diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,3 @@
+# Changelog for pi-hoole
+
+## Unreleased changes
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+     GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero 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 Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
new file mode 100644
--- /dev/null
+++ b/README.md
@@ -0,0 +1,177 @@
+# pi-hoole
+
+`pi-hoole` is a collection of tools to enforce access control for self-hosted
+pijul repositories. It can be seen as a cgit-like solution, for authenticated
+(public key, SSH) and anonymous accesses. You can grant read and write accesses
+to a whole repository, or to a determined subset of branches.
+
+`pi-hoole` is distributed under the terms of the AGPL v3.
+
+## Getting Started
+
+### Building From Source
+
+It should not be a surprise that `pi-hoole` is versioned under `pijul`, with the
+patch format introduced by `pijul-0.9`. Fair warning, use `pijul-0.10.1` and you
+should be able to clone the `pi-hoole` repository.
+
+```bash
+pijul clone https://pijul.lthms.xyz/pijul/pi-hoole
+```
+
+Under the hood, `pi-hoole` is implemented in Haskell. We will need `stack` to
+build it.
+
+```bash
+cd pi-hoole
+stack build
+```
+
+We are using the latest lts available, but `pi-hoole` has already been built
+with `lts-10` (but does not build with older ones).
+
+This build three executables:
+
+* `pi-hoole-cfg` generates a `.authorized_keys` file to enforce access control
+  for SSH.
+* `pi-hoole-shell` is called to determine if a authenticated user is allowed to
+  perform a given `pijul` command.
+* `pi-hoole-web` is a HTTP proxy to enforce access control for anonymous
+  requests.
+
+### Installing
+
+In order to use `pi-hoole` on your server, the first step is to create a new,
+dedicated user (*e.g.* `pijul`). You then need to make `pijul` and
+`pi-hoole-shell` available to this user. Currently, we do not provide any
+packaging solution to that end, but this might change in the future. Although it
+is not mandatory, we consider both `pi-hoole-cfg` and `pi-hoole-web` have also
+been made available for the `pijul` user.
+
+### Configuring
+
+`pi-hoole` executables assume the configuration files are stored at
+`${XDG_CONFIG_DIRECTORY}/pi-hoole`, that is `~/.config/pi-hoole` by default.
+
+In this directory, `pi-hoole` will scan the `keys/` directory, if it exists,
+to know the list of authorized authenticated users. One user may have as many
+public key as required. Keys should be saved in file with the following filename
+scheme: `<user>(\.<label>)?\.pub`. Thus, `lthms.pub`, `lthms.laptop.pub` and
+`lthms.work.pub` are three valid public key filenames for the `lthms` user.
+
+To generate a `.ssh/authorized_keys`, use `pi-hoole-cfg`.
+
+```bash
+pi-hoole-cfg generate > ~/.ssh/authorized_keys
+```
+
+Resulting file will be of the forms:
+
+    command="pi-hoole-shell \".lthms\" \"${SSH_ORIGINAL_COMMAND}\"",no-port-forwarding,no-x11-forwarding,no-agent-forwarding <ssh_keys_1>
+    command="pi-hoole-shell \".lthms\" \"${SSH_ORIGINAL_COMMAND}\"",no-port-forwarding,no-x11-forwarding,no-agent-forwarding <ssh_keys_2>
+
+To configure the authorized accesses for the users, you have to set up a valid
+`pi-hoole` configuration file. The latter uses the YAML syntax, and is located
+at `${XDG_CONFIG_DIRECTORY}/pi-hoole/config.yaml`.  It has two root fields:
+`groups` and `repositories`.
+
+You can define groups of users, and grant certain rights to a group, effectively
+granting there rights to each users who are member of the group.
+
+Group names are prefixed by `+`, and user names are prefixed by `.`.
+
+Then, if you want to create one group `ogma` which contains the users `lgeorget`
+and `lthms`:
+
+    groups:
+      +ogma: [.lthms, .lgeorget]
+
+You can create as many groups as you want, and one user may be added to several
+groups. Currently, nested groups are not allowed (*i.e.* a group being member of
+another group).
+
+The `repositories` field allows for defining which repositories are available, and
+what given users can do with these repositories. The contents of the
+`repositories` is a map, where keys are `path` to the repositories (relative to
+`HOME` directory), and values are maps from role to rights.
