kuber/README.md

# kuber

`kuber` is a Docker Compose to Kubernetes translation layer backed by a
self-hosted management service (`kuber-server`). It reads a local Compose file,
renders Kubernetes resources, and applies them to the cluster through an
authenticated v2 API. Image builds happen inside the cluster with rootless
BuildKit, so the workstation needs neither Docker nor `kubectl`.

## Architecture

```
workstation (kuber CLI)  ──HTTPS──▶  kuber-server (in-cluster pod)
                                        │
                                        ├─ CAS (content-addressed blobs on RWX PVC)
                                        ├─ BuildKit Jobs (rootless) ──▶ registry
                                        └─ Kubernetes API (RBAC-scoped)
```

The CLI authenticates to the server with a Bearer token acquired by `kuber
login`. It snapshots the repository into a content-addressed workspace, uploads
only the blobs the server is missing, and submits a build request. The server
materializes that workspace onto a shared RWX PVC and runs a rootless BuildKit
Job that builds and pushes the image, then the CLI pins the resulting immutable
registry digest into the rendered Deployment.

The server also owns reconciliation: it plans, applies, and prunes resources in
a per-project namespace, reconciles managed Postgres and S3 claims, rolls
deployments back, streams logs, and exposes interactive `exec` sessions over a
WebSocket.

## Directory Trust

Before `kuber up`, run `kuber trust` from the configured project directory.
Trust is exactly the configured namespace plus a SHA-256 fingerprint of the
resolved current working directory. The local mode-0600 store lets `up` fail
before builds from an untrusted directory. The server stores only namespace and
fingerprint registrations in labelled ConfigMaps in its `kuber-system` control
plane namespace, then checks the pair when resource reconciliation begins.

This is an accidental-targeting safeguard, not a security boundary: a client
that intentionally forges a registered fingerprint can pass it. `kuber trust
status` shows local/server awareness without printing paths; `kuber trust revoke`
removes the current directory registration.

## Environment Assumptions

kuber targets a specific self-hosted cluster and workstation setup. It is not
intended to run unchanged against an arbitrary Kubernetes environment. The
expected setup:

- an account on the `kuber-server` management API
- a working ClusterRole/Role (see [Server Deployment](#server-deployment))
- a registry the in-cluster BuildKit can push to

Not required locally:

- Docker
- `kubectl`

## API Origin

The v2 management API has one hard-coded origin:

```text
https://kuber.astrxl.dev/api/v2
```

## Authentication

```bash
kuber login dmgnr
kuber login dmgnr --persist
kuber whoami
kuber logout
```

The default login is stored with mode `0600` under
`$XDG_RUNTIME_DIR/kuber/session.json` and disappears with the user runtime
directory. `--persist` instead uses `$XDG_CONFIG_HOME/kuber/session.json`, or
`~/.config/kuber/session.json` when `XDG_CONFIG_HOME` is unset. Password input
is never echoed. Runtime sessions last 24 hours and persistent sessions last 30
days; `logout` revokes the server-side session. `readSession` falls back to the
persistent file when no runtime session exists.

The default login is scoped to the current user and the authenticated identity
is available to every v2 command. `login`, `logout`, `whoami`, and global
`maintenance` are the only commands that run without a loaded project configuration.

### Roles and Authorization

The server grants capabilities through three roles:

- `viewer` — read-only cluster access (`kubernetes:read`)
- `operator` — `viewer` plus `kubernetes:write` and `kubernetes:exec`
- `admin` — all capabilities, including user administration
  (`users:read`, `users:write`, `sessions:revoke`, `platform:adopt`)

Administer users with the `users` command tree:

```bash
kuber users ls
kuber users add dmgnr --roles admin
kuber users update dmgnr --roles operator
kuber users update dmgnr --password
kuber users disable dmgnr
kuber users enable dmgnr
kuber users delete dmgnr
kuber users revoke dmgnr
```

`users add`, `update --password`, and `delete` prompt for password / written
confirmation on an interactive terminal. Passwords are hashed with Argon2id on
the server and never stored in plaintext. Updating a user's roles or password
revokes all of that user's active sessions.

