#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);

}
<tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/services/herd.scm?id=d863ec58b045bf2c63e655478a38ad93f64da9df&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2023-07-21 11:58:44 -0400'>2023-07-21</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=f15c5edb1a2423402b32a5262627eb2141becf65'>services: herd: Add a new 'current-service' procedure.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/herd.scm (current-service): New procedure, mostly reusing the
existing current-services.
(current-services): Implement in terms of the above procedure.
</span></span></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2023-05-30 00:15:29 +0200'>2023-05-30</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=d23d8fcee99e7b127f9e649925caca9cf0d36e76'>services: herd: "Resolve" transient services only when needed.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows us to get rid of the "eval root" actions, which in turn
would lead to confusing "Evaluating user expression" messages.

Fixes &lt;https://issues.guix.gnu.org/55857&gt;.

* gnu/services/herd.scm (resolve-transients): In 'values', avoid
'eval-there' call when UNRESOLVED is empty.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-04-21 16:16:37 +0200'>2023-04-21</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=95731b4ef1991f5b85aa9ec9d4fb97c006bec65d'>services: herd: 'load-services/safe' is synonymous with 'load-services'.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is a followup to 547965aa27b6a09cadf42130b7ec7db3f1aee61f.

* gnu/services/herd.scm (load-services/safe): Make an alias for
'load-services'.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2023-03-26 23:24:23 +0200'>2023-03-26</span></td><td><a href='/guix/commit/gnu/services/herd.scm?id=547965aa27b6a09cadf42130b7ec7db3f1aee61f'>services: herd: Remove workaround for Shepherd &lt; 0.5.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/services/herd.scm (load-services/safe): Remove workaround for
Shepherd &lt; 0.5.0, released in 2018.
</span></span></td><td>Ludovic Courtès</td></tr>