qri component filename in FSI are case-sensitive

[b5]

Environment

What is your OS and version?

OS-X

What version of qri are you using (qri version)?

HEAD

Issue

What did you do?

created an FSI-linked dataset with an upper-case README.md

What happened?

FSI didn't pick up on the readme

What did you expect to happen?

expected Qri to see README.md as a readme component

b5 at b5-2 in ~/datasets/rm_me_3
$ mkdir case_sensitive

b5 at b5-2 in ~/datasets/rm_me_3
$ cd case_sensitive

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ qri init
Name of new dataset [case_sensitive]:
Format of dataset, csv or json [csv]:
initialized working directory for new dataset rm_me_3/case_sensitive

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ qri status
for linked dataset [rm_me_3/case_sensitive]

  add: meta (source: meta.json)
  add: structure (source: structure.json)
  add: body (source: body.csv)

run `qri save` to commit this dataset

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ touch README.md

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ qri status
for linked dataset [rm_me_3/case_sensitive]

  add: meta (source: meta.json)
  add: structure (source: structure.json)
  add: body (source: body.csv)

run `qri save` to commit this dataset

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ mv README.md readme.md

b5 at b5-2 in ~/datasets/rm_me_3/case_sensitive
$ qri status
for linked dataset [rm_me_3/case_sensitive]

  add: meta (source: meta.json)
  add: structure (source: structure.json)
  add: readme (source: readme.md)
  add: body (source: body.csv)

[dustmop]

Should this be true for all components? Is BODY.csv the same as body.csv? On some filesystems these are different filenames, on some they are not. For example, Windows is case-insensitive, but POSIX is case-sensitive.

Probably the most reasonable thing to do is to treat all component filenames as case-sensitive, and treat it as a conflict to have two files with different casing, just like having a meta.json and a dataset.json which has a meta.