Simplify: centralize paths in layout, dedup zfs snapshot refs, remove dead code

- Add layout.Config methods (ReleasesDir, PostReceiveHookPath, RCScriptPath,
  RCConfPath) so main.go and jailmgr no longer hand-build paths that layout
  already owns.
- Extract zfsutil.snapRef to replace three inline dataset@tag Sprintfs.
- Remove seven unused exported functions (zfsutil.Exists, jailmgr.Stop,
  sh.RunWithStdinFile, and four dead layout.Config path methods) and their
  now-unused imports.

1 files changed, 0 insertions, 21 deletions

diff --git a/internal/sh/sh.go b/internal/sh/sh.go
index b5f6f49..6e12886 100644
--- a/internal/sh/sh.go
+++ b/internal/sh/sh.go
@@ -6,7 +6,6 @@ import (
 	"context"
 	"fmt"
 	"io"
-	"os"
 	"os/exec"
 )
 
@@ -43,23 +42,3 @@ func CombinedOutput(ctx context.Context, dir string, name string, args ...string
 	b, err := cmd.CombinedOutput()
 	return string(b), err
 }
-
-// RunWithStdinFile runs a command with stdinPath fed to its stdin, e.g.
-// piping a migration file into `sqlite3 db`.
-func RunWithStdinFile(ctx context.Context, out io.Writer, dir, stdinPath, name string, args ...string) error {
-	f, err := os.Open(stdinPath)
-	if err != nil {
-		return fmt.Errorf("open %s: %w", stdinPath, err)
-	}
-	defer f.Close()
-
-	cmd := exec.CommandContext(ctx, name, args...)
-	cmd.Dir = dir
-	cmd.Stdin = f
-	cmd.Stdout = out
-	cmd.Stderr = out
-	if err := cmd.Run(); err != nil {
-		return fmt.Errorf("%s %v < %s: %w", name, args, stdinPath, err)
-	}
-	return nil
-}