|
|--> extract image-rofs and write to secondary dev
|
|--> (can't find 'sgdisk' utility on system)
|
| +-----------+
|--> | partprobe | inform system of partition table change
| +-----------+
|
|--> if host fw exist (bios?)
| -
| +--> copy to somewhere and mount as read-only
|
| +-------------+
+--> | set_flashid | update property xyz.openbmc_project.Common.FilePath
+-------------+
obmc-flash-bmc
+-----------+
| mmc_mount | : mount mmc
+-|---------+
|
|--> get primary id and secondary id
|
|--> create primary and secondary folders
|
+--> mount image@mmc to the folders separately?
obmc-flash-bmc
+------------+
| mmc_remove | : remove bmc image in mmc
+-|----------+
| +-----------------------+
|--> | mmc_get_primary_label |
| +-----------------------+
|
|--> return if flash_id == primary_id (don't remove the running one)
|
|--> use dd to destroy 'boot' and 'rofs'
|
|--> ensure host_fw_alt isn't mounted
|
+--> if host_fw is mounted, remove something in it
download_manager_main.cpp
+------+
| main | ???
+-|----+
|
|--> request name 'xyz.openbmc_project.Software.Download'
|
+--> endless loop
-
+--> process (?)
download_manager.cpp
+---------------------------+
| Download::downloadViaTFTP | : download image from tftp server
+-|-------------------------+
|
|--> check if folder for upload exists: img-upload-dir
|
| +------+
|--> | fork |
| +------+
|
+--> if self is forked child
|
| +------+
|--> | fork | (why fork again)
| +------+
|
+--> if self is forked child
-
+--> tftp -g -r <file_name> <server_addr>
item_updater_main.cpp
+------+
| main |
+-|----+
|
|--> SOFTWARE_OBJPATH=/xyz/openbmc_project/software
|
|--> prepare updater
| +--------------------------+
| | ItemUpdater::ItemUpdater | prepare an item updater
| +--------------------------+
|
+--> request name 'xyz.openbmc_project.Software.BMC.Updater'
item_updater.hpp
+--------------------------+
| ItemUpdater::ItemUpdater | : prepare an item updater
+-|------------------------+
|
|--> prepare match rule and callback on "/xyz/openbmc_project/software"
| +-------------------------------+
| | ItemUpdater::createActivation | parse info from msg, prepare objects, add to 'versions' and 'activationis' separately
| +-------------------------------+
|
| +-----------------------------+
|--> | ItemUpdater::getRunningSlot | get running slot from "/run/media/slot"
| +-----------------------------+
| +----------------------------------+
|--> | ItemUpdater::setBMCInventoryPath | get bmc_inventory_path from obj_mapper, save in member variable
| +----------------------------------+
| +------------------------------+
|--> | ItemUpdater::processBMCImage | create a few associations and a activation instance
| +------------------------------+
| +-------------------------------------+
+--> | ItemUpdater::restoreFieldModeStatus | read uboot env, enable field mode if necessary
+-------------------------------------+
item_updater.cpp
+-------------------------------+
| ItemUpdater::createActivation |: parse info from msg, prepare objects, add to 'versions' and 'activationis' separately
+-|-----------------------------+
|
|--> read msg into 'interfaces'
|
|--> given interfaces, save info of property 'Purpose', 'Version', 'Path', 'ExtendedVersion', 'Names'
|
|--> get version_id from last entry of file path
|
+--> if version_id isn't in 'activations' yet
|
|--> if purpose is 'bmc' or 'system'
| |
| | +------------------------------------+
| +--> result = | ItemUpdater::validateSquashFSImage | check if files in image_update_list are good
| +------------------------------------+
|
|--> else (host?), result = ready
|
| if result is ready
| -
| +--> make tuple (inventory, activation, bmcInventoryPath(?))