+
+For instance, given the following configuration:
+
+    repositories:
+      my/first/repo:
+        .lthms: +w
+        +contrib: +r +w[master]
+        anon: +r
+
+      my/second/repo:
+        .lthms: +r
+        .lgeorget: +w
+
+We declare two repositories, one located at `${HOME}/my/first/repo`, and another
+at `${HOME}/my/second/repo`. The user `lthms` (identified with `.lthms`) can
+read and write to this repository, to arbitrary branches. The members of the
+group `contrib` can read to any branch, but can only write to the `master`
+branch. Finally, the anonymous user (through HTTP), can read to any branch.
+
+Read means being able to clone or pull. Write means being able to push.
+
+For the second repository, `lthms` can read to any branch, when `lgeorget` can
+read and write to any branch. Therefore, it is not possible to clone
+`my/second/repo` through HTTP, because `anon` has not been granted any
+particular rights.
+
+### Setting Up HTTP Proxy
+
+`pi-hoole-web` is a very simple HTTP proxy. It receives HTTP request, ideally
+issued by a `pijul` client, and turns them into `pijul` commands if the `anon`
+role has been granted the required rights.
+
+Currently, `pi-hoole-web` cannot be configured, and listen the port 8080. Also,
+it does not daemonify itself. The easiest way to set up a `pi-hoole-web`
+instance in a reliable way is to use systemd, for instance with the following
+unit:
+
+```
+[Unit]
+Description=HTTP Proxy for Pijul anonymous accesses
+
+[Service]
+Type=simple
+User=pijul
+Group=pijul
+ExecStart=/usr/bin/pi-hoole-web
+Restart=of-failure
+TimeoutStopSec=300
+
+[Install]
+WantedBy=multi-user.target
+```
+
+For reference, the instance of `pi-hoole-web` responsible for `pijul.lthms.xyz`
+is behind a nginx server. One very straightforward nginx configuration can be:
+
+```
+server {
+  listen 80;
+  server_name pijul.lthms.xyz;
+
+  access_log /var/log/nginx/pijul.lthms.xyz.access.log;
+  error_log /var/log/nginx/pijul.lthms.xyz.error.log;
+
+  location / {
+    proxy_pass http://localhost:8080/;
+  }
+}
+```
+
+## Limitations
+
+### Private Branches
+
+The command `pijul patch` does not have an argument to specify the branch from
+which a patch is initially fetched; as a consequence, having read access to a
+repo, even for another branch where the patch is not applied, is enough.  For
+this reason, if a user who obtains a hash for a patch of a branch they cannot
+access can fetch the patch. That is, a patch is as private as its hash. Private
+branches will eventually be supported in a better manner, but for now, private
+branches should mean separated repositories.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/app/cfg/Main.hs b/app/cfg/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/cfg/Main.hs
@@ -0,0 +1,135 @@
+--  pi-hoole: lightweight access-control for pijul
+--  Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>
+--
+--  This program is free software: you can redistribute it and/or modify
+--  it under the terms of the GNU Affero 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 Affero General Public License for more details.
+--
+--  You should have received a copy of the GNU Affero General Public License
+--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE DeriveGeneric     #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Main where
+
+import           Control.Monad      (filterM)
+import           Data.List          (partition)
+import           Data.Map.Strict    (Map)
+import qualified Data.Map.Strict    as M (adjustWithKey, empty, foldl, insert,
+                                          insertWith, member, toList)
+import           Data.Maybe         (isJust)
+import           Data.Set           (Set)
+import qualified Data.Set           as S (foldl, singleton, toList, union)
+import           Data.Text          (Text, append)
+import qualified Data.Text          as T (pack, strip, unpack)
+import qualified Data.Text.IO       as T (putStrLn, readFile)
+import           Data.Yaml          (decodeFile)
+import           GHC.Generics       (Generic)
+import           Options.Generic    (ParseRecord, getRecord)
+import           PiHoole            (Configuration, UserName (..))
