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tools: introduce tool.Spool{,Name}

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This commit is contained in:
Taylor Blau 2017-02-11 06:36:14 -07:00
parent 2f85ddbffa
commit c381d6a5c1
1 changed files with 43 additions and 0 deletions
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43
tools/iotools.go
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@ -3,8 +3,12 @@ package tools
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"hash"
"io"
"io/ioutil"
"os"
"time"
"github.com/git-lfs/git-lfs/errors"
"github.com/git-lfs/git-lfs/progress"
@ -89,3 +93,42 @@ func (r *RetriableReader) Read(b []byte) (int, error) {
return n, errors.NewRetriableError(err)
}
// Spool spools the contents from 'from' to 'to' by buffering the entire
// contents of 'from' into a temprorary file, first.
//
// A name of "lfs-<time>" is used, where "<time>" is the number of seconds since
// the Unix epoch.
//
// The temporary file is cleaned up after the copy is complete.
//
// The number of bytes written to "to", as well as any error encountered are
// returned.
func Spool(to io.Writer, from io.Reader) (n int64, err error) {
return SpoolName(to, from, fmt.Sprintf("lfs-%d", time.Now().Unix()))
}
// Spool spools the contents from 'from' to 'to' by buffering the entire
// contents of 'from' into a temprorary file named "name", first.
//
// The temporary file is cleaned up after the copy is complete.
//
// The number of bytes written to "to", as well as any error encountered are
// returned.
func SpoolName(to io.Writer, from io.Reader, name string) (n int64, err error) {
tmp, err := ioutil.TempFile("", name)
if err != nil {
return 0, errors.Wrap(err, "spool tmp.")
}
defer os.Remove(tmp.Name())
if n, err = io.Copy(tmp, from); err != nil {
return n, errors.Wrap(err, "unable to spool")
}
if _, err = tmp.Seek(0, io.SeekStart); err != nil {
return 0, errors.Wrap(err, "unable to seek")
}
return io.Copy(to, tmp)
}