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Merge pull request #85 from AntonioMeireles/v0.7.x
add support for QCow2 volumes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| // Copyright (c) 2016 by António Meireles <[email protected]>. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
|
|
||
| package server | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/binary" | ||
| "fmt" | ||
| "os" | ||
|
|
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| "github.com/helm/helm/log" | ||
| "github.com/vbatts/qcow2" | ||
| ) | ||
|
|
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| var ErrFileIsNotQCOW2 = fmt.Errorf("File doesn't appear to be a qcow one") | ||
|
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| // adapted from github.com/vbatts/qcow2/cmd/qcow2-info/main.go | ||
| func ValidateQcow2(fh *os.File) (err error) { | ||
| var size int | ||
|
|
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| buf := make([]byte, qcow2.V2HeaderSize) | ||
|
|
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| if size, err = fh.Read(buf); err != nil { | ||
| return | ||
| } | ||
|
|
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| if size >= qcow2.V2HeaderSize && bytes.Compare(buf[:4], qcow2.Magic) != 0 { | ||
| log.Debug("%q: Does not appear to be qcow file %#v %#v", | ||
| fh.Name(), buf[:4], qcow2.Magic) | ||
| return ErrFileIsNotQCOW2 | ||
| } | ||
|
|
||
| q := qcow2.Header{ | ||
| Version: qcow2.Version(be32(buf[4:8])), | ||
| BackingFileOffset: be64(buf[8:16]), | ||
| BackingFileSize: be32(buf[16:20]), | ||
| ClusterBits: be32(buf[20:24]), | ||
| Size: be64(buf[24:32]), | ||
| CryptMethod: qcow2.CryptMethod(be32(buf[32:36])), | ||
| L1Size: be32(buf[36:40]), | ||
| L1TableOffset: be64(buf[40:48]), | ||
| RefcountTableOffset: be64(buf[48:56]), | ||
| RefcountTableClusters: be32(buf[56:60]), | ||
| NbSnapshots: be32(buf[60:64]), | ||
| SnapshotsOffset: be64(buf[64:72]), | ||
| HeaderLength: 72, // v2 this is a standard length | ||
| } | ||
|
|
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| if q.Version == 3 { | ||
| if size, err = fh.Read(buf[:qcow2.V3HeaderSize]); err != nil { | ||
| return fmt.Errorf("(qcow2) error validating %q: %s", | ||
| fh.Name(), err) | ||
| } | ||
| if size < qcow2.V3HeaderSize { | ||
| return fmt.Errorf("(qcow2) error validating %q: short read", | ||
| fh.Name()) | ||
| } | ||
|
|
||
| q.IncompatibleFeatures = be32(buf[0:8]) | ||
| q.CompatibleFeatures = be32(buf[8:16]) | ||
| q.AutoclearFeatures = be32(buf[16:24]) | ||
| q.RefcountOrder = be32(buf[24:28]) | ||
| q.HeaderLength = be32(buf[28:32]) | ||
| } | ||
| if log.IsDebugging { | ||
| log.Info("%#v\n", q) | ||
| log.Info("IncompatibleFeatures: %b\n", q.IncompatibleFeatures) | ||
| log.Info("CompatibleFeatures: %b\n", q.CompatibleFeatures) | ||
| } | ||
| // Process the extension header data | ||
| buf = make([]byte, q.HeaderLength) | ||
| if size, err = fh.Read(buf); err != nil { | ||
| return fmt.Errorf("(qcow2) error validating %q: %s", fh.Name(), err) | ||
| } | ||
| if size < q.HeaderLength { | ||
| return fmt.Errorf("(qcow2) error validating %q: short read", fh.Name()) | ||
| } | ||
| return | ||
| } | ||
|
|
||
| func be32(b []byte) int { | ||
| return int(binary.BigEndian.Uint32(b)) | ||
| } | ||
|
|
||
| func be64(b []byte) int64 { | ||
| return int64(binary.BigEndian.Uint64(b)) | ||
| } |
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