|
|--> prepare version_class
|
|--> add to 'versions'
|
+--> add tuple (association) to 'activations'
item_updater.cpp
+------------------------------------+
| ItemUpdater::validateSquashFSImage | : check if files in image_update_list are good
+-|----------------------------------+
|
|--> add "image-bmc" to image_update_list
|
| +-------------------------+
|--> | ItemUpdater::checkImage | check if file in image_update_list is good
| +-------------------------+
|
+--> if not good
|
|--> add "image-kernel", "image-rofs", "image-rwfs", "image-u-boot" to image_update_list
|
| +-------------------------+
+--> | ItemUpdater::checkImage | check if files in image_update_list are good
+-------------------------+
item_updater.cpp
+----------------------------------+
| ItemUpdater::setBMCInventoryPath | : get bmc_inventory_path from obj_mapper, save in member variable
+-|--------------------------------+
|
|--> .new_method_call xyz.openbmc_project.ObjectMapper
| /xyz/openbmc_project/object_mapper
| xyz.openbmc_project.ObjectMapper
| GetSubTreePaths
| target_obj = /xyz/openbmc_project/inventory/
| depth = 0
| filter = {xyz.openbmc_project.Inventory.Item.Bmc}
|
|--> prepare arguments, e.g., filter = xyz.openbmc_project.Inventory.Item.Bmc
|
|--> call and read response
|
+--> get bmc_inventory_path
item_updater.cpp
+------------------------------+
| ItemUpdater::processBMCImage | : create a few associations and a activation instance
+-|----------------------------+
|
|--> ensure folder '/run/media' exists
|
|--> for each entry in '/run/media'
| -
| +--> if the file starts with 'rofs-'
| |
| | +-----------------------------+
| |--> | VersionClass::getBMCVersion | get bmc version from file '/etc/os-release'
| | +-----------------------------+ (key, value) = e.g., VERSION_ID=2.13.0-dev-7765-g3890739b4e
| |
| |--> id = digest(version + flash_id), e.g., ac6272b0
| |
| |--> continue if id is already in 'versions'
| |
| | +-------------------------------------+
| |--> | VersionClass::getBMCExtendedVersion | get bmc ext version from file
| | +-------------------------------------+ e.g., EXTENDED_VERSION="2.13.0-dev-7765-g3890739b4e"
| |
| |--> if 'functionial'
| | |
| | | +------------------------------------------+
| | +--> | ItemUpdater::createFunctionalAssociation | create association ('functional' & 'software_version')
| | +------------------------------------------+ tuple = (functional, software_version, /xyz/openbmc_project/software/ + $id)
| |
| |--> if state is active
| | |
| | |--> create association ('inventory' & 'activation')
| | | tuple = (inventory, activation, $bmc_inventory_path = ???)
| | |
| | | +-------------------------+
| | +--> | createActiveAssociation | create association ('active', 'software')
| | +-------------------------+ tuple = (active, software_version, /xyz/openbmc_project/software/ + $id)
| | +------------------------------------------+
| |--> | ItemUpdater::createUpdateableAssociation | create association ('updateable', 'software_version')
| | +------------------------------------------+ tuple = (updateable, software_version, /xyz/openbmc_project/software/ + $id)
| |
| |--> create activation instance for this version
| |
| +--> if state is active
| -
| +--> create redundancy_priority instance for this version
|
+--> if no functioinal found
|
|--> create rofs-<versionId>-functional
|
| +------------------------------+
+--> | ItemUpdater::processBMCImage | (call again to create dbus instance)
+------------------------------+
item_updater.cpp
+-------------------------------------+
| ItemUpdater::restoreFieldModeStatus | : read uboot env, enable field mode if necessary
+-|-----------------------------------+
|
|--> read data from /dev/mtd/u-boot-env
|
+--> if 'fieldmode=true' exists
|
| +-------------------------------+
+--> | ItemUpdater::fieldModeEnabled | enable field mode (?)
+-------------------------------+
item_updater.cpp
+-------------------------------+
| ItemUpdater::fieldModeEnabled | : enable field mode (?)
+-|-----------------------------+
|
|--> if arg == ture && it's not yet enabled
|
|--> call service: org.freedesktop.systemd1
| object: /org/freedesktop/systemd1
| iface: org.freedesktop.systemd1.Manager
| StartUnit
|
|--> call service: org.freedesktop.systemd1
| object: /org/freedesktop/systemd1
| iface: org.freedesktop.systemd1.Manager
| StopUnit
|
+--> call service: org.freedesktop.systemd1
object: /org/freedesktop/systemd1
iface: org.freedesktop.systemd1.Manager
MaskUnitFiles
activation.cpp
+------------------------+
| Activation::activation |
+-|----------------------+
|
+--> if value == activating
|
| +-----------------------------+
|--> | Activation::verifySignature | prepare key & hash, verify {manifest, pubkey, image files, full-image)
| +-----------------------------+
| +----------------------------+
|--> | minimum_ship_level::verify |
| +----------------------------+
|
|--> ensure activation_progress exists
|
|--> if the purpose is 'host'
| |
| | +---------------------------------------+
| |--> | Activation::subscribeToSystemdSignals | subscribe systemd signals (?)
