package checkout
import (
"context"
"crypto/sha256"
"database/sql"
"encoding/hex"
"encoding/json"
libfossil "github.com/danmestas/go-libfossil/internal/fsltype"
"github.com/danmestas/go-libfossil/internal/manifest"
)
// RequireCommitContent checks parent structure without scanning working files,
// changing the queue, or fetching content. Recovery belongs to the caller.
func (c *Checkout) RequireCommitContent(ctx context.Context) error {
if c == nil || ctx == nil {
panic("checkout.RequireCommitContent: checkout and context must be set")
}
if err := ctx.Err(); err != nil {
return err
}
parent, _, err := c.Version()
if err != nil {
return err
}
parents, err := c.mergeParents(parent)
if err != nil {
return err
}
return manifest.RequireParentContent(ctx, c.repo.DB(), append([]libfossil.FslID{parent}, parents...))
}
// CommitCarriedFiles returns covered baseline files excluded by a commit's
// selection. Explicit paths override the existing queue without changing it.
// It does not scan working files or fetch payloads; the caller intersects these
// immutable identities with repository coverage before recovering missing bytes.
func (c *Checkout) CommitCarriedFiles(ctx context.Context, paths []string) ([]manifest.FileEntry, error) {
if err := c.RequireCommitContent(ctx); err != nil {
return nil, err
}
parent, _, err := c.Version()
if err != nil {
return nil, err
}
entries, _, _, err := c.collectVFileEntries(parent)
if err != nil {
return nil, err
}
queue := c.checkinQueue
if len(paths) > 0 {
queue = make(map[string]bool, len(paths))
for _, name := range paths {
queue[name] = true
}
}
selected, err := c.selectedFiles(entries, queue)
if err != nil || selected == nil {
return nil, err
}
files, err := c.commitBaseline(parent)
if err != nil {
return nil, err
}
carried := make([]manifest.FileEntry, 0, len(files))
for _, file := range files {
if err := ctx.Err(); err != nil {
return nil, err
}
if !selected[file.Name] && c.covers(file.Name) {
carried = append(carried, file)
}
}
return carried, nil
}
// RecoverySnapshot identifies checkout metadata and the in-memory selection
// across an unlocked recovery exchange. Working files are deliberately not
// scanned: a retry must read their fresh bytes rather than cache a file list.
func (c *Checkout) RecoverySnapshot() (string, error) {
if c == nil {
panic("checkout.RecoverySnapshot: nil checkout")
}
tx, err := c.db.Begin()
if err != nil {
return "", err
}
defer tx.Rollback()
digest := sha256.New()
encoder := json.NewEncoder(digest)
queries := []string{
"SELECT name,value FROM vvar WHERE name IN ('checkout','checkout-hash','sparse-cone') ORDER BY name",
"SELECT * FROM vmerge ORDER BY id,merge",
"SELECT * FROM vfile ORDER BY id",
}
var pending bool
if err := tx.QueryRow("SELECT EXISTS(SELECT 1 FROM sqlite_master WHERE type='table' AND name='sparse_pending')").Scan(&pending); err != nil {
return "", err
}
if pending {
queries = append(queries, "SELECT * FROM sparse_pending ORDER BY vid,pathname")
}
for _, query := range queries {
if err := encodeRecoveryRows(tx, encoder, query); err != nil {
return "", err
}
}
if err := encoder.Encode(c.checkinQueue); err != nil {
return "", err
}
return hex.EncodeToString(digest.Sum(nil)), nil
}
func encodeRecoveryRows(tx *sql.Tx, encoder *json.Encoder, query string) error {
if err := encoder.Encode(query); err != nil {
return err
}
rows, err := tx.Query(query)
if err != nil {
return err
}
defer rows.Close()
columns, err := rows.Columns()
if err != nil {
return err
}
if err := encoder.Encode(columns); err != nil {
return err
}
values := make([]any, len(columns))
pointers := make([]any, len(columns))
for i := range values {
pointers[i] = &values[i]
}
for rows.Next() {
if err := rows.Scan(pointers...); err != nil {
return err
}
if err := encoder.Encode(values); err != nil {
return err
}
}
return rows.Err()
}