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copy: make backup files more reliably

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* NEWS, doc/coreutils.texi (Backup options): Document the change.
* bootstrap.conf (gnulib_modules): Add backup-rename.
* src/copy.c (copy_internal): Silently switch to numbered backups
if a simple backup might lose data.  Use backup_file_rename
to avoid races with numbered backups.
* tests/cp/backup-is-src.sh, tests/mv/backup-is-src.sh:
Adjust to match new behavior.
This commit is contained in:
Paul Eggert
2017-07-30 17:11:24 -07:00
parent 2ae1460dad
commit 0d74ac470f
6 changed files with 62 additions and 75 deletions
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bootstrap.conf
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@@ -35,6 +35,7 @@ gnulib_modules="
assert
autobuild
backupfile
backup-rename
base32
base64
buffer-lcm