git: clone --shared implemented

1 files changed, 172 insertions, 172 deletions

diff --git a/COMPATIBILITY.md b/COMPATIBILITY.md
index afd4f03..bbffea5 100644
--- a/COMPATIBILITY.md
+++ b/COMPATIBILITY.md
@@ -5,229 +5,229 @@ compatibility status with go-git.
 
 ## Getting and creating repositories
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `init` | | ✅ | | |
-| `init` | `--bare` | ✅ | | |
-| `init` | `--template` <br/> `--separate-git-dir` <br/> `--shared` | ❌ | | |
-| `clone` | | ✅ | | - [PlainClone](_examples/clone/main.go) |
-| `clone` | Authentication: <br/> - none <br/> - access token <br/> - username + password <br/> - ssh | ✅ | | - [clone ssh](_examples/clone/auth/ssh/main.go) <br/> - [clone access token](_examples/clone/auth/basic/access_token/main.go) <br/> - [clone user + password](_examples/clone/auth/basic/username_password/main.go) |
-| `clone` | `--progress` <br/> `--single-branch` <br/> `--depth` <br/> `--origin` <br/> `--recurse-submodules` | ✅ | | - [recurse submodules](_examples/clone/main.go) <br/> - [progress](_examples/progress/main.go) |
+| Feature | Sub-feature                                                                                                        | Status | Notes | Examples                                                                                                                                                                                                            |
+| ------- | ------------------------------------------------------------------------------------------------------------------ | ------ | ----- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `init`  |                                                                                                                    | ✅     |       |                                                                                                                                                                                                                     |
+| `init`  | `--bare`                                                                                                           | ✅     |       |                                                                                                                                                                                                                     |
+| `init`  | `--template` <br/> `--separate-git-dir` <br/> `--shared`                                                           | ❌     |       |                                                                                                                                                                                                                     |
+| `clone` |                                                                                                                    | ✅     |       | - [PlainClone](_examples/clone/main.go)                                                                                                                                                                             |
+| `clone` | Authentication: <br/> - none <br/> - access token <br/> - username + password <br/> - ssh                          | ✅     |       | - [clone ssh](_examples/clone/auth/ssh/main.go) <br/> - [clone access token](_examples/clone/auth/basic/access_token/main.go) <br/> - [clone user + password](_examples/clone/auth/basic/username_password/main.go) |
+| `clone` | `--progress` <br/> `--single-branch` <br/> `--depth` <br/> `--origin` <br/> `--recurse-submodules` <br/>`--shared` | ✅     |       | - [recurse submodules](_examples/clone/main.go) <br/> - [progress](_examples/progress/main.go)                                                                                                                      |
 
 ## Basic snapshotting
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `add` | | ✅ | Plain add is supported. Any other flags aren't supported | |
-| `status` | | ✅ | | |
-| `commit` | | ✅ | | - [commit](_examples/commit/main.go) |
-| `reset` | | ✅ | | |
-| `rm` | | ✅ | | |
-| `mv` | | ✅ | | |
+| Feature  | Sub-feature | Status | Notes                                                    | Examples                             |
+| -------- | ----------- | ------ | -------------------------------------------------------- | ------------------------------------ |
+| `add`    |             | ✅     | Plain add is supported. Any other flags aren't supported |                                      |
+| `status` |             | ✅     |                                                          |                                      |
+| `commit` |             | ✅     |                                                          | - [commit](_examples/commit/main.go) |
+| `reset`  |             | ✅     |                                                          |                                      |
+| `rm`     |             | ✅     |                                                          |                                      |
+| `mv`     |             | ✅     |                                                          |                                      |
 
 ## Branching and merging
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `branch` | | ✅ | | - [branch](_examples/branch/main.go) |
-| `checkout` | | ✅ | Basic usages of checkout are supported. | - [checkout](_examples/checkout/main.go) |
-| `merge` | | ❌ | | |
-| `mergetool` | | ❌ | | |
-| `stash` | | ❌ | | |
-| `tag` | | ✅ | | - [tag](_examples/tag/main.go) <br/> - [tag create and push](_examples/tag-create-push/main.go) |
+| Feature     | Sub-feature | Status | Notes                                   | Examples                                                                                        |
+| ----------- | ----------- | ------ | --------------------------------------- | ----------------------------------------------------------------------------------------------- |
+| `branch`    |             | ✅     |                                         | - [branch](_examples/branch/main.go)                                                            |
+| `checkout`  |             | ✅     | Basic usages of checkout are supported. | - [checkout](_examples/checkout/main.go)                                                        |
+| `merge`     |             | ❌     |                                         |                                                                                                 |
+| `mergetool` |             | ❌     |                                         |                                                                                                 |
+| `stash`     |             | ❌     |                                         |                                                                                                 |
+| `tag`       |             | ✅     |                                         | - [tag](_examples/tag/main.go) <br/> - [tag create and push](_examples/tag-create-push/main.go) |
 
