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\subsection{darcs push}
\begin{code}
module Darcs.Commands.Push ( push ) where
import System.Exit ( exitWith, ExitCode( ExitSuccess, ExitFailure ) )
import Control.Monad ( when )
import Data.Char ( toUpper )
import Workaround ( getCurrentDirectory )
import Darcs.Commands ( DarcsCommand(..) )
import Darcs.Arguments ( DarcsFlag( DryRun, Verbose, Quiet, Sign, SignAs, NoSign, SignSSL ),
definePatches,
working_repo_dir, summary,
print_dry_run_message_and_exit,
applyas, match_several, fixUrl, deps_sel,
all_interactive, dry_run, nolinks,
remote_repo, network_options,
set_default, sign, allow_unrelated_repos
)
import Darcs.Hopefully ( hopefully )
import Darcs.Repository ( withRepoReadLock, ($-), identifyRepositoryFor, slurp_recorded,
read_repo, amInRepository, checkUnrelatedRepos )
import Darcs.Patch ( description )
import Darcs.Ordered ( RL(..), (:>)(..), (:\/:)(..),
nullFL, reverseRL, mapFL_FL, unsafeUnRL, mapRL, lengthRL )
import Darcs.Repository.Prefs ( defaultrepo, set_defaultrepo, get_preflist )
import Darcs.External ( maybeURLCmd, signString )
import Darcs.URL ( is_url, is_file )
import Darcs.SelectChanges ( with_selected_changes )
import Darcs.Utils ( formatPath )
import Darcs.Patch.Depends ( get_common_and_uncommon )
import Darcs.Patch.Bundle ( make_bundle )
import Printer ( vcat, empty, text, ($$), (<+>), putDocLn, errorDoc )
import Darcs.RemoteApply ( remote_apply, apply_as )
import Darcs.Email ( make_email )
import English (englishNum, Noun(..))
#include "impossible.h"
push_description :: String
push_description =
"Copy and apply patches from this repository to another one."
\end{code}
\options{push}
\haskell{push_help}
\begin{code}
push_help :: String
push_help =
"Push is the opposite of pull. Push allows you to copy changes from the\n"++
"current repository into another repository.\n"
push :: DarcsCommand
push = DarcsCommand {command_name = "push",
command_help = push_help,
command_description = push_description,
command_extra_args = 1,
command_extra_arg_help = ["[REPOSITORY]"],
command_command = push_cmd,
command_prereq = amInRepository,
command_get_arg_possibilities = get_preflist "repos",
command_argdefaults = defaultrepo,
command_advanced_options = [applyas,
nolinks,
remote_repo] ++
network_options,
command_basic_options = [match_several, deps_sel,
all_interactive,
sign]++dry_run++[summary,
working_repo_dir,
set_default,
allow_unrelated_repos]}
push_cmd :: [DarcsFlag] -> [String] -> IO ()
push_cmd opts [""] = push_cmd opts []
push_cmd opts [unfixedrepodir] =
let am_verbose = Verbose `elem` opts
am_quiet = Quiet `elem` opts
putVerbose s = when am_verbose $ putDocLn s
putInfo s = when (not am_quiet) $ putDocLn s
in
do
repodir <- fixUrl opts unfixedrepodir
here <- getCurrentDirectory
when (repodir == here) $
fail "Can't push to current repository!"
(bundle,num_to_pull) <- withRepoReadLock opts $- \repository -> do
if is_url repodir then do
when (apply_as opts /= Nothing) $
let msg = text "Cannot --apply-as when pushing to URLs" in
if DryRun `elem` opts
then putInfo $ text "NOTE: " <+> msg
$$ text ""
else errorDoc msg
maybeapply <- maybeURLCmd "APPLY" repodir
when (maybeapply == Nothing) $
let lprot = takeWhile (/= ':') repodir
prot = map toUpper lprot
msg = text ("Pushing to "++lprot++" URLs is not supported.\n"++
"You may be able to hack this to work"++
" using DARCS_APPLY_"++prot) in
if DryRun `elem` opts
then putInfo $ text "NOTE:" <+> msg
$$ text ""
else errorDoc msg
else do
when (want_sign opts) $
let msg = text "Signing doesn't make sense for local repositories or when pushing over ssh."
in if DryRun `elem` opts
then putInfo $ text "NOTE:" <+> msg
else errorDoc msg
them <- identifyRepositoryFor repository repodir >>= read_repo
old_default <- get_preflist "defaultrepo"
set_defaultrepo repodir opts
when (old_default == [repodir]) $
let pushing = if DryRun `elem` opts then "Would push" else "Pushing"
in putInfo $ text $ pushing++" to "++formatPath repodir++"..."
us <- read_repo repository
case get_common_and_uncommon (us, them) of
(common, us' :\/: them') -> do
checkUnrelatedRepos opts common us them
putVerbose $ text "We have the following patches to push:"
$$ (vcat $ mapRL description $ head $ unsafeUnRL us')
firstUs <- case us' of
NilRL:<:NilRL -> do putInfo $ text "No recorded local changes to push!"
exitWith ExitSuccess
NilRL -> bug "push_cmd: us' is empty!"
