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gitcli

package
v0.2.0 Latest Latest
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 Go to latest Published: Oct 10, 2026 License: AGPL-3.0 Imports: 25 Imported by: 0

Documentation

Overview

Package gitcli implements the Git ports over the git binary. Every invocation runs in an isolated environment that is built here and never inherits the caller's.

Index

Constants

This section is empty.

Variables

View Source 
var ErrClosed = errors.New("gitcli: reader is closed")

ErrClosed is returned by reads after Close.

View Source 
var MinVersion = Version{Major: 2, Minor: 45}

MinVersion is the oldest supported git.

Functions

func HooksDir 

func HooksDir(dataDir string) string

HooksDir is the directory, below the data root, that holds the hook scripts every receive-pack runs.

Types

type Config 

type Config struct {
	// Bin is the git executable: a name looked up in the process PATH, or a path.
	// It is required; the default belongs to the configuration.
	Bin string
	// DataDir is the data root (absolute). repos/, repos/.staging/ and
	// trash/ below it must exist; run/git-home/ is the HOME of git.
	DataDir string
	// Path is the PATH given to git, which it uses to find its helpers.
	Path string
	// MaxReceiveBytes is the largest pack a push may send
	// (receive.maxInputSize); zero leaves Git unlimited.
	MaxReceiveBytes int64
	// CatFileIdle is how long a repository's long-lived `git cat-file`
	// process may stay unused before it is stopped. Zero means 60 seconds.
	CatFileIdle time.Duration
	// MaxCatFiles bounds the long-lived cat-file processes. Zero means 16.
	MaxCatFiles int
	// MaxExec bounds the one-shot git processes that run at once (every
	// command but the long-lived cat-file processes and the blob streams);
	// callers beyond it wait for a slot until their context ends. Zero means
	// max(4, 2*GOMAXPROCS).
	MaxExec int
	// MaxBlobStreams bounds the open blob streams, each of which holds a git
	// process until its reader is closed. Streams beyond it are refused with
	// domain.ErrResourceExhausted rather than queued: a slow reader could hold
	// a slot for long. Zero means 32.
	MaxBlobStreams int
}

Config configures a Git adapter. The adapter never reads the process environment: the caller passes what it needs.

type Git 

type Git struct {
	// contains filtered or unexported fields
}

Git is the git CLI adapter for ports.GitRepos.

func New 

func New(cfg Config) *Git

New builds an adapter. It does not run git: call CheckVersion.

func (*Git) BranchHead added in v0.2.0 

func (g *Git) BranchHead(ctx context.Context, repo domain.RepoName, branch string) (domain.ObjectID, error)

BranchHead resolves refs/heads/<branch>^{commit} with `cat-file`.

func (*Git) CheckVersion 

func (g *Git) CheckVersion(ctx context.Context) (Version, error)

CheckVersion runs `git version` and fails if git is missing, unreadable or older than MinVersion. It returns the version found.

func (*Git) Close 

func (g *Git) Close(ctx context.Context) error

Close stops the long-lived git processes of the read side and waits for them, until ctx ends. Reads after Close fail with ErrClosed. Close is idempotent; the adapter's write side keeps working.

func (*Git) CommitTree added in v0.2.0 

func (g *Git) CommitTree(ctx context.Context, repo domain.RepoName, id domain.ObjectID) (domain.ObjectID, error)

CommitTree runs `git rev-parse <commit>^{tree}`.

func (*Git) DefaultBranch 

func (g *Git) DefaultBranch(ctx context.Context, name domain.RepoName) (string, bool, error)

DefaultBranch reads HEAD and checks the branch with `git for-each-ref`.

func (*Git) DiffCommits added in v0.2.0 

func (g *Git) DiffCommits(ctx context.Context, repo domain.RepoName, base, head domain.ObjectID, limits domain.DiffLimits) (domain.DiffStats, domain.Diff, error)

DiffCommits reads the diff between two commits like GetCommit does.

func (*Git) Discard 

func (g *Git) Discard(_ context.Context, id ports.StagedID) error

Discard removes a staged repository.

func (*Git) GetCommit 

func (g *Git) GetCommit(ctx context.Context, repo domain.RepoName, rev domain.Revision, limits domain.DiffLimits) (domain.CommitDetail, error)

GetCommit returns a commit with its diff against its first parent (the empty tree for a root commit), read in one pass of 

git diff-tree -r -M -z --raw --numstat -p <parent> <commit>

which prints the changed files, then their line counts, then the patch. Statistics come from the line counts, binary files from their "-" counts. The patch is parsed as it streams: nothing beyond the limits is kept, and git is stopped once nothing more is needed.

func (*Git) GetTree 

func (g *Git) GetTree(ctx context.Context, repo domain.RepoName, rev domain.Revision, path domain.TreePath, includeLast bool) (domain.Tree, error)

GetTree lists a directory with `git ls-tree -z -l`.

func (*Git) HTTPBackend 

func (g *Git) HTTPBackend(ctx context.Context, push bool) (ports.HTTPBackend, error)

HTTPBackend resolves git-http-backend through `git --exec-path` of the configured git (once), and builds its environment: the isolated one, GIT_PROJECT_ROOT=<data>/repos, GIT_HTTP_EXPORT_ALL and the configuration passed by GIT_CONFIG_COUNT/KEY/VALUE, so that nothing is written to the repositories: 

core.hooksPath=<data>/run/hooks
receive.fsckObjects=true
uploadpack.allowFilter=true
http.receivepack=true            (push only)
receive.maxInputSize=<max>       (push only, when configured)

A push also gets REMOTE_USER=owner.

func (*Git) HasBranch 

func (g *Git) HasBranch(ctx context.Context, name domain.RepoName, branch string) (bool, error)

