about summary refs log tree commit diff
path: root/src/nix-instantiate/nix-instantiate.cc
blob: c61cf89c90e429a509c6f19c79a104a7970436e4 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
#include <map>
#include <iostream>

#include "globals.hh"
#include "shared.hh"
#include "eval.hh"
#include "parser.hh"
#include "get-drvs.hh"
#include "attr-path.hh"
#include "value-to-xml.hh"
#include "util.hh"
#include "store-api.hh"
#include "common-opts.hh"
#include "help.txt.hh"


using namespace nix;


void printHelp()
{
    std::cout << string((char *) helpText, sizeof helpText);
}


static Expr * parseStdin(EvalState & state)
{
    startNest(nest, lvlTalkative, format("parsing standard input"));
    string s, s2;
    while (getline(std::cin, s2)) s += s2 + "\n";
    return parseExprFromString(state, s, absPath("."));
}


static Path gcRoot;
static int rootNr = 0;
static bool indirectRoot = false;


void processExpr(EvalState & state, const Strings & attrPaths,
    bool parseOnly, bool strict, const Bindings & autoArgs,
    bool evalOnly, bool xmlOutput, Expr * e)
{
    if (parseOnly)
        std::cout << format("%1%\n") % *e;
    else
        foreach (Strings::const_iterator, i, attrPaths) {
            Value v;
            findAlongAttrPath(state, *i, autoArgs, e, v);
            state.forceValue(v);

            PathSet context;
            if (evalOnly)
                if (xmlOutput)
                    printValueAsXML(state, strict, v, std::cout, context);
                else {
                    if (strict) state.strictForceValue(v);
                    std::cout << v << std::endl;
                }
            else {
                DrvInfos drvs;
                getDerivations(state, v, "", autoArgs, drvs);
                foreach (DrvInfos::iterator, i, drvs) {
                    Path drvPath = i->queryDrvPath(state);
                    if (gcRoot == "")
                        printGCWarning();
                    else
                        drvPath = addPermRoot(drvPath,
                            makeRootName(gcRoot, rootNr),
                            indirectRoot);
                    std::cout << format("%1%\n") % drvPath;
                }
            }
        }
}


void run(Strings args)
{
    EvalState state;
    Strings files;
    bool readStdin = false;
    bool evalOnly = false;
    bool parseOnly = false;
    bool xmlOutput = false;
    bool strict = false;
    Strings attrPaths;
    Bindings autoArgs;

    for (Strings::iterator i = args.begin(); i != args.end(); ) {
        string arg = *i++;

        if (arg == "-")
            readStdin = true;
        else if (arg == "--eval-only") {
            readOnlyMode = true;
            evalOnly = true;
        }
        else if (arg == "--parse-only") {
            readOnlyMode = true;
            parseOnly = evalOnly = true;
        }
        else if (arg == "--attr" || arg == "-A") {
            if (i == args.end())
                throw UsageError("`--attr' requires an argument");
            attrPaths.push_back(*i++);
        }
        else if (parseOptionArg(arg, i, args.end(), state, autoArgs))
            ;
        else if (arg == "--add-root") {
            if (i == args.end())
                throw UsageError("`--add-root' requires an argument");
            gcRoot = absPath(*i++);
        }
        else if (arg == "--indirect")
            indirectRoot = true;
        else if (arg == "--xml")
            xmlOutput = true;
        else if (arg == "--strict")
            strict = true;
        else if (arg[0] == '-')
            throw UsageError(format("unknown flag `%1%'") % arg);
        else
            files.push_back(arg);
    }

    if (attrPaths.empty()) attrPaths.push_back("");

    store = openStore();

    if (readStdin) {
        Expr * e = parseStdin(state);
        processExpr(state, attrPaths, parseOnly, strict, autoArgs,
            evalOnly, xmlOutput, e);
    }

    foreach (Strings::iterator, i, files) {
        Path path = absPath(*i);
        Expr * e = parseExprFromFile(state, path);
        processExpr(state, attrPaths, parseOnly, strict, autoArgs,
            evalOnly, xmlOutput, e);
    }

    state.printStats();
}


string programId = "nix-instantiate";