mugit @ 7a05bd07557cf1d2e05e5d47ff0b5c9efcc18d01

M go.mod

@@ -2,4 +2,30 @@ module olexsmir.xyz/mugit
 
 go 1.25.3
 
-require gopkg.in/yaml.v2 v2.4.0
+require (
+	github.com/bluekeyes/go-gitdiff v0.8.1
+	github.com/go-git/go-git/v5 v5.16.4
+	gopkg.in/yaml.v2 v2.4.0
+)
+
+require (
+	dario.cat/mergo v1.0.0 // indirect
+	github.com/Microsoft/go-winio v0.6.2 // indirect
+	github.com/ProtonMail/go-crypto v1.1.6 // indirect
+	github.com/cloudflare/circl v1.6.1 // indirect
+	github.com/cyphar/filepath-securejoin v0.4.1 // 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 v5.6.2 // indirect
+	github.com/golang/groupcache v0.0.0-20241129210726-2c02b8208cf8 // 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 v0.3.2 // indirect
+	github.com/sergi/go-diff v1.3.2-0.20230802210424-5b0b94c5c0d3 // indirect
+	github.com/skeema/knownhosts v1.3.1 // indirect
+	github.com/xanzy/ssh-agent v0.3.3 // indirect
+	golang.org/x/crypto v0.37.0 // indirect
+	golang.org/x/net v0.39.0 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	gopkg.in/warnings.v0 v0.1.2 // indirect
+)

