Mercurial > hg
view tests/test-issue4074.t @ 31209:dd2364f5180a
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 | f1ca249696ed |
children | 75be14993fda |
line wrap: on
line source
#require no-pure A script to generate nasty diff worst-case scenarios: $ cat > s.py <<EOF > import random > for x in xrange(100000): > print > if random.randint(0, 100) >= 50: > x += 1 > print hex(x) > EOF $ hg init a $ cd a Check in a big file: $ python ../s.py > a $ hg ci -qAm0 Modify it: $ python ../s.py > a Time a check-in, should never take more than 10 seconds user time: $ hg ci --time -m1 time: real .* secs .user [0-9][.].* sys .* (re)