Inspect server-side operations and the audit trail:

```bash
kuber operations ls
kuber operations get <operation-id>
kuber audit ls
```

## Server Deployment

The repository's `compose.yml` owns the `kuber-system` namespace, the
`kuber-server` image, its Deployment, Service, and Ingress. `.kuberrc.ts`
extends the rendered manifests with the server's ServiceAccount and RBAC:

- a namespaced `Role`/`RoleBinding` (`kuber-server-auth`) for the `kuber-system`
  Secrets, ConfigMaps, Pods, Jobs, and Leases the server itself reads and writes
- a `ClusterRole`/`ClusterRoleBinding` (`kuber-server-manager`) granting the
  cross-namespace verbs it needs to manage user projects

`compose.yml` runs the server as a non-root user (`runAsUser`/`runAsGroup`
`1000`), drops all Linux capabilities, uses a read-only root filesystem with a
`RuntimeDefault` seccomp profile, and backs `/data` with a Longhorn PVC
(`kuber-build-data`). The PVC hosts the CAS, materialized workspaces, and
resumable upload bytes, and is shared with BuildKit Jobs.

Deploy the server with kuber itself:

```bash
KUBER_BOOTSTRAP_PASSWORD='replace-me' kuber up
```

The server creates an `admin` user (from `KUBER_BOOTSTRAP_USERNAME`, default
`dmgnr`) on first boot only if that user does not already exist. The bootstrap
Secret is only rendered while `KUBER_BOOTSTRAP_PASSWORD` is set. After logging
in successfully, reconcile without that variable and restart once so kuber
removes the stale bootstrap Secret and the password leaves the pod environment:

```bash
kuber up --no-b
kuber restart kuber-server
```

See [Account Recovery](#account-recovery) for what to do if you are locked out.

### Security Constraints

Because the server's ServiceAccount is scoped by the RBAC in `.kuberrc.ts`, it
can only act on the resources kuber manages. The management layer additionally
enforces ownership, so the server refuses to mutate resources that do not carry
kuber's workspace labels. Deleting a resource requires its UID as an optimistic
concurrency precondition, and workspace deletion also requires the namespace
UID. Namespaces that are not owned by kuber, or owned by a different workspace,
are never mutated (see [Workspaces and Migration](#workspaces-and-migration)).

## Workspaces and Migration

Each project maps to a Kubernetes namespace derived from the current working
directory. The CLI records a "workspace" on the server keyed by project name and
borrows the namespace UID to guarantee it owns the namespace before reconciling.
Adopting existing resources relabels them (Server-Side Apply) only when they are
already managed by kuber and not owned by another workspace.

`up` refuses to mutate a namespace when:

- the namespace already exists but does not carry kuber's managed-by label
  (`external`), or
- the namespace is labeled for a different workspace UID
  (`different-workspace`)

In those cases the CLI prints a hint to `POST
/workspaces/<project>/adopt` with the namespace UID to complete a safe,
explicit adoption. The platform namespace (`kuber-system`) is adopted through
the admin-only platform adoption route.

Workspace state, revisions, operations, and audit events are stored as Secrets
and ConfigMaps in `kuber-system` keyed by kuber's `kuber.astrxl.dev/type`
label. Workspace updates are optimistic (If-Match on resource version) and
immutable revisions are recorded so history survives. Expired sessions are
cleaned up on an interval, and stale operations are marked failed on server
startup recovery.

### Migration Behavior

`kuber up` is idempotent and safe to re-run. Each run:

1. snapshots the workspace and uploads missing blobs to the server CAS,
2. ensures the workspace record (creating or updating it with an optimistic
   If-Match),
3. adopts the namespace and its kuber-managed resources,
4. reconciles managed Postgres and S3 claims,
5. renders manifests, plans the diff, applies desired resources, waits for
   rollout, and deletes stale resources.