M go.sum

@@ -1,4 +1,105 @@
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+dario.cat/mergo v1.0.0 h1:AGCNq9Evsj31mOgNPcLyXc+4PNABt905YmuqPYYpBWk=
+dario.cat/mergo v1.0.0/go.mod h1:uNxQE+84aUszobStD9th8a29P2fMDhsBdgRYvZOxGmk=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
+github.com/Microsoft/go-winio v0.6.2 h1:F2VQgta7ecxGYO8k3ZZz3RS8fVIXVxONVUPlNERoyfY=
+github.com/Microsoft/go-winio v0.6.2/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
+github.com/ProtonMail/go-crypto v1.1.6 h1:ZcV+Ropw6Qn0AX9brlQLAUXfqLBc7Bl+f/DmNxpLfdw=
+github.com/ProtonMail/go-crypto v1.1.6/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/bluekeyes/go-gitdiff v0.8.1 h1:lL1GofKMywO17c0lgQmJYcKek5+s8X6tXVNOLxy4smI=
+github.com/bluekeyes/go-gitdiff v0.8.1/go.mod h1:WWAk1Mc6EgWarCrPFO+xeYlujPu98VuLW3Tu+B/85AE=
+github.com/cloudflare/circl v1.6.1 h1:zqIqSPIndyBh1bjLVVDHMPpVKqp8Su/V+6MeDzzQBQ0=
+github.com/cloudflare/circl v1.6.1/go.mod h1:uddAzsPgqdMAYatqJ0lsjX1oECcQLIlRpzZh3pJrofs=
+github.com/cyphar/filepath-securejoin v0.4.1 h1:JyxxyPEaktOD+GAnqIqTf9A8tHyAG22rowi7HkoSU1s=
+github.com/cyphar/filepath-securejoin v0.4.1/go.mod h1:Sdj7gXlvMcPZsbhwhQ33GguGLDGQL7h7bg04C/+u9jI=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/elazarl/goproxy v1.7.2 h1:Y2o6urb7Eule09PjlhQRGNsqRfPmYI3KKQLFpCAV3+o=
+github.com/elazarl/goproxy v1.7.2/go.mod h1:82vkLNir0ALaW14Rc399OTTjyNREgmdL2cVoIbS6XaE=
+github.com/emirpasic/gods v1.18.1 h1:FXtiHYKDGKCW2KzwZKx0iC0PQmdlorYgdFG9jPXJ1Bc=
+github.com/emirpasic/gods v1.18.1/go.mod h1:8tpGGwCnJ5H4r6BWwaV6OrWmMoPhUl5jm/FMNAnJvWQ=
+github.com/gliderlabs/ssh v0.3.8 h1:a4YXD1V7xMF9g5nTkdfnja3Sxy1PVDCj1Zg4Wb8vY6c=
+github.com/gliderlabs/ssh v0.3.8/go.mod h1:xYoytBv1sV0aL3CavoDuJIQNURXkkfPA/wxQ1pL1fAU=
+github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376 h1:+zs/tPmkDkHx3U66DAb0lQFJrpS6731Oaa12ikc+DiI=
+github.com/go-git/gcfg v1.5.1-0.20230307220236-3a3c6141e376/go.mod h1:an3vInlBmSxCcxctByoQdvwPiA7DTK7jaaFDBTtu0ic=
+github.com/go-git/go-billy/v5 v5.6.2 h1:6Q86EsPXMa7c3YZ3aLAQsMA0VlWmy43r6FHqa/UNbRM=
+github.com/go-git/go-billy/v5 v5.6.2/go.mod h1:rcFC2rAsp/erv7CMz9GczHcuD0D32fWzH+MJAU+jaUU=
+github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399 h1:eMje31YglSBqCdIqdhKBW8lokaMrL3uTkpGYlE2OOT4=
+github.com/go-git/go-git-fixtures/v4 v4.3.2-0.20231010084843-55a94097c399/go.mod h1:1OCfN199q1Jm3HZlxleg+Dw/mwps2Wbk9frAWm+4FII=
+github.com/go-git/go-git/v5 v5.16.4 h1:7ajIEZHZJULcyJebDLo99bGgS0jRrOxzZG4uCk2Yb2Y=
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+github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
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+github.com/onsi/gomega v1.34.1 h1:EUMJIKUjM8sKjYbtxQI9A4z2o+rruxnzNvpknOXie6k=
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+golang.org/x/crypto v0.37.0 h1:kJNSjF/Xp7kU0iB2Z+9viTPMW4EqqsrywMXLJOOsXSE=
+golang.org/x/crypto v0.37.0/go.mod h1:vg+k43peMZ0pUMhYmVAWysMK35e6ioLh3wB8ZCAfbVc=
+golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 h1:2dVuKD2vS7b0QIHQbpyTISPd0LeHDbnYEryqj5Q1ug8=
+golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56/go.mod h1:M4RDyNAINzryxdtnbRXRL/OHtkFuWGRjvuhBJpk2IlY=
+golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.39.0 h1:ZCu7HMWDxpXpaiKdhzIfaltL9Lp31x/3fCP11bc6/fY=
+golang.org/x/net v0.39.0/go.mod h1:X7NRbYVEA+ewNkCNyJ513WmMdQ3BineSwVtN2zD/d+E=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.32.0 h1:s77OFDvIQeibCmezSnk/q6iAfkdiQaJi4VzroCFrN20=
+golang.org/x/sys v0.32.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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+golang.org/x/text v0.24.0/go.mod h1:L8rBsPeo2pSS+xqN0d5u2ikmjtmoJbDBT1b7nHvFCdU=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 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/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
+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 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 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=