+import           System.Directory   (XdgDirectory (..), doesFileExist,
+                                     getXdgDirectory, listDirectory)
+import           System.Environment (lookupEnv)
+import           System.FilePath    (takeFileName, (</>))
+import           System.IO          (hPutStrLn, stderr)
+import           Text.Regex.PCRE    ((=~))
+
+-------------------------------------------------------------------------------
+data CLI = Generate (Maybe FilePath)
+         | License
+  deriving (Generic, Show)
+
+instance ParseRecord CLI
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+main :: IO ()
+main = getRecord "pi-hoole-cfg" >>= piHooleCfg
+
+  where
+    piHooleCfg License = putStrLn license
+
+    piHooleCfg (Generate mdir) = do
+      dir <- getKeysDir mdir
+      (keys, discarded) <- splitCandidates <$> getPotentialKeys dir
+
+      warn discarded
+
+      generateAuthorizedKeys $ organize keys
+
+
+    warn (fp:rst) = do
+      hPutStrLn stderr $ fp ++ ": not a correct key name"
+      warn rst
+    warn _ = pure ()
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+generateAuthorizedKeys :: Map UserName (Set FilePath) -> IO ()
+generateAuthorizedKeys map = mapM_ (uncurry aux) (M.toList map)
+  where
+    aux user set = mapM_ (authorization user) (S.toList set)
+
+    authorization :: UserName -> FilePath -> IO ()
+    authorization (UserName user) fp = do
+      key <- T.strip <$> T.readFile fp
+      T.putStrLn $ cmd  user `append` "," `append` options `append` " " `append` key
+
+    options = "no-port-forwarding,no-x11-forwarding,no-agent-forwarding"
+    cmd user = "command=\"pi-hoole-shell \\\"." `append` user `append` "\\\" \\\"${SSH_ORIGINAL_COMMAND}\\\"\""
+
+organize :: [FilePath] -> Map UserName (Set FilePath)
+organize = foldl aux M.empty
+  where
+    aux m fp =
+      case keyOwner $ takeFileName fp of
+        Just user -> M.insertWith S.union user (S.singleton fp) m
+        _         -> m
+
+getKeysDir :: Maybe FilePath -> IO FilePath
+getKeysDir (Just dir) = pure dir
+getKeysDir _          = getXdgDirectory XdgConfig "pi-hoole/keys"
+
+isKey :: FilePath -> Bool
+isKey = isJust . keyOwner . takeFileName
+
+getPotentialKeys :: FilePath -> IO [FilePath]
+getPotentialKeys dir = fmap (dir </>) <$> listDirectory dir
+  >>= filterM doesFileExist
+
+keyOwner :: FilePath -> Maybe UserName
+keyOwner key = case key =~ regex of
+  [[_, name, _]] -> Just (UserName $ T.pack name)
+  _              -> Nothing
+  where
+    regex :: String
+    regex = "^([a-zA-Z]*)(\\.[a-zA-Z]+)?\\.pub$"
+
+splitCandidates :: [FilePath] -> ([FilePath], [FilePath])
+splitCandidates = partition isKey
+
+license :: String
+license =
+  unlines [ "Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>"
+          , ""
+          , "This program is free software: you can redistribute it and/or modify"
+          , "it under the terms of the GNU Affero 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 Affero General Public License for more details."
+          , ""
+          , "You should have received a copy of the GNU Affero General Public License"
+          , "along with this program.  If not, see <http://www.gnu.org/licenses/>."
+          ]
+-------------------------------------------------------------------------------
diff --git a/app/shell/Main.hs b/app/shell/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/shell/Main.hs
@@ -0,0 +1,87 @@
+--  pi-hoole: lightweight access-control for pijul
+--  Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>
+--
+--  This program is free software: you can redistribute it and/or modify
+--  it under the terms of the GNU Affero 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 Affero General Public License for more details.
+--
+--  You should have received a copy of the GNU Affero General Public License
+--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE LambdaCase        #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Main where
+
+import           Data.Map.Strict    (Map)
+import qualified Data.Map.Strict    as M (fromList)
+import           Data.Set           (Set)
+import qualified Data.Set           as S (fromList)
+import           Data.Text          (Text, append, pack, unpack)
+import qualified Data.Text.IO       as T (getLine)
+import           Data.Void          (Void)
+import           Data.Yaml          (decodeFile)
+import           PiHoole
+import           System.Directory   (XdgDirectory (..), getXdgDirectory)
+import           System.Environment (getArgs)
+import           Text.Megaparsec    (parseTest)
+
+-------------------------------------------------------------------------------
+main :: IO ()
+main = getArgs >>= \case
+  [ "--license" ] ->
+    putStrLn license
+  [ user, "" ] ->
+    putStrLn $ "connected as " ++ user
+  [ user, cmd ] ->
+    getConfiguration >>= \case
+    Just cfg ->
+      case (parseUserName (pack user), parsePijul (pack cmd)) of
+        (Just user, Just cmd) ->
+          pijulProxy cfg user cmd
+        (Nothing, _) ->
+          putStrLn $ user ++ " is not a valid role"
+        (_, Nothing) ->
+          putStrLn $ cmd ++ " is not a valid pijul command"
+    Nothing ->
+      putStrLn "could not parse the configuration file"
+  _ ->
+    putStrLn "incorrect shell command"
+-------------------------------------------------------------------------------
+
+-------------------------------------------------------------------------------
+getConfiguration :: IO (Maybe Configuration)
+getConfiguration = getXdgDirectory XdgConfig "pi-hoole/config.yaml" >>= decodeFile
+
+decodeLimes :: FilePath -> IO (Maybe Configuration)
+decodeLimes = decodeFile
+
+pijulProxy :: Configuration -> UserName -> Pijul -> IO ()
+pijulProxy cfg user cmd
+  | checkPrivilege user cmd cfg =  callPijul cmd
+  | otherwise = putStrLn "nah"
+
+license :: String
+license =
+  unlines [ "Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>"
+          , ""
+          , "This program is free software: you can redistribute it and/or modify"
+          , "it under the terms of the GNU Affero 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 Affero General Public License for more details."
