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|
(* Unison file synchronizer: src/common.ml *)
(* Copyright 1999-2018, Benjamin C. Pierce
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
type hostname = string
(* Canonized roots *)
type host =
Local
| Remote of hostname
type root = host * Fspath.t
type 'a oneperpath = ONEPERPATH of 'a list
(* ------------------------------------------------------------------------- *)
(* Printing *)
(* ------------------------------------------------------------------------- *)
let root2hostname root =
match root with
(Local, _) -> "local"
| (Remote host, _) -> host
let root2string root =
match root with
(Local, fspath) -> Fspath.toPrintString fspath
| (Remote host, fspath) -> "//"^host^"/"^(Fspath.toPrintString fspath)
(* ------------------------------------------------------------------------- *)
(* Root comparison *)
(* ------------------------------------------------------------------------- *)
let compareRoots x y =
match x,y with
(Local,fspath1), (Local,fspath2) ->
(* FIX: This is a path comparison, should it take case
sensitivity into account ? *)
Fspath.compare fspath1 fspath2
| (Local,_), (Remote _,_) -> -1
| (Remote _,_), (Local,_) -> 1
| (Remote host1, fspath1), (Remote host2, fspath2) ->
let result =
(* FIX: Should this ALWAYS be a case insensitive compare? *)
compare host1 host2 in
if result = 0 then
(* FIX: This is a path comparison, should it take case
sensitivity into account ? *)
Fspath.compare fspath1 fspath2
else
result
let sortRoots rootList = Safelist.sort compareRoots rootList
(* ---------------------------------------------------------------------- *)
type prevState =
Previous of Fileinfo.typ * Props.t * Os.fullfingerprint * Osx.ressStamp
| New
type contentschange =
ContentsSame
| ContentsUpdated of Os.fullfingerprint * Fileinfo.stamp * Osx.ressStamp
type permchange = PropsSame | PropsUpdated
type updateItem =
NoUpdates (* Path not changed *)
| Updates (* Path changed in this replica *)
of updateContent (* - new state *)
* prevState (* - summary of old state *)
| Error (* Error while detecting updates *)
of string (* - description of error *)
and updateContent =
Absent (* Path refers to nothing *)
| File (* Path refers to an ordinary file *)
of Props.t (* - summary of current state *)
* contentschange (* - hint to transport agent *)
| Dir (* Path refers to a directory *)
of Props.t (* - summary of current state *)
* (Name.t * updateItem) list (* - children;
MUST KEEP SORTED for recon *)
* permchange (* - did permissions change? *)
* bool (* - is the directory now empty? *)
| Symlink (* Path refers to a symbolic link *)
of string (* - link text *)
(* ------------------------------------------------------------------------- *)
type status =
[ `Deleted
| `Modified
| `PropsChanged
| `Created
| `Unchanged ]
type replicaContent =
{ typ : Fileinfo.typ;
status : status;
desc : Props.t; (* Properties (for the UI) *)
ui : updateItem;
size : int * Uutil.Filesize.t; (* Number of items and size *)
props : Props.t list } (* Parent properties *)
type direction =
Conflict of string (* The string is the reason of the conflict *)
| Merge
| Replica1ToReplica2
| Replica2ToReplica1
let direction2string = function
Conflict _ -> "conflict"
| Merge -> "merge"
| Replica1ToReplica2 -> "replica1 to replica2"
| Replica2ToReplica1 -> "replica2 to replica1"
let isConflict = function
Conflict _ -> true
| _ -> false
type difference =
{ rc1 : replicaContent;
rc2 : replicaContent;
errors1 : string list;
errors2 : string list;
mutable direction : direction;
default_direction : direction }
type replicas =
Problem of string (* There was a problem during update detection *)
| Different of difference (* Replicas differ *)
type reconItem = {path1 : Path.t; path2 : Path.t; replicas : replicas}
let ucLength = function
File(desc,_) -> Props.length desc
| Dir(desc,_,_,_) -> Props.length desc
| _ -> Uutil.Filesize.zero
let uiLength = function
Updates(uc,_) -> ucLength uc
| _ -> Uutil.Filesize.zero
let riAction rc rc' =
match rc.status, rc'.status with
`Deleted, _ ->
`Delete
| (`Unchanged | `PropsChanged), (`Unchanged | `PropsChanged) ->
`SetProps
| _ ->
`Copy
let rcLength rc rc' =
if riAction rc rc' = `SetProps then
Uutil.Filesize.zero
else
snd rc.size
let riLength ri =
match ri.replicas with
Different {rc1 = {status= `Unchanged | `PropsChanged};
rc2 = {status= `Unchanged | `PropsChanged}} ->
Uutil.Filesize.zero (* No contents propagated *)
| Different {rc1 = rc1; rc2 = rc2; direction = dir} ->
begin match dir with
Replica1ToReplica2 -> rcLength rc1 rc2
| Replica2ToReplica1 -> rcLength rc2 rc1
| Conflict _ -> Uutil.Filesize.zero
| Merge -> Uutil.Filesize.zero (* underestimate :-*)
end
| _ ->
Uutil.Filesize.zero
let fileInfos ui1 ui2 =
match ui1, ui2 with
(Updates (File (desc1, ContentsUpdated (fp1, _, ress1)),
Previous (`FILE, desc2, fp2, ress2)),
NoUpdates)
| (Updates (File (desc1, ContentsUpdated (fp1, _, ress1)),
Previous (`FILE, desc2, fp2, ress2)),
Updates (File (_, ContentsSame), _))
| (NoUpdates,
Updates (File (desc2, ContentsUpdated (fp2, _, ress2)),
Previous (`FILE, desc1, fp1, ress1)))
| (Updates (File (_, ContentsSame), _),
Updates (File (desc2, ContentsUpdated (fp2, _, ress2)),
Previous (`FILE, desc1, fp1, ress1)))
| (Updates (File (desc1, ContentsUpdated (fp1, _, ress1)), _),
Updates (File (desc2, ContentsUpdated (fp2, _, ress2)), _)) ->
(desc1, fp1, ress1, desc2, fp2, ress2)
| _ ->
raise (Util.Transient "Can't diff")
let problematic ri =
match ri.replicas with
Problem _ -> true
| Different diff -> isConflict diff.direction
let partiallyProblematic ri =
match ri.replicas with
Problem _ ->
true
| Different diff ->
isConflict diff.direction || diff.errors1 <> [] || diff.errors2 <> []
let isDeletion ri =
match ri.replicas with
Different {rc1 = rc1; rc2 = rc2; direction = rDir} ->
(match rDir, rc1.typ, rc2.typ with
Replica1ToReplica2, `ABSENT, _ -> true
| Replica2ToReplica1, _, `ABSENT -> true
| _ -> false)
| _ -> false
let rcType rc = Fileinfo.type2string rc.typ
let riFileType ri =
match ri.replicas with
Different {rc1 = rc1; rc2 = rc2; default_direction = dir} ->
begin match dir with
Replica2ToReplica1 -> rcType rc2
| _ -> rcType rc1
end
| _ -> "nonexistent"
|