 ## Sharing and updating projects
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `fetch` | | ✅ | | |
-| `pull` | | ✅ | Only supports merges where the merge can be resolved as a fast-forward. | - [pull](_examples/pull/main.go) |
-| `push` | | ✅ | | - [push](_examples/push/main.go) |
-| `remote` | | ✅ | | - [remotes](_examples/remotes/main.go) |
-| `submodule` | | ✅ | | - [submodule](_examples/submodule/main.go) |
-| `submodule` | deinit | ❌ | | |
+| Feature     | Sub-feature | Status | Notes                                                                   | Examples                                   |
+| ----------- | ----------- | ------ | ----------------------------------------------------------------------- | ------------------------------------------ |
+| `fetch`     |             | ✅     |                                                                         |                                            |
+| `pull`      |             | ✅     | Only supports merges where the merge can be resolved as a fast-forward. | - [pull](_examples/pull/main.go)           |
+| `push`      |             | ✅     |                                                                         | - [push](_examples/push/main.go)           |
+| `remote`    |             | ✅     |                                                                         | - [remotes](_examples/remotes/main.go)     |
+| `submodule` |             | ✅     |                                                                         | - [submodule](_examples/submodule/main.go) |
+| `submodule` | deinit      | ❌     |                                                                         |                                            |
 
 ## Inspection and comparison
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `show` | | ✅ | | |
-| `log` | | ✅ | | - [log](_examples/log/main.go) |
-| `shortlog` | | (see log) | | |
-| `describe` | | ❌ | | |
+| Feature    | Sub-feature | Status    | Notes | Examples                       |
+| ---------- | ----------- | --------- | ----- | ------------------------------ |
+| `show`     |             | ✅        |       |                                |
+| `log`      |             | ✅        |       | - [log](_examples/log/main.go) |
+| `shortlog` |             | (see log) |       |                                |
+| `describe` |             | ❌        |       |                                |
 
 ## Patching
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `apply` | | ❌ | | |
-| `cherry-pick` | | ❌ | | |
-| `diff` | | ✅ | Patch object with UnifiedDiff output representation. | |
-| `rebase` | | ❌ | | |
-| `revert` | | ❌ | | |
+| Feature       | Sub-feature | Status | Notes                                                | Examples |
+| ------------- | ----------- | ------ | ---------------------------------------------------- | -------- |
+| `apply`       |             | ❌     |                                                      |          |
+| `cherry-pick` |             | ❌     |                                                      |          |
+| `diff`        |             | ✅     | Patch object with UnifiedDiff output representation. |          |
+| `rebase`      |             | ❌     |                                                      |          |
+| `revert`      |             | ❌     |                                                      |          |
 
 ## Debugging
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `bisect` | | ❌ | | |
-| `blame` | | ✅ | | - [blame](_examples/blame/main.go) |
-| `grep` | | ✅ | | |
+| Feature  | Sub-feature | Status | Notes | Examples                           |
+| -------- | ----------- | ------ | ----- | ---------------------------------- |
+| `bisect` |             | ❌     |       |                                    |
+| `blame`  |             | ✅     |       | - [blame](_examples/blame/main.go) |
+| `grep`   |             | ✅     |       |                                    |
 
 ## Email
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `am` | | ❌ | | |
-| `apply` | | ❌ | | |
-| `format-patch` | | ❌ | | |
-| `send-email` | | ❌ | | |
-| `request-pull` | | ❌ | | |
+| Feature        | Sub-feature | Status | Notes | Examples |
+| -------------- | ----------- | ------ | ----- | -------- |
+| `am`           |             | ❌     |       |          |
+| `apply`        |             | ❌     |       |          |
+| `format-patch` |             | ❌     |       |          |
+| `send-email`   |             | ❌     |       |          |
+| `request-pull` |             | ❌     |       |          |
 