+          , ""
+          , "You should have received a copy of the GNU Affero General Public License"
+          , "along with this program.  If not, see <http://www.gnu.org/licenses/>."
+          ]
+-------------------------------------------------------------------------------
diff --git a/app/web/Main.hs b/app/web/Main.hs
new file mode 100644
--- /dev/null
+++ b/app/web/Main.hs
@@ -0,0 +1,106 @@
+--  pi-hoole: lightweight access-control for pijul
+--  Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>
+--
+--  This program is free software: you can redistribute it and/or modify
+--  it under the terms of the GNU Affero 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 Affero General Public License for more details.
+--
+--  You should have received a copy of the GNU Affero General Public License
+--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE LambdaCase        #-}
+{-# LANGUAGE OverloadedStrings #-}
+
+module Main where
+
+import           Control.Applicative       ((<|>))
+import           Data.ByteString.Base58    (bitcoinAlphabet, decodeBase58)
+import           Data.Map.Strict           (Map, (!?))
+import           Data.Maybe                (fromJust, maybe)
+import           Data.String               (fromString)
+import           Data.Text                 (Text, pack, unpack)
+import           Data.Text.Encoding        (decodeUtf8)
+import           Data.Yaml                 (decodeFile)
+import           Network.HTTP.Types.Method (methodGet)
+import           Network.HTTP.Types.Status (status200, status404)
+import           Network.Wai               (Application, Request, pathInfo,
+                                            requestMethod, responseLBS)
+import           Network.Wai.Handler.Warp  (run)
+import           PiHoole                   (Action (Log, Patch), Branch (..),
+                                            Configuration (repositories),
+                                            Pijul (..), Privilege, Repo (..),
+                                            Role (Anon), privilegeLe,
+                                            recordPijul, requires)
+import           System.Directory          (XdgDirectory (..), getXdgDirectory)
+import           System.FilePath           (FilePath, (</>))
+import           Text.Regex.PCRE           ((=~))
+
+main :: IO ()
+main = getConfiguration >>= \case
+  Just cfg -> run 8080 (piHooleWeb $ repositories cfg)
+  Nothing -> putStrLn "Could not open or parse the configuration file"
+
+  where piHooleWeb :: Map Repo (Map Role Privilege) -> Application
+        piHooleWeb cfg req respond =
+          let action = requestToPijul req in
+          if maybe False (pijulToPrivileges cfg) action
+          then do res <- recordPijul (fromJust action)
+                  respond $ responseLBS status200 [] (fromString res)
+          else do print req
+                  respond $ responseLBS status404 [] "Sorry"
+
+pijulToPrivileges :: Map Repo (Map Role Privilege) -> Pijul -> Bool
+pijulToPrivileges cfg (Pijul repo action) =
+  case cfg !? repo >>= (!? Anon) of
+    Just priv -> requires action `privilegeLe` priv
+    _         -> False
+
+requestToPijul :: Request -> Maybe Pijul
+requestToPijul req
+  | isGet req = let path = pathInfo req
+                in log path <|> patch path
+  | otherwise = Nothing
+  where
+    log :: [Text] -> Maybe Pijul
+    log = logAux ""
+
+    logAux :: FilePath -> [Text] -> Maybe Pijul
+    logAux path [".pijul", branch] = Pijul (Repo path) <$> (Log <$> parseBranch branch)
+    logAux path (x:rst)  = logAux (path </> unpack x) rst
+    logAux _ _ = Nothing
+
+    parseBranch :: Text -> Maybe Branch
+    parseBranch branch = case unpack branch =~ changesRegex of
+      [[_, branch58]] -> Branch . decodeUtf8 <$> decodeBase58 bitcoinAlphabet (fromString branch58)
+      _               -> Nothing
+
+    changesRegex :: String
+    changesRegex = "changes\\.(.*)$"
+
+    patch :: [Text] -> Maybe Pijul
+    patch = patchAux ""
+
+    patchAux :: FilePath -> [Text] -> Maybe Pijul
+    patchAux path [".pijul", "patches", patch] = Pijul (Repo path) <$> (Patch <$> parsePatch patch)
+    patchAux path (x:rst)  = patchAux (path </> unpack x) rst
+    patchAux _ _ = Nothing
+
+    parsePatch :: Text -> Maybe Text
+    parsePatch patch = case unpack patch =~ patchRegex of
+      [[_, patch]] -> Just $ pack patch
+      _            -> Nothing
+
+    patchRegex :: String
+    patchRegex = "(.*)\\.gz"
+
+    isGet :: Request -> Bool
