git: get info from a 'bare' repo instead

For git repositories you basically always pay the storage cost twice:
once for the tree in .git, once for the actual files being checked out.
Additionally, the tree in .git is compressed, so in many cases it can be
smaller than the actual files being checked out.

This commit updates Hound to optionally process git files from the
actual git files instead of the checked out tree.

For me, this saves a significant amount of disk space. Why does it
matter? Because I run hound on a laptop instead of a datacenter, and
space is limited. It does cost a few more CPU cycles, but that's fine by
me.

go.mod

@@ -1,8 +1,32 @@
 module github.com/hound-search/hound
 
-go 1.16
+go 1.18
 
 require (
 	github.com/blang/semver/v4 v4.0.0
-	golang.org/x/mod v0.10.0
+	github.com/go-git/go-git/v5 v5.12.0
+	golang.org/x/mod v0.12.0
+)
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/ProtonMail/go-crypto v1.0.0 // indirect
+	github.com/cloudflare/circl v1.3.7 // indirect
+	github.com/cyphar/filepath-securejoin v0.2.4 // indirect
+	github.com/emirpasic/gods v1.18.1 // indirect
+	github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 // indirect
+	github.com/go-git/go-billy/v5 v5.5.0 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 // indirect
+	github.com/kevinburke/ssh_config v1.2.0 // indirect
+	github.com/pjbgf/sha1cd v0.3.0 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.2.2 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	golang.org/x/crypto v0.21.0 // indirect
+	golang.org/x/net v0.22.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
+	golang.org/x/tools v0.13.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
 )

go.sum

@@ -1,27 +1,132 @@
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 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
+golang.org/x/tools v0.6.0/go.mod h1:Xwgl3UAJ/d3gWutnCtw505GrjyAbvKui8lOU390QaIU=
+golang.org/x/tools v0.13.0 h1:Iey4qkscZuv0VvIt8E0neZjtPVQFSc870HQ448QgEmQ=
+golang.org/x/tools v0.13.0/go.mod h1:HvlwmtVNQAhOuCjW7xxvovg8wbNq7LwfXh/k7wXUl58=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

index/index.go

@@ -370,7 +370,7 @@ func indexAllFiles(opt *IndexOptions, dst string, fs vcs.FileSystem) error {
 	}
 	defer fileHandle.Close()
 
-	if err := fs.Walk(func(rel string, info os.FileInfo, err error) error { //nolint
+	if err := fs.Walk(func(rel string, info vcs.FileInfo, err error) error { //nolint
 		name := info.Name()
 
 		// Is this file considered "special", this means it's not even a part

vcs/dir_fs.go

@@ -32,7 +32,7 @@ func (dir *dirFilesystem) Open(name string) (io.ReadCloser, error) {
 	return os.Open(path.Join(dir.dir, name))
 }
 
-func (dir *dirFilesystem) Walk(fn filepath.WalkFunc) error {
+func (dir *dirFilesystem) Walk(fn FileSystemWalkFunc) error {
 	return filepath.Walk(dir.dir, func(path string, info fs.FileInfo, err error) error {
 		rel, err := filepath.Rel(dir.dir, path)
 		if err != nil {

vcs/git.go

@@ -24,6 +24,7 @@ func init() {
 type GitDriver struct {
 	DetectRef     bool   `json:"detect-ref"`
 	Ref           string `json:"ref"`
+	Bare          bool   `json:"bare"`
 	refDetetector refDetetector
 }
 
@@ -49,10 +50,15 @@ func newGit(b []byte) (Driver, error) {
 }
 
 func (g *GitDriver) HeadRev(dir string) (string, error) {
+	targetRef := "HEAD"
+	if g.Bare {
+		targetRef = fmt.Sprintf("origin/%s", g.targetRef(dir))
+	}
+
 	cmd := exec.Command(
 		"git",
 		"rev-parse",
-		"HEAD")
+		targetRef)
 	cmd.Dir = dir
 	r, err := cmd.StdoutPipe()
 	if err != nil {
@@ -102,12 +108,15 @@ func (g *GitDriver) Pull(dir string) (string, error) {
 		return "", err
 	}
 
