Implement a 'Use Last Successful Prebuild' workspace creation mode

Author: jankeromnes

components/dashboard/src/start/CreateWorkspace.tsx

@@ -269,6 +269,9 @@ export default class CreateWorkspace extends React.Component<CreateWorkspaceProp
             return (
                 <RunningPrebuildView
                     runningPrebuild={result.runningWorkspacePrebuild}
+                    onUseLastSuccessfulPrebuild={() =>
+                        this.createWorkspace(CreateWorkspaceMode.UseLastSuccessfulPrebuild)
+                    }
                     onIgnorePrebuild={() => this.createWorkspace(CreateWorkspaceMode.ForceNew)}
                     onPrebuildSucceeded={() => this.createWorkspace(CreateWorkspaceMode.UsePrebuild)}
                 />
@@ -531,6 +534,7 @@ interface RunningPrebuildViewProps {
         starting: RunningWorkspacePrebuildStarting;
         sameCluster: boolean;
     };
+    onUseLastSuccessfulPrebuild: () => void;
     onIgnorePrebuild: () => void;
     onPrebuildSucceeded: () => void;
 }
@@ -565,6 +569,12 @@ function RunningPrebuildView(props: RunningPrebuildViewProps) {
             {/* TODO(gpl) Copied around in Start-/CreateWorkspace. This should properly go somewhere central. */}
             <div className="h-full mt-6 w-11/12 lg:w-3/5">
                 <PrebuildLogs workspaceId={workspaceId} onIgnorePrebuild={props.onIgnorePrebuild}>
+                    <button
+                        className="secondary"
+                        onClick={() => props.onUseLastSuccessfulPrebuild && props.onUseLastSuccessfulPrebuild()}
+                    >
+                        Use Last Successful Prebuild
+                    </button>
                     <button className="secondary" onClick={() => props.onIgnorePrebuild && props.onIgnorePrebuild()}>
                         Skip Prebuild
                     </button>

components/gitpod-protocol/src/protocol.ts

@@ -1372,6 +1372,8 @@ export enum CreateWorkspaceMode {
     UsePrebuild = "use-prebuild",
     // SelectIfRunning returns a list of currently running workspaces for the context URL if there are any, otherwise falls back to Default mode
     SelectIfRunning = "select-if-running",
+    // UseLastSuccessfulPrebuild returns ...
+    UseLastSuccessfulPrebuild = "use-last-successful-prebuild",
 }
 
 export namespace WorkspaceCreationResult {

components/server/ee/src/workspace/gitpod-server-impl.ts

@@ -963,6 +963,32 @@ export class GitpodServerEEImpl extends GitpodServerImpl {
 
             const logCtx: LogContext = { userId: user.id };
             const cloneUrl = context.repository.cloneUrl;
+            if (mode === CreateWorkspaceMode.UseLastSuccessfulPrebuild) {
+                const maxDepth = this.config.incrementalPrebuilds.commitHistory;
+                const hostContext = this.hostContextProvider.get(context.repository.host);
+                const repoProvider = hostContext?.services?.repositoryProvider;
+                if (repoProvider) {
+                    const commitHistory = await repoProvider.getCommitHistory(
+                        user,
+                        context.repository.owner,
+                        context.repository.name,
+                        context.revision,
+                        maxDepth,
+                    );
+                    log.info("findPrebuiltWorkspace: incremental workspace", { commitHistory });
+                    for (const commit of commitHistory) {
+                        const possiblePrebuild = await this.workspaceDb
+                            .trace(ctx)
+                            .findPrebuiltWorkspaceByCommit(cloneUrl, commit);
+                        if (possiblePrebuild) {
+                            log.info("findPrebuiltWorkspace: incremental workspace", { possiblePrebuild });
+                        }
+                    }
+                    // {"component":"server","severity":"INFO","time":"2022-10-12T12:57:06.447Z","message":"findPrebuiltWorkspace: incremental workspace","payload":{"commitHistory":["95b666410f37b5237bf416feb748fb1e8aab8fd4","ab01b49c669ce41e0fef1cb306b1ba648ff4ea6a","b3d8f3ada8e729a99b334f75b45eacf240350afa","71d1a3cae0121b2fea14a69b97bcdddce44809ac","218dd0667a7eff7ed657f27b570431919cd87be7","feb2d8b057f751ccd13a7aec07ecfd85757cbb09","9270c10e3b1c23f0a65253cd516aae55120550e9","a70117ff7ae75de4de6c922ab9953e299c711046","24c9dcb64f582ae696797dc617b9af1352a6f01a","6f2aff3ebf94cf40a0c96e87bfd00b2917fc7adb","98b4bfb6190a3bb9fb0f513ffc2bce4009177960","35c9687543411e9e1ced865a9fcd69e1003fe3ed","61d913686e3f5ac17bcd490774097dc6302c92bf","f93921910f80c085fafc5157f6d6b7205b19a4fa"]}}
+                    // TODO(janx): if (context.additionalRepositoryCheckoutInfo?.length > 0) { additionalRepositoryCommitHistories ? }
+                    // TODO(janx): walk back commit history to find a successful prebuild
+                }
+            }
             const prebuiltWorkspace = await this.workspaceDb
                 .trace(ctx)
                 .findPrebuiltWorkspaceByCommit(cloneUrl, commitSHAs);