+    isGet = (== methodGet) . requestMethod
+
+getConfiguration :: IO (Maybe Configuration)
+getConfiguration = getXdgDirectory XdgConfig "pi-hoole/config.yaml" >>= decodeFile
diff --git a/pi-hoole.cabal b/pi-hoole.cabal
new file mode 100644
--- /dev/null
+++ b/pi-hoole.cabal
@@ -0,0 +1,94 @@
+name:           pi-hoole
+version:        0.1.0.0
+synopsis:       Lightweight access control solution for the pijul vcs
+description:    Please see the introductory post at <https://lthms.xyz/blog/pi-hoole>
+category:       Security
+author:         Thomas Letan
+maintainer:     lthms <contact@thomasletan.fr>
+copyright:      2018 Thomas Letan
+license:        AGPL-3
+license-file:   LICENSE
+build-type:     Simple
+cabal-version:  >= 1.10
+
+extra-source-files:
+    ChangeLog.md
+    README.md
+
+library
+  exposed-modules:  PiHoole
+  hs-source-dirs:   src
+  build-depends:    aeson              >=1.0   && <1.4
+                  , base               >=4.7   && <5.0
+                  , containers         >=0.5.9 && <0.6
+                  , directory          >=1.2   && <1.4
+                  , filepath           >=1.4   && <1.5
+                  , megaparsec         >=5.0   && <6.6
+                  , process            >=1.0   && <1.7
+                  , text               >=1.0   && <1.3
+  default-language: Haskell2010
+
+executable pi-hoole-cfg
+  main-is:          Main.hs
+  hs-source-dirs:   app/cfg
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
+  build-depends:    aeson              >=1.0   && <1.4
+                  , base               >=4.7   && <5
+                  , containers         >=0.5.9 && <0.6
+                  , directory          >=1.2   && <1.4
+                  , filepath           >=1.4   && <1.5
+                  , optparse-generic   >=1.0   && <1.4
+                  , pi-hoole
+                  , regex-pcre         >=0.91  && <0.95
+                  , text               >=1.0   && <1.3
+                  , unix               >=2.0   && <2.8
+                  , yaml               >=0.8   && <0.9
+  default-language: Haskell2010
+
+executable pi-hoole-shell
+  main-is:          Main.hs
+  hs-source-dirs:   app/shell
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
+  build-depends:    aeson              >=1.0   && <1.4
+                  , base               >=4.7   && <5
+                  , containers         >=0.5.9 && <0.6
+                  , directory          >=1.2   && <1.4
+                  , filepath           >=1.4   && <1.5
+                  , megaparsec         >=5.0   && <6.6
+                  , pi-hoole
+                  , text               >=1.0   && <1.3
+                  , yaml               >=0.8   && <0.9
+  default-language: Haskell2010
+
+executable pi-hoole-web
+  main-is:          Main.hs
+  hs-source-dirs:   app/web
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
+  build-depends:    aeson              >=1.0   && <1.4
+                  , base               >=4.7   && <5
+                  , base58-bytestring  >=0.1   && <0.2
+                  , bytestring         >=0.10  && <0.11
+                  , containers         >=0.5.9 && <0.6
+                  , directory          >=1.2   && <1.4
+                  , filepath           >=1.4   && <1.5
+                  , http-types         >=0.9   && <0.13
+                  , pi-hoole
+                  , regex-pcre         >=0.91  && <0.95
+                  , text               >=1.0   && <1.3
+                  , wai                >=3.0   && <3.3
+                  , warp               >=3.0   && <3.3
+                  , yaml               >=0.8   && <0.9
+  default-language: Haskell2010
+
+test-suite pi-hoole-test
+  type:             exitcode-stdio-1.0
+  main-is:          Spec.hs
+  hs-source-dirs:   test
+  ghc-options:      -threaded -rtsopts -with-rtsopts=-N
+  build-depends:    base >=4.7 && <5
+                  , pi-hoole
+  default-language: Haskell2010
+
+source-repository head
+  type:             pijul
+  location:         https://pijul.lthms.xyz/pijul/pi-hoole
diff --git a/src/PiHoole.hs b/src/PiHoole.hs
new file mode 100644
--- /dev/null
+++ b/src/PiHoole.hs
@@ -0,0 +1,374 @@
+--  pi-hoole: lightweight access-control for pijul
+--  Copyright (C) 2018 Thomas Letan <contact@thomasletan.fr>
+--
+--  This program is free software: you can redistribute it and/or modify
+--  it under the terms of the GNU Affero 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 Affero General Public License for more details.