HasBranch checks refs/heads/<branch> with `git for-each-ref` after `git check-ref-format`, which rejects the glob characters for-each-ref would otherwise interpret.

func (*Git) HasCommit added in v0.2.0 

func (g *Git) HasCommit(ctx context.Context, repo domain.RepoName, id domain.ObjectID) (bool, error)

HasCommit asks `cat-file` for the type of the object.

func (*Git) HeadBranch 

func (g *Git) HeadBranch(_ context.Context, name domain.RepoName) (string, error)

HeadBranch reads the HEAD file of the bare repository (files ref backend). It is empty when HEAD is detached.

func (*Git) IsAncestor added in v0.2.0 

func (g *Git) IsAncestor(ctx context.Context, repo domain.RepoName, ancestor, descendant domain.ObjectID) (bool, error)

IsAncestor runs `git merge-base --is-ancestor`, which exits 1 for "no".

func (*Git) List 

func (g *Git) List(_ context.Context) (ports.RepoDirs, error)

List returns the repository directories. Entries that are not "<valid name>.git" directories are reported as invalid; .staging is not an entry.

func (*Git) ListCommits 

func (g *Git) ListCommits(ctx context.Context, repo domain.RepoName, q ports.CommitQuery) (ports.CommitPage, error)

ListCommits pages through `git log`, which stops after Skip+Limit+1 commits.

func (*Git) ListRange added in v0.2.0 

func (g *Git) ListRange(ctx context.Context, repo domain.RepoName, exclude, head domain.ObjectID, limit int) ([]domain.Commit, bool, error)

ListRange runs `git log <head> ^<exclude>`.

func (*Git) ListRefs 

func (g *Git) ListRefs(ctx context.Context, repo domain.RepoName) ([]domain.Ref, error)

ListRefs lists HEAD, the branches and the tags with `git for-each-ref`. An annotated tag is followed to its commit; a tag of a tag is followed with one `cat-file` request each.

func (*Git) Maintain 

func (g *Git) Maintain(ctx context.Context, name domain.RepoName) error

Maintain runs `git commit-graph write --reachable --changed-paths --split`.

func (*Git) MergeBase added in v0.2.0 

func (g *Git) MergeBase(ctx context.Context, repo domain.RepoName, a, b domain.ObjectID) (domain.ObjectID, error)

MergeBase runs `git merge-base`, which exits 1 when there is none.

func (*Git) OpenBlob 

func (g *Git) OpenBlob(ctx context.Context, repo domain.RepoName, rev domain.Revision, p domain.TreePath) (domain.BlobInfo, io.ReadCloser, error)

OpenBlob describes the file at path and returns its content as a stream.

A blob up to 256 KiB is read through the repository's long-lived cat-file process. A larger one gets a `git cat-file blob` process that lives until the reader is closed, or ctx ends, or the adapter is closed; the memory used is a few buffers, whatever the size. The reader fails with io.ErrUnexpectedEOF if git stops before the announced size.

func (*Git) Publish 

func (g *Git) Publish(ctx context.Context, id ports.StagedID, name domain.RepoName) error

Publish renames the staged repository to repos/<name>.git without replacing anything.

func (*Git) PurgeStaging 

func (g *Git) PurgeStaging(ctx context.Context) error

PurgeStaging removes everything under repos/.staging/.

func (*Git) ResolveRefPath 

func (g *Git) ResolveRefPath(ctx context.Context, repo domain.RepoName, path string) (domain.RefPath, error)

ResolveRefPath tries the leading segments of path as a revision (branch, tag, full ref name, HEAD; a single segment may also be a commit id), longest first, with up to one `cat-file` request per candidate on the repository's process. At most 32 segments are tried.

func (*Git) ResolveRevision 

func (g *Git) ResolveRevision(ctx context.Context, repo domain.RepoName, rev domain.Revision) (domain.ResolvedRevision, error)

ResolveRevision resolves a revision with `cat-file`.

func (*Git) SetDefaultBranch 

func (g *Git) SetDefaultBranch(ctx context.Context, name domain.RepoName, branch string) error

SetDefaultBranch runs `git symbolic-ref HEAD refs/heads/<branch>`.

func (*Git) Stage 

func (g *Git) Stage(ctx context.Context) (ports.StagedID, error)

Stage runs `git init --bare` in a new directory under repos/.staging/ and sets the repository defaults. The initial branch is main.

func (*Git) Trash 

func (g *Git) Trash(ctx context.Context, name domain.RepoName) error

Trash moves repos/<name>.git to trash/<name>-<unix>.git.

func (*Git) UpdateBranch added in v0.2.0 

func (g *Git) UpdateBranch(ctx context.Context, repo domain.RepoName, branch string, old, newID domain.ObjectID) error

UpdateBranch runs `git update-ref refs/heads/<branch> <new> <old>`, which takes the ref lock and refuses when the ref is not at old. A failure is told from a moved branch by reading the branch again.

func (*Git) WriteCommit added in v0.2.0 

func (g *Git) WriteCommit(ctx context.Context, repo domain.RepoName, object []byte) (domain.ObjectID, error)

WriteCommit runs `git hash-object -t commit -w --stdin`, which also checks that the object is a well-formed commit.

type Version 

type Version struct{ Major, Minor, Patch int }

Version is a git release number.

func ParseVersion 

func ParseVersion(out string) (Version, error)

ParseVersion parses the output of `git version`, such as "git version 2.45.0", "git version 2.39.5 (Apple Git-154)" or "git version 2.46.0.rc1".

func (Version) Less 

func (v Version) Less(o Version) bool

Less reports whether v is older than o.

func (Version) String 

func (v Version) String() string

String returns "major.minor.patch".

Source Files

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