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Commit 53e0636c by Mike Anderson Committed by Michael Anderson
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Cleaned up some tables in checkout-internals doc 

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parent 10edb7a9
Showing with 82 additions and 81 deletions
docs/checkout-internals.md
......@@ -71,19 +71,19 @@ Key
Diff with 2 non-workdir iterators
---------------------------------
Old New
--- ---
0 x x - nothing
1 x B1 - added blob
2 x T1 - added tree
3 B1 x - removed blob
4 B1 B1 - unmodified blob
5 B1 B2 - modified blob
6 B1 T1 - typechange blob -> tree
7 T1 x - removed tree
8 T1 B1 - typechange tree -> blob
9 T1 T1 - unmodified tree
10 T1 T2 - modified tree (implies modified/added/removed blob inside)
| | Old | New | |
|----|-----|-----|------------------------------------------------------------|
| 0 | x | x | nothing |
| 1 | x | B1 | added blob |
| 2 | x | T1 | added tree |
| 3 | B1 | x | removed blob |
| 4 | B1 | B1 | unmodified blob |
| 5 | B1 | B2 | modified blob |
| 6 | B1 | T1 | typechange blob -> tree |
| 7 | T1 | x | removed tree |
| 8 | T1 | B1 | typechange tree -> blob |
| 9 | T1 | T1 | unmodified tree |
| 10 | T1 | T2 | modified tree (implies modified/added/removed blob inside) |
Now, let's make the "New" iterator into a working directory iterator, so
......@@ -92,23 +92,23 @@ we replace "added" items with either untracked or ignored, like this:
Diff with non-work & workdir iterators
--------------------------------------
Old New-WD
--- ------
0 x x - nothing
1 x B1 - untracked blob
2 x Bi - ignored file
3 x T1 - untracked tree
4 x Ti - ignored tree
5 B1 x - removed blob
6 B1 B1 - unmodified blob
7 B1 B2 - modified blob
8 B1 T1 - typechange blob -> tree
9 B1 Ti - removed blob AND ignored tree as separate items
10 T1 x - removed tree
11 T1 B1 - typechange tree -> blob
12 T1 Bi - removed tree AND ignored blob as separate items
13 T1 T1 - unmodified tree
14 T1 T2 - modified tree (implies modified/added/removed blob inside)
| | Old | New | |
|----|-----|-----|------------------------------------------------------------|
| 0 | x | x | nothing |
| 1 | x | B1 | untracked blob |
| 2 | x | Bi | ignored file |
| 3 | x | T1 | untracked tree |
| 4 | x | Ti | ignored tree |
| 5 | B1 | x | removed blob |
| 6 | B1 | B1 | unmodified blob |
| 7 | B1 | B2 | modified blob |
| 8 | B1 | T1 | typechange blob -> tree |
| 9 | B1 | Ti | removed blob AND ignored tree as separate items |
| 10 | T1 | x | removed tree |
| 11 | T1 | B1 | typechange tree -> blob |
| 12 | T1 | Bi | removed tree AND ignored blob as separate items |
| 13 | T1 | T1 | unmodified tree |
| 14 | T1 | T2 | modified tree (implies modified/added/removed blob inside) |
Note: if there is a corresponding entry in the old tree, then a working
directory item won't be ignored (i.e. no Bi or Ti for tracked items).
......@@ -122,46 +122,47 @@ Checkout From 3 Iterators (2 not workdir, 1 workdir)
(base == old HEAD; target == what to checkout; actual == working dir)
base target actual/workdir
---- ------ ------
0 x x x - nothing
1 x x B1/Bi/T1/Ti - untracked/ignored blob/tree (SAFE)
2+ x B1 x - add blob (SAFE)
3 x B1 B1 - independently added blob (FORCEABLE-2)
4* x B1 B2/Bi/T1/Ti - add blob with content conflict (FORCEABLE-2)
5+ x T1 x - add tree (SAFE)
6* x T1 B1/Bi - add tree with blob conflict (FORCEABLE-2)
7 x T1 T1/i - independently added tree (SAFE+MISSING)
8 B1 x x - independently deleted blob (SAFE+MISSING)
9- B1 x B1 - delete blob (SAFE)
10- B1 x B2 - delete of modified blob (FORCEABLE-1)