+--
+--  You should have received a copy of the GNU Affero General Public License
+--  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+{-# LANGUAGE DeriveGeneric              #-}
+{-# LANGUAGE GeneralizedNewtypeDeriving #-}
+{-# LANGUAGE OverloadedStrings          #-}
+
+module PiHoole
+  ( Repo(..)
+  , Branch(..)
+  , Role(..)
+  , UserName(..)
+  , parseUserName
+  , GroupName(..)
+  , parseGroupName
+  , Configuration(..)
+  , Pijul(..)
+  , Action(..)
+  , parsePijul
+  , Privilege(..)
+  , privilegeLe
+  , requires
+  , checkPrivilege
+  , callPijul
+  , recordPijul
+  ) where
+
+import           Control.Applicative  ((<|>))
+import           Control.Monad        (void)
+import           Data.Aeson           (FromJSON (..), FromJSONKey (..),
+                                       ToJSON (..), ToJSONKey (..), Value (..),
+                                       decodeStrict)
+import           Data.Aeson.Types     (FromJSONKeyFunction (..), Parser,
+                                       toJSONKeyText)
+import           Data.Map.Strict      (Map, (!?))
+import qualified Data.Map.Strict      as M (foldlWithKey)
+import           Data.Maybe           (maybe)
+import           Data.Set             (Set)
+import qualified Data.Set             as S (empty, foldl, fromList, insert,
+                                            isSubsetOf, member, toList)
+import           Data.String          (IsString (..))
+import           Data.Text            (Text, append, pack, unpack)
+import qualified Data.Text            as T (drop, intercalate, take, uncons,
+                                            words)
+import qualified Data.Text.Encoding   as T (encodeUtf8)
+import           Data.Void            (Void)
+import           GHC.Generics         (Generic)
+import           System.Directory     (getHomeDirectory)
+import           System.FilePath      (isRelative)
+import           System.IO            (hGetContents)
+import           System.Process       (callProcess, createPipe, runProcess)
+import           Text.Megaparsec      (Parsec, eof, many, manyTill, parseMaybe,
+                                       some, takeP)
+import           Text.Megaparsec.Char (anyChar, char, oneOf, space, space1,
+                                       string)
+
+newtype Branch = Branch { unBranch :: Text}
+  deriving (Eq, Ord, Show, Generic, IsString, ToJSON, FromJSON)
+
+newtype Repo = Repo FilePath
+  deriving (Eq, Ord, Show, Generic, IsString, ToJSON)
+
+textToRepo :: String -> Parser Repo
+textToRepo txt = if isRelative txt
+                 then pure (Repo txt)
+                 else fail "repo path has to be relative"
+
+instance FromJSON Repo where
+  parseJSON (String txt) = textToRepo (unpack txt)
+
+instance FromJSONKey Repo where
+  fromJSONKey = FromJSONKeyTextParser (textToRepo . unpack)
+
+newtype UserName = UserName Text
+  deriving (Eq, Ord, Show, IsString)
+
+aesonMaybe :: String -> Maybe a -> Parser a
+aesonMaybe _ (Just x)    = pure x
+aesonMaybe error Nothing = fail error
+
+parsePrefix :: Char -> Text -> Maybe Text
+parsePrefix c txt = do
+  (c', rst) <- T.uncons txt
+  if c == c'
+  then pure rst
+  else Nothing
+
+parseUserName :: Text -> Maybe UserName
+parseUserName txt = UserName <$> parsePrefix '.' txt
+
+instance FromJSON UserName where
+  parseJSON (String txt) =
+    aesonMaybe "username should be prefixed with '.'"
