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| author | Paul Eggert <eggert@cs.ucla.edu> | 2017-02-11 23:12:31 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2017-02-11 23:14:02 -0800 |
| commit | 376967889ed7ed561e46ff6d88a66779db62737a (patch) | |
| tree | 7ca32f07b738fc2f9902c1643bb01dedb7d1066b /NEWS | |
| parent | 2f69dba5df8caaf9eda658c1808b1379e9949f22 (diff) | |
| download | coreutils-376967889ed7ed561e46ff6d88a66779db62737a.tar.xz | |
ln: replace destination links more atomically
If the file B already exists, commands like 'ln -f A B' and
'cp -fl A B' no longer remove B before creating the new link.
Instead, they arrange for the new link to replace B atomically.
This should fix a race condition reported by Mike Crowe (Bug#25680).
* NEWS, doc/coreutils.texi (cp invocation, ln invocation):
Document this.
* bootstrap.conf (gnulib_modules): Add symlinkat.
* src/copy.c, src/ln.c: Include force-link.h.
* src/copy.c (same_file_ok): It's also OK to remove a destination
symlink when creating symbolic links, or when the source and
destination are on the same file system and when creating hard links.
* src/copy.c (create_hard_link, copy_internal):
* src/ln.c (do_link):
Rewrite using force_linkat and force_symlinkat, to close a window
where the destination temporarily does not exist.
* src/cp.c (main): Do not set x.unlink_dest_before_opening
merely because we are in link-creation mode.
* src/force-link.c, src/force-link.h: New files.
* src/local.mk (copy_sources, src_ln_SOURCES): Add them.
* tests/cp/same-file.sh: Adjust test case to match fixed behavior.
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 10 |
1 files changed, 10 insertions, 0 deletions
@@ -2,12 +2,22 @@ GNU coreutils NEWS -*- outline -*- * Noteworthy changes in release ?.? (????-??-??) [?] +** Improvements + + If the file B already exists, commands like 'ln -f A B' and + 'cp -fl A B' no longer remove B before creating the new link. + That is, there is no longer a brief moment when B does not exist. + ** Bug fixes date again converts from a specified time zone. Previously output was not converted to the local time zone, and remained in the specified one. [bug introduced in coreutils-8.26] + Commands like 'cp --no-dereference -l A B' are no longer quiet no-ops + when A is a regular file and B is a symbolic link that points to A. + [bug introduced in fileutils-4.0] + factor no longer goes into an infinite loop for certain numbers like 158909489063877810457 and 222087527029934481871. [bug introduced in coreutils-8.20] |