syz-ci: introduce gitArchive parameters

Some commits don't live long remotely.
It sometimes happens we need them later to:
1. Merge coverage.
2. Mention during communication.

2 files changed, 20 insertions, 1 deletions

diff --git a/syz-ci/manager.go b/syz-ci/manager.go
index 21941cfde..fd19a8780 100644
--- a/syz-ci/manager.go
+++ b/syz-ci/manager.go
@@ -256,6 +256,16 @@ loop:
 	log.Logf(0, "%v: stopped", mgr.name)
 }
 
+func (mgr *Manager) archiveCommit(commit string) {
+	if mgr.cfg.GitArchive == "" || mgr.mgrcfg.DisableGitArchive {
+		return
+	}
+	if err := mgr.repo.PushCommit(mgr.cfg.GitArchive, commit); err != nil {
+		mgr.Errorf("%v: failed to archive commit %s from repo %s: %s",
+			mgr.name, commit, mgr.mgrcfg.Repo, err.Error())
+	}
+}
+
 func (mgr *Manager) pollAndBuild(lastCommit string, latestInfo *BuildInfo) (
 	string, *BuildInfo, time.Duration) {
 	rebuildAfter := buildRetryPeriod
@@ -277,7 +287,9 @@ func (mgr *Manager) pollAndBuild(lastCommit string, latestInfo *BuildInfo) (
 				if err := mgr.build(commit); err != nil {
 					log.Logf(0, "%v: %v", mgr.name, err)
 				} else {
-					log.Logf(0, "%v: build successful, [re]starting manager", mgr.name)
+					log.Logf(0, "%v: build successful", mgr.name)
+					mgr.archiveCommit(lastCommit)
+					log.Logf(0, "%v: [re]starting manager", mgr.name)
 					mgr.buildFailed = false
 					rebuildAfter = kernelRebuildPeriod
 					latestInfo = mgr.checkLatest()
diff --git a/syz-ci/syz-ci.go b/syz-ci/syz-ci.go
index 28cbbbcf0..a4acc8876 100644
--- a/syz-ci/syz-ci.go
+++ b/syz-ci/syz-ci.go
@@ -144,6 +144,10 @@ type Config struct {
 	// Per-vm type JSON diffs that will be applied to every instace of the
 	// corresponding VM type.
 	PatchVMConfigs map[string]json.RawMessage `json:"patch_vm_configs"`
+	// Some commits don't live long.
+	// Push all commits used in kernel builds to this git repo URL.
+	// The archive is later used by coverage merger.
+	GitArchive string `json:"git_archive"`
 }
 
 type ManagerConfig struct {
@@ -210,6 +214,9 @@ type ManagerConfig struct {
 	BisectBackports []vcs.BackportCommit `json:"bisect_backports"`
 	// Base syz-manager config for the instance.
 	ManagerConfig json.RawMessage `json:"manager_config"`
+	// By default we want to archive git commits.
+	// This opt-out is needed for *BSD systems.
+	DisableGitArchive bool `json:"disable_git_archive"`
 	// If the kernel's commit is older than MaxKernelLagDays days,
 	// fuzzing won't be started on this instance.
 	// By default it's 30 days.