+               (parseUserName txt)
+
+instance ToJSON UserName where
+  toJSON (UserName txt) = String $ "." `append` txt
+
+newtype GroupName = GroupName Text
+  deriving (Eq, Ord, Show, IsString)
+
+parseGroupName :: Text -> Maybe GroupName
+parseGroupName txt = GroupName <$> parsePrefix '+' txt
+
+instance FromJSON GroupName where
+  parseJSON (String txt) =
+    aesonMaybe "group should be prefixed with '+'"
+               (parseGroupName txt)
+
+instance FromJSONKey GroupName where
+  fromJSONKey = FromJSONKeyTextParser $ \txt -> parseJSON (String txt)
+
+instance ToJSON GroupName where
+  toJSON (GroupName txt) = String $ "+" `append` txt
+
+data Role = User UserName
+          | Group GroupName
+          | Anon
+  deriving (Eq, Ord, Show)
+
+roleToText :: Role -> Text
+roleToText (User (UserName name))   = "." `append` name
+roleToText (Group (GroupName name)) =  "+" `append` name
+roleToText Anon                     = "anon"
+
+textToRole :: Text -> Parser Role
+textToRole "anon" = pure Anon
+textToRole txt    = (User <$> parseJSON (String txt))
+                <|> (Group <$> parseJSON (String txt))
+
+instance FromJSON Role where
+  parseJSON (String txt) = textToRole txt
+
+instance FromJSONKey Role where
+  fromJSONKey = FromJSONKeyTextParser textToRole
+
+instance ToJSON Role where
+  toJSON = toJSON . roleToText
+
+instance ToJSONKey Role where
+  toJSONKey = toJSONKeyText roleToText
+
+data Scope = All
+           | Only (Set Branch)
+           | None
+   deriving (Eq, Show)
+
+data Privilege = Privilege { read  :: Scope
+                           , write :: Scope
+                           }
+  deriving (Show)
+
+readAllScope :: Parsec Void Text Scope
+readAllScope = do
+  char '+'
+  char 'r'
+  pure All
+
+branch :: Parsec Void Text Branch
+branch = Branch . pack <$> some (oneOf ['a'..'z'])
+
+branches :: Parsec Void Text (Set Branch)
+branches = do
+  char '['
+  fst <- branch
+  rst <- many branches'
+  char ']'
+
+  pure (S.fromList (fst:rst))
+  where
+    branches' = do
+      char ','
+      space
+      branch
+
+readScope :: Parsec Void Text Scope
+readScope = do
+  char '+'
+  char 'r'
+  (Only <$> branches) <|> pure All
+
+writeScope :: Parsec Void Text Scope
+writeScope =
+  (do char '-'
+      char 'w'
+      pure None)
+  <|> (do char '+'
+          char 'w'
+          (Only <$> branches) <|> pure All)
+
+scopeLe :: Scope -> Scope -> Bool
+scopeLe None _                  = True
+scopeLe _ All                   = True
+scopeLe (Only set1) (Only set2) = S.isSubsetOf set1 set2
+scopeLe _ _                     = False
+
+privilegeLe :: Privilege -> Privilege -> Bool
+privilegeLe (Privilege r1 w1) (Privilege r2 w2) =
+     r1 `scopeLe` r2
+  && w1 `scopeLe` w2
+
+textToPrivilege :: Text -> Parser Privilege
+textToPrivilege txt = case T.words txt of
+  [p] -> case parseMaybe readScope p of
+    Just x -> pure $ Privilege x None
+    Nothing -> case parseMaybe writeScope p of
+      Just x  -> pure $ Privilege x x
+      Nothing -> fail $ "Invalid privilege notation " ++ unpack p
+  [p1, p2] -> case (parseMaybe readScope p1, parseMaybe writeScope p2) of
+    (Just r, Just w) -> if scopeLe w r
+                        then pure $ Privilege r w
+                        else fail $ "write privilege " ++ unpack p2 ++ " is not less restrictive than read privilege " ++ unpack p1
+    (_, _) -> case (parseMaybe readScope p2, parseMaybe writeScope p1) of
+      (Just r, Just w) -> if scopeLe w r
+                          then pure $ Privilege r w
+                          else fail $ "write privilege " ++ unpack p1 ++ " is not less restrictive than read privilege " ++ unpack p2
+      (_, _) -> fail $ "cannot parse privileges " ++ unpack txt
+
+instance ToJSON Privilege where
+  toJSON (Privilege r w) = toJSON $ priv "r" r `append` " " `append` priv "w" w
+    where priv :: Text -> Scope -> Text
+          priv t All  = "+" `append` t
+          priv t None = "-" `append` t
+          priv t (Only br) = let str = T.intercalate "," (unBranch <$> S.toList br)
+                             in "+" `append` t `append` "[" `append` str `append` "]"
+
+data Pijul = Pijul Repo Action
+  deriving (Show)
+data Action = Log Branch
+            | Apply Branch
+            | Patch Text
+  deriving (Show)
+
+parsePijul :: Text -> Maybe Pijul
+parsePijul = parseMaybe parser
+  where
