Bug: packr2 (compiled) finds contents of relative subdirectory instead of packed files

[rfay]

• If you use a directory name (perhaps "assets") in your code where the bundled files are supposed to be.
• But then you run the built executable in a directory that happens to have a directory of that name.
• The files in "assets" in the current directory are listed, instead of the expected files that were bundled into the executable.

A complete and easy demonstration of this (severe) bug is in https://github.com/rfay/packr2_bug,

To recreate this:

1. Build packr2_bug: go install packr2_bug.go
2. Run ~/go/bin/packr2_bug, and you'll see the expected bundled file, "junk-from-packr2.txt"
3. Now mkdir -p /tmp/junk/assets && cd /tmp/junk && touch assets/this-was-in-pwd-assets.txt. You've created a "junk" directory with a subdirectory named "assets", which has a file named "this-was-in-pwd-assets.txt" in it.
4. Run ~/bin/packr2_bug. The output will be the pwd's assets subdirectory ("this-was-in-pwd-assets.txt") instead of the bundled file.