Because resource references are immutable digests, re-running `up` only restarts
deployments whose image content actually changed. `start` re-resolves published
digests without building.

## Registry Authentication

Building and pushing images from inside the cluster typically requires
credentials for the target registry. These are read from a Docker config file
(`KUBER_REGISTRY_CONFIG`, default `/etc/kuber/registry/config.json`) and mounted
as an image pull secret named by `KUBER_REGISTRY_SECRET`.

Registry authentication is optional. If `KUBER_REGISTRY_SECRET` is unset, the
server warns at startup and BuildKit uses anonymous registry access. This is
intended for registries that allow anonymous push/pull. The same credentials are
used when the server resolves a published image digest (`start` / `export`).

The server supports both standard registry bearer-token (`WWW-Authenticate:
Bearer`) and pre-emptive Basic auth when resolving digests.

### Build Registry Environment

The server's registry behavior is driven by a few closely related environment
variables:

- `KUBER_BUILD_REGISTRY` (default `registry.neko-piranha.ts.net`): the registry
  the in-cluster BuildKit pushes built images to and `kuber` uses as the image
  namespace. It also supplies the registry host for authentication.
- `KUBER_INTERNAL_REGISTRY_HOST`: the host of an internal registry (for example
  the in-cluster distribution service) used for the BuildKit cache image and,
  when set, the image direct push target. When unset, push and cache fall back
  to `KUBER_BUILD_REGISTRY`.
- `KUBER_INTERNAL_REGISTRY_INSECURE`: set to `"true"` to push to the internal
  registry over plain HTTP instead of HTTPS. Only meaningful when
  `KUBER_INTERNAL_REGISTRY_HOST` is set.
- `KUBER_PUSH_IMAGE_PREFIX` (default `kuber/`): a prefix applied to project
  images pushed to the internal registry when `KUBER_INTERNAL_REGISTRY_HOST` is
  configured.
- `KUBER_REGISTRY_RESOLVE_ORIGIN`: an explicit origin used to resolve a
  published image digest (used by `start` / `export`). Useful when the digest
  must be resolved from a different endpoint than the build/push registry, such
  as an internal HTTP registry.
- `KUBER_REGISTRY_CONFIG`: path to the Docker config file with registry
  credentials (see above).
- `KUBER_REGISTRY_SECRET`: the image pull Secret mounted for BuildKit's
  registry access.
- `KUBER_BUILDKIT_IMAGE`: override the BuildKit runner image used for builds.
- `KUBER_BUILD_DATA_CLAIM`: the PVC claim backing builds.
- `KUBER_BUILD_RECONCILE_MS` (default `30000`): the background build
  reconciliation interval in milliseconds. Values must be greater than zero and
  no greater than `2147483647` (the JavaScript timer maximum); invalid values
  use the default.
- `KUBER_BUILD_RECONCILE_TIMEOUT_MS` (default `20000`, maximum `25000`): the
  deadline for one background build-reconciliation scan in milliseconds. The
  maximum leaves time within the 30-second reconciliation lease for normal
  renewal or release. The reconciler renews both its workspace and per-build
  leases every 10 seconds for the lifetime of a generation, including while an
  observation, log read, or store call is pending. On timeout its abort signal
  is cancelled and logged, but Kubernetes requests may be unabortable; the
  generation remains active and continues its lease heartbeat until that request
  settles, so a later scan cannot overlap it.

See [Server Deployment](#server-deployment) for how `compose.yml` wires the
internal registry variables for the kuber-server pod.

## Account Recovery

If you lose your credentials and cannot log in:

1. Recreate the bootstrap admin by deploying with
   `KUBER_BOOTSTRAP_PASSWORD` set again:
   ```bash
   KUBER_BOOTSTRAP_PASSWORD='new-password' kuber up --no-b
   kuber restart kuber-server
   ```
2. The server only creates the bootstrap user if the account does not already
   exist, so a fresh `kuber login <username>` with the new password works, or
   use the newly created admin to reset other accounts:
   ```bash
   kuber users update <username> --password
   ```
3. After recovering, reconcile without `KUBER_BOOTSTRAP_PASSWORD` and restart
   so the bootstrap Secret is removed and the password leaves the pod
   environment.

