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package testgit
import (
"os/exec"
"strings"
"testing"
)
// PackObjectsIsThin reports whether git emits one thin pack for the given revs.
//
// It streams `git pack-objects --stdout --revs --thin` into `git index-pack
// --stdin` in one scratch bare repository. A failure in index-pack due to
// unresolved deltas is treated as confirmation that the emitted pack is thin.
func (testRepo *TestRepo) PackObjectsIsThin(tb testing.TB, revs []string) bool {
tb.Helper()
scratch := NewRepo(tb, RepoOptions{ObjectFormat: testRepo.algo, Bare: true})
packArgs := []string{"pack-objects", "--stdout", "--revs", "--thin"}
//nolint:noctx
packCmd := exec.Command("git", packArgs...) //#nosec G204
packCmd.Dir = testRepo.dir
packCmd.Env = testRepo.env
packCmd.Stdin = strings.NewReader(strings.Join(revs, "\n") + "\n")
packStderr := &strings.Builder{}
packCmd.Stderr = packStderr
packStdout, err := packCmd.StdoutPipe()
if err != nil {
tb.Fatalf("git %v stdout pipe: %v", packArgs, err)
}
indexArgs := []string{"index-pack", "--stdin"}
//nolint:noctx
indexCmd := exec.Command("git", indexArgs...) //#nosec G204
indexCmd.Dir = scratch.dir
indexCmd.Env = scratch.env
indexCmd.Stdin = packStdout
indexStderr := &strings.Builder{}
indexCmd.Stderr = indexStderr
err = indexCmd.Start()
if err != nil {
tb.Fatalf("git %v start failed: %v", indexArgs, err)
}
err = packCmd.Start()
if err != nil {
_ = indexCmd.Process.Kill()
_ = indexCmd.Wait()
tb.Fatalf("git %v start failed: %v", packArgs, err)
}
packErr := packCmd.Wait()
if packErr != nil {
tb.Fatalf("git %v failed: %v\n%s", packArgs, packErr, packStderr.String())
}
indexErr := indexCmd.Wait()
if indexErr == nil {
return false
}
stderr := strings.ToLower(indexStderr.String())
if strings.Contains(stderr, "unresolved") && strings.Contains(stderr, "delta") {
return true
}
if strings.Contains(stderr, "missing") && strings.Contains(stderr, "base") {
return true
}
tb.Fatalf("git %v failed unexpectedly: %v\n%s", indexArgs, indexErr, indexStderr.String())
return false
}
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