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semi-atomic vendoring to improve concurrency

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Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>
This commit is contained in:
Andrea Luzzardi
2021-12-23 17:48:28 +01:00
parent bbec566bb5
commit 25ee7087bf
2 changed files with 29 additions and 8 deletions
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28
state/project.go
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@@ -428,12 +428,38 @@ func VendorUniverse(ctx context.Context, p string) error {
}
log.Ctx(ctx).Debug().Str("mod", p).Msg("vendoring universe")
if err := stdlib.Vendor(ctx, p); err != nil {
// Vendor in a temporary directory
tmp, err := os.MkdirTemp(path.Join(p, "cue.mod", "pkg"), "vendor-*")
if err != nil {
return err
}
if err := stdlib.Vendor(ctx, tmp); err != nil {
// FIXME(samalba): disabled install remote stdlib temporarily
// if _, err := mod.Install(ctx, p, stdlib.ModuleName, ""); err != nil {
return err
}
// Semi-atomic swap of the vendor directory
// The following basically does:
// rm -rf cue.mod/pkg/MODULE.old
// mv cue.mod/pkg/MODULE cue.mod/pkg/MODULE.old
// mv VENDOR cue.mod/pkg/MODULE
// rm -rf cue.mod/pkg/MODULE.old
newStdlib := path.Join(p, stdlib.Path)
oldStdlib := newStdlib + ".old"
if err := os.RemoveAll(oldStdlib); err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
if err := os.Rename(newStdlib, oldStdlib); err != nil && !errors.Is(err, os.ErrNotExist) {
return err
}
defer os.RemoveAll(oldStdlib)
if err := os.Rename(tmp, newStdlib); err != nil {
return err
}
return nil
}