#pragma once

#include "types.hh"
#include "hash.hh"

#include <map>


namespace nix {


/* Extension of derivations in the Nix store. */
const string drvExtension = ".drv";


/* Abstract syntax of derivations. */

struct DerivationOutput
{
    Path path;
    string hashAlgo; /* hash used for expected hash computation */
    string hash; /* expected hash, may be null */
    DerivationOutput()
    {
    }
    DerivationOutput(Path path, string hashAlgo, string hash)
    {
        this->path = path;
        this->hashAlgo = hashAlgo;
        this->hash = hash;
    }
    void parseHashInfo(bool & recursive, HashType & hashType, Hash & hash) const;
};

typedef std::map<string, DerivationOutput> DerivationOutputs;

/* For inputs that are sub-derivations, we specify exactly which
   output IDs we are interested in. */
typedef std::map<Path, StringSet> DerivationInputs;

typedef std::map<string, string> StringPairs;

struct Derivation
{
    DerivationOutputs outputs; /* keyed on symbolic IDs */
    DerivationInputs inputDrvs; /* inputs that are sub-derivations */
    PathSet inputSrcs; /* inputs that are sources */
    string platform;
    Path builder;
    Strings args;
    StringPairs env;
};


class StoreAPI;


/* Write a derivation to the Nix store, and return its path. */
Path writeDerivation(StoreAPI & store,
    const Derivation & drv, const string & name, bool repair = false);

/* Read a derivation from a file. */
Derivation readDerivation(const Path & drvPath);

/* Print a derivation. */
string unparseDerivation(const Derivation & drv);

/* Check whether a file name ends with the extensions for
   derivations. */
bool isDerivation(const string & fileName);

/* Return true iff this is a fixed-output derivation. */
bool isFixedOutputDrv(const Derivation & drv);

Hash hashDerivationModulo(StoreAPI & store, Derivation drv);

/* Memoisation of hashDerivationModulo(). */
typedef std::map<Path, Hash> DrvHashes;

extern DrvHashes drvHashes;

/* Split a string specifying a derivation and a set of outputs
   (/nix/store/hash-foo!out1,out2,...) into the derivation path and
   the outputs. */
typedef std::pair<string, std::set<string> > DrvPathWithOutputs;
DrvPathWithOutputs parseDrvPathWithOutputs(const string & s);

Path makeDrvPathWithOutputs(const Path & drvPath, const std::set<string> & outputs);

bool wantOutput(const string & output, const std::set<string> & wanted);

PathSet outputPaths(const Derivation & drv);

}
='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/ssh.scm?id=80a67734834a0981ca65cf1757a7d8408d02f1fd&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2015-10-10 22:55:15 +0200'>2015-10-10</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=0adfe95a3eee335847c3127edde3de550e692440'>services: Introduce extensible services.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-10-10 22:46:14 +0200'>2015-10-10</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=be1c2c54d9f918f50f71c6d32a72d4498c07504c'>system: Make service procedures non-monadic.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-04-03 22:58:49 +0200'>2015-04-03</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=21cc905ac20c1e9dec4610f92b3d2202f2e9dcb2'>services: lsh: Change #:initialize? to default to #t.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-02-08 21:52:26 +0100'>2015-02-08</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=5833bf33a277d12357858e07ba34c5b5e3e69d55'>services: lsh: Add graceful handling of daemonic option.</a><span class='msg-avail'>...</span></td><td>nebuli</td></tr>
<tr><td><span title='2015-01-14 13:34:52 +0100'>2015-01-14</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=e87f0591f3117ed61285f33c7cc3548f72e551ad'>monads: Move '%store-monad' and related procedures where they belong.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-11-24 21:52:39 +0100'>2014-11-24</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=20dd519cdbb93799f6e4edc2fb39d6f6aa5b81c0'>doc: Add xrefs to the lsh manual.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-08-07 21:09:51 -0400'>2014-08-07</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=1f347f55333251059cf26c900e75115e70959606'>services: lsh: Fix activation script.</a><span class='msg-avail'>...</span></td><td>Mark H Weaver</td></tr>
<tr><td><span title='2014-07-08 00:12:31 +0200'>2014-07-08</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=1c6b445b40dd693e9c2741942156258a89ebdb8b'>services: Update to use the dmd 0.2 API.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2014-07-01 09:23:32 +0200'>2014-07-01</span></td><td><a href='/guix/commit/gnu/services/ssh.scm?id=f33e2d78b76c84132548d14dd2878e3526ac3d8c'>services: Add lshd service.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>