+    parser :: Parsec Void Text Pijul
+    parser = do
+      string "pijul"
+      space
+      (do string "log"
+          space1
+          (rp, br) <- repoAndBranch
+          space1
+          string "--hash-only"
+          eof
+          pure $ Pijul rp (Log br))
+        <|> (do string "apply"
+                space1
+                (rp, br) <- repoAndBranch
+                eof
+                pure $ Pijul rp (Apply br))
+        <|> (do string "patch"
+                space1
+                rp <- repo
+                space
+                p <- patch
+                eof
+                pure $ Pijul rp (Patch p))
+    repo = do
+      string "--repository"
+      space1
+      rp <- manyTill anyChar space1
+      pure $ Repo rp
+
+    branch = do
+      string "--branch"
+      space1
+      string "\""
+      br <- manyTill anyChar (char '"')
+      pure $ Branch (pack br)
+
+    repoAndBranch = do
+      r <- repo
+      space
+      b <- branch
+      pure (r, b)
+
+    patch = do
+      string "--bin"
+      space1
+      takeP Nothing 88
+
+instance FromJSON Privilege where
+  parseJSON (String str) = textToPrivilege str
+
+data Configuration = Configuration { groups       :: Map GroupName (Set UserName)
+                                   , repositories :: Map Repo (Map Role Privilege)
+                                   }
+  deriving (Show, Generic)
+
+instance FromJSON Configuration
+
+belongsTo :: Map GroupName (Set UserName) -> UserName -> Set GroupName
+belongsTo conf name = M.foldlWithKey aux S.empty conf
+  where aux set group users = if name `S.member` users
+                              then S.insert group set
+                              else set
+
+-- TODO: There is an issue here. The command `pijul patch` does not have an
+-- argument to specify the branch from which a patch is initially fetched; as a
+-- consequence, having read access to a repo, even for another branch where the
+-- patch is not applied, is enough.  For this reason, if a user who obtains a
+-- hash for a patch of a branch they cannot access can fetch the patch. That is,
+-- a patch is as private as its hash. Private branches will eventually be
+-- supported in a better manner, but for now, private branches should mean
+-- separated repositories.
+requires :: Action -> Privilege
+requires (Log branch)   = Privilege (Only $ S.fromList [ branch ]) None
+requires (Patch _)      = Privilege (Only $ S.fromList []) None
+requires (Apply branch) = Privilege None (Only $ S.fromList [ branch ])
+
+checkPrivilege :: UserName -> Pijul -> Configuration -> Bool
+checkPrivilege user (Pijul repo action) conf =
+  maybe False
+        (\rules -> check rules (User user) || S.foldl (aux rules) False grps)
+        (repos !? repo)
+  where
+    needed = requires action
+    repos = repositories conf
+    grps = belongsTo (groups conf) user
+
+    check rules role = maybe False (needed `privilegeLe`) (rules !? role)
+
+    aux _ True _        = True
+    aux rules False grp = check rules (Group grp)
+
+callPijul :: Pijul -> IO ()
+callPijul pijul = callProcess "pijul" $ pijulArgs pijul
+
+recordPijul :: Pijul -> IO String
+recordPijul pijul = do
+  (rd, wd) <- createPipe
+  home <- getHomeDirectory
+
+  runProcess "pijul" (pijulArgs pijul) (Just home) Nothing Nothing (Just wd) Nothing
+  hGetContents rd
+
+pijulArgs :: Pijul -> [String]
+pijulArgs (Pijul (Repo repo) action) =
+  [ actionVerb action
+  , "--repository"
+  , repo
+  ] ++ actionArgs action
+  where
+    actionVerb :: Action -> String
+    actionVerb (Log _)   = "log"
+    actionVerb (Patch _) = "patch"
+    actionVerb (Apply _) = "apply"
+
+    actionArgs :: Action -> [String]
+    actionArgs (Log (Branch branch))   = [ "--branch"
+                                         , unpack branch
+                                         , "--hash-only"
+                                         ]
+    actionArgs (Patch hash)            = [ "--bin"
+                                         , unpack hash
+                                         ]
+    actionArgs (Apply (Branch branch)) = [ "--branch"
+                                         , unpack branch
+                                         ]
diff --git a/test/Spec.hs b/test/Spec.hs
new file mode 100644
--- /dev/null
+++ b/test/Spec.hs
@@ -0,0 +1,2 @@
+main :: IO ()
+main = putStrLn "Test suite not yet implemented"