A internal/git/diff.go

@@ -0,0 +1,127 @@
+package git
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/bluekeyes/go-gitdiff/gitdiff"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type TextFragment struct {
+	Header string
+	Lines  []gitdiff.Line
+}
+
+type Diff struct {
+	Name struct {
+		Old string
+		New string
+	}
+	TextFragments []TextFragment
+	IsBinary      bool
+	IsNew         bool
+	IsDelete      bool
+}
+
+type NiceDiff struct {
+	Diff   []Diff
+	Commit struct {
+		Message string
+		Author  object.Signature
+		This    string
+		Parent  string
+	}
+	Stat struct {
+		FilesChanged int
+		Insertions   int
+		Deletions    int
+	}
+}
+
+func (g *Repo) Diff() (*NiceDiff, error) {
+	c, err := g.r.CommitObject(g.h)
+	if err != nil {
+		return nil, fmt.Errorf("commit object: %w", err)
+	}
+
+	patch, parent, err := g.getPatch(c)
+	if err != nil {
+		return nil, err
+	}
+
+	diffs, _, err := gitdiff.Parse(strings.NewReader(patch.String()))
+	if err != nil {
+		return nil, fmt.Errorf("parsing diff: %w", err)
+	}
+
+	nd := NiceDiff{}
+	nd.Commit.Message = c.Message
+	nd.Commit.Author = c.Author
+	nd.Commit.This = c.Hash.String()
+	nd.Commit.Parent = getParentHash(parent)
+	nd.Stat.FilesChanged = len(diffs)
+
+	nd.Diff = make([]Diff, len(diffs))
+	for i, d := range diffs {
+		diff := &nd.Diff[i]
+		diff.Name.New = d.NewName
+		diff.Name.Old = d.OldName
+		diff.IsBinary = d.IsBinary
+		diff.IsNew = d.IsNew
+		diff.IsDelete = d.IsDelete
+
+		for _, tf := range d.TextFragments {
+			diff.TextFragments = append(diff.TextFragments, TextFragment{
+				Header: tf.Header(),
+				Lines:  tf.Lines,
+			})
+			for _, l := range tf.Lines {
+				switch l.Op {
+				case gitdiff.OpAdd:
+					nd.Stat.Insertions += 1
+				case gitdiff.OpDelete:
+					nd.Stat.Deletions += 1
+				}
+			}
+		}
+	}
+	return &nd, nil
+}
+
+func (g *Repo) getPatch(c *object.Commit) (*object.Patch, *object.Commit, error) {
+	commitTree, err := c.Tree()
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var parentTree *object.Tree
+	var parent *object.Commit
+
+	if c.NumParents() != 0 {
+		parent, err = c.Parents().Next()
+		if err != nil {
+			return nil, nil, err
+		}
+		parentTree, err = parent.Tree()
+		if err != nil {
+			return nil, nil, err
+		}
+	} else {
+		parentTree = &object.Tree{}
+	}
+
+	patch, err := parentTree.Patch(commitTree)
+	if err != nil {
+		return nil, nil, fmt.Errorf("patch: %w", err)
+	}
+
+	return patch, parent, nil
+}
+
+func getParentHash(parent *object.Commit) string {
+	if parent == nil || parent.Hash.IsZero() {
+		return ""
+	}
+	return parent.Hash.String()
+}

D

@@ -1,4 +0,0 @@
-package git
-
-
-

A internal/git/gitservice/gitservice.go

@@ -0,0 +1,105 @@
+package gitservice
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os/exec"
+	"strings"
+	"syscall"
+)
+
+// Thanks https://git.icyphox.sh/legit/blob/master/git/service/service.go
+
+// InfoRefs executes git-upload-pack --advertise-refs for smart-HTTP discovery.
+func InfoRefs(dir string, out io.Writer) error {
+	cmd := exec.Command("git",
+		"upload-pack",
+		"--stateless-rpc",
+		"--advertise-refs",
+		".")
+	cmd.Dir = dir
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+	stdoutPipe, _ := cmd.StdoutPipe()
+	cmd.Stderr = cmd.Stdout
+	defer stdoutPipe.Close()
+
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("start git-upload-pack: %w", err)
+	}
+
+	if err := packLine(out, "# service=git-upload-pack\n"); err != nil {
+		return fmt.Errorf("write pack line: %w", err)
+	}
+
+	if err := packFlush(out); err != nil {
+		return fmt.Errorf("flush pack: %w", err)
+	}
+
+	var buf bytes.Buffer
+	if _, err := io.Copy(&buf, stdoutPipe); err != nil {
+		return fmt.Errorf("copy stdout to buffer: %w", err)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		var out strings.Builder
+		io.Copy(&out, &buf)
+		return fmt.Errorf("git-upload-pack: %w: %s", err, out.String())
+	}
+
+	if _, err := io.Copy(out, &buf); err != nil {
+		return fmt.Errorf("copy buffer to output: %w", err)
+	}
+
+	return nil
+}
+
+// UploadPack executes git-upload-pack for smart-HTTP git fetch/clone.
+func UploadPack(dir string, in io.Reader, out io.Writer) error {
+	cmd := exec.Command("git",
+		"-c", "uploadpack.allowFilter=true",
+		"upload-pack",
+		"--stateless-rpc",
+		".")
+	cmd.Dir = dir
+	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
+
+	stdoutPipe, _ := cmd.StdoutPipe()
+	cmd.Stderr = cmd.Stdout
+	defer stdoutPipe.Close()
+
+	stdinPipe, err := cmd.StdinPipe()
+	if err != nil {
+		return fmt.Errorf("stdin pipe: %w", err)
+	}
+	defer stdinPipe.Close()
+
+	if err := cmd.Start(); err != nil {
+		return fmt.Errorf("start git-upload-pack: %w", err)
+	}
+
+	if _, err := io.Copy(stdinPipe, in); err != nil {
+		return fmt.Errorf("copy to stdin: %w", err)
+	}
+	stdinPipe.Close()
+
+	if _, err := io.Copy(out, stdoutPipe); err != nil {
+		return fmt.Errorf("copy stdout: %w", err)
+	}
+
+	if err := cmd.Wait(); err != nil {
+		return fmt.Errorf("git-upload-pack: %w", err)
+	}
+
+	return nil
+}
+
+func packLine(w io.Writer, s string) error {
+	_, err := fmt.Fprintf(w, "%04x%s", len(s)+4, s)
+	return err
+}
+
+func packFlush(w io.Writer) error {
+	_, err := fmt.Fprint(w, "0000")
+	return err
+}