11 B1 x T1/Ti - independently deleted blob AND untrack/ign tree (SAFE+MISSING !!!)
12 B1 B1 x - locally deleted blob (DIRTY || SAFE+CREATE)
13+ B1 B2 x - update to deleted blob (SAFE+MISSING)
14 B1 B1 B1 - unmodified file (SAFE)
15 B1 B1 B2 - locally modified file (DIRTY)
16+ B1 B2 B1 - update unmodified blob (SAFE)
17 B1 B2 B2 - independently updated blob (FORCEABLE-1)
18+ B1 B2 B3 - update to modified blob (FORCEABLE-1)
19 B1 B1 T1/Ti - locally deleted blob AND untrack/ign tree (DIRTY)
20* B1 B2 T1/Ti - update to deleted blob AND untrack/ign tree (F-1)
21+ B1 T1 x - add tree with locally deleted blob (SAFE+MISSING)
22* B1 T1 B1 - add tree AND deleted blob (SAFE)
23* B1 T1 B2 - add tree with delete of modified blob (F-1)
24 B1 T1 T1 - add tree with deleted blob (F-1)
25 T1 x x - independently deleted tree (SAFE+MISSING)
26 T1 x B1/Bi - independently deleted tree AND untrack/ign blob (F-1)
27- T1 x T1 - deleted tree (MAYBE SAFE)
28+ T1 B1 x - deleted tree AND added blob (SAFE+MISSING)
29 T1 B1 B1 - independently typechanged tree -> blob (F-1)
30+ T1 B1 B2 - typechange tree->blob with conflicting blob (F-1)
31* T1 B1 T1/T2 - typechange tree->blob (MAYBE SAFE)
32+ T1 T1 x - restore locally deleted tree (SAFE+MISSING)
33 T1 T1 B1/Bi - locally typechange tree->untrack/ign blob (DIRTY)
34 T1 T1 T1/T2 - unmodified tree (MAYBE SAFE)
35+ T1 T2 x - update locally deleted tree (SAFE+MISSING)
36* T1 T2 B1/Bi - update to tree with typechanged tree->blob conflict (F-1)
37 T1 T2 T1/T2/T3 - update to existing tree (MAYBE SAFE)
| |base | target | actual/workdir | |
|-----|-----|------- |----------------|--------------------------------------------------------------------|
| 0 | x | x | x | nothing |
| 1 | x | x | B1/Bi/T1/Ti | untracked/ignored blob/tree (SAFE) |
| 2+ | x | B1 | x | add blob (SAFE) |
| 3 | x | B1 | B1 | independently added blob (FORCEABLE-2) |
| 4* | x | B1 | B2/Bi/T1/Ti | add blob with content conflict (FORCEABLE-2) |
| 5+ | x | T1 | x | add tree (SAFE) |
| 6* | x | T1 | B1/Bi | add tree with blob conflict (FORCEABLE-2) |
| 7 | x | T1 | T1/i | independently added tree (SAFE+MISSING) |
| 8 | B1 | x | x | independently deleted blob (SAFE+MISSING) |
| 9- | B1 | x | B1 | delete blob (SAFE) |
| 10- | B1 | x | B2 | delete of modified blob (FORCEABLE-1) |
| 11 | B1 | x | T1/Ti | independently deleted blob AND untrack/ign tree (SAFE+MISSING !!!) |
| 12 | B1 | B1 | x | locally deleted blob (DIRTY || SAFE+CREATE) |
| 13+ | B1 | B2 | x | update to deleted blob (SAFE+MISSING) |
| 14 | B1 | B1 | B1 | unmodified file (SAFE) |
| 15 | B1 | B1 | B2 | locally modified file (DIRTY) |
| 16+ | B1 | B2 | B1 | update unmodified blob (SAFE) |
| 17 | B1 | B2 | B2 | independently updated blob (FORCEABLE-1) |
| 18+ | B1 | B2 | B3 | update to modified blob (FORCEABLE-1) |
| 19 | B1 | B1 | T1/Ti | locally deleted blob AND untrack/ign tree (DIRTY) |
| 20* | B1 | B2 | T1/Ti | update to deleted blob AND untrack/ign tree (F-1) |
| 21+ | B1 | T1 | x | add tree with locally deleted blob (SAFE+MISSING) |
| 22* | B1 | T1 | B1 | add tree AND deleted blob (SAFE) |
| 23* | B1 | T1 | B2 | add tree with delete of modified blob (F-1) |
| 24 | B1 | T1 | T1 | add tree with deleted blob (F-1) |
| 25 | T1 | x | x | independently deleted tree (SAFE+MISSING) |
| 26 | T1 | x | B1/Bi | independently deleted tree AND untrack/ign blob (F-1) |
