Support per-instance start bypassing assembly#2617
Merged
SuperStrongDinosaur merged 1 commit intoJun 15, 2026
Conversation
SuperStrongDinosaur
force-pushed
the
backend_start
branch
from
d8ed72c to
58c54a5
Compare
SuperStrongDinosaur
changed the title
SuperStrongDinosaur
force-pushed
the
backend_start
branch
5 times, most recently
from
29a424c to
2d985ec
Compare
SuperStrongDinosaur
force-pushed
the
backend_start
branch
2 times, most recently
from
0997443 to
ef25374
Compare
SuperStrongDinosaur
force-pushed
the
backend_start
branch
2 times, most recently
from
066564f to
4cb3d8d
Compare
Databean
reviewed
Jun 9, 2026
SuperStrongDinosaur
force-pushed
the
backend_start
branch
5 times, most recently
from
b847821 to
1b91897
Compare
Databean
approved these changes
Jun 11, 2026
SuperStrongDinosaur
added
the
kokoro:force-run
GoogleCuttlefishTesterBot
removed
the
kokoro:force-run
SuperStrongDinosaur
force-pushed
the
backend_start
branch
from
1b91897 to
63bbf47
Compare
github-merge-queue
Bot
removed this pull request from the merge queue due to failed status checks
github-merge-queue
Bot
removed this pull request from the merge queue due to failed status checks
SuperStrongDinosaur
removed this pull request from the merge queue due to a manual request
SuperStrongDinosaur
force-pushed
the
backend_start
branch
from
63bbf47 to
070f386
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Summary
Running cvd start typically triggers assemble_cvd, which regenerates the cuttlefish_config.json for all configured instances. Running this in a shared environment for a single instance can overwrite and corrupt the configuration of already running instances. This change allows starting a specific stopped instance using its existing assembled configuration.
Key Changes
Assembly Bypass: Modified CvdStartCommandHandler::Handle to detect if a specific instance is targeted via selectors. Added a disk check for cuttlefish_config.json before bypassing assembly. If the configuration is missing, it correctly falls back to the normal group start path, runs assemble_cvd, and boots all instances.
LaunchSingleInstance Implementation: Added LaunchSingleInstance which directly constructs and invokes the run_cvd command for the target instance, bypassing assemble_cvd.
Environment Setup: Ensures LaunchSingleInstance sets up the exact environment variables required for run_cvd to boot the specific instance.
Database Status Update Fix: Updated LaunchSingleInstance to only update the database state for the targeted instance being started, preventing other stopped instances in the group from being incorrectly marked as active.
Bug
b/459780275
Document
go/cuttlefish-per-instance-control
Frontend pr
#2618