A internal/git/repo.go

@@ -0,0 +1,171 @@
+package git
+
+import (
+	"fmt"
+	"sort"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+// Thanks https://git.icyphox.sh/legit/blob/master/git/git.go
+
+type Repo struct {
+	path string
+	r    *git.Repository
+	h    plumbing.Hash
+}
+
+// Open opens a git repository at path. If ref is empty, HEAD is used.
+func Open(path string, ref string) (*Repo, error) {
+	var err error
+	g := Repo{}
+	g.path = path
+	g.r, err = git.PlainOpen(path)
+	if err != nil {
+		return nil, fmt.Errorf("opening %s: %w", path, err)
+	}
+
+	if ref == "" {
+		head, err := g.r.Head()
+		if err != nil {
+			return nil, fmt.Errorf("getting head of %s: %w", path, err)
+		}
+		g.h = head.Hash()
+	} else {
+		hash, err := g.r.ResolveRevision(plumbing.Revision(ref))
+		if err != nil {
+			return nil, fmt.Errorf("resolving rev %s for %s: %w", ref, path, err)
+		}
+		g.h = *hash
+	}
+	return &g, nil
+}
+
+func (g *Repo) Commits() ([]*object.Commit, error) {
+	ci, err := g.r.Log(&git.LogOptions{From: g.h})
+	if err != nil {
+		return nil, fmt.Errorf("commits from ref: %w", err)
+	}
+
+	commits := []*object.Commit{}
+	ci.ForEach(func(c *object.Commit) error {
+		commits = append(commits, c)
+		return nil
+	})
+
+	return commits, nil
+}
+
+func (g *Repo) LastCommit() (*object.Commit, error) {
+	c, err := g.r.CommitObject(g.h)
+	if err != nil {
+		return nil, fmt.Errorf("last commit: %w", err)
+	}
+	return c, nil
+}
+
+func (g *Repo) FileContent(path string) (string, error) {
+	c, err := g.r.CommitObject(g.h)
+	if err != nil {
+		return "", fmt.Errorf("commit object: %w", err)
+	}
+
+	tree, err := c.Tree()
+	if err != nil {
+		return "", fmt.Errorf("file tree: %w", err)
+	}
+
+	file, err := tree.File(path)
+	if err != nil {
+		return "", err
+	}
+
+	isbin, _ := file.IsBinary()
+	if !isbin {
+		return file.Contents()
+	} else {
+		return "Not displaying binary file", nil
+	}
+}
+
+func (g *Repo) Tags() ([]*TagReference, error) {
+	iter, err := g.r.Tags()
+	if err != nil {
+		return nil, fmt.Errorf("tag objects: %w", err)
+	}
+
+	tags := make([]*TagReference, 0)
+	if err := iter.ForEach(func(ref *plumbing.Reference) error {
+		obj, err := g.r.TagObject(ref.Hash())
+		switch err {
+		case nil:
+			tags = append(tags, &TagReference{
+				ref: ref,
+				tag: obj,
+			})
+		case plumbing.ErrObjectNotFound:
+			tags = append(tags, &TagReference{
+				ref: ref,
+			})
+		default:
+			return err
+		}
+		return nil
+	}); err != nil {
+		return nil, err
+	}
+
+	tagList := &TagList{r: g.r, refs: tags}
+	sort.Sort(tagList)
+	return tags, nil
+}
+
+func (g *Repo) Branches() ([]*plumbing.Reference, error) {
+	bi, err := g.r.Branches()
+	if err != nil {
+		return nil, fmt.Errorf("branch: %w", err)
+	}
+
+	branches := []*plumbing.Reference{}
+	err = bi.ForEach(func(ref *plumbing.Reference) error {
+		branches = append(branches, ref)
+		return nil
+	})
+	return branches, err
+}
+
+func (g *Repo) Description() (string, error) {
+	c, err := g.r.Config()
+	if err != nil {
+		return "", fmt.Errorf("failed to read config: %w", err)
+	}
+
+	s := c.Raw.Section("mugit")
+	return s.Options.Get("description"), nil
+}
+
+func (g *Repo) IsPrivate() (bool, error) {
+	c, err := g.r.Config()
+	if err != nil {
+		return false, fmt.Errorf("failed to read config: %w", err)
+	}
+
+	s := c.Raw.Section("mugit")
+	return s.Options.Get("private") == "true", nil
+}
+
+func (g *Repo) IsGoMod() bool {
+	_, err := g.FileContent("go.mod")
+	return err == nil
+}
+
+func (g *Repo) FindMasterBranch(masters []string) (string, error) {
+	for _, b := range masters {
+		if _, err := g.r.ResolveRevision(plumbing.Revision(b)); err == nil {
+			return b, nil
+		}
+	}
+	return "", fmt.Errorf("unable to find master branch")
+}