Because user records and session hashes are stored as Secrets in
`kuber-system`, recovery relies on cluster administrators being able to redeploy
the server with bootstrap credentials. `users revoke <username>` forcibly logs a
user out across all devices.

## Next.js Example

[`example/`](example/) contains a documented deployment template for adding
kuber to an existing Bun-powered Next.js project without initializing or
bundling an application in this repository. It includes a standalone-output
Dockerfile, `.dockerignore`, `compose.yml`, and the required Next.js
configuration.

## Running

During development:

```bash
bun run index.ts up
```

Run the dedicated unit suite and type checks:

```bash
bun run test
bun run typecheck
```

Other useful commands:

```bash
bun run index.ts ps
bun run index.ts logs
bun run index.ts logs -f
bun run index.ts exec app sh
bun run index.ts start
bun run index.ts stop
bun run index.ts restart
bun run index.ts rollback
bun run index.ts fuck app
bun run index.ts db ls
bun run index.ts s3 ls
bun run index.ts s3 creds app
bun run index.ts s3 ui app
bun run index.ts login dmgnr
bun run index.ts users ls
bun run index.ts operations ls
bun run index.ts audit ls
```

All commands accept `--config` to use a configuration file other than
`.kuberrc.ts`:

```bash
kuber --config production.kuberrc.ts up
kuber up --config production.kuberrc.ts
```

`login`, `logout`, and `whoami` are context-free and do not require a
configuration.

### Shell Completion

Generate and load completions for your shell:

```bash
source <(kuber complete zsh)
source <(kuber complete bash)
```

For a permanent setup, write the generated script to a file and source it from
your shell configuration. Fish and PowerShell are also supported through
`kuber complete fish` and `kuber complete powershell`.

## Commands

- `up [--no-b]`: build images if needed, ensure the workspace, reconcile managed
  Postgres/S3, render manifests, apply them, wait for rollout, and delete stale
  resources
- `start`: like `up` but re-resolves the currently published image digests
  instead of building
- `login [username] [--persist]`: authenticate with the kuber API
- `logout`: revoke and remove the current API session
- `whoami`: show the authenticated API user and roles
- `users`: administer user accounts and roles
- `operations`: inspect server-side reconciliation operations
- `audit`: inspect the audit trail
- `ps [-a]`: print an ANSI graph of the current project namespace, hiding stopped
  deployments by default
- `logs [deployment] [-f]`: print (or follow) logs for one deployment or all
  managed deployments
- `exec <deployment> <command...>`: execute a command inside a running
  deployment pod over an interactive WebSocket
- `restart [deployment]`: roll out a restart across managed deployments
- `stop`: delete the matching name-scoped HPAs (so autoscaling cannot scale
  replicas back up) and scale managed deployments to zero
- `rollback` (alias `fuck`) `[deployment]`: roll one deployment back to its
  previous release, or all managed deployments when no name is given
- `down [-f]`: delete managed resources while keeping ingress, PVCs, managed
  databases, and managed S3 storage; `-f` also deletes those and the namespace
- `db ls` / `db creds <service>`: list or print credentials for managed Postgres
  claims
- `s3 ls` / `s3 creds <service>` / `s3 ui <service>`: list managed S3 claims,
  print their credentials, or print the Garage UI URL for a bucket
- `export [-o file]`: render manifests to a YAML file without applying them

Lifecycle commands (`restart`, `stop`, `rollback`, `down`) are idempotent:
identical requests are deduplicated server-side and tracked as operations.

