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Fixes https://github.com/rfjakob/gocryptfs/issues/453
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On Fedora, /tmp is tmpfs, which behaves differently than ext4
(inode numbers are never reused, for example).
Use /var/tmp, which is ext4 on Fedora, to get a more realistic
test environment.
This also allows us to drop the xattr workaround.
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Setting/removing extended attributes on directories was partially fixed with
commit eff35e60b63331e3e10f921792baa10b236a721d. However, on most file systems
it is also possible to do these operations without read access (see tests).
Since we cannot open a write-access fd to a directory, we have to use the
/proc/self/fd trick (already used for ListXAttr) for the other operations aswell.
For simplicity, let's separate the Linux and Darwin code again (basically revert
commit f320b76fd189a363a34bffe981aa67ab97df3362), and always use the
/proc/self/fd trick on Linux. On Darwin we use the best-effort approach with
openBackingFile() as a fallback.
More discussion about the available options is available in
https://github.com/rfjakob/gocryptfs/issues/308.
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Directories cannot be opened read-write. Retry with RDONLY.
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https://github.com/rfjakob/gocryptfs/issues/308
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Make clear what we have and what we want.
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An Open() a fifo blocks until it is opened for writing.
This meant that xattr operations on FIFOs would block.
Pass O_NONBLOCK to fix that, and add a test.
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Test for the upcoming fd-based xattr support.
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Setting TMPDIR now allows to run the tests against
a directory of your choice, making it easier to test
different filesystems.
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Support has been merged into the xattr package
( https://github.com/pkg/xattr/pull/29 ), use it.
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Values a binary-safe, there is no need to base64-encode them.
Old, base64-encoded values are supported transparently
on reading. Writing xattr values now always writes them binary.
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Now that https://github.com/pkg/xattr/pull/24
has been merged there is no reason to keep
our private copy.
Switch to the upstream version.
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This function has been deprecated by the pkg/xattr
upstream, so write our own.
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We handle empty files by storing an actual empty file
on disk. Handle xattrs similarily and encrypt the
empty value to the empty value.
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At the moment, only for reverse mode.
https://github.com/rfjakob/gocryptfs/issues/217
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