A internal/git/tags.go

@@ -0,0 +1,57 @@
+package git
+
+import (
+	"time"
+
+	"github.com/go-git/go-git/v5"
+	"github.com/go-git/go-git/v5/plumbing"
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type TagList struct {
+	refs []*TagReference
+	r    *git.Repository
+}
+
+// TagReference represents both lightweight and annotated tags.
+// Lightweight tags contain only a reference.
+// Annotated tags contain both a reference and tag metadata.
+type TagReference struct {
+	ref *plumbing.Reference
+	tag *object.Tag
+}
+
+func (t *TagReference) Name() string {
+	return t.ref.Name().Short()
+}
+
+func (t *TagReference) Message() string {
+	if t.tag != nil {
+		return t.tag.Message
+	}
+	return ""
+}
+
+func (t *TagList) Len() int {
+	return len(t.refs)
+}
+
+func (t *TagList) Swap(i, j int) {
+	t.refs[i], t.refs[j] = t.refs[j], t.refs[i]
+}
+
+// Less sorting tags in reverse chronological order
+func (t *TagList) Less(i, j int) bool {
+	return t.getDate(i).After(t.getDate(j))
+}
+
+func (t *TagList) getDate(i int) time.Time {
+	if t.refs[i].tag != nil {
+		return t.refs[i].tag.Tagger.When
+	}
+	c, err := t.r.CommitObject(t.refs[i].ref.Hash())
+	if err != nil {
+		return time.Now()
+	}
+	return c.Committer.When
+}

