I (index) H M Result
-------------------------------------------------------
- 0 nothing nothing nothing (does not happen)
- 1 nothing nothing exists use M
- 2 nothing exists nothing remove path from index
- 3 nothing exists exists, use M if "initial checkout"
+ 0 nothing nothing nothing (does not happen)
+ 1 nothing nothing exists use M
+ 2 nothing exists nothing remove path from index
+ 3 nothing exists exists, use M if "initial checkout"
H == M keep index otherwise
exists fail
H != M
clean I==H I==M
------------------
- 4 yes N/A N/A nothing nothing keep index
- 5 no N/A N/A nothing nothing keep index
+ 4 yes N/A N/A nothing nothing keep index
+ 5 no N/A N/A nothing nothing keep index
- 6 yes N/A yes nothing exists keep index
- 7 no N/A yes nothing exists keep index
- 8 yes N/A no nothing exists fail
- 9 no N/A no nothing exists fail
+ 6 yes N/A yes nothing exists keep index
+ 7 no N/A yes nothing exists keep index
+ 8 yes N/A no nothing exists fail
+ 9 no N/A no nothing exists fail
10 yes yes N/A exists nothing remove path from index
11 no yes N/A exists nothing fail