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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
#ifndef __LOCAL_STORE_H
#define __LOCAL_STORE_H
#include <string>
#include <ext/stdio_filebuf.h>
#include "store-api.hh"
#include "util.hh"
namespace nix {
/* Nix store and database schema version. Version 1 (or 0) was Nix <=
0.7. Version 2 was Nix 0.8 and 0.9. Version 3 is Nix 0.10.
Version 4 is Nix 0.11. Version 5 is Nix 0.12*/
const int nixSchemaVersion = 5;
extern string drvsLogDir;
struct OptimiseStats
{
unsigned long totalFiles;
unsigned long sameContents;
unsigned long filesLinked;
unsigned long long bytesFreed;
unsigned long long blocksFreed;
OptimiseStats()
{
totalFiles = sameContents = filesLinked = 0;
bytesFreed = blocksFreed = 0;
}
};
typedef __gnu_cxx::stdio_filebuf<char> stdio_filebuf;
struct RunningSubstituter
{
Pid pid;
boost::shared_ptr<stdio_filebuf> toBuf, fromBuf;
boost::shared_ptr<std::ostream> to;
boost::shared_ptr<std::istream> from;
};
class LocalStore : public StoreAPI
{
private:
bool substitutablePathsLoaded;
PathSet substitutablePaths;
typedef std::map<Path, RunningSubstituter> RunningSubstituters;
RunningSubstituters runningSubstituters;
public:
/* Initialise the local store, upgrading the schema if
necessary. */
LocalStore();
~LocalStore();
/* Implementations of abstract store API methods. */
bool isValidPath(const Path & path);
PathSet queryValidPaths();
Hash queryPathHash(const Path & path);
void queryReferences(const Path & path, PathSet & references);
void queryReferrers(const Path & path, PathSet & referrers);
Path queryDeriver(const Path & path);
PathSet querySubstitutablePaths();
bool hasSubstitutes(const Path & path);
bool querySubstitutablePathInfo(const Path & path,
SubstitutablePathInfo & info);
bool querySubstitutablePathInfo(const Path & substituter,
const Path & path, SubstitutablePathInfo & info);
Path addToStore(const Path & srcPath,
bool recursive = true, HashType hashAlgo = htSHA256,
PathFilter & filter = defaultPathFilter);
/* Like addToStore(), but the contents of the path are contained
in `dump', which is either a NAR serialisation (if recursive ==
true) or simply the contents of a regular file (if recursive ==
false). */
Path addToStoreFromDump(const string & dump, const string & name,
bool recursive = true, HashType hashAlgo = htSHA256);
Path addTextToStore(const string & name, const string & s,
const PathSet & references);
void exportPath(const Path & path, bool sign,
Sink & sink);
Path importPath(bool requireSignature, Source & source);
void buildDerivations(const PathSet & drvPaths);
void ensurePath(const Path & path);
void addTempRoot(const Path & path);
void addIndirectRoot(const Path & path);
void syncWithGC();
Roots findRoots();
void collectGarbage(const GCOptions & options, GCResults & results);
/* Delete a path from the Nix store. */
void deleteFromStore(const Path & path, unsigned long long & bytesFreed,
unsigned long long & blocksFreed);
/* Optimise the disk space usage of the Nix store by hard-linking
files with the same contents. */
void optimiseStore(bool dryRun, OptimiseStats & stats);
/* Check the integrity of the Nix store. */
void verifyStore(bool checkContents);
/* Register the validity of a path, i.e., that `path' exists, that
the paths referenced by it exists, and in the case of an output
path of a derivation, that it has been produced by a succesful
execution of the derivation (or something equivalent). Also
register the hash of the file system contents of the path. The
hash must be a SHA-256 hash. */
void registerValidPath(const Path & path,
const Hash & hash, const PathSet & references, const Path & deriver);
void registerValidPaths(const ValidPathInfos & infos);
private:
Path schemaPath;
/* Lock file used for upgrading. */
AutoCloseFD globalLock;
/* !!! The cache can grow very big. Maybe it should be pruned
every once in a while. */
std::map<Path, ValidPathInfo> pathInfoCache;
/* Store paths for which the referrers file must be purged. */
PathSet delayedUpdates;
int getSchema();
void registerValidPath(const ValidPathInfo & info, bool ignoreValidity = false);
ValidPathInfo queryPathInfo(const Path & path, bool ignoreErrors = false);
void rewriteReferrers(const Path & path, bool purge, PathSet referrers);
void flushDelayedUpdates();
bool queryReferrersInternal(const Path & path, PathSet & referrers);
void invalidatePath(const Path & path);
void upgradeStore12();
void gcPath(const GCOptions & options, GCResults & results,
const Path & path);
void gcPathRecursive(const GCOptions & options,
GCResults & results, PathSet & done, const Path & path);
void startSubstituter(const Path & substituter,
RunningSubstituter & runningSubstituter);
};
/* Copy a path recursively. */
void copyPath(const Path & src, const Path & dst);
/* "Fix", or canonicalise, the meta-data of the files in a store path
after it has been built. In particular:
- the last modification date on each file is set to 0 (i.e.,
00:00:00 1/1/1970 UTC)
- the permissions are set of 444 or 555 (i.e., read-only with or
without execute permission; setuid bits etc. are cleared)
- the owner and group are set to the Nix user and group, if we're
in a setuid Nix installation. */
void canonicalisePathMetaData(const Path & path);
void canonicalisePathMetaData(const Path & path, bool recurse);
MakeError(PathInUse, Error);
/* Whether we are in build users mode. */
bool haveBuildUsers();
/* Whether we are root. */
bool amPrivileged();
/* Recursively change the ownership of `path' to the current uid. */
void getOwnership(const Path & path);
/* Like deletePath(), but changes the ownership of `path' using the
setuid wrapper if necessary (and possible). */
void deletePathWrapped(const Path & path,
unsigned long long & bytesFreed, unsigned long long & blocksFreed);
void deletePathWrapped(const Path & path);
}
#endif /* !__LOCAL_STORE_H */
|