(x:<:_) -> return x
s <- slurp_recorded repository
with_selected_changes "push" opts s (reverseRL firstUs) $
\ (to_be_pushed:>_) -> do
definePatches to_be_pushed
print_dry_run_message_and_exit "push" opts to_be_pushed
when (nullFL to_be_pushed) $ do
putInfo $
text "You don't want to push any patches, and that's fine with me!"
exitWith ExitSuccess
let num_to_pull = lengthRL $ head $ unsafeUnRL them'
bundle = make_bundle []
(bug "using slurpy in make_bundle called from Push")
common (mapFL_FL hopefully to_be_pushed)
return (bundle, num_to_pull)
sbundle <- signString opts bundle
let body = if is_file repodir
then sbundle
else make_email repodir [] Nothing sbundle Nothing
rval <- remote_apply opts repodir body
let pull_reminder =
if num_to_pull > 0
then text $ "(By the way, the remote repository has " ++ show num_to_pull ++ " "
++ englishNum num_to_pull (Noun "patch") " to pull.)"
else empty
case rval of ExitFailure ec -> do putStrLn $ "Apply failed!"
exitWith (ExitFailure ec)
ExitSuccess -> putInfo $ text "Push successful." $$ pull_reminder
push_cmd _ _ = impossible
want_sign :: [DarcsFlag] -> Bool
want_sign opts = case opts of
[] -> False
Sign:_ -> True
(SignAs _):_ -> True
(SignSSL _):_ -> True
NoSign:_ -> False
_:opts' -> want_sign opts'
\end{code}
For obvious reasons, you can only push to repositories to which you have
write access. In addition, you can only push to repos that you access
either on the local file system or with ssh. In order to apply with ssh,
darcs must also be installed on the remote computer. The command invoked
to run ssh may be configured by the \verb!DARCS_SSH! environment variable
(see subsection~\ref{env:DARCS_SSH}). The command invoked via ssh is always
\verb!darcs!, i.e.\ the darcs executable must be in the default path on
the remote machine.
Push works by creating a patch bundle, and then running darcs apply in the
target repository using that patch bundle. This means that the default
options for \emph{apply} in the \emph{target} repository (such as, for
example, \verb!--test!) will affect the behavior of push. This also means
that push is somewhat less efficient than pull.
When you receive an error message such as
\begin{verbatim}
bash: darcs: command not found
\end{verbatim}
then this means that the darcs on the remote machine could
not be started. Make sure that the darcs executable is called
\verb!darcs! and is found in the default path. The default path can
be different in interactive and in noninteractive shells. Say
\begin{verbatim}
ssh login@remote.machine darcs
\end{verbatim}
to try whether the remote darcs can be found, or
\begin{verbatim}
ssh login@remote.machine 'echo $PATH'
\end{verbatim}
(note the single quotes) to check the default path.
\begin{options}
--apply-as
\end{options}
If you give the \verb!--applyas! flag, darcs will use sudo to apply the
changes as a different user. This can be useful if you want to set up a
system where several users can modify the same repository, but you don't
want to allow them full write access. This isn't secure against skilled
malicious attackers, but at least can protect your repository from clumsy,
inept or lazy users.
\begin{options}
\end{options}
The \verb!--patches!, \verb!--matches!, \verb!--tags!, and \verb!--nodeps!
options can be used to select which patches to push, as described in
subsection~\ref{selecting}.
When there are conflicts, the behavior of push is determined by the default
flags to \verb!apply! in the \emph{target} repository. Most commonly, for
pushedto repositories, you'd like to have \verb!--dontallowconflicts! as
a default option to apply (by default, it is already the default\ldots). If
this is the case, when there are conflicts on push, darcs will fail with an
error message. You can then resolve by pulling the conflicting patch,
recording a resolution and then pushing the resolution together with the
conflicting patch.
Darcs does not have an explicit way to tell you which patch conflicted, only the
file name. You may want to pull all the patches from the remote repository just
to be sure. If you don't want to do this in your working directory,
you can create another darcs working directory for this purpose.
If you want, you could set the target repository to use \verb!--allowconflicts!.
In this case conflicting patches will be applied, but the conflicts will
not be marked in the working directory.
If, on the other hand, you have \verb!--markconflicts! specified as a
default flag for apply in the target repository, when there is a conflict,
it will be marked in the working directory of the target repository. In
this case, you should resolve the conflict in the target repository itself.