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
|
#include "libstore/globals.hh"
#include <algorithm>
#include <filesystem>
#include <map>
#include <thread>
#include <absl/strings/numbers.h>
#include <absl/strings/str_cat.h>
#include <absl/strings/str_split.h>
#include <dlfcn.h>
#include "libutil/archive.hh"
#include "libutil/args.hh"
#include "libutil/util.hh"
#include "nix_config.h"
namespace nix {
/* The default location of the daemon socket, relative to nixStateDir.
The socket is in a directory to allow you to control access to the
Nix daemon by setting the mode/ownership of the directory
appropriately. (This wouldn't work on the socket itself since it
must be deleted and recreated on startup.) */
#define DEFAULT_SOCKET_PATH "/daemon-socket/socket"
Settings settings;
static GlobalConfig::Register r1(&settings);
Settings::Settings()
: nixPrefix(NIX_PREFIX),
nixStore(canonPath(
getEnv("NIX_STORE_DIR")
.value_or(getEnv("NIX_STORE").value_or(NIX_STORE_DIR)))),
nixDataDir(canonPath(getEnv("NIX_DATA_DIR").value_or(NIX_DATA_DIR))),
nixLogDir(canonPath(getEnv("NIX_LOG_DIR").value_or(NIX_LOG_DIR))),
nixStateDir(canonPath(getEnv("NIX_STATE_DIR").value_or(NIX_STATE_DIR))),
nixConfDir(canonPath(getEnv("NIX_CONF_DIR").value_or(NIX_CONF_DIR))),
nixLibexecDir(
canonPath(getEnv("NIX_LIBEXEC_DIR").value_or(NIX_LIBEXEC_DIR))),
nixBinDir(canonPath(getEnv("NIX_BIN_DIR").value_or(NIX_BIN_DIR))),
nixManDir(canonPath(NIX_MAN_DIR)),
nixDaemonSocketFile(canonPath(nixStateDir + DEFAULT_SOCKET_PATH)) {
buildUsersGroup = getuid() == 0 ? "nixbld" : "";
lockCPU = getEnv("NIX_AFFINITY_HACK").value_or("1") == "1";
caFile = getEnv("NIX_SSL_CERT_FILE")
.value_or(getEnv("SSL_CERT_FILE").value_or(""));
if (caFile.empty()) {
for (auto& fn :
{"/etc/ssl/certs/ca-certificates.crt",
"/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt"}) {
if (pathExists(fn)) {
caFile = fn;
break;
}
}
}
/* Backwards compatibility. */
// TODO(tazjin): still?
auto s = getEnv("NIX_REMOTE_SYSTEMS");
if (s) {
Strings ss;
for (auto p : absl::StrSplit(*s, absl::ByChar(':'), absl::SkipEmpty())) {
ss.push_back(absl::StrCat("@", p));
}
builders = concatStringsSep(" ", ss);
}
sandboxPaths = absl::StrSplit("/bin/sh=" SANDBOX_SHELL,
absl::ByAnyChar(" \t\n\r"), absl::SkipEmpty());
}
void loadConfFile() {
if (std::filesystem::exists(settings.nixConfDir + "/nix.conf")) {
globalConfig.applyConfigFile(settings.nixConfDir + "/nix.conf");
}
/* We only want to send overrides to the daemon, i.e. stuff from
~/.nix/nix.conf or the command line. */
globalConfig.resetOverriden();
auto dirs = getConfigDirs();
// Iterate over them in reverse so that the ones appearing first in the path
// take priority
for (auto dir = dirs.rbegin(); dir != dirs.rend(); dir++) {
if (std::filesystem::exists(*dir + "/nix.conf")) {
globalConfig.applyConfigFile(*dir + "/nix/nix.conf");
}
}
}
unsigned int Settings::getDefaultCores() {
return std::max(1U, std::thread::hardware_concurrency());
}
StringSet Settings::getDefaultSystemFeatures() {
/* For backwards compatibility, accept some "features" that are
used in Nixpkgs to route builds to certain machines but don't
actually require anything special on the machines. */
StringSet features{"nixos-test", "benchmark", "big-parