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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
#include "misc.hh"
#include "store-api.hh"
#include "local-store.hh"
#include "globals.hh"
namespace nix {
Derivation derivationFromPath(StoreAPI & store, const Path & drvPath)
{
assertStorePath(drvPath);
store.ensurePath(drvPath);
return parseDerivation(readFile(drvPath));
}
void computeFSClosure(StoreAPI & store, const Path & storePath,
PathSet & paths, bool flipDirection, bool includeOutputs)
{
if (paths.find(storePath) != paths.end()) return;
paths.insert(storePath);
PathSet references;
if (flipDirection)
store.queryReferrers(storePath, references);
else
store.queryReferences(storePath, references);
if (includeOutputs && isDerivation(storePath)) {
PathSet outputs = store.queryDerivationOutputs(storePath);
foreach (PathSet::iterator, i, outputs)
if (store.isValidPath(*i))
computeFSClosure(store, *i, paths, flipDirection, true);
}
foreach (PathSet::iterator, i, references)
computeFSClosure(store, *i, paths, flipDirection, includeOutputs);
}
Path findOutput(const Derivation & drv, string id)
{
foreach (DerivationOutputs::const_iterator, i, drv.outputs)
if (i->first == id) return i->second.path;
throw Error(format("derivation has no output `%1%'") % id);
}
void queryMissing(StoreAPI & store, const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
unsigned long long & downloadSize, unsigned long long & narSize)
{
downloadSize = narSize = 0;
PathSet todo(targets.begin(), targets.end()), done;
/* Getting substitute info has high latency when using the binary
cache substituter. Thus it's essential to do substitute
queries in parallel as much as possible. To accomplish this
we do the following:
- For all paths still to be processed (‘todo’), we add all
paths for which we need info to the set ‘query’. For an
unbuilt derivation this is the output paths; otherwise, it's
the path itself.
- We get info about all paths in ‘query’ in parallel.
- We process the results and add new items to ‘todo’ if
necessary. E.g. if a path is substitutable, then we need to
get info on its references.
- Repeat until ‘todo’ is empty.
*/
while (!todo.empty()) {
PathSet query, todoDrv, todoNonDrv;
foreach (PathSet::iterator, i, todo) {
if (done.find(*i) != done.end()) continue;
done.insert(*i);
DrvPathWithOutputs i2 = parseDrvPathWithOutputs(*i);
if (isDerivation(i2.first)) {
if (!store.isValidPath(i2.first)) {
// FIXME: we could try to substitute p.
unknown.insert(*i);
continue;
}
Derivation drv = derivationFromPath(store, i2.first);
PathSet invalid;
// FIXME: only fetch the desired outputs
foreach (DerivationOutputs::iterator, j, drv.outputs)
if (!store.isValidPath(j->second.path)) invalid.insert(j->second.path);
if (invalid.empty()) continue;
todoDrv.insert(i2.first);
if (settings.useSubstitutes) query.insert(invalid.begin(), invalid.end());
}
else {
if (store.isValidPath(*i)) continue;
query.insert(*i);
todoNonDrv.insert(*i);
}
}
todo.clear();
SubstitutablePathInfos infos;
store.querySubstitutablePathInfos(query, infos);
foreach (PathSet::iterator, i, todoDrv) {
// FIXME: cache this
Derivation drv = derivationFromPath(store, *i);
bool mustBuild = false;
if (settings.useSubstitutes) {
foreach (DerivationOutputs::iterator, j, drv.outputs)
if (!store.isValidPath(j->second.path) &&
infos.find(j->second.path) == infos.end())
mustBuild = true;
} else
mustBuild = true;
if (mustBuild) {
willBuild.insert(*i);
todo.insert(drv.inputSrcs.begin(), drv.inputSrcs.end());
foreach (DerivationInputs::iterator, i, drv.inputDrvs)
todo.insert(i->first);
} else
foreach (DerivationOutputs::iterator, i, drv.outputs)
todoNonDrv.insert(i->second.path);
}
foreach (PathSet::iterator, i, todoNonDrv) {
done.insert(*i);
SubstitutablePathInfos::iterator info = infos.find(*i);
if (info != infos.end()) {
willSubstitute.insert(*i);
downloadSize += info->second.downloadSize;
narSize += info->second.narSize;
todo.insert(info->second.references.begin(), info->second.references.end());
} else
unknown.insert(*i);
}
}
}
static void dfsVisit(StoreAPI & store, const PathSet & paths,
const Path & path, PathSet & visited, Paths & sorted,
PathSet & parents)
{
if (parents.find(path) != parents.end())
throw BuildError(format("cycle detected in the references of `%1%'") % path);
if (visited.find(path) != visited.end()) return;
visited.insert(path);
parents.insert(path);
PathSet references;
if (store.isValidPath(path))
store.queryReferences(path, references);
foreach (PathSet::iterator, i, references)
/* Don't traverse into paths that don't exist. That can
happen due to substitutes for non-existent paths. */
if (*i != path && paths.find(*i) != paths.end())
dfsVisit(store, paths, *i, visited, sorted, parents);
sorted.push_front(path);
parents.erase(path);
}
Paths topoSortPaths(StoreAPI & store, const PathSet & paths)
{
Paths sorted;
PathSet visited, parents;
foreach (PathSet::const_iterator, i, paths)
dfsVisit(store, paths, *i, visited, sorted, parents);
return sorted;
}
}
|
