func reader(t *testing.T, tname string, buf *bytes.Buffer, atype string, fname string) archive.ReadCloser {
switch atype {
case gzipType:
gr, err := gzip.NewReader(buf, fname)
if err != nil {
t.Fatalf("%s: %v", tname, err)
}
return gr
case tarType:
return archive.NopCloser(tar.NewReader(buf))
case zipType:
zr, err := zip.NewReader(
bytes.NewReader(buf.Bytes()),
int64(buf.Len()))
if err != nil {
t.Fatalf("%s: new zip reader: %v", tname, err)
}
return archive.NopCloser(zr)
}
t.Fatalf("%s: unrecognized archive type: %s", tname, atype)
panic("execution continued after (*testing.T).Fatalf")
}
}
return archive.NopCloser(r), nil
},
},
rollingArchiveGzip: {
extension: ".gz",
handleMultipleEntries: false,
archiver: func(f *os.File, exploded bool) archive.WriteCloser {
gw := gzip.NewWriter(f)
if exploded {
return gw
}
return tar.NewWriteMultiCloser(gw, gw)
},
unarchiver: func(f *os.File) (archive.ReadCloser, error) {
gr, err := gzip.NewReader(f, f.Name())
if err != nil {
return nil, err
}
// Determine if the gzip is a tar
tr := tar.NewReader(gr)
_, err = tr.Next()
isTar := err == nil
// Reset to beginning of file
if _, err := f.Seek(0, os.SEEK_SET); err != nil {
return nil, err
}
gr.Reset(f)