Ensure reference hooks are used in valid commands

8 files changed, 303 insertions, 207 deletions

diff --git a/changelogs/unreleased/po-ref-hook-env-vars.yml b/changelogs/unreleased/po-ref-hook-env-vars.yml
new file mode 100644
index 000000000..8ff0124cb
--- /dev/null
+++ b/changelogs/unreleased/po-ref-hook-env-vars.yml
@@ -0,0 +1,5 @@
+---
+title: Ensure reference hooks are used in valid commands
+merge_request: 2583
+author:
+type: other
diff --git a/internal/git/hooks.go b/internal/git/hooks.go
index fe4fe17bf..faf98281a 100644
--- a/internal/git/hooks.go
+++ b/internal/git/hooks.go
@@ -14,12 +14,18 @@ import (
 // repository changes that may possibly update references
 func WithRefTxHook(ctx context.Context, repo *gitalypb.Repository, cfg config.Cfg) CmdOpt {
 	return func(cc *cmdCfg) error {
+		if repo == nil {
+			return fmt.Errorf("missing repo: %w", ErrInvalidArg)
+		}
+
 		rfEnvs, err := refHookEnv(ctx, repo, cfg)
 		if err != nil {
 			return fmt.Errorf("ref hook env var: %w", err)
 		}
 
 		cc.env = append(cc.env, rfEnvs...)
+		cc.refHookConfigured = true
+
 		return nil
 	}
 }
@@ -38,3 +44,17 @@ func refHookEnv(ctx context.Context, repo *gitalypb.Repository, cfg config.Cfg)
 		fmt.Sprintf("%s=true", featureflag.ReferenceTransactionHookEnvVar),
 	}, nil
 }
+
+type refHookRequired struct{}
+
+// RequireRefHook updates the context to indicate a ref hook is required for
+// the current operation
+func RequireRefHook(ctx context.Context) context.Context {
+	return context.WithValue(ctx, refHookRequired{}, true)
+}
+
+// IsRefHookRequired returns true if the context has been marked to indicate a
+// ref hook may be required
+func IsRefHookRequired(ctx context.Context) bool {
+	return ctx.Value(refHookRequired{}) != nil
+}
diff --git a/internal/git/hooks_test.go b/internal/git/hooks_test.go
index a2a3726a3..edde977af 100644
--- a/internal/git/hooks_test.go
+++ b/internal/git/hooks_test.go
@@ -24,7 +24,7 @@ func TestWithRefHook(t *testing.T) {
 	config.Config.Auth.Token = token
 
 	opt := git.WithRefTxHook(ctx, testRepo, config.Config)
-	subCmd := git.SubCmd{Name: "log", Flags: []git.Option{git.Flag{"-0"}}}
+	subCmd := git.SubCmd{Name: "update-ref", Args: []string{"master", "0000"}}
 
 	for _, tt := range []struct {
 		name string
diff --git a/internal/git/safecmd.go b/internal/git/safecmd.go
index 106ada62b..d88c29513 100644
--- a/internal/git/safecmd.go
+++ b/internal/git/safecmd.go
@@ -39,6 +39,7 @@ func incrInvalidArg(subcmdName string) {
 type Cmd interface {
 	ValidateArgs() ([]string, error)
 	IsCmd()
+	Subcommand() string
 }
 
 // SubCmd represents a specific git command
@@ -60,6 +61,9 @@ var subCmdNameRegex = regexp.MustCompile(`^[[:alnum:]]+(-[[:alnum:]]+)*$`)
 // IsCmd allows SubCmd to satisfy the Cmd interface
 func (sc SubCmd) IsCmd() {}
 
+// Subcommand returns the subcommand name
+func (sc SubCmd) Subcommand() string { return sc.Name }
+
 func (sc SubCmd) supportsEndOfOptions() bool {
 	switch sc.Name {
 	case "checkout", "linguist", "for-each-ref", "archive", "upload-archive", "grep", "clone", "config", "rev-parse", "remote", "blame", "ls-tree":
@@ -220,10 +224,11 @@ func ConvertGlobalOptions(options *gitalypb.GlobalOptions) []Option {
 }
 
 type cmdCfg struct {
-	env    []string
-	stdin  io.Reader
-	stdout io.Writer
-	stderr io.Writer
+	env               []string
+	stdin             io.Reader
+	stdout            io.Writer
+	stderr            io.Writer
+	refHookConfigured bool
 }
 
 // CmdOpt is an option for running a command
@@ -253,12 +258,29 @@ func WithStderr(w io.Writer) CmdOpt {
 	}
 }
 
-func handleOpts(cc *cmdCfg, opts []CmdOpt) error {
+var (
+	// ErrRefHookRequired indicates a ref hook configuration is needed but
+	// absent from the command
+	ErrRefHookRequired = errors.New("ref hook is required but not configured")
+	// ErrRefHookNotRequired indicates an extraneous ref hook option was
+	// provided
+	ErrRefHookNotRequired = errors.New("ref hook is configured but not required")
+)
+
+func handleOpts(ctx context.Context, sc Cmd, cc *cmdCfg, opts []CmdOpt) error {
 	for _, opt := range opts {
 		if err := opt(cc); err != nil {
 			return err
 		}
 	}
+
+	if IsRefHookRequired(ctx) && !cc.refHookConfigured && mayUpdateRef(sc.Subcommand()) {
+		return fmt.Errorf("subcommand %q: %w", sc.Subcommand(), ErrRefHookRequired)
+	}
+	if cc.refHookConfigured && !mayUpdateRef(sc.Subcommand()) {
+		return fmt.Errorf("subcommand %q: %w", sc.Subcommand(), ErrRefHookNotRequired)
+	}
+
 	return nil
 }
 
