feat: add archive module

registry/coder-labs/modules/archive/README.md

@@ -0,0 +1,163 @@
+---
+display_name: Archive
+description: Create automated and user-invocable scripts that archive and extract selected files/directories with optional compression (gzip or zstd).
+icon: ../../../../.icons/folder.svg
+verified: false
+tags: [backup, archive, tar, helper]
+---
+
+# Archive
+
+This module installs small, robust scripts in your workspace to create and extract tar archives from a list of files and directories. It supports optional compression (gzip or zstd). The create command prints only the resulting archive path to stdout; operational logs go to stderr. An optional stop hook can also create an archive automatically when the workspace stops, and an optional start hook can wait for an archive on-disk and extract it on start.
+
+```tf
+module "archive" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/archive/coder"
+  version  = "0.0.1"
+  agent_id = coder_agent.example.id
+
+  paths = ["./projects", "./code"]
+}
+```
+
+## Features
+
+- Installs two commands into the workspace `$PATH`: `coder-archive-create` and `coder-archive-extract`.
+- Creates a single `.tar`, `.tar.gz`, or `.tar.zst` containing selected paths (depends on `tar`).
+- Optional compression: `gzip`, `zstd` (depends on `gzip` or `zstd`).
+- Stores defaults so commands can be run without arguments (supports overriding via CLI flags).
+- Logs and status messages go to stderr, the create command prints only the final archive path to stdout.
+- Optional:
+  - `create_on_stop` to create an archive automatically when the workspace stops.
+  - `extract_on_start` to wait for an archive to appear and extract it on start.
+
+> [!WARNING]
+> The `create_on_stop` feature uses the `coder_script` `run_on_stop` which may not work as expected on certain templates without additional provider configuration. The agent may be terminated before the script completes. See [coder/coder#6174](https://github.com/coder/coder/issues/6174) for provider-specific workarounds and [coder/coder#6175](https://github.com/coder/coder/issues/6175) for tracking a fix.
+
+## Usage
+
+Basic example:
+
+```tf
+module "archive" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/archive/coder"
+  version  = "0.0.1"
+  agent_id = coder_agent.example.id
+
+  # Paths to include in the archive (files or directories).
+  directory = "~"
+  paths = [
+    "./projects",
+    "./code",
+  ]
+}
+```
+
+Customize compression and output:
+
+```tf
+module "archive" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/archive/coder"
+  version  = "0.0.1"
+  agent_id = coder_agent.example.id
+
+  directory    = "/"
+  paths        = ["/etc", "/home"]
+  compression  = "zstd"        # "gzip" | "zstd" | "none"
+  output_dir   = "/tmp/backup" # defaults to /tmp
+  archive_name = "my-backup"   # base name (extension is inferred from compression)
+}
+```
+
+Enable auto-archive on stop:
+
+```tf
+module "archive" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/archive/coder"
+  version  = "0.0.1"
+  agent_id = coder_agent.example.id
+
+  # Creates /tmp/coder-archive.tar.gz of the users home directory (defaults).
+  create_on_stop = true
+}
+```
+
+Extract on start:
+
+```tf
+module "archive" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/coder-labs/archive/coder"
+  version  = "0.0.1"
+  agent_id = coder_agent.example.id
+
+  # Where to look for the archive file to extract:
+  output_dir   = "/tmp"
+  archive_name = "my-archive"
+  compression  = "gzip"
+
+  # Waits up to 5 minutes for /tmp/my-archive.tar.gz to be present, note that
+  # using a long timeout will delay every workspace start by this much until the
+  # archive is present.
+  extract_on_start             = true
+  extract_wait_timeout_seconds = 300
+}
+```
+
+## Command usage
+
+The installer writes the following files:
+
+- `$CODER_SCRIPT_DATA_DIR/archive-lib.sh`
+- `$CODER_SCRIPT_BIN_DIR/coder-archive-create`
+- `$CODER_SCRIPT_BIN_DIR/coder-archive-extract`
+
+Create usage:
+
+```console
+coder-archive-create [OPTIONS] [PATHS...]
+  -c, --compression <gzip|zstd|none>   Compression algorithm (default from module)
+  -C, --directory <DIRECTORY>          Change to directory for archiving (default from module)
+  -f, --file <ARCHIVE>                 Output archive file (default from module)
+  -h, --help                           Show help
+```
+
+Extract usage:
+
+```console
+coder-archive-extract [OPTIONS]
+  -c, --compression <gzip|zstd|none>   Compression algorithm (default from module)
+  -C, --directory <DIRECTORY>          Extract into directory (default from module)
+  -f, --file <ARCHIVE>                 Archive file to extract (default from module)
+  -h, --help                           Show help
+```
+
+Examples:
+
+- Use Terraform defaults:
+
+  ```
+  coder-archive-create
+  ```
+
+- Override compression and output file at runtime:
+
+  ```
+  coder-archive-create --compression zstd --file /tmp/backups/archive.tar.zst
+  ```
+
+- Add extra paths on the fly (in addition to the Terraform defaults):
+
+  ```
+  coder-archive-create /etc/hosts
+  ```
+
+- Extract an archive into a directory:
+
+  ```
+  coder-archive-extract --file /tmp/backups/archive.tar.gz --directory /tmp/restore
+  ```

registry/coder-labs/modules/archive/archive.tftest.hcl

@@ -0,0 +1,33 @@
+mock_provider "coder" {}
+
+run "apply_defaults" {
+  command = apply
+
+  variables {
+    agent_id = "agent-123"
+    paths    = ["~/project", "/etc/hosts"]
+  }
+
+  assert {
+    condition     = output.archive_path == "/tmp/coder-archive.tar.gz"
+    error_message = "archive_path should be empty when archive_name is not set"
+  }
+}
+
+run "apply_with_name" {
+  command = apply
+
+  variables {
+    agent_id               = "agent-123"
+    paths                  = ["/etc/hosts"]
+    archive_name           = "nightly"
+    output_dir             = "/tmp/backups"
+    compression            = "zstd"
+    create_archive_on_stop = true
+  }
+
+  assert {
+    condition     = output.archive_path == "/tmp/backups/nightly.tar.zst"
+    error_message = "archive_path should be computed from archive_name + output_dir + extension"
+  }
+}