-	if _, err := run("git reset", dir,
-		"git",
-		"reset",
-		"--hard",
-		fmt.Sprintf("origin/%s", targetRef)); err != nil {
-		return "", err
+	if !g.Bare {
+		// XXX(tvdw) Check if this works without fetch?
+		if _, err := run("git reset", dir,
+			"git",
+			"reset",
+			"--hard",
+			fmt.Sprintf("origin/%s", targetRef)); err != nil {
+			return "", err
+		}
 	}
 
 	return g.HeadRev(dir)
@@ -130,12 +139,16 @@ func (g *GitDriver) targetRef(dir string) string {
 
 func (g *GitDriver) Clone(dir, url string) (string, error) {
 	par, rep := filepath.Split(dir)
-	cmd := exec.Command(
-		"git",
+
+	cmdArgs := []string{
 		"clone",
 		"--depth", "1",
-		url,
-		rep)
+	}
+	if g.Bare {
+		cmdArgs = append(cmdArgs, "--bare")
+	}
+	cmdArgs = append(cmdArgs, url, rep)
+	cmd := exec.Command("git", cmdArgs...)
 	cmd.Dir = par
 	out, err := cmd.CombinedOutput()
 	if err != nil {
@@ -229,5 +242,9 @@ func (d *headBranchDetector) detectRef(dir string) string {
 }
 
 func (g *GitDriver) FileSystem(dir string) (FileSystem, error) {
-	return NewDirFilesystem(dir)
+	if g.Bare {
+		return NewGitFilesystem(dir, fmt.Sprintf("origin/%s", g.targetRef(dir)))
+	} else {
+		return NewDirFilesystem(dir)
+	}
 }

vcs/git_fs.go

@@ -0,0 +1,117 @@
+package vcs
+
+import (
+	"io"
+	"io/fs"
+	"path"
+	"slices"
+
+	gogit "github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/filemode"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type gitFilesystem struct {
+	repo *gogit.Repository
+	root *object.Tree
+}
+
+type gitFileinfo struct {
+	raw *object.File
+}
+
+type gitDirinfo struct {
+	name string
+}
+
+func NewGitFilesystem(dir, ref string) (FileSystem, error) {
+	repo, err := gogit.PlainOpen(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	rev, err := repo.ResolveRevision(plumbing.Revision(ref))
+	if err != nil {
+		return nil, err
+	}
+
+	commit, err := repo.CommitObject(*rev)
+	if err != nil {
+		return nil, err
+	}
+
+	root, err := commit.Tree()
+	if err != nil {
+		return nil, err
+	}
+
+	return &gitFilesystem{
+		repo: repo,
+		root: root,
+	}, nil
+}
+
+func (fs *gitFilesystem) Open(name string) (io.ReadCloser, error) {
+	file, err := fs.root.File(name)
+	if err != nil {
+		return nil, err
+	}
+	return file.Reader()
+}
+
+func (fs *gitFilesystem) Walk(fn FileSystemWalkFunc) error {
+	seenDirs := make(map[string]interface{})
+
+	return fs.root.Files().ForEach(func(f *object.File) error {
+		n := f.Name
+		var createDirs []string
+		for n != "" {
+			n = path.Dir(n)
+			if _, ok := seenDirs[n]; ok {
+				break
+			}
+			seenDirs[n] = true
+			createDirs = append(createDirs, n)
+		}
+		if len(createDirs) > 0 {
+			slices.Reverse(createDirs)
+			for _, createDir := range createDirs {
+				err := fn(createDir, &gitDirinfo{createDir}, nil)
+				if err != nil {
+					return err
+				}
+			}
+		}
+
+		fi := &gitFileinfo{f}
+		if fi.IsDir() {
+			seenDirs[f.Name] = true
+		}
+
+		return fn(f.Name, fi, nil)
+	})
+}
+
+func (fi *gitFileinfo) Name() string {
+	return path.Base(fi.raw.Name)
+}
+
+func (fi *gitFileinfo) IsDir() bool {
+	return fi.raw.Mode == filemode.Dir
+}
+
+func (fi *gitFileinfo) Mode() fs.FileMode {
+	mode, _ := fi.raw.Mode.ToOSFileMode()
+	return mode
+}
+
+func (di *gitDirinfo) Name() string {
+	return path.Base(di.name)
+}
+func (di *gitDirinfo) IsDir() bool {
+	return true
+}
+func (di *gitDirinfo) Mode() fs.FileMode {
+	return fs.FileMode(0o755)
+}