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*: Improve docs on examples, compatibility and extensibility
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pjbgf committed Jul 24, 2023
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Supported Capabilities
======================

Here is a non-comprehensive table of git commands and features whose equivalent
is supported by go-git.

| Feature | Status | Notes |
|---------------------------------------|--------|-------|
| **config** |
| config | ✔ | Reading and modifying per-repository configuration (`.git/config`) is supported. Global configuration (`$HOME/.gitconfig`) is not. |
| **getting and creating repositories** |
| init | ✔ | Plain init and `--bare` are supported. Flags `--template`, `--separate-git-dir` and `--shared` are not. |
| clone | ✔ | Plain clone and equivalents to `--progress`, `--single-branch`, `--depth`, `--origin`, `--recurse-submodules` are supported. Others are not. |
| **basic snapshotting** |
| add | ✔ | Plain add is supported. Any other flags aren't supported |
| status | ✔ |
| commit | ✔ |
| reset | ✔ |
| rm | ✔ |
| mv | ✔ |
| **branching and merging** |
| branch | ✔ |
| checkout | ✔ | Basic usages of checkout are supported. |
| merge | ✖ |
| mergetool | ✖ |
| stash | ✖ |
| tag | ✔ |
| **sharing and updating projects** |
| fetch | ✔ |
| pull | ✔ | Only supports merges where the merge can be resolved as a fast-forward. |
| push | ✔ |
| remote | ✔ |
| submodule | ✔ |
| **inspection and comparison** |
| show | ✔ |
| log | ✔ |
| shortlog | (see log) |
| describe | |
| **patching** |
| apply | ✖ |
| cherry-pick | ✖ |
| diff | ✔ | Patch object with UnifiedDiff output representation |
| rebase | ✖ |
| revert | ✖ |
| **debugging** |
| bisect | ✖ |
| blame | ✔ |
| grep | ✔ |
| **email** ||
| am | ✖ |
| apply | ✖ |
| format-patch | ✖ |
| send-email | ✖ |
| request-pull | ✖ |
| **external systems** |
| svn | ✖ |
| fast-import | ✖ |
| **administration** |
| clean | ✔ |
| gc | ✖ |
| fsck | ✖ |
| reflog | ✖ |
| filter-branch | ✖ |
| instaweb | ✖ |
| archive | ✖ |
| bundle | ✖ |
| prune | ✖ |
| repack | ✖ |
| **server admin** |
| daemon | |
| update-server-info | |
| **advanced** |
| notes | ✖ |
| replace | ✖ |
| worktree | ✖ |
| annotate | (see blame) |
| **gpg** |
| git-verify-commit | ✔ |
| git-verify-tag | ✔ |
| **plumbing commands** |
| cat-file | ✔ |
| check-ignore | |
| commit-tree | |
| count-objects | |
| diff-index | |
| for-each-ref | ✔ |
| hash-object | ✔ |
| ls-files | ✔ |
| merge-base | ✔ | Calculates the merge-base only between two commits, and supports `--independent` and `--is-ancestor` modifiers; Does not support `--fork-point` nor `--octopus` modifiers. |
| read-tree | |
| rev-list | ✔ |
| rev-parse | |
| show-ref | ✔ |
| symbolic-ref | ✔ |
| update-index | |
| update-ref | |
| verify-pack | |
| write-tree | |
| **protocols** |
| http(s):// (dumb) | ✖ |
| http(s):// (smart) | ✔ |
| git:// | ✔ |
| ssh:// | ✔ |
| file:// | partial | Warning: this is not pure Golang. This shells out to the `git` binary. |
| custom | ✔ |
| **other features** |
| gitignore | ✔ |
| gitattributes | ✖ |
| index version | |
| packfile version | |
| push-certs | ✖ |
# Supported Features

Here is a non-comprehensive table of git commands and features and their
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) |

## 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` | | ✅ | | |

## 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) |

## 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 | ❌ | | |

## Inspection and comparison

| 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` | | ❌ | | |

## Debugging

| 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` | | ❌ | | |

## External systems

| 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` | | ❌ | | |

## Server admin

| Feature | Sub-feature | Status | Notes | Examples |
|---|---|---|---|---|
| `daemon` | | ❌ | | |
| `update-server-info` | | ❌ | | |

## Advanced

| 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` | | ✅ | | |

## 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` | | ❌ | | |

## 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 | | ❌ | |

## 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>` | ❌ | |

## 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) |

## 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` | | ❌ | | |

## 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. | |

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