To deal with CaseFolding on the repo side, we need to:
- escape uppercase ASCII characters in filenames
- escape high ASCII
- Unicode and other characters may be case-folded as well
- Filesystems and operating systems may do other unfortunate things to
- filenames which will cause interoperability trouble
- use the same scheme by default on all systems to avoid backup and media sharing issues
A simple escaping scheme is as follows:
replace _ with __
- replace A-Z with _a, etc.
replace characters 126-255 and '\:*?"<>|' with ~7e to ~ff (note this escapes tilde as well
Note that we rarely need to
Implementation plan:
add separate localrepo access methods for all store data (changelog, manifest, data/*, journal, lock)
if .hg/data exists at localrepo init time, use old access scheme
if not, access all store data with escaped paths inside .hg/store/ (eg .hg/store/00changelog.i or .hg/store/data/_readme.i)
This scheme will automatically escape all paths on newly cloned or created repos.
On the working directory side, the best we can do is detect collisions. A simple scheme might look something like this:
detect case sensitive filesystem at checkout/update time
scan manifest for case-folding collisions and issue a warning
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