When a file is not found, it's common to return an error that can
be detected with os.IsNotExist helper. It's possible to use
os.PathError type to satisfy that requirement while still providing
the path information in the error.
Add a test that files that are not found return a non-nil error, and
that the error satisfies os.IsNotFound.
Change-Id: I5f1a26b18f2556af822ede73306541e8575ede28
Reviewed-on: https://go-review.googlesource.com/19503
Reviewed-by: Andrew Gerrand <adg@golang.org>
- add tests for Open, ReadDir, and Stat funcs
- add tests for Seek of Open()
- simplify internal handling of absolute vs. "zip" paths
- fix handling of "/"
The fix special cases this scenario, leaving the codepath for all
other file paths the same. Specifically,
- Exported funcs call stat(), so stat("/") is handled by simply
returning 0 to indicate all entries are (effectively) prefixed
by "/" and zipFI{"", nil} because "/" has no name and nil
indicates it is a directory.
- ReadDir("/") is further handled by seeding the existing lookup
logic with "" instead of what would have been "/". This is
necessary because, per the zipfs spec, the zip file entries MUST
NOT start with "/", so using "/" would incorrectly match nothing.
This works because seeding lookup with "" (correctly) matches
all files and then the following, existing logic (correctly) pares
things down to just the files in the root directory; not in any
subdirectories.
Verified that godoc -zip still works.
Fixesgolang/go#12743
Change-Id: Icb5f01b8a29cefa4e2820135f318894042970301
Reviewed-on: https://go-review.googlesource.com/16925
Reviewed-by: Andrew Gerrand <adg@golang.org>
