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https://issues.apache.org/jira/browse/COMPRESS-690?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17904784#comment-17904784
]
Gary D. Gregory commented on COMPRESS-690:
------------------------------------------
Hello [~ahmadin]
In CPIO, the link is the file body, see CpioTest.testSymbolicLinkFileEntry():
{code:java}
/**
* Tests COMPRESS-690.
*/
@Test
public void testSymbolicLinkFileEntry() throws Exception {
final File tmp = createTempFile();
final File archive = createTempFile("test.", ".cpio");
final String name = "EntryName";
final String nameLink = "LinkName";
final Charset charset = StandardCharsets.UTF_8;
try (CpioArchiveOutputStream tos = new
CpioArchiveOutputStream(Files.newOutputStream(archive.toPath()))) {
final CpioArchiveEntry entry = new CpioArchiveEntry(name);
entry.setTime(tmp.lastModified() / 1000);
entry.setSize(nameLink.length());
entry.setMode(CpioConstants.C_ISLNK);
assertTrue(entry.isSymbolicLink());
tos.putArchiveEntry(entry);
tos.write(nameLink.getBytes(charset));
tos.closeArchiveEntry();
}
final CpioArchiveEntry entry;
try (CpioArchiveInputStream tis = new
CpioArchiveInputStream(Files.newInputStream(archive.toPath()))) {
entry = tis.getNextEntry();
assertEquals(nameLink, IOUtils.toString(tis, charset));
}
assertNotNull(entry);
assertEquals(name, entry.getName());
assertTrue(entry.isSymbolicLink());
assertEquals(nameLink.length(), entry.getSize());
assertEquals(tmp.lastModified() / 1000,
entry.getLastModifiedDate().getTime() / 1000);
assertFalse(entry.isDirectory());
}
{code}
I don't know if CPIO specifies the byte encoding, probably ASCII but UTF-9 in
the test above.
> CpioArchiveEntry is missing getLinkName
> ---------------------------------------
>
> Key: COMPRESS-690
> URL: https://issues.apache.org/jira/browse/COMPRESS-690
> Project: Commons Compress
> Issue Type: Bug
> Components: Archivers
> Affects Versions: 1.27.1
> Reporter: Ahmadin Badruddin
> Priority: Major
>
> When trying to extract a cpio file that contains a symbolic link, there is a
> method to check if
> CpioArchiveEntry is a symbolic link (entry.isSymbolicLink()), but there is no
> entry.getLinkName. There is a getName, but we cannot create a symlink without
> the target link.
>
> I'm {color:#FF0000}*hoping*{color} I can write a code to extract symlink from
> a cpio like below code snippets
> {code:java}
> public void extractCpioSymbolicLink(File archiveFile, File targetDirectory)
> throws IOException {
> try (CpioArchiveInputStream cpioInputStream = new
> CpioArchiveInputStream(new FileInputStream(archiveFile))) {
> CpioArchiveEntry entry;
> while ((entry = cpioInputStream.getNextEntry()) != null) {
> if (entry.isSymbolicLink()) {
> String linkTarget = entry.getLinkName(); // Get the link
> target
> File linkFile = new File(targetDirectory, entry.getName());
> // Create the symbolic link using the linkTarget on the
> target system
> Files.createSymbolicLink(linkFile.toPath(),
> Paths.get(linkTarget));
> } else {
> // Handle other file types (regular files, directories) as
> needed
> }
> }
> }
> } {code}
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