[go-nuts] How to open file without truncating if it exists

On Fri, Sep 19, 2014 at 1:13 PM, Ondekoza wrote:
Hi,

I try to solve the following problem and I cannot figure out the right
combination of OpenFile arguments.

I am writing a cp clone with a twist:

When I copy a directory hierarchy into another, I _never_ want to overwrite
files. If a file with the exact name already
exists, I want to rename the new file with a new suffix, incrementing a
number.

E.g.

fileA shall be copied to a folder, but fileA is already there, so the new
fileA is renamed to fileA.001 (of course
assuming that fileA.001 does not exist.)

So, how do I open the new fileA for writing, such that it will fail if it
already exists?

Kind regards
Stefan



--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an
email to golang-nuts+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

On Friday, September 19, 2014 11:15:50 AM UTC+2, Konstantin Kulikov wrote:
Use os.Stat() first.