On Tue, 9 Jan 2024 10:22:40 GMT, Eirik Bjørsnøs <eir...@openjdk.org> wrote:
>> This PR suggests that `Files.setPosixPermissions`as implemented by >> `ZipFileSystem` should preserve the leading seven bits of the 'external file >> attributes' field. These bits contain the 'file type', 'setuid', 'setgid', >> and 'sticky' bits. These are unrelated to permissions and should not be >> modified by this operation. >> >> The fix is to update `Entry.readCEN` to read all 16 bits instead of just the >> trailing 12 and to update `ZipFileSystem.setPermissions` to preserve the >> leading 7 bits when updating the trailing 9 permission-related bits of the >> `Entry.posixPerms` field. >> >> The PR adds a new test `TestPosix.preserveRemainingBits()` which verifies >> that the leading 7 bits are not affected by `Files.setPosixPermissions`. >> This test also verifies that operations not related to POSIX, such as >> Files.setLastModifiedTime does not affect the 'external file attributes' >> value. >> >> Note that this PR does not aim to preserve the leading seven bits for the >> case when `Files.setPosixPermissions` is called with a `null` permission >> set. (The implementation currently interprets this as a signal that the >> 'external file attributes' should not be populated and the 'version made >> by' OS will be MSDOS instead of Unix) > > Eirik Bjørsnøs has updated the pull request with a new target base due to a > merge or a rebase. The incremental webrev excludes the unrelated changes > brought in by the merge/rebase. The pull request contains three additional > commits since the last revision: > > - Verify that ZipFileSystem preserves 'external file attribute' bits when > performing operations unrelated to POSIX, such as Files.setLastModifiedTime. > - Merge branch 'master' into zipfs-preserve-external-file-attrs > - Preserve non-permission 'external file attributes' bits when setting posix > permissions Realizing that ANY read/sync operation (not just Files.setPosixPermissions) will cause 'external file attribute' bits to be discarded, I tweaked the test added to `PosixTests` to cover such cases. The added test case calls `Files.setLastModifiedTime` and verifies that the 'external file attribute' bits are not changed. ------------- PR Comment: https://git.openjdk.org/jdk/pull/17170#issuecomment-1882797964