## Configuration

Kuber optionally loads `.kuberrc.ts` from the working directory. The file must
default export an object satisfying the published `KuberConfig` type:

```ts
import type { KuberConfig } from "@dmgnr/kuber";

export default {
  project: "my-app",
  composeFile: "compose.production.yml",
  registry: "registry.example.com",
  rolloutTimeoutMs: 10 * 60_000,

  async compose(compose) {
    const app = compose.services?.app;
    if (app && !Array.isArray(app.environment)) {
      app.environment ??= {};
      app.environment.NEXT_PUBLIC_BUILD_ID =
        await Bun.$`git rev-parse --short HEAD`
          .text()
          .then((value) => value.trim());
    }
  },
} satisfies KuberConfig;
```

Operational defaults:

- `project`: Compose top-level `name`, falling back to the current working
  directory name
- `composeFile`: the first recognized Compose filename in the working directory
- `registry`: `registry.neko-piranha.ts.net`
- `rolloutTimeoutMs`: `300000`

Project-name precedence is `.kuberrc.ts project`, Compose top-level `name`, then
the current working directory name.

The `registry` value controls which registry the CLI requests build images from
and which the server uses to resolve published digests. `rolloutTimeoutMs`
bounds how long `up` and `rollback` wait for a Deployment rollout.

Configuration hooks can be synchronous or asynchronous and receive mutable
values:

- `compose(compose, context)`: once after parsing and validation; affects every
  command that reads Compose
- `preBuild(compose, context)`: before build eligibility is evaluated when
  builds are enabled
- `postBuild(result, context)`: after images are built; `result` contains
  `built` and `changed` service names
- `postRender(resources, context)`: after rendering and before reconciliation
  planning; also runs for `export`
- `postApply(resources, context)`: after desired resources are successfully
  applied

Hook context contains the resolved `cwd`, `project`, `composeFile`, and optional
`configFile`. A hook error aborts the command and is reported by the normal CLI
error handler.

Registry and rollout configuration remain part of the CLI-facing contract.
Image builder selection is not configurable: builds are scheduled, executed, and
owned entirely by the server.

## Compose Conventions

`kuber` supports a few project-specific Compose conventions on top of normal
service translation.

### Host-Based Ports

If a `ports` entry uses a hostname instead of a numeric published port, `kuber`
treats it as an ingress host and routes traffic to the target container port.

Example:

```yml
services:
  app:
    ports:
      - somedomain.astrxl.dev:3000
```

That produces a Kubernetes `Ingress` rule for `somedomain.astrxl.dev` pointing
at the service port for container port `3000`.

Single-level wildcard subdomains are supported. Quote wildcard entries so YAML
does not treat the leading `*` as an alias:

```yml
services:
  app:
    ports:
      - "*.astrxl.dev:3000"
      - "*.secure.astrxl.dev:3001:protected"
```

Protected routes use the kuber dialect and render Traefik `IngressRoute`
resources instead of plain Kubernetes `Ingress`:

```yml
services:
  app:
    ports:
      - db.astrxl.dev:4984:protected
      - status.astrxl.dev:3001:protected(/dashboard,/socket.io)
```

Translation rules:

- `host:port` -> Kubernetes `Ingress`
- `host:port:protected` -> Traefik `IngressRoute` with middleware `routing/cf-auth` and host-wide matching
- `host:port:protected(path1,path2,...)` -> Traefik `IngressRoute` with middleware `routing/cf-auth` and explicit `PathPrefix(...)` matches only

### Replicas and Autoscaling

`deploy.replicas` (or the top-level `scale` field) controls the Deployment
replica count. A plain integer or numeric string renders a fixed `replicas`
value, with `scale` taking precedence over `deploy.replicas`.

A `"min-max"` range string requests autoscaling instead of a fixed count:

```yml
services:
  app:
    image: app
    deploy:
      replicas: "2-6"
```

kuber renders:

- a `Deployment` with `replicas` set to the range minimum (`2`)
- a `HorizontalPodAutoscaler` (`autoscaling/v2`) targeting that Deployment,
  with `minReplicas: 2`, `maxReplicas: 6`, and a CPU target of 80%
  utilization
- a `100m` CPU request injected into the container, unless `x-container`
  already specifies a CPU request (the HPA needs a CPU request to scale on)

For both fixed counts above one and autoscaled ranges whose maximum exceeds
one, kuber also adds a `topologySpreadConstraints` entry spreading pods across
hosts (`kubernetes.io/hostname`, `maxSkew: 1`,
`whenUnsatisfiable: ScheduleAnyway`).