 ## External systems
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `svn` | | ❌ | | |
-| `fast-import` | | ❌ | | |
-| `lfs` | | ❌ | | |
+| Feature       | Sub-feature | Status | Notes | Examples |
+| ------------- | ----------- | ------ | ----- | -------- |
+| `svn`         |             | ❌     |       |          |
+| `fast-import` |             | ❌     |       |          |
+| `lfs`         |             | ❌     |       |          |
 
 ## Administration
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `clean` | | ✅ | | |
-| `gc` | | ❌ | | |
-| `fsck` | | ❌ | | |
-| `reflog` | | ❌ | | |
-| `filter-branch` | | ❌ | | |
-| `instaweb` | | ❌ | | |
-| `archive` | | ❌ | | |
-| `bundle` | | ❌ | | |
-| `prune` | | ❌ | | |
-| `repack` | | ❌ | | |
+| Feature         | Sub-feature | Status | Notes | Examples |
+| --------------- | ----------- | ------ | ----- | -------- |
+| `clean`         |             | ✅     |       |          |
+| `gc`            |             | ❌     |       |          |
+| `fsck`          |             | ❌     |       |          |
+| `reflog`        |             | ❌     |       |          |
+| `filter-branch` |             | ❌     |       |          |
+| `instaweb`      |             | ❌     |       |          |
+| `archive`       |             | ❌     |       |          |
+| `bundle`        |             | ❌     |       |          |
+| `prune`         |             | ❌     |       |          |
+| `repack`        |             | ❌     |       |          |
 
 ## Server admin
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `daemon` | | ❌ | | |
-| `update-server-info` | | ❌ | | |
+| Feature              | Sub-feature | Status | Notes | Examples |
+| -------------------- | ----------- | ------ | ----- | -------- |
+| `daemon`             |             | ❌     |       |          |
+| `update-server-info` |             | ❌     |       |          |
 
 ## Advanced
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `notes` | | ❌ | | |
-| `replace` | | ❌ | | |
-| `worktree` | | ❌ | | |
-| `annotate` | | (see blame) | | |
+| Feature    | Sub-feature | Status      | Notes | Examples |
+| ---------- | ----------- | ----------- | ----- | -------- |
+| `notes`    |             | ❌          |       |          |
+| `replace`  |             | ❌          |       |          |
+| `worktree` |             | ❌          |       |          |
+| `annotate` |             | (see blame) |       |          |
 
 ## GPG
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `git-verify-commit` | | ✅ | | |
-| `git-verify-tag` | | ✅ | | |
+| Feature             | Sub-feature | Status | Notes | Examples |
+| ------------------- | ----------- | ------ | ----- | -------- |
+| `git-verify-commit` |             | ✅     |       |          |
+| `git-verify-tag`    |             | ✅     |       |          |
 
 ## Plumbing commands
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `cat-file` | | ✅ | | |
-| `check-ignore` | | ❌ | | |
-| `commit-tree` | | ❌ | | |
-| `count-objects` | | ❌ | | |
-| `diff-index` | | ❌ | | |
-| `for-each-ref` | | ✅ | | |
-| `hash-object` | | ✅ | | |
-| `ls-files` | | ✅ | | |
-| `ls-remote` | | ✅ | | - [ls-remote](_examples/ls-remote/main.go) |
-| `merge-base` | `--independent` <br/> `--is-ancestor` | ⚠️ (partial) | Calculates the merge-base only between two commits. | - [merge-base](_examples/merge_base/main.go) |
-| `merge-base` | `--fork-point` <br/> `--octopus` | ❌ | | |
-| `read-tree` | | ❌ | | |
-| `rev-list` | | ✅ | | |
-| `rev-parse` | | ❌ | | |
-| `show-ref` | | ✅ | | |
-| `symbolic-ref` | | ✅ | | |
-| `update-index` | | ❌ | | |
-| `update-ref` | | ❌ | | |
-| `verify-pack` | | ❌ | | |
-| `write-tree` | | ❌ | | |
+| Feature         | Sub-feature                           | Status       | Notes                                               | Examples                                     |
+| --------------- | ------------------------------------- | ------------ | --------------------------------------------------- | -------------------------------------------- |
+| `cat-file`      |                                       | ✅           |                                                     |                                              |
+| `check-ignore`  |                                       | ❌           |                                                     |                                              |
+| `commit-tree`   |                                       | ❌           |                                                     |                                              |
+| `count-objects` |                                       | ❌           |                                                     |                                              |
+| `diff-index`    |                                       | ❌           |                                                     |                                              |
+| `for-each-ref`  |                                       | ✅           |                                                     |                                              |
+| `hash-object`   |                                       | ✅           |                                                     |                                              |
+| `ls-files`      |                                       | ✅           |                                                     |                                              |
+| `ls-remote`     |                                       | ✅           |                                                     | - [ls-remote](_examples/ls-remote/main.go)   |
+| `merge-base`    | `--independent` <br/> `--is-ancestor` | ⚠️ (partial) | Calculates the merge-base only between two commits. | - [merge-base](_examples/merge_base/main.go) |
+| `merge-base`    | `--fork-point` <br/> `--octopus`      | ❌           |                                                     |                                              |
+| `read-tree`     |                                       | ❌           |                                                     |                                              |
+| `rev-list`      |                                       | ✅           |                                                     |                                              |
+| `rev-parse`     |                                       | ❌           |                                                     |                                              |
+| `show-ref`      |                                       | ✅           |                                                     |                                              |
+| `symbolic-ref`  |                                       | ✅           |                                                     |                                              |
+| `update-index`  |                                       | ❌           |                                                     |                                              |
+| `update-ref`    |                                       | ❌           |                                                     |                                              |
+| `verify-pack`   |                                       | ❌           |                                                     |                                              |
+| `write-tree`    |                                       | ❌           |                                                     |                                              |
 
