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- Newsgroups: gnu.utils.bug
- Path: sparky!uunet!cis.ohio-state.edu!icule.UUCP!pinard
- From: pinard@icule.UUCP (Francois Pinard)
- Subject: Problem with cp -pf and hard links (bis)
- Message-ID: <9301011852.AA06869@icule.UUCP>
- Sender: gnulists@ai.mit.edu
- Reply-To: pinard@iro.umontreal.ca
- Organization: GNUs Not Usenet
- Distribution: gnu
- Date: Fri, 1 Jan 1993 18:52:13 GMT
- Approved: bug-gnu-utils@prep.ai.mit.edu
- Lines: 65
-
- Here is a script, hopefully reproducible, demonstrating the problem I
- recently described in a previous message. Before trying it, execute
- first the equivalent of (I'm using bash):
-
- cp() { /usr/local/gnubin/cp -i $*; }
- rm() { /usr/local/gnubin/rm -i $*; }
-
- If I copy x3 over x1, x2 will be changed too (this is nice):
-
- ~) echo a > x1
- ~) ln x1 x2
- ~) echo b > x3
- ~) v x*
- -rw-r----- 2 pinard other 2 Jan 1 13:39 x1
- -rw-r----- 2 pinard other 2 Jan 1 13:39 x2
- -rw-r----- 1 pinard other 2 Jan 1 13:40 x3
- ~) cp -p x3 x1
- /usr/local/gnubin/cp: overwrite `x1'? y
- ~) v x*
- -rw-r----- 2 pinard other 2 Jan 1 13:40 x1
- -rw-r----- 2 pinard other 2 Jan 1 13:40 x2
- -rw-r----- 1 pinard other 2 Jan 1 13:40 x3
- ~) cat x2
- b
-
-
- Clean up before retrying:
-
- ~) rm x*
- /usr/local/gnubin/rm: remove `x1'? y
- /usr/local/gnubin/rm: remove `x2'? y
- /usr/local/gnubin/rm: remove `x3'? y
-
-
- I have to revert to using -f for the following to work, the hardlink
- relationship is broken. Copying x3 over x1 does not change x2 (this
- is sad):
-
- ~) echo a > x1
- ~) ln x1 x2
- ~) chmod 440 x1
- ~) echo b > x3
- ~) v x*
- -r--r----- 2 pinard other 2 Jan 1 13:41 x1
- -r--r----- 2 pinard other 2 Jan 1 13:41 x2
- -rw-r----- 1 pinard other 2 Jan 1 13:41 x3
- ~) cp -p x3 x1
- /usr/local/gnubin/cp: overwrite `x1', overriding mode 0440? y
- /usr/local/gnubin/cp: cannot create regular file `x1': Permission denied
- ~) cp -pf x3 x1
- ~) v x*
- -rw-r----- 1 pinard other 2 Jan 1 13:41 x1
- -r--r----- 1 pinard other 2 Jan 1 13:41 x2
- -rw-r----- 1 pinard other 2 Jan 1 13:41 x3
- ~) cat x2
- a
- ~) cat x1
- b
- ~)
-
- --
- Franc,ois Pinard ``Happy GNU Year!'' pinard@iro.umontreal.ca
- (514) 588-4656 ...!uunet!iros1!pinard
- About the League for Programming Freedom? Email me or lpf@uunet.uu.net
-
-