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|
{- git-annex command
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Map where
import Control.Monad.State (liftIO)
import Control.Exception.Extensible
import System.Cmd.Utils
import qualified Data.Map as M
import Data.List.Utils
import Command
import qualified Annex
import qualified GitRepo as Git
import qualified Remotes
import Messages
import Types
import Utility
import UUID
import qualified Dot
-- a link from the first repository to the second (its remote)
data Link = Link Git.Repo Git.Repo
command :: [Command]
command = [Command "map" paramNothing seek "generate map of repositories"]
seek :: [CommandSeek]
seek = [withNothing start]
start :: CommandStartNothing
start = do
g <- Annex.gitRepo
rs <- spider g
umap <- uuidMap
liftIO $ writeFile file (drawMap rs umap)
showLongNote $ "running: dot -Tx11 " ++ file
showProgress
r <- liftIO $ boolSystem "dot" ["-Tx11", file]
return $ Just $ return $ Just $ return r
where
file = "map.dot"
{- Generates a graph for dot(1). Each repository, and any other uuids, are
- displayed as a node, and each of its remotes is represented as an edge
- pointing at the node for the remote. -}
drawMap :: [Git.Repo] -> (M.Map UUID String) -> String
drawMap rs umap = Dot.graph $ repos ++ others
where
repos = map (node umap rs) rs
others = map uuidnode (M.keys umap)
uuidnode u = Dot.graphNode u $ M.findWithDefault "" u umap
hostname :: Git.Repo -> String
hostname r
| Git.repoIsUrl r = Git.urlHost r
| otherwise = "localhost"
basehostname :: Git.Repo -> String
basehostname r = head $ split "." $ hostname r
{- A name to display for a repo. Uses the name from uuid.log if available,
- or the remote name if not. -}
repoName :: (M.Map UUID String) -> Git.Repo -> String
repoName umap r
| null repouuid = fallback
| otherwise = M.findWithDefault fallback repouuid umap
where
repouuid = getUncachedUUID r
fallback =
case (Git.repoRemoteName r) of
Just n -> n
Nothing -> "unknown"
{- A unique id for the node. Uses the annex.uuid if available. -}
nodeId :: Git.Repo -> String
nodeId r =
case (getUncachedUUID r) of
"" -> Git.repoLocation r
u -> u
{- A node representing a repo. -}
node :: (M.Map UUID String) -> [Git.Repo] -> Git.Repo -> String
node umap fullinfo r = unlines $ n:edges
where
n = Dot.subGraph (hostname r) (basehostname r) $
Dot.graphNode (nodeId r) (repoName umap r)
edges = map (edge umap fullinfo r) (Git.remotes r)
{- An edge between two repos. The second repo is a remote of the first. -}
edge :: (M.Map UUID String) -> [Git.Repo] -> Git.Repo -> Git.Repo -> String
edge umap fullinfo from to =
Dot.graphEdge (nodeId from) (nodeId $ makeabs from fullto) edgename
where
-- get the full info for the remote, to get its UUID
fullto = findfullinfo to
findfullinfo n =
case (filter (same n) fullinfo) of
[] -> n
(n':_) -> n'
{- Only name an edge if the name is different than the name
- that will be used for the destination node, and is
- different from its hostname. (This reduces visual clutter.) -}
edgename =
case (Git.repoRemoteName to) of
Nothing -> Nothing
Just n ->
if (n == repoName umap fullto || n == hostname fullto)
then Nothing
else Just n
{- Recursively searches out remotes starting with the specified repo. -}
spider :: Git.Repo -> Annex [Git.Repo]
spider r = spider' [r] []
spider' :: [Git.Repo] -> [Git.Repo] -> Annex [Git.Repo]
spider' [] known = return known
spider' (r:rs) known
| any (same r) known = spider' rs known
| otherwise = do
r' <- scan r
let remotes = map (makeabs r') (Git.remotes r')
spider' (rs ++ remotes) (r':known)
{- Makes a remote have an absolute url, rather than a host-local path. -}
makeabs :: Git.Repo -> Git.Repo -> Git.Repo
makeabs repo remote
| Git.repoIsUrl remote = remote
| not $ Git.repoIsUrl repo = remote
| otherwise = Git.repoFromUrl combinedurl
where
combinedurl =
Git.urlScheme repo ++ "//" ++
Git.urlHostFull repo ++
Git.workTree remote
{- Checks if two repos are the same. -}
same :: Git.Repo -> Git.Repo -> Bool
same a b
| both Git.repoIsSsh = matching Git.urlHostFull && matching Git.workTree
| both Git.repoIsUrl && neither Git.repoIsSsh = matching show
| otherwise = False
where
matching t = t a == t b
both t = t a && t b
neither t = not (t a) && not (t b)
{- reads the config of a remote, with progress display -}
scan :: Git.Repo -> Annex Git.Repo
scan r = do
showStart "map" $ Git.repoDescribe r
v <- tryScan r
case v of
Just r' -> do
showEndOk
return r'
Nothing -> do
showEndFail
return r
{- tries to read the config of a remote, returning it only if it can
- be accessed -}
tryScan :: Git.Repo -> Annex (Maybe Git.Repo)
tryScan r
| Git.repoIsSsh r = sshscan
| Git.repoIsUrl r = return Nothing
| otherwise = safely $ Git.configRead r
where
safely a = do
result <- liftIO (try (a)::IO (Either SomeException Git.Repo))
case result of
Left _ -> return Nothing
Right r' -> return $ Just r'
pipedconfig cmd params = safely $
pOpen ReadFromPipe cmd params $
Git.hConfigRead r
configlist =
Remotes.onRemote r (pipedconfig, Nothing) "configlist" []
manualconfiglist = do
sshoptions <- Remotes.repoConfig r "ssh-options" ""
let sshcmd =
"cd " ++ shellEscape(Git.workTree r) ++ " && " ++
"git config --list"
liftIO $ pipedconfig "ssh" $
words sshoptions ++ [Git.urlHostFull r, sshcmd]
-- First, try sshing and running git config manually,
-- only fall back to git-annex-shell configlist if that
-- fails.
--
-- This is done for two reasons, first I'd like this
-- subcommand to be usable on non-git-annex repos.
-- Secondly, configlist doesn't include information about
-- the remote's remotes.
sshscan = do
showNote "sshing..."
showProgress
v <- manualconfiglist
case v of
Nothing -> configlist
ok -> return ok
|