@@ -273,7 +295,7 @@ func SafeCmd(ctx context.Context, repo repository.GitRepo, globals []Option, sc
 func SafeCmdWithEnv(ctx context.Context, env []string, repo repository.GitRepo, globals []Option, sc Cmd, opts ...CmdOpt) (*command.Command, error) {
 	cc := &cmdCfg{}
 
-	if err := handleOpts(cc, opts); err != nil {
+	if err := handleOpts(ctx, sc, cc, opts); err != nil {
 		return nil, err
 	}
 
@@ -294,7 +316,7 @@ func SafeCmdWithEnv(ctx context.Context, env []string, repo repository.GitRepo,
 func SafeBareCmd(ctx context.Context, stream CmdStream, env []string, globals []Option, sc Cmd, opts ...CmdOpt) (*command.Command, error) {
 	cc := &cmdCfg{}
 
-	if err := handleOpts(cc, opts); err != nil {
+	if err := handleOpts(ctx, sc, cc, opts); err != nil {
 		return nil, err
 	}
 
@@ -326,7 +348,7 @@ func SafeBareCmdInDir(ctx context.Context, dir string, stream CmdStream, env []s
 func SafeStdinCmd(ctx context.Context, repo repository.GitRepo, globals []Option, sc SubCmd, opts ...CmdOpt) (*command.Command, error) {
 	cc := &cmdCfg{}
 
-	if err := handleOpts(cc, opts); err != nil {
+	if err := handleOpts(ctx, sc, cc, opts); err != nil {
 		return nil, err
 	}
 
diff --git a/internal/git/subcommand.go b/internal/git/subcommand.go
new file mode 100644
index 000000000..902bc7760
--- /dev/null
+++ b/internal/git/subcommand.go
@@ -0,0 +1,50 @@
+package git
+
+// Curated list of Git command names for special git.SafeCmd validation logic
+const (
+	scCatFile        = "cat-file"
+	scLog            = "log"
+	scForEachRef     = "for-each-ref"
+	scRevParse       = "rev-parse"
+	scCountObjects   = "count-objects"
+	scConfig         = "config"
+	scMultiPackIndex = "multi-pack-index"
+	scRepack         = "repack"
+	scDiff           = "diff"
+	scPackRefs       = "pack-refs"
+	scMergeBase      = "merge-base"
+)
+
+var knownReadOnlyCmds = map[string]struct{}{
+	scCatFile:      struct{}{},
+	scLog:          struct{}{},
+	scForEachRef:   struct{}{},
+	scRevParse:     struct{}{},
+	scCountObjects: struct{}{},
+	scDiff:         struct{}{},
+	scMergeBase:    struct{}{},
+}
+
+// knownNoRefUpdates indicates all repo mutating commands where it is known
+// whether references are never updated
+var knownNoRefUpdates = map[string]struct{}{
+	scConfig:         struct{}{},
+	scMultiPackIndex: struct{}{},
+	scRepack:         struct{}{},
+	scPackRefs:       struct{}{},
+}
+
+// mayUpdateRef indicates if a subcommand is known to update references.
+// This is useful to determine if a command requires reference hook
+// configuration. A non-exhaustive list of commands is consulted to determine if
+// refs are updated. When unknown, true is returned to err on the side of
+// caution.
+func mayUpdateRef(subcmd string) bool {
+	if _, ok := knownReadOnlyCmds[subcmd]; ok {
+		return false
+	}
+	if _, ok := knownNoRefUpdates[subcmd]; ok {
+		return false
+	}
+	return true
+}
diff --git a/internal/praefect/protoregistry/protoregistry_test.go b/internal/praefect/protoregistry/protoregistry_test.go
index df7874404..00ecb31f7 100644
--- a/internal/praefect/protoregistry/protoregistry_test.go
+++ b/internal/praefect/protoregistry/protoregistry_test.go
@@ -124,7 +124,7 @@ func TestNewProtoRegistry(t *testing.T) {
 			"ApplyGitattributes":           protoregistry.OpMutator,
 			"FetchRemote":                  protoregistry.OpMutator,
 			"CreateRepository":             protoregistry.OpMutator,
-			"GetArchive":                   protoregistry.OpMutator,
+			"GetArchive":                   protoregistry.OpAccessor,
 			"HasLocalBranches":             protoregistry.OpAccessor,
 			"FetchSourceBranch":            protoregistry.OpMutator,
 			"Fsck":                         protoregistry.OpMutator,
diff --git a/proto/go/gitalypb/repository-service.pb.go b/proto/go/gitalypb/repository-service.pb.go
index 33ee82d13..50ea46957 100644
--- a/proto/go/gitalypb/repository-service.pb.go
+++ b/proto/go/gitalypb/repository-service.pb.go
@@ -4097,202 +4097,201 @@ func init() {
 func init() { proto.RegisterFile("repository-service.proto", fileDescriptor_e9b1768cf174c79b) }
 
 var fileDescriptor_e9b1768cf174c79b = []byte{
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 }
 
 // Reference imports to suppress errors if they are not otherwise used.
diff --git a/proto/repository-service.proto b/proto/repository-service.proto
index 23216124e..e7d921b85 100644
--- a/proto/repository-service.proto
+++ b/proto/repository-service.proto
@@ -60,7 +60,7 @@ service RepositoryService {
   }
   rpc GetArchive(GetArchiveRequest) returns (stream GetArchiveResponse) {
     option (op_type) = {
-      op: MUTATOR
+      op: ACCESSOR
     };
   }
   rpc HasLocalBranches(HasLocalBranchesRequest) returns (HasLocalBranchesResponse) {