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os: File.Readdir may return nil fileinfo #5960

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hanwen opened this issue Jul 25, 2013 · 5 comments
Closed

os: File.Readdir may return nil fileinfo #5960

hanwen opened this issue Jul 25, 2013 · 5 comments
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Go1.2

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@hanwen
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hanwen commented Jul 25, 2013 

this is with parent: 17384:62d06cccc261 tip

consider 
https://code.google.com/p/go/source/browse/src/pkg/os/file_unix.go#


        fi = make([]FileInfo, len(names))
        for i, filename := range names {
                fip, lerr := Lstat(dirname + filename)
                if err == nil {
                        fi[i] = fip
                        err = lerr
                } else {
                        fi[i] = &fileStat{name: filename}
                }
        }

if lerr != nil, fip may be nil. the docs suggest that the entry for the error should not
be returned.
@rsc
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rsc commented Jul 30, 2013

Comment 1:

This code looks wrong in multiple ways. I don't even know what it's trying to do.

Labels changed: added priority-later, go1.2, removed priority-triage.

Status changed to Accepted.

@PieterD
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PieterD commented Aug 1, 2013

Comment 2:

https://code.google.com/p/go/source/browse/src/pkg/os/file_unix.go#152
line 162: if err == nil {
err is always nil, because it was set on line 158 by Readdirnames, which did not fail.
I'm pretty sure this should be:
line 162: if lerr == nil {
I've been trying to think of a test for this, but it depends on constructing a situation
where Readdirnames() returns a name that Lstat can't touch. Playing with permissions
doesn't work (at least not on linux), so maybe filling a directory with a million files,
and start Readdir() while another goroutine starts removing files.
I'll make a CL tonight.

@PieterD
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PieterD commented Aug 1, 2013

Comment 3:

https://golang.org/cl/12261043/
No test, I just can't make Lstat() fail after Readdirnames() didn't.

@davecheney
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Comment 4:

Status changed to Started.

@bradfitz
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bradfitz commented Aug 8, 2013

Comment 5:

This issue was closed by revision bdbd541.

Status changed to Fixed.

@rsc rsc added this to the Go1.2 milestone Apr 14, 2015
@rsc rsc removed the go1.2 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
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@bradfitz @davecheney @hanwen @rsc @PieterD @gopherbot