 ## Indexes and Git Protocols
 
-| Feature | Version | Status | Notes |
-|---|---|---|---|
-| index | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt) | ❌ | |
-| index | [v2](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt) | ✅ | |
-| index | [v3](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt) | ❌ | |
-| pack-protocol | [v1](https://github.com/git/git/blob/master/Documentation/gitprotocol-pack.txt) | ✅ | |
-| pack-protocol | [v2](https://github.com/git/git/blob/master/Documentation/gitprotocol-v2.txt) | ❌ | |
-| multi-pack-index | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt) | ❌ | |
-| pack-*.rev files | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt) | ❌ | |
-| pack-*.mtimes files | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt) | ❌ | |
-| cruft packs | | ❌ | |
+| Feature              | Version                                                                         | Status | Notes |
+| -------------------- | ------------------------------------------------------------------------------- | ------ | ----- |
+| index                | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt)  | ❌     |       |
+| index                | [v2](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt)  | ✅     |       |
+| index                | [v3](https://github.com/git/git/blob/master/Documentation/gitformat-index.txt)  | ❌     |       |
+| pack-protocol        | [v1](https://github.com/git/git/blob/master/Documentation/gitprotocol-pack.txt) | ✅     |       |
+| pack-protocol        | [v2](https://github.com/git/git/blob/master/Documentation/gitprotocol-v2.txt)   | ❌     |       |
+| multi-pack-index     | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt)   | ❌     |       |
+| pack-\*.rev files    | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt)   | ❌     |       |
+| pack-\*.mtimes files | [v1](https://github.com/git/git/blob/master/Documentation/gitformat-pack.txt)   | ❌     |       |
+| cruft packs          |                                                                                 | ❌     |       |
 
 ## Capabilities
 
-| Feature | Status | Notes |
-|---|---|---|
-| `multi_ack` | ❌ | |
-| `multi_ack_detailed` | ❌ | |
-| `no-done` | ❌ | |
-| `thin-pack` | ❌ | |
-| `side-band` | ⚠️ (partial) | |
-| `side-band-64k` | ⚠️ (partial) | |
-| `ofs-delta` | ✅ | |
-| `agent` | ✅ | |
-| `object-format` | ❌ | |
-| `symref` | ✅ | |
-| `shallow` | ✅ | |
-| `deepen-since` | ✅ | |
-| `deepen-not` | ❌ | |
-| `deepen-relative` | ❌ | |
-| `no-progress` | ✅ | |
-| `include-tag` | ✅ | |
-| `report-status` | ✅ | |
-| `report-status-v2` | ❌ | |
-| `delete-refs` | ✅ | |
-| `quiet` | ❌ | |
-| `atomic` | ✅ | |
-| `push-options` | ✅ | |
-| `allow-tip-sha1-in-want` | ✅ | |
-| `allow-reachable-sha1-in-want` | ❌ | |
-| `push-cert=<nonce>` | ❌ | |
-| `filter` | ❌ | |
-| `session-id=<session id>` | ❌ | |
+| Feature                        | Status       | Notes |
+| ------------------------------ | ------------ | ----- |
+| `multi_ack`                    | ❌           |       |
+| `multi_ack_detailed`           | ❌           |       |
+| `no-done`                      | ❌           |       |
+| `thin-pack`                    | ❌           |       |
+| `side-band`                    | ⚠️ (partial) |       |
+| `side-band-64k`                | ⚠️ (partial) |       |
+| `ofs-delta`                    | ✅           |       |
+| `agent`                        | ✅           |       |
+| `object-format`                | ❌           |       |
+| `symref`                       | ✅           |       |
+| `shallow`                      | ✅           |       |
+| `deepen-since`                 | ✅           |       |
+| `deepen-not`                   | ❌           |       |
+| `deepen-relative`              | ❌           |       |
+| `no-progress`                  | ✅           |       |
+| `include-tag`                  | ✅           |       |
+| `report-status`                | ✅           |       |
+| `report-status-v2`             | ❌           |       |
+| `delete-refs`                  | ✅           |       |
+| `quiet`                        | ❌           |       |
+| `atomic`                       | ✅           |       |
+| `push-options`                 | ✅           |       |
+| `allow-tip-sha1-in-want`       | ✅           |       |
+| `allow-reachable-sha1-in-want` | ❌           |       |
+| `push-cert=<nonce>`            | ❌           |       |
+| `filter`                       | ❌           |       |
+| `session-id=<session id>`      | ❌           |       |
 
