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165e2495bf
This PR extracts the `fabro resume` subcommand from `fabro run`,
replacing the `--resume` and `--run-branch` flags with a dedicated, more
ergonomic interface. Users can now run `fabro resume <RUN_ID>` instead
of constructing `fabro run --run-branch fabro/run/<RUN_ID>` manually,
and the command also accepts run ID prefixes (matching the pattern
established by `fabro rewind` and `fabro fork`). Checkpoint-file-based
resumption is also supported via `fabro resume --checkpoint
path/to/checkpoint.json --workflow workflow.fabro`.
The implementation moves the ~315-line `run_from_branch()` function out
of `run.rs` and into a new `commands/resume.rs` module, splitting it
into two preparation paths (`prepare_from_checkpoint` and
`prepare_from_branch`) that converge on a shared `run_resumed()` tail.
Several previously private helpers in `run.rs` are widened to
`pub(crate)` to allow sharing: `local_sandbox_with_callback`,
`resolve_ssh_config`, `resolve_ssh_clone_params`,
`resolve_preserve_sandbox`, `generate_retro`, `write_finalize_commit`,
`print_final_output`, `print_assets`, and the new `default_run_dir`
helper extracted from duplicated inline logic. The `RunArgs` struct
loses its `resume` and `run_branch` fields along with their
`conflicts_with` annotations, and `RunSpec` drops the corresponding
fields with `#[serde(default)]` for backward compatibility.
Documentation across `docs/reference/cli.mdx`,
`docs/execution/checkpoints.mdx`, and
`docs/core-concepts/how-fabro-works.mdx` is updated to reflect the new
interface, and the `rewind`/`fork` commands now hint `fabro resume
<short-prefix>` instead of the full branch name.
### Fabro Details
<details>
<summary>Ran 9 stages in 30m 25s for $6.70</summary>
| Stage | Duration | Cost | Retries |
|---|---|---|---|
| start | 0s | – | 0 |
| toolchain | 0s | – | 0 |
| preflight_compile | 1m 10s | – | 0 |
| preflight_lint | 13s | – | 0 |
| implement | 18m 30s | $3.95 | 0 |
| simplify_opus | 9m 38s | $2.75 | 0 |
| simplify_gpt | 0s | – | 0 |
| verify | 19s | – | 0 |
| fmt | 1s | – | 0 |
| **Total** | **30m 25s** | **$6.70** | **0** |
</details>
<details>
<summary>Ran <code>ImplementPlan.fabro</code> (12 nodes and 15
edges)</summary>
```dot
digraph ImplementPlan {
graph [
goal="Implement and simplify",
model_stylesheet="
* { model: claude-opus-4-6; }
"
]
rankdir=LR
start [shape=Mdiamond, label="Start"]
exit [shape=Msquare, label="Exit"]
toolchain [label="Toolchain", shape=parallelogram, script="command -v cargo >/dev/null || { curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y && sudo ln -sf $HOME/.cargo/bin/* /usr/local/bin/; }; cargo --version 2>&1", max_retries=0]
preflight_compile [label="Preflight Compile", shape=parallelogram, script="cargo check -q --workspace 2>&1", max_retries=0]
preflight_lint [label="Preflight Lint", shape=parallelogram, script="cargo clippy -q --workspace -- -D warnings 2>&1", max_retries=0]
fix_lints [label="Fix Lints", prompt="The preflight lint step failed. Read the build output from context and fix all clippy lint warnings.", max_visits=3]
implement [label="Implement", prompt="Read the plan file referenced in the goal and implement every step. Make all the code changes described in the plan. Use red/green TDD."]
simplify_opus [label="Simplify (Opus)", prompt="@prompts/simplify.md"]
simplify_gpt [label="Simplify (GPT-54)", prompt="@prompts/simplify.md", model="gpt-54"]
verify [label="Verify", shape=parallelogram, script="cargo clippy -q --workspace -- -D warnings 2>&1 && cargo nextest run --cargo-quiet --workspace --status-level fail 2>&1", goal_gate=true, retry_target="fixup"]
fixup [label="Fixup", prompt="The verify step failed. Read the build output from context and fix all clippy lint warnings and test failures.", max_visits=3]
fmt [label="Format", shape=parallelogram, script="cargo fmt --all 2>&1", max_retries=0]
start -> toolchain
toolchain -> preflight_compile [condition="outcome=success"]
toolchain -> exit
preflight_compile -> preflight_lint [condition="outcome=success"]
preflight_compile -> exit
preflight_lint -> implement [condition="outcome=success"]
preflight_lint -> fix_lints
fix_lints -> preflight_lint
implement -> simplify_opus -> simplify_gpt -> verify
verify -> fmt [condition="outcome=success"]
verify -> fixup
fixup -> verify
fmt -> exit
}
```
</details>
⚒️ Generated with [Fabro](https://fabro.sh)
---------
Co-authored-by: Fabro <noreply@fabro.sh>
Co-authored-by: Bryan Helmkamp <bryan@brynary.com>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
54 lines
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54 lines
1.7 KiB
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---
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title: "exe.dev (preview)"
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description: "Run Fabro workflows in fast ephemeral VMs from exe.dev"
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---
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<Warning>
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The exe.dev sandbox provider is **under development**. It requires building Fabro with the `exedev` feature flag enabled. The API and configuration may change.
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</Warning>
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[exe.dev](https://exe.dev) provides fast ephemeral cloud VMs for Fabro workflows. Each run gets a fresh VM with full machine-level isolation, connected via SSH.
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## How it works
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- Each run creates a new VM via the exe.dev management plane over SSH
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- Fabro clones the current git repository into the VM automatically (using GitHub App credentials for private repos)
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- Agent tool calls (shell commands, file edits, grep, glob) execute over SSH inside the VM
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- Git checkpointing commits agent changes to a remote branch between stages
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- Cancelling a run cleanly tears down the VM
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- VMs are destroyed automatically when the run finishes
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## Configuration
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```bash
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fabro run workflow.fabro --sandbox exe
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```
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```toml title="run.toml"
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[sandbox]
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provider = "exe"
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[sandbox.exe]
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image = "my-custom-image:latest"
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```
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| Field | Description |
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|---|---|
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| `image` | Custom container image for the VM. Optional — uses the exe.dev default when omitted. |
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## SSH access
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Connect to a running exe.dev sandbox via SSH for live debugging:
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```bash
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fabro ssh <run-id>
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```
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This prints the SSH connection command so you can connect to the VM while the workflow runs.
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## Prerequisites
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- SSH keys configured for exe.dev (added via the [exe.dev dashboard](https://exe.dev))
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- A [GitHub App](/integrations/github) configured via `fabro install` (for private repository cloning)
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See [Environments](/execution/environments#exe) for additional details on how the exe.dev sandbox operates.
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