pkg/lockfile: nits #1336
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pkg/lockfile: nits #1336
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Since commit 162a0bf, openLock creates a file in case ro argument is set, but the file is created with 0 permission bits. Fix this, and unify the file creation logic while at it. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
unix.Open returns a bare error (like EPERM). This is worked around in on user, (*lockfile).lock, where we panic, but not in the other user, createLockerForPath, and as a result such a bare error might be returned from GetLockfile or GetROLockfile. Wrap it into os.PathError and remove the workaround from lockfile.lock. Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
kolyshkin
commented
Sep 12, 2022
| ) | ||
| flags := os.O_RDONLY | unix.O_CLOEXEC | os.O_CREATE | ||
| if !ro { | ||
| flags |= os.O_RDWR |
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This relies on the fact that O_RDONLY value is 0.
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That’s
- Extremely non-obvious to careless users.
- Not guaranteed to be true, and in fact not true on at least one Go-supported platform right now (though, to be fair, not a platform currently supported by Podman).
Please just do the obviously-correct thing.
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More generally, the assumption is O_RDONLY does not have any bits set that O_RDWR doesn't.
That is true even for zOS (the only Golang platform where O_RDONLY != 0). In zOS, O_RDONLY is 2 and O_RDWR is 3.
Having said that, your code is definitely better as it does not have any such undocumented assumptions.
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Fix one issue and a couple of nits in pkg/lockfile. Please see individual commits for details.