 ## Transport Schemes
 
-| Scheme | Status | Notes | Examples |
-|---|---|---|---|
-| `http(s)://` (dumb)  | ❌ | | |
-| `http(s)://` (smart) | ✅ | | |
-| `git://`             | ✅ | | |
-| `ssh://`             | ✅ | | |
-| `file://`            | ⚠️ (partial) | Warning: this is not pure Golang. This shells out to the `git` binary. | |
-| Custom               | ✅ | All existing schemes can be replaced by custom implementations. | - [custom_http](_examples/custom_http/main.go) |
+| Scheme               | Status       | Notes                                                                  | Examples                                       |
+| -------------------- | ------------ | ---------------------------------------------------------------------- | ---------------------------------------------- |
+| `http(s)://` (dumb)  | ❌           |                                                                        |                                                |
+| `http(s)://` (smart) | ✅           |                                                                        |                                                |
+| `git://`             | ✅           |                                                                        |                                                |
+| `ssh://`             | ✅           |                                                                        |                                                |
+| `file://`            | ⚠️ (partial) | Warning: this is not pure Golang. This shells out to the `git` binary. |                                                |
+| Custom               | ✅           | All existing schemes can be replaced by custom implementations.        | - [custom_http](_examples/custom_http/main.go) |
 
 ## SHA256
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `init` | | ✅ | Requires building with tag sha256. |  - [init](_examples/sha256/main.go) |
-| `commit` | | ✅ | Requires building with tag sha256. |  - [commit](_examples/sha256/main.go) |
-| `pull` | | ❌ | | |
-| `fetch` | | ❌ | | |
-| `push` | | ❌ | | |
+| Feature  | Sub-feature | Status | Notes                              | Examples                             |
+| -------- | ----------- | ------ | ---------------------------------- | ------------------------------------ |
+| `init`   |             | ✅     | Requires building with tag sha256. | - [init](_examples/sha256/main.go)   |
+| `commit` |             | ✅     | Requires building with tag sha256. | - [commit](_examples/sha256/main.go) |
+| `pull`   |             | ❌     |                                    |                                      |
+| `fetch`  |             | ❌     |                                    |                                      |
+| `push`   |             | ❌     |                                    |                                      |
 
 ## Other features
 
-| Feature | Sub-feature | Status | Notes | Examples |
-|---|---|---|---|---|
-| `config` | `--local` | ✅  | Read and write per-repository (`.git/config`). | |
-| `config` | `--global` <br/> `--system` | ✅  | Read-only. | |
-| `gitignore` | | ✅ | | |
-| `gitattributes` | | ✅ | | |
-| `git-worktree` | | ❌ | Multiple worktrees are not supported. | |
+| Feature         | Sub-feature                 | Status | Notes                                          | Examples |
+| --------------- | --------------------------- | ------ | ---------------------------------------------- | -------- |
+| `config`        | `--local`                   | ✅     | Read and write per-repository (`.git/config`). |          |
+| `config`        | `--global` <br/> `--system` | ✅     | Read-only.                                     |          |
+| `gitignore`     |                             | ✅     |                                                |          |
+| `gitattributes` |                             | ✅     |                                                |          |
+| `git-worktree`  |                             | ❌     | Multiple worktrees are not supported.          |          |