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sftp: Annotate a few errors

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This commit is contained in:
Alexander Neumann 2015-05-03 21:06:20 +02:00
parent 13a42ec5ec
commit 250080db9c
1 changed files with 7 additions and 9 deletions
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16
backend/sftp/sftp.go
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@ -4,7 +4,6 @@ import (
"crypto/rand"
"crypto/sha256"
"encoding/hex"
"errors"
"fmt"
"io"
"io/ioutil"
@ -15,6 +14,7 @@ import (
"sort"
"strings"
"github.com/juju/errors"
"github.com/pkg/sftp"
"github.com/restic/restic/backend"
)
@ -245,13 +245,11 @@ func (r *SFTP) Location() string {
func (r *SFTP) tempFile() (string, *sftp.File, error) {
// choose random suffix
buf := make([]byte, tempfileRandomSuffixLength)
n, err := io.ReadFull(rand.Reader, buf)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
return "", nil, err
}
if n != len(buf) {
return "", nil, errors.New("unable to generate enough random bytes for temp file")
return "", nil, errors.Annotatef(err,
"unable to read %d random bytes for tempfile name",
tempfileRandomSuffixLength)
}
// construct tempfile name
@ -260,7 +258,7 @@ func (r *SFTP) tempFile() (string, *sftp.File, error) {
// create file in temp dir
f, err := r.c.Create(name)
if err != nil {
return "", nil, err
return "", nil, errors.Annotatef(err, "creating tempfile %q failed", name)
}
return name, f, nil
@ -375,7 +373,7 @@ func (r *SFTP) Create() (backend.Blob, error) {
// create tempfile in backend
filename, file, err := r.tempFile()
if err != nil {
return nil, err
return nil, errors.Annotate(err, "create tempfile")
}
blob := sftpBlob{