| | +---------------------------------------+
| |
| |--> set initial progress = 20%
| |
| | +----------------------------+
| |--> | Activation::flashWriteHost | call systemd service to flash host bios
| | +----------------------------+
| |
| +--> return
|
|--> set initial progress = 10%
|
| +---------------------------------------+
|--> | Activation::subscribeToSystemdSignals | subscribe systemd signals (?)
| +---------------------------------------+
| +------------------------+
|--> | Activation::flashWrite | copy image to /run/initramfs, and expect it's flashed during reboot
| +------------------------+
| +---------------------------------+
+--> | Activation::onFlashWriteSuccess | emove object from software manager, reboot if 'apply_time' is immediate
+---------------------------------+
activation.cpp
+-----------------------------+
| Activation::verifySignature | : prepare key & hash, verify {manifest, pubkey, image files, full-image)
+-|---------------------------+
|
|--> prepare object 'signature'
| +----------------------+
| | Signature::Signature | get key_type, hash_type and purpose from manifest file
| +----------------------+
|
| +-------------------+
+--> | Signature::verify | verify manifest, pubkey, image files, full-image
+-------------------+
image_verify.cpp
+-------------------+
| Signature::verify | : verify manifest, pubkey, image files, full-image
+-|-----------------+
| +------------------------------+
|--> | Signature::systemLevelVerify | verify manifest and pubkey files
| +------------------------------+
| +--------------------------------+
|--> | Signature::checkAndVerifyImage | verify each file in given list ("image-bmc")
| +--------------------------------+
|
|--> if failed
| |
| | +--------------------------------+
| +--> | Signature::checkAndVerifyImage | verify each file in given list ("image-kernel", "image-rofs", "image-rwfs", "image-u-boot")
| +--------------------------------+
|
|--> (skip the verification of optioinal images)
|
| +----------------------------+
+--> | Signature::verifyFullImage | merge files into one full image, verify it, remove the merged file
+----------------------------+
image_verify.cpp
+------------------------------+
| Signature::systemLevelVerify | : verify manifest and pubkey files
+-|----------------------------+
| +-------------------------------------------+
|--> | Signature::getAvailableKeyTypesFromSystem | search hash_file and key_file, collect their parent path and return
| +-------------------------------------------+
|
|--> build pugkey and its signature file name
|
|--> build manifest and its signature file name
|
+--> for each key_type
|
| +--------------------------------+
|--> | Signature::getKeyHashFileNames | make pair (hash_path, key_path)
| +--------------------------------+
| +-----------------------+
|--> | Signature::verifyFile | verify file (manifest signature)
| +-----------------------+
|
+--> if valid
|
| +-----------------------+
+--> | Signature::verifyFile | verify file (pubkey signature)
+-----------------------+
image_verify.cpp
+-------------------------------------------+
| Signature::getAvailableKeyTypesFromSystem | : search hash_file and key_file, collect their parent path and return
+-|-----------------------------------------+
|
|--> check if signed_conf exists (should)
|
+--> for each file under signed_conf (is it /etc/activationdata/OpenBMC?)