| 27- | T1 | x | T1 | deleted tree (MAYBE SAFE) |
| 28+ | T1 | B1 | x | deleted tree AND added blob (SAFE+MISSING) |
| 29 | T1 | B1 | B1 | independently typechanged tree -> blob (F-1) |
| 30+ | T1 | B1 | B2 | typechange tree->blob with conflicting blob (F-1) |
| 31* | T1 | B1 | T1/T2 | typechange tree->blob (MAYBE SAFE) |
| 32+ | T1 | T1 | x | restore locally deleted tree (SAFE+MISSING) |
| 33 | T1 | T1 | B1/Bi | locally typechange tree->untrack/ign blob (DIRTY) |
| 34 | T1 | T1 | T1/T2 | unmodified tree (MAYBE SAFE) |
| 35+ | T1 | T2 | x | update locally deleted tree (SAFE+MISSING) |
| 36* | T1 | T2 | B1/Bi | update to tree with typechanged tree->blob conflict (F-1) |
| 37 | T1 | T2 | T1/T2/T3 | update to existing tree (MAYBE SAFE) |
The number is followed by ' ' if no change is needed or '+' if the case
needs to write to disk or '-' if something must be deleted and '*' if
......@@ -169,30 +170,30 @@ there should be a delete followed by an write.
There are four tiers of safe cases:
- SAFE == completely safe to update
- SAFE+MISSING == safe except the workdir is missing the expect content
- MAYBE SAFE == safe if workdir tree matches (or is missing) baseline
* SAFE == completely safe to update
* SAFE+MISSING == safe except the workdir is missing the expect content
* MAYBE SAFE == safe if workdir tree matches (or is missing) baseline
content, which is unknown at this point
- FORCEABLE == conflict unless FORCE is given
- DIRTY == no conflict but change is not applied unless FORCE
* FORCEABLE == conflict unless FORCE is given
* DIRTY == no conflict but change is not applied unless FORCE
Some slightly unusual circumstances:
8 - parent dir is only deleted when file is, so parent will be left if
* 8 - parent dir is only deleted when file is, so parent will be left if
empty even though it would be deleted if the file were present
11 - core git does not consider this a conflict but attempts to delete T1
* 11 - core git does not consider this a conflict but attempts to delete T1
and gives "unable to unlink file" error yet does not skip the rest
of the operation
12 - without FORCE file is left deleted (i.e. not restored) so new wd is
* 12 - without FORCE file is left deleted (i.e. not restored) so new wd is
dirty (and warning message "D file" is printed), with FORCE, file is
restored.
24 - This should be considered MAYBE SAFE since effectively it is 7 and 8
* 24 - This should be considered MAYBE SAFE since effectively it is 7 and 8
combined, but core git considers this a conflict unless forced.
26 - This combines two cases (1 & 25) (and also implied 8 for tree content)
* 26 - This combines two cases (1 & 25) (and also implied 8 for tree content)
which are ok on their own, but core git treat this as a conflict.
If not forced, this is a conflict. If forced, this actually doesn't
have to write anything and leaves the new blob as an untracked file.
32 - This is the only case where the baseline and target values match
* 32 - This is the only case where the baseline and target values match
and yet we will still write to the working directory. In all other
cases, if baseline == target, we don't touch the workdir (it is
either already right or is "dirty"). However, since this case also
......
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