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localrepo: handle rename with hardlinks properly
In "aftertrans", we rename "journal.*" to "undo.*". We expect "journal.*"
files to disappear after renaming.
However, if "journal.foo" and "undo.foo" refer to a same file (hardlink),
rename may be a no-op, leaving both files on disk, according to Linux
manpage [1]:
If oldpath and newpath are existing hard links referring to the same
file, then rename() does nothing, and returns a suc‐ cess status.
The POSIX specification [2] is not very clear about what to do.
To be safe, remove "undo.*" before the rename so "journal.*" cannot be left
on disk.
[1]: http://man7.org/linux/man-pages/man2/rename.2.html
[2]: http://pubs.opengroup.org/onlinepubs/9699919799/
author | Jun Wu <quark@fb.com> |
---|---|
date | Thu, 02 Mar 2017 21:49:30 -0800 |
parents | f88c60e740a1 |
children | b6db2e80a9ce |
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Ancestors of 5 4 2 0 Ancestors of 6 and 5 3 4 2 1 0 Ancestors of 5 and 4 4 2 0 Ancestors of 7, stop at 6 6 Ancestors of 7, including revs 7 6 5 3 4 2 1 0 Ancestors of 7, 5 and 3, including revs 7 5 3 6 4 2 1 0 Descendants of 5 7 8 Descendants of 5 and 3 6 7 8 Descendants of 5 and 4 5 7 8