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Preserve times for fs::copy on Unix. #32067

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Preserve times for fs::copy on Unix. #32067

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pitdicker
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This adds set_times to File so fs::copy can restore the access, modified and created times.
Also permissions are now set during file creation, as a partly fix for #26933.

I did not test the code for setting the creation time, as I do not have BSD.
It probably works as long as the creation time is earlier than what it is currently set to.
If we want to make a method like this public, we probably should add a way to keep some times the same, or set them to the current time.

There are still some things left for #26933, like copying attributes, extended attributes and ACLs.

@pitdicker
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r? @alexcrichton

@pitdicker
Preserve times for fs::copy on Unix.
30bc501 
This adds `set_times` to `File` so `fs::copy` can restore
the access, modified and created times.
Also permissions are now set during file creation, as
a partly fix for #26933.
alexcrichton
alexcrichton reviewed Mar 6, 2016
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src/libstd/sys/unix/fs.rs
if !from.is_file() {
use fs::OpenOptions;
let mut from_opts = OpenOptions::new();
let mut reader = try!(from_opts.read(true).open(&from));
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Shouldn't this be the same as File::open?

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Now I don't remember why I changed that...
If I don't find the reason I will change it back.

@alexcrichton
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I'm curious if other versions of this function in other libraries also copy times by default? I wonder if this should perhaps be an opt-in behavior?

@pitdicker
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I would have to look, but I think it is nice to imitate cp as close as possible on Unix

@pitdicker
Fix test
81a75da 
Before, copy2 accidentally worked because `!is_file()`
returned false when the file does not exists. But `fs::copy`
assumed it was a dir, and gives `InvalidInput`.
So `InvalidInput` was not caused by the nul for the destination
path, what we are testing for.
@alexcrichton alexcrichton self-assigned this Mar 6, 2016
@alexcrichton
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Ah ok, if cp does it, and Windows already does it that sounds like precedent enough to me!

@nodakai
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nodakai commented Mar 23, 2016

cp(1) copies the original timestamp only if told

$ cp /etc/protocols .
$ ls -l protocols
-rw-r--r-- 1 nodakai nodakai 6.4K Mar 23 20:15 protocols
$ cp -a /etc/protocols .
$ ls -l protocols
-rw-r--r-- 1 nodakai nodakai 6.4K Jan 12  2010 protocols

This is probably for avoiding possible performance hit caused by inode access.

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bors commented Mar 23, 2016

☔ The latest upstream changes (presumably #32390) made this pull request unmergeable. Please resolve the merge conflicts.

@alexcrichton
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Closing due to inactivity, but feel free to resubmit with a rebase!

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@pitdicker @alexcrichton @nodakai @bors