-
+--> if it's a hash_file or public_key_file
-
+--> add parent_path to key_types
image_verify.cpp
+-----------------------+
| Signature::verifyFile | : verify file
+-|---------------------+
| +----------------------------+
|--> | Signature::createPublicRSA | create rsa
| +----------------------------+
| +--------------+
|--> | rsaVerifyCtx | init digest context
| +--------------+
| +-------------------------+
|--> | OpenSSL_add_all_digests | add all algo to internal table
| +-------------------------+
| +----------------------+
|--> | EVP_get_digestbyname | create hash struct
| +----------------------+
| +----------------------+
|--> | EVP_DigestVerifyInit |
| +----------------------+
| +------------------------+
|--> | EVP_DigestVerifyUpdate |
| +------------------------+
| +-----------------------+
+--> | EVP_DigestVerifyFinal |
+-----------------------+
image_verify.cpp
+--------------------------------+
| Signature::checkAndVerifyImage | : verify each file in given list
+-|------------------------------+
|
+--> for each bmc_image
|
| +-----------------------+
+--> | Signature::verifyFile | verify file
+-----------------------+
image_verify.cpp
+----------------------------+
| Signature::verifyFullImage | : merge files into one full image, verify it, remove the merged file
+-|--------------------------+
|
|--> return if it's not a bmc fw
|
|--> prepare list of full_images
|
| +-------------------+
|--> | utils::mergeFiles | merge files into one
| +-------------------+
| +-----------------------+
|--> | Signature::verifyFile | verify file
| +-----------------------+
|
+--> remove the merged file
activation.cpp
+----------------------------+
| Activation::flashWriteHost | : call systemd service to flash host bios
+-|--------------------------+
|
|--> prepare method call org.freedesktop.systemd1
| /org/freedesktop/systemd1
| org.freedesktop.systemd1.Manager
| StartUnit
|
|--> service file = "obmc-flash-host-bios@" + versionId + ".service"
| reference: obmc-flash-host-bios@.service.in
|
+--> call()
static/flash.cpp
+------------------------+
| Activation::flashWrite | : copy image to /run/initramfs, and expect it's flashed during reboot
+-|----------------------+
|
|--> if running_image_slot != 0
| |
| |--> prepare method call org.freedesktop.systemd1
| | /org/freedesktop/systemd1
| | org.freedesktop.systemd1.Manager
| | StartUnit
| |
| |--> service_file = FLASH_ALT_SERVICE_TMPL + versionId + ".service"
| | reference: obmc-flash-bmc-alt@.service.in? not found
| |
| |--> call()
| |
| +--> return
|
+--> for each bmc_image in update_list
-
+--> copy to "/run/initramfs"
(we expect the updater script handles it during reboot)
activation.cpp
+---------------------------------+
| Activation::onFlashWriteSuccess | : remove object from software manager, reboot if 'apply_time' is immediate
+-|-------------------------------+
|
|--> set progress to 100%
|
| +-------------------------------------------+
|--> | Activation::unsubscribeFromSystemdSignals | unsubscribe systemd signals
| +-------------------------------------------+
| +-----------------------+
|--> | updater::storePurpose | save 'purpose' to /var/lib/phosphor-bmc-code-mgmt/
| +-----------------------+
| +--------------------------------------+
|--> | Activation::deleteImageManagerObject | delete 'version' object from software manager
| +--------------------------------------+
| +--------------------------------------+
|--> | ItemUpdater::createActiveAssociation | associate (active, software_version)
| +--------------------------------------+
| +------------------------------------------+
|--> | ItemUpdater::createUpdateableAssociation | associate (updateable, software_version)
| +------------------------------------------+
| +-------------------------------------+
|--> | Activation::checkApplyTimeImmediate | read property 'requested_apply_time' to determine if it is 'immediate'
| +-------------------------------------+
|
+--> if it is 'immediate'
|
| +-----------------------+
+--> | Activation::rebootBmc | call systemd service to reboot bmc
+-----------------------+
activation.cpp
+--------------------------------------+
| Activation::deleteImageManagerObject | : delete 'version' object from software manager
+-|------------------------------------+
|
|--> query mapper for object of intf xyz.openbmc_project.Software.Version
|
+--> delete 'version' object
activation.cpp
+-------------------------------------+
| Activation::checkApplyTimeImmediate | : read property 'requested_apply_time' to determine if it is 'immediate'
