feat: add --depth to git-clone module to support shallow clones (#197)

## Description

<!-- Briefly describe what this PR does and why -->

Adds support for a `depth` variable to the git-clone module. If a repo
is large, a shallow clone makes the `git clone` a lot faster

## Type of Change

- [ ] New module
- [ ] Bug fix
- [x] Feature/enhancement
- [ ] Documentation
- [ ] Other

## Module Information

<!-- Delete this section if not applicable -->

**Path:** `registry/coder/modules/git-clone`  
**New version:** `v1.0.19` ? 
**Breaking change:**
  - [ ] Yes
  - [x] No

## Testing & Validation

- [ ] Tests pass (`bun test`)
- [ ] Code formatted (`bun run fmt`)
- [ ] Changes tested locally

- `bun test` - I don't know if this is expected

   ```shell
   ✗ git-clone > fails without git [298.14ms]
   ✗ git-clone > runs with git [289.14ms]
✗ git-clone > runs with github clone with switch to feat/branch
[277.19ms]
✗ git-clone > runs with gitlab clone with switch to feat/branch
[293.49ms]
✗ git-clone > runs with github clone with branch_name set to feat/branch
[288.07ms]
   ```


## Related Issues

<!-- Link related issues or write "None" if not applicable -->

None

---------

Co-authored-by: EdwardAngert <17991901+EdwardAngert@users.noreply.github.com>
Co-authored-by: DevelopmentCats <christofer@coder.com>

registry/coder/modules/git-clone/README.md

@@ -15,7 +15,7 @@ This module allows you to automatically clone a repository by URL and skip if it
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://github.com/coder/coder"
 }
@@ -29,7 +29,7 @@ module "git-clone" {
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://github.com/coder/coder"
   base_dir = "~/projects/coder"
@@ -44,7 +44,7 @@ To use with [Git Authentication](https://coder.com/docs/v2/latest/admin/git-prov
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://github.com/coder/coder"
 }
@@ -70,7 +70,7 @@ data "coder_parameter" "git_repo" {
 module "git_clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = data.coder_parameter.git_repo.value
 }
@@ -104,7 +104,7 @@ Configuring `git-clone` for a self-hosted GitHub Enterprise Server running at `g
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://github.example.com/coder/coder/tree/feat/example"
   git_providers = {
@@ -123,7 +123,7 @@ To GitLab clone with a specific branch like `feat/example`
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://gitlab.com/coder/coder/-/tree/feat/example"
 }
@@ -135,7 +135,7 @@ Configuring `git-clone` for a self-hosted GitLab running at `gitlab.example.com`
 module "git-clone" {
   count    = data.coder_workspace.me.start_count
   source   = "registry.coder.com/coder/git-clone/coder"
-  version  = "1.0.18"
+  version  = "1.1.0"
   agent_id = coder_agent.example.id
   url      = "https://gitlab.example.com/coder/coder/-/tree/feat/example"
   git_providers = {
@@ -156,7 +156,7 @@ For example, to clone the `feat/example` branch:
 module "git-clone" {
   count       = data.coder_workspace.me.start_count
   source      = "registry.coder.com/coder/git-clone/coder"
-  version     = "1.0.18"
+  version     = "1.1.0"
   agent_id    = coder_agent.example.id
   url         = "https://github.com/coder/coder"
   branch_name = "feat/example"
@@ -165,7 +165,8 @@ module "git-clone" {
 
 ## Git clone with different destination folder
 
-By default, the repository will be cloned into a folder matching the repository name. You can use the `folder_name` attribute to change the name of the destination folder to something else.
+By default, the repository will be cloned into a folder matching the repository name.
+You can use the `folder_name` attribute to change the name of the destination folder to something else.
 
 For example, this will clone into the `~/projects/coder/coder-dev` folder:
 
@@ -173,10 +174,28 @@ For example, this will clone into the `~/projects/coder/coder-dev` folder:
 module "git-clone" {
   count       = data.coder_workspace.me.start_count
   source      = "registry.coder.com/coder/git-clone/coder"
-  version     = "1.0.18"
+  version     = "1.1.0"
   agent_id    = coder_agent.example.id
   url         = "https://github.com/coder/coder"
   folder_name = "coder-dev"
   base_dir    = "~/projects/coder"
 }
 ```
+
+## Git shallow clone
+
+Limit the clone history to speed-up workspace startup by setting `depth`.
+
+When `depth` is greater than `0` the module runs `git clone --depth <depth>`.
+If not defined, the default, `0`, performs a full clone.
+
+```tf
+module "git-clone" {
+  count    = data.coder_workspace.me.start_count
+  source   = "registry.coder.com/modules/git-clone/coder"
+  version  = "1.1.0"
+  agent_id = coder_agent.example.id
+  url      = "https://github.com/coder/coder"
+  depth    = 1
+}
+```

registry/coder/modules/git-clone/main.tf

@@ -56,6 +56,12 @@ variable "folder_name" {
   default     = ""
 }
 
+variable "depth" {
+  description = "If > 0, perform a shallow clone using this depth."
+  type        = number
+  default     = 0
+}
+
 locals {
   # Remove query parameters and fragments from the URL
   url = replace(replace(var.url, "/\\?.*/", ""), "/#.*/", "")
@@ -113,6 +119,7 @@ resource "coder_script" "git_clone" {
     CLONE_PATH = local.clone_path,
     REPO_URL : local.clone_url,
     BRANCH_NAME : local.branch_name,
+    DEPTH = var.depth,
   })
   display_name       = "Git Clone"
   icon               = "/icon/git.svg"

registry/coder/modules/git-clone/run.sh

@@ -5,6 +5,7 @@ CLONE_PATH="${CLONE_PATH}"
 BRANCH_NAME="${BRANCH_NAME}"
 # Expand home if it's specified!
 CLONE_PATH="$${CLONE_PATH/#\~/$${HOME}}"
+DEPTH="${DEPTH}"
 
 # Check if the variable is empty...
 if [ -z "$REPO_URL" ]; then
@@ -36,11 +37,19 @@ fi
 if [ -z "$(ls -A "$CLONE_PATH")" ]; then
   if [ -z "$BRANCH_NAME" ]; then
     echo "Cloning $REPO_URL to $CLONE_PATH..."
+    if [ "$DEPTH" -gt 0 ]; then
+      git clone --depth "$DEPTH" "$REPO_URL" "$CLONE_PATH"
+    else
       git clone "$REPO_URL" "$CLONE_PATH"
+    fi
   else
     echo "Cloning $REPO_URL to $CLONE_PATH on branch $BRANCH_NAME..."
+    if [ "$DEPTH" -gt 0 ]; then
+      git clone --depth "$DEPTH" -b "$BRANCH_NAME" "$REPO_URL" "$CLONE_PATH"
+    else
       git clone "$REPO_URL" -b "$BRANCH_NAME" "$CLONE_PATH"
     fi
+  fi
 else
   echo "$CLONE_PATH already exists and isn't empty, skipping clone!"
   exit 0