On Sat, Feb 26, 2005 at 12:12:31AM +0100, Torsten Landschoff wrote: > During upgrades the slapd package (for example) has to do some > adjustments on config files (it asks the user for permission of course). > > Problem: How do I make sure the new config files have the same > permissions!? Currently I do > > chmod --reference=OLD NEW > chown --reference=OLD NEW > mv NEW OLD > > but this will break with ACLs. And what happens with SELinux!? Can't > find anything in debian-policy about it, shouldn't we define that > handling?
You can't solve this problem atomically. However, you can do this: mv OLD TMP cat NEW > TMP mv TMP OLD rm NEW Which is almost as good. The point being that rather than create a new file, you truncate the old one and replace its contents (but avoid ever leaving a half-populated file in place; no file is better than a mangled file). -- .''`. ** Debian GNU/Linux ** | Andrew Suffield : :' : http://www.debian.org/ | `. `' | `- -><- |
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