+-|-----------------------------------+
|
|--> get service of object: /xyz/openbmc_project/software/apply_time
| iface: xyz.openbmc_project.Software.ApplyTime
|
|--> get property 'RequestedApplyTime'
|
+--> check if it is 'immediate'
image_manager_main.cpp
+------+
| main |
+-|----+
|
|--> request name "xyz.openbmc_project.Software.Version"
|
|--> prepare watch
| +--------------+
| | Watch::Watch | monitor 'image upload' folder, register callback to event 'close_write'
| +--------------+ +-----------------------+
| | Manager::processImage | untar, check manifest, prepare 'version' obj and insert to 'verions'
| +-----------------------+
| +---------------+
+--> | sd_event_loop |
+---------------+
image_manager.cpp
+-----------------------+
| Manager::processImage | : untar, check manifest, prepare 'version' obj and insert to 'verions'
+-|---------------------+
|
|--> prepare tmp_path
|
|--> untar the tarball to tmp_path
|
|--> check 'version' in MANIFEST (can't be empty)
|
|--> get current machine from /etc/os-release
|
|--> get machine from MANIFEST
|
|--> these two 'machine' should match
|
|--> check 'purpose' in MANIFEST (can't be empty)
|
| +--------------------+
|--> | getSoftwareObjects | call obj_mapper to get software objects
| +--------------------+
|
|--> rename tmp_dir to image_dir
|
+--> prepare 'Version' obj and insert to 'versions'
watch.cpp
+--------------+
| Watch::Watch | : monitor 'image upload' folder, register callback to event 'close_write'
+-|------------+
|
|--> .imageCallback = arg imageCallback
|
|--> ensure 'IMG_UPLOAD_DIR' folder exists
|
| +---------------+
|--> | inotify_init1 | prepare 'inotify' instance
| +---------------+
| +-------------------+
|--> | inotify_add_watch | monitor 'close_write' event happened in IMG_UPLOAD_DIR
| +-------------------+
| +-----------------+
+--> | sd_event_add_io | register callback 'Watch::callback' for the event
+-----------------+
watch.cpp
+-----------------+
| Watch::callback | : handle event (e.g., untar uploaded tarball, check manifest, prepare 'version' and add to 'versions')
+-|---------------+
|
|--> read data from fd of inotify instance
|
+--> while we haven't handled all the data
|
|--> convert data to event
|
|--> assemble tar ball path
|
|--> call ->imageCallback(tar_ball_path), e.g.,
| +-----------------------+
| | Manager::processImage | untar, check manifest, prepare 'version' obj and insert to 'verions'
| +-----------------------+
|
+--> advance offset
"xyz.openbmc_project.HealthMon"
"/xyz/openbmc_project/sensors/utilization/CPU" empty
xyz.openbmc_project.ObjectMapper
/xyz/openbmc_project/software/c3a09353/software_version
xyz.openbmc_project.Association
"xyz.openbmc_project.HealthMon" endpoints = "/xyz/openbmc_project/software"
"/xyz/openbmc_project/sensors/utilization/Memory" empty
xyz.openbmc_project.ObjectMapper
"org.open_power.Software.Host.Updater" /xyz/openbmc_project/software/active
"/xyz/openbmc_project/software" empty xyz.openbmc_project.Association
endpoints = "/xyz/openbmc_project/software/c3a09353"
"xyz.openbmc_project.Software.BMC.Updater"
"/xyz/openbmc_project/software"
xyz.openbmc_project.Association.Definitions xyz.openbmc_project.ObjectMapper
"functional" "software_version" "/xyz/openbmc_project/software/c3a09353" /xyz/openbmc_project/software/functional
xyz.openbmc_project.Association
"active" "software_version" "/xyz/openbmc_project/software/c3a09353" endpoints = "/xyz/openbmc_project/software/c3a09353"
"updateable" "software_version" "/xyz/openbmc_project/software/c3a09353"
"xyz.openbmc_project.Software.BMC.Updater" xyz.openbmc_project.ObjectMapper
"/xyz/openbmc_project/software/c3a09353" /xyz/openbmc_project/software/updateable
xyz.openbmc_project.Association
endpoints = "/xyz/openbmc_project/software/c3a09353"
"inventory" "activation" ""
https://github.com/openbmc/phosphor-bmc-code-mgmt
busctl call --verbose \
xyz.openbmc_project.ObjectMapper \
/xyz/openbmc_project/object_mapper \
xyz.openbmc_project.ObjectMapper \
GetObject \
sas \
/xyz/openbmc_project/software \
1 \
xyz.openbmc_project.Common.FactoryReset
busctl call --verbose \
xyz.openbmc_project.ObjectMapper \
/xyz/openbmc_project/object_mapper \
xyz.openbmc_project.ObjectMapper \
GetSubTreePaths \
sias \
/xyz/openbmc_project/software \
0 \
1 \
xyz.openbmc_project.Software.Version
busctl call --verbose \
xyz.openbmc_project.ObjectMapper \
/xyz/openbmc_project/object_mapper \
xyz.openbmc_project.ObjectMapper \
GetSubTreePaths \
sias \
/xyz/openbmc_project/inventory/ \
0 \
1 \
xyz.openbmc_project.Inventory.Item.Bmc