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
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
#include "get-drvs.hh"
#include "nixexpr-ast.hh"
typedef set<Expr> Exprs;
/* Evaluate expression `e'. If it evaluates to an attribute set of
type `derivation', then put information about it in `drvs' (unless
it's already in `doneExprs'). The result boolean indicates whether
it makes sense for the caller to recursively search for derivations
in `e'. */
static bool getDerivation(EvalState & state, Expr e,
DrvInfos & drvs, Exprs & doneExprs)
{
try {
ATermList es;
e = evalExpr(state, e);
if (!matchAttrs(e, es)) return true;
ATermMap attrs;
queryAllAttrs(e, attrs, false);
Expr a = attrs.get("type");
if (!a || evalString(state, a) != "derivation") return true;
/* Remove spurious duplicates (e.g., an attribute set like
`rec { x = derivation {...}; y = x;}'. */
if (doneExprs.find(e) != doneExprs.end()) return false;
doneExprs.insert(e);
DrvInfo drv;
a = attrs.get("name");
if (!a) throw badTerm("derivation name missing", e);
drv.name = evalString(state, a);
a = attrs.get("system");
if (!a)
drv.system = "unknown";
else
drv.system = evalString(state, a);
drv.attrs = attrs;
drvs.push_back(drv);
return false;
} catch (AssertionError & e) {
return false;
}
}
bool getDerivation(EvalState & state, Expr e, DrvInfo & drv)
{
Exprs doneExprs;
DrvInfos drvs;
getDerivation(state, e, drvs, doneExprs);
if (drvs.size() != 1) return false;
drv = drvs.front();
return true;
}
static void getDerivations(EvalState & state, Expr e,
DrvInfos & drvs, Exprs & doneExprs, const string & attrPath)
{
/* Automatically call functions that have defaults for all
arguments. */
ATermList formals;
ATerm body, pos;
if (matchFunction(e, formals, body, pos)) {
for (ATermIterator i(formals); i; ++i) {
Expr name, def;
if (matchNoDefFormal(*i, name))
throw Error(format("expression evaluates to a function with no-default arguments (`%1%')")
% aterm2String(name));
else if (!matchDefFormal(*i, name, def))
abort(); /* can't happen */
}
getDerivations(state,
makeCall(e, makeAttrs(ATermMap())),
drvs, doneExprs, attrPath);
return;
}
/* Parse the start of attrPath. */
enum { apNone, apAttr, apIndex } apType;
string attrPathRest;
string attr;
int attrIndex;
Error attrError =
Error(format("attribute selection path `%1%' does not match expression") % attrPath);
if (attrPath.empty())
apType = apNone;
else {
string::size_type dot = attrPath.find(".");
if (dot == string::npos) {
attrPathRest = "";
attr = attrPath;
} else {
attrPathRest = string(attrPath, dot + 1);
attr = string(attrPath, 0, dot);
}
apType = apAttr;
if (string2Int(attr, attrIndex)) apType = apIndex;
}
/* Process the expression. */
ATermList es;
DrvInfo drv;
if (!getDerivation(state, e, drvs, doneExprs)) {
if (apType != apNone) throw attrError;
return;
}
e = evalExpr(state, e);
if (matchAttrs(e, es)) {
if (apType != apNone && apType != apAttr) throw attrError;
ATermMap drvMap;
queryAllAttrs(e, drvMap);
if (apType == apNone) {
for (ATermIterator i(drvMap.keys()); i; ++i) {
startNest(nest, lvlDebug,
format("evaluating attribute `%1%'") % aterm2String(*i));
getDerivation(state, drvMap.get(*i), drvs, doneExprs);
}
} else {
Expr e2 = drvMap.get(attr);
if (!e2) throw Error(format("attribute `%1%' in selection path not found") % attr);
startNest(nest, lvlDebug,
format("evaluating attribute `%1%'") % attr);
getDerivation(state, e2, drvs, doneExprs);
if (!attrPath.empty())
getDerivations(state, e2, drvs, doneExprs, attrPathRest);
}
return;
}
if (matchList(e, es)) {
if (apType != apNone && apType != apIndex) throw attrError;
if (apType == apNone) {
for (ATermIterator i(es); i; ++i) {
startNest(nest, lvlDebug,
format("evaluating list element"));
if (getDerivation(state, *i, drvs, doneExprs))
getDerivations(state, *i, drvs, doneExprs, attrPathRest);
}
} else {
Expr e2 = ATelementAt(es, attrIndex);
if (!e2) throw Error(format("list index %1% in selection path not found") % attrIndex);
startNest(nest, lvlDebug,
format("evaluating list element"));
if (getDerivation(state, e2, drvs, doneExprs))
getDerivations(state, e2, drvs, doneExprs, attrPathRest);
}
return;
}
throw Error("expression does not evaluate to a derivation (or a set or list of those)");
}
void getDerivations(EvalState & state, Expr e, DrvInfos & drvs,
const string & attrPath)
{
Exprs doneExprs;
getDerivations(state, e, drvs, doneExprs, attrPath);
}
|
