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package ingest
import (
"crypto/rand"
"errors"
"fmt"
"io/fs"
"os"
)
// openTemporaryArtifacts creates/open temp pack/idx/(rev) files under destination.
func openTemporaryArtifacts(state *ingestState) error {
packName, packFile, err := createTempFile(state.destination, "tmp_pack_")
if err != nil {
return err
}
idxName, idxFile, err := createTempFile(state.destination, "tmp_idx_")
if err != nil {
_ = packFile.Close()
_ = state.destination.Remove(packName)
return err
}
revName := ""
var revFile *os.File
if state.opts.WriteRev {
revName, revFile, err = createTempFile(state.destination, "tmp_rev_")
if err != nil {
_ = idxFile.Close()
_ = state.destination.Remove(idxName)
_ = packFile.Close()
_ = state.destination.Remove(packName)
return err
}
}
state.packTmpName = packName
state.packFile = packFile
state.idxTmpName = idxName
state.idxFile = idxFile
state.revTmpName = revName
state.revFile = revFile
return nil
}
// closeTemporaryArtifacts closes all temporary artifact file descriptors.
func closeTemporaryArtifacts(state *ingestState) error {
var out error
if state.packFile != nil {
err := state.packFile.Close()
if err != nil && out == nil {
out = err
}
state.packFile = nil
}
if state.idxFile != nil {
err := state.idxFile.Close()
if err != nil && out == nil {
out = err
}
state.idxFile = nil
}
if state.revFile != nil {
err := state.revFile.Close()
if err != nil && out == nil {
out = err
}
state.revFile = nil
}
return out
}
// createTempFile creates one temporary file under root using prefix.
func createTempFile(root *os.Root, prefix string) (string, *os.File, error) {
for range 32 {
name := prefix + rand.Text()
file, err := root.OpenFile(name, os.O_CREATE|os.O_EXCL|os.O_RDWR, 0o644)
if err == nil {
return name, file, nil
}
if errors.Is(err, fs.ErrExist) {
continue
}
return "", nil, fmt.Errorf("format/pack/ingest: create temp file %q: %w", name, err)
}
return "", nil, fmt.Errorf("format/pack/ingest: unable to create temporary file for prefix %q", prefix)
}
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