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[POSIX] Migrate allows writing checkpoint #906

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Merged
mhutchinson merged 1 commit into from
Mar 17, 2026
Merged

[POSIX] Migrate allows writing checkpoint #906

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18 changes: 14 additions & 4 deletions cmd/experimental/migrate/posix/main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,21 +22,24 @@ import (
"flag"
"net/url"
"os"
"path/filepath"
"strconv"
"strings"

"log/slog"

"github.com/transparency-dev/tessera"
"github.com/transparency-dev/tessera/api/layout"
"github.com/transparency-dev/tessera/client"
"github.com/transparency-dev/tessera/storage/posix"
)

var (
storageDir = flag.String("storage_dir", "", "Root directory to store log data.")
sourceURL = flag.String("source_url", "", "Base URL for the source log.")
numWorkers = flag.Uint("num_workers", 30, "Number of migration worker goroutines.")
slogLevel = flag.Int("slog_level", 0, "The cut-off threshold for structured logging. Default is 0 (INFO). See https://pkg.go.dev/log/slog#Level for other levels.")
storageDir = flag.String("storage_dir", "", "Root directory to store log data.")
sourceURL = flag.String("source_url", "", "Base URL for the source log.")
numWorkers = flag.Uint("num_workers", 30, "Number of migration worker goroutines.")
slogLevel = flag.Int("slog_level", 0, "The cut-off threshold for structured logging. Default is 0 (INFO). See https://pkg.go.dev/log/slog#Level for other levels.")
saveCheckpoint = flag.Bool("save_checkpoint", false, "Set to true to write the checkpoint used during migration. Useful for mirrors.")
)

func main() {
Expand Down Expand Up @@ -87,4 +90,11 @@ func main() {
slog.ErrorContext(ctx, "Migrate failed", slog.Any("error", err))
os.Exit(1)
}

if *saveCheckpoint {
if err := os.WriteFile(filepath.Join(*storageDir, layout.CheckpointPath), sourceCP, 0o644); err != nil {
slog.ErrorContext(ctx, "Failed to write checkpoint", slog.Any("error", err))
os.Exit(1)
}
}
}
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