A internal/git/tree.go

@@ -0,0 +1,62 @@
+package git
+
+import (
+	"fmt"
+
+	"github.com/go-git/go-git/v5/plumbing/object"
+)
+
+type NiceTree struct {
+	Name      string
+	Mode      string
+	Size      int64
+	IsFile    bool
+	IsSubtree bool
+}
+
+func makeNiceTree(t *object.Tree) []NiceTree {
+	nts := []NiceTree{}
+	for _, e := range t.Entries {
+		mode, _ := e.Mode.ToOSFileMode()
+		sz, _ := t.Size(e.Name)
+		nts = append(nts, NiceTree{
+			Name:   e.Name,
+			Mode:   mode.String(),
+			IsFile: e.Mode.IsFile(),
+			Size:   sz,
+		})
+	}
+	return nts
+}
+
+func (g *Repo) FileTree(path string) ([]NiceTree, error) {
+	c, err := g.r.CommitObject(g.h)
+	if err != nil {
+		return nil, fmt.Errorf("commit object: %w", err)
+	}
+
+	files := []NiceTree{}
+	tree, err := c.Tree()
+	if err != nil {
+		return nil, fmt.Errorf("file tree: %w", err)
+	}
+
+	if path == "" {
+		files = makeNiceTree(tree)
+	} else {
+		o, err := tree.FindEntry(path)
+		if err != nil {
+			return nil, err
+		}
+
+		if !o.Mode.IsFile() {
+			subtree, err := tree.Tree(path)
+			if err != nil {
+				return nil, err
+			}
+			files = makeNiceTree(subtree)
+		}
+	}
+
+	return files, nil
+}

M internal/handlers/git.go

@@ -1,1 +1,77 @@
 package handlers
+
+import (
+	"compress/gzip"
+	"io"
+	"log/slog"
+	"net/http"
+	"path/filepath"
+
+	"olexsmir.xyz/mugit/internal/git/gitservice"
+)
+
+func (h *handlers) infoRefs(w http.ResponseWriter, r *http.Request) {
+	// TODO: 404 for private repos
+
+	name := filepath.Clean(r.PathValue("name"))
+
+	w.Header().Set("content-type", "application/x-git-upload-pack-advertisement")
+	w.WriteHeader(http.StatusOK)
+
+	if err := gitservice.InfoRefs(
+		filepath.Join(h.c.Repo.Dir, name), // FIXME: use securejoin
+		w,
+	); err != nil {
+		slog.Error("git: info/refs", "err", err)
+		return
+	}
+}
+
+func (h *handlers) uploadPack(w http.ResponseWriter, r *http.Request) {
+	// TODO: 404 for private repos
+
+	name := filepath.Clean(r.PathValue("name"))
+
+	w.Header().Set("content-type", "application/x-git-upload-pack-result")
+	w.Header().Set("Connection", "Keep-Alive")
+	w.Header().Set("Transfer-Encoding", "chunked")
+	w.WriteHeader(http.StatusOK)
+
+	reader := io.Reader(r.Body)
+	if r.Header.Get("Content-Encoding") == "gzip" {
+		gr, err := gzip.NewReader(r.Body)
+		if err != nil {
+			slog.Error("git: gzip reader", "err", err)
+			return
+		}
+		defer gr.Close()
+		reader = gr
+	}
+
+	if err := gitservice.UploadPack(
+		filepath.Join(h.c.Repo.Dir, name),
+		reader,
+		newFlushWriter(w),
+	); err != nil {
+		slog.Error("git: upload-pack", "err", err)
+		return
+	}
+}
+
+type flushWriter struct {
+	w io.Writer
+	f http.Flusher
+}
+
+func newFlushWriter(w http.ResponseWriter) io.Writer {
+	f, _ := w.(http.Flusher)
+	return &flushWriter{w: w, f: f}
+}
+
+func (fw *flushWriter) Write(p []byte) (int, error) {
+	n, err := fw.w.Write(p)
+	if fw.f != nil {
+		fw.f.Flush()
+	}
+	return n, err
+}

M internal/handlers/handles.go

@@ -24,3 +24,24 @@ mux.HandleFunc("GET /", h.index)
 
 	return mux
 }
+
+// multiplex if request smells like gitprotocol-http(5) passes it  to the git
+// http service renders templates.
+func (h *handlers) multiplex(w http.ResponseWriter, r *http.Request) {
+	if r.URL.RawQuery == "service=git-receive-pack" {
+		w.WriteHeader(http.StatusBadRequest)
+		w.Write([]byte("http pushing isn't supported"))
+		return
+	}
+
+	path := r.PathValue("rest")
+	if path == "info/refs" &&
+		r.URL.RawQuery == "service=git-upload-pack" &&
+		r.Method == "GET" {
+		h.infoRefs(w, r)
+	} else if path == "git-upload-pack" && r.Method == "POST" {
+		h.uploadPack(w, r)
+	} else if r.Method == "GET" {
+		h.repoIndex(w, r)
+	}
+}