by christian.h7r:

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. Read an existing tar file with tar.Reader
2. Use FileInfo representation of Header (fi := hdr.FileInfo())
3. Call fi.Name()
4. http://play.golang.org/p/yQXR3n1Shf demonstrates the bug.

What is the expected output?
According to the documentation of os.FileInfo I expect the base name as output.

What do you see instead?
The full path of the file in the tar archive.

Which compiler are you using (5g, 6g, 8g, gccgo)?
-

Which operating system are you using?
Ubuntu 13.04 64-bit

Which version are you using?  (run 'go version')
go version go1.1.2 linux/amd64

Please provide any additional information below.

The problem seems to be here:
http://golang.org/src/pkg/archive/tar/common.go?s=2710:2755#L78

The documentation for the Method of this internal struct says it returns the base name,
but it actually returns the full path.