Malformed non-numeric replica values (for example `"lots"`) are rejected with
a clear error instead of silently defaulting.

### Managed Postgres

You can declare a managed Postgres database with a pseudo-volume:

```yml
services:
  app:
    volumes:
      - postgresql:app
```

Or with an explicit username and database name:

```yml
services:
  app:
    volumes:
      - postgresql:user/database
```

This creates or reuses the managed CNPG role secret, reconciles the database
resource, and injects `DATABASE_URL` and
`REDIS_URL=redis://redis.database.svc.cluster.local` into the generated app
secret in Kubernetes. `REDIS_URL` is only added to services with a managed
Postgres claim. Running `kuber db creds <service>` performs the same focused
Secret, role, and Database reconciliation before printing credentials.

### Managed S3

Declare a Garage S3 bucket and access key with a pseudo-volume:

```yml
services:
  app:
    volumes:
      - s3:app
```

This creates `GarageBucket/app` and `GarageKey/app` in `garage-system`. To use
different key and bucket names:

```yml
services:
  app:
    volumes:
      - s3:app-key/shared-assets
```

The Garage operator generates the credentials. `kuber` reads its generated
Secret and injects these values into the service's `<service>-env` Secret:

- `AWS_ACCESS_KEY_ID`
- `AWS_SECRET_ACCESS_KEY`
- `AWS_ENDPOINT_URL_S3`
- `AWS_REGION`
- `S3_BUCKET`

One service can declare both `postgresql:...` and `s3:...`; all generated
values are merged into the same service Secret. Managed Garage buckets and keys
are retained by normal `down` and deleted by `down -f`.

Inspect a claim, print its generated credentials, or get its Garage UI URL:

```bash
kuber s3 ls
kuber s3 creds app
kuber s3 ui app
```

`s3 creds` prints `AWS_ACCESS_KEY_ID`, `AWS_SECRET_ACCESS_KEY`,
`AWS_ENDPOINT_URL_S3`, `AWS_REGION`, and `S3_BUCKET` as shell-style environment
assignments. `s3 ui` only prints the URL; it does not open a browser.

### Environment Files

`env_file` entries are read locally and turned into a Kubernetes `Secret` named
`<service>-env`. Deployments then consume that secret through `envFrom`.

This is also where generated values such as `DATABASE_URL` and the managed S3
environment are injected.

### Volumes

`kuber` treats different volume shapes differently:

- file bind mounts become ConfigMaps
- directory bind mounts become PVC-backed mounts
- named volumes become PVC-backed mounts
- `tmpfs` becomes `emptyDir` with memory backing
- `postgresql:...` is treated as a managed database claim, not as a filesystem mount
- `s3:...` is treated as a managed object-storage claim, not as a filesystem mount

Named volumes also support kuber-specific Longhorn storage hints. Kuber renders
each distinct placement policy as a deterministic, reusable Longhorn
`StorageClass`, then references that class from the PVC. The generated class
uses Longhorn's `numberOfReplicas`, `diskSelector`, and `dataLocality`
parameters; placement fields are never written directly to the PVC.

Default behavior:

```yml
# compose
services:
  app:
    volumes:
      - myvolume:/data

# effective kuber interpretation
services:
  app:
    volumes:
      - myvolume(1Gi on 2 fast):/data
```

Short syntax:

```yml
services:
  app:
    volumes:
      - data(20Gi):/data
      - archive(200Gi on archive):/archive
      - cache(10Gi on 1 fast):/cache
```

Meaning:

- `name(20Gi):/path` -> PVC size `20Gi`
- `name(20Gi on archive):/path` -> PVC size `20Gi`, with a StorageClass using `diskSelector: "archive"` and disabled data locality
- `name(20Gi on 1 archive):/path` -> PVC size `20Gi`, with a StorageClass using one replica and `diskSelector: "archive"`

Explicit extensions are also supported.

Top-level named volume:

```yml
volumes:
  data:
    x-size: 20Gi
    x-diskTag: [archive]
    x-replicaCount: 1
    x-dataLocality: none
```

Long-form service mount:

```yml
services:
  app:
    volumes:
      - type: volume
        source: data
        target: /data
        volume:
          x-size: 20Gi
          x-diskTag: [archive]
          x-replicaCount: 1
          x-dataLocality: none
```

Precedence:

- short syntax like `data(20Gi on 1 archive):/data`
- long-form `volume.x-*`
- top-level `volumes.<name>.x-*`
- fallback default `1Gi on 2 fast`

StorageClasses are cluster-scoped and content-addressed by policy. They are
shared across projects and intentionally retained when a project is removed.

## Building

When a service declares `build`, the CLI:

1. snapshots the repository into a content-addressed workspace
   (committed git state, tracked changes, untracked files, and ignored `.env*`
   files),
2. negotiates with the server and uploads only the blobs it is missing,
3. submits a build request; the server materializes the workspace from the CAS
   onto a shared RWX PVC and runs a rootless BuildKit Job that builds and pushes
   the configured image with registry cache.

Build containers are restricted: they run as non-root (`runAsUser`/`runAsGroup`
`1000`), do not mount the service account token, and only read the workspace
(read-only mount) and a writable BuildKit state `emptyDir`. After a push, the
registry's manifest digest is captured and embedded into the rendered Deployment
as an immutable `:latest@sha256:...` reference, so a changed image naturally
triggers a rollout. `start` and `export` look up the currently published digest
without rebuilding, and fail if a buildable service has no published image yet.

`export` is side-effect-free: it refuses to render managed Postgres or S3 claims
(because it cannot call the server to generate credentials) and instead tells
you to run `kuber up` or remove the managed provider claims.

## Rollback

`kuber rollback [deployment]` (alias `fuck`) rewinds managed Deployments to the
previous release. ReplicaSets carry a `deployment.kubernetes.io/revision`
annotation, and rollback restores the complete pod template from the next-older
ReplicaSet via a JSON Patch, then waits for the rollout to complete. With no
argument every managed Deployment is rolled back; pass a deployment name to
target a single one.

Notes and limitations:

- Kubernetes only keeps its most recent ReplicaSets, so an older release may no
  longer be reachable after enough successful rollouts/rollbacks.
- Rollback restores the pod template (including image and environment), not live
  Secret, ConfigMap, PVC, database, or S3 state.
- A later `kuber up` or `kuber start` re-resolves `:latest` and returns the
  Deployment to the current desired state anyway, so rollback is the right tool
  for responding to a bad deploy, not for permanently pinning an old version.
- Rollback only considers Deployments managed by kuber
  (`app.kubernetes.io/managed-by=kuber`) and only runs within a workspace whose
  namespace kuber owns.

## Workspace State and Operations

The server persists per-workspace state, revisions, operations, and audit
events as Secrets/ConfigMaps in `kuber-system`. Mutations are idempotent:

- operations carry an idempotency key so retries do not double-apply,
- resource deletion requires a UID precondition,
- workspace replacement is guarded by If-Match.

The CLI is built with the normal `build` script for distribution and local
use:

```bash
bun run build
```

## Notes

- Resource names and namespaces are derived from the current working directory.
- The workspace snapshot is optimized for local iteration, not for producing a
  perfectly clean export of the repository.
- Managed database support is Kubernetes-only. It injects `DATABASE_URL` into
  the generated app secret and does not rewrite local `.env` files.
- `kuber` operates on managed resources in the namespace matching the current
  directory name.
- Builds are scheduled, executed, and owned by the server. There is no local
  SSH/daemon builder configuration; `registry` and `rolloutTimeoutMs` remain
  CLI-facing settings.