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[#25582] Use a Pathing Jar instead of long command line class paths i…
…n Java Boot loader. (#26087)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one or more | ||
| // contributor license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright ownership. | ||
| // The ASF licenses this file to You 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 main | ||
|
|
||
| import ( | ||
| "archive/zip" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
| "strings" | ||
| ) | ||
|
|
||
| // makePathingJar produces a context or 'pathing' jar which only contains the relative | ||
| // classpaths in its META-INF/MANIFEST.MF. | ||
| // | ||
| // Since we build with Java 8 as a minimum, this is the only supported way of reducing | ||
| // command line length, since argsfile support wasn't added until Java 9. | ||
| // | ||
| // https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html is the spec. | ||
| // | ||
| // In particular, we only need to populate the Jar with a Manifest-Version and Class-Path | ||
| // attributes. | ||
| // Per https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#classpath | ||
| // the classpath URLs must be relative for security reasons. | ||
| func makePathingJar(classpaths []string) (string, error) { | ||
| f, err := os.Create("pathing.jar") | ||
| if err != nil { | ||
| return "", fmt.Errorf("unable to create pathing.jar: %w", err) | ||
| } | ||
| defer f.Close() | ||
| if err := writePathingJar(classpaths, f); err != nil { | ||
| return "", fmt.Errorf("unable to write pathing.jar: %w", err) | ||
| } | ||
| return f.Name(), nil | ||
| } | ||
|
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| var lineBreak = []byte{'\r', '\n'} | ||
| var continuation = []byte{' '} | ||
|
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| func writePathingJar(classpaths []string, w io.Writer) error { | ||
| jar := zip.NewWriter(w) | ||
| defer jar.Close() | ||
|
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| if _, err := jar.Create("META-INF/"); err != nil { | ||
| return fmt.Errorf("unable to create META-INF/ directory: %w", err) | ||
| } | ||
|
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| zf, err := jar.Create("META-INF/MANIFEST.MF") | ||
| if err != nil { | ||
| return fmt.Errorf("unable to create META-INF/MANIFEST.MF: %w", err) | ||
| } | ||
|
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| zf.Write([]byte("Manifest-Version: 1.0")) | ||
| zf.Write(lineBreak) | ||
| zf.Write([]byte("Created-By: sdks/java/container/pathingjar.go")) | ||
| zf.Write(lineBreak) | ||
| // Class-Path: must have a sequence of relative URIs for the paths | ||
| // which we assume outright in this case. | ||
|
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| // We could do this memory efficiently, but it's not worthwhile compared to the complexity | ||
| // at this stage. | ||
| allCPs := "Class-Path: file:" + strings.Join(classpaths, " file:") | ||
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| const lineLenMax = 71 // it's actually 72, but we remove 1 to account for the continuation line prefix. | ||
| buf := make([]byte, lineLenMax) | ||
| cur := 0 | ||
| for cur+lineLenMax < len(allCPs) { | ||
| next := cur + lineLenMax | ||
| copy(buf, allCPs[cur:next]) | ||
| zf.Write(buf) | ||
| zf.Write(lineBreak) | ||
| zf.Write(continuation) | ||
| cur = next | ||
| } | ||
| zf.Write([]byte(allCPs[cur:])) | ||
| zf.Write(lineBreak) | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one or more | ||
| // contributor license agreements. See the NOTICE file distributed with | ||
| // this work for additional information regarding copyright ownership. | ||
| // The ASF licenses this file to You 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 main | ||
|
|
||
| import ( | ||
| "archive/zip" | ||
| "bufio" | ||
| "bytes" | ||
| "io" | ||
| "strings" | ||
| "testing" | ||
| ) | ||
|
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| func TestWritePathingJar(t *testing.T) { | ||
| var buf bytes.Buffer | ||
| input := []string{"a.jar", "b.jar", "c.jar", "thisVeryLongJarNameIsOverSeventyTwoCharactersLongAndNeedsToBeSplitCorrectly.jar"} | ||
| err := writePathingJar(input, &buf) | ||
| if err != nil { | ||
| t.Errorf("writePathingJar(%v) = %v, want nil", input, err) | ||
| } | ||
|
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| zr, err := zip.NewReader(bytes.NewReader(buf.Bytes()), int64(buf.Len())) | ||
| if err != nil { | ||
| t.Errorf("zip.NewReader() = %v, want nil", err) | ||
| } | ||
|
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| f := getManifest(zr) | ||
| if f == nil { | ||
| t.Fatalf("Jar didn't contain manifest") | ||
| } | ||
|
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| { | ||
| fr, err := f.Open() | ||
| if err != nil { | ||
| t.Errorf("(%v).Open() = %v, want nil", f.Name, err) | ||
| } | ||
| all, err := io.ReadAll(fr) | ||
| if err != nil { | ||
| t.Errorf("(%v).Open() = %v, want nil", f.Name, err) | ||
| } | ||
| fr.Close() | ||
| want := "\nClass-Path: file:a.jar file:b.jar file:c.jar" | ||
| if !strings.Contains(string(all), want) { | ||
| t.Errorf("%v = %v, want nil", f.Name, err) | ||
| } | ||
| } | ||
|
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| { | ||
| fr, err := f.Open() | ||
| if err != nil { | ||
| t.Errorf("(%v).Open() = %v, want nil", f.Name, err) | ||
| } | ||
| defer fr.Close() | ||
| fs := bufio.NewScanner(fr) | ||
| fs.Split(bufio.ScanLines) | ||
|
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| for fs.Scan() { | ||
| if got, want := len(fs.Bytes()), 72; got > want { | ||
| t.Errorf("Manifest line exceeds limit got %v:, want %v line: %q", got, want, fs.Text()) | ||
| } | ||
| } | ||
| } | ||
|
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| } | ||
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| // getManifest extracts the java manifest from the zip file. | ||
| func getManifest(zr *zip.Reader) *zip.File { | ||
| for _, f := range zr.File { | ||
| if f.Name != "META-INF/MANIFEST.MF" { | ||
| continue | ||
| } | ||
| return f | ||
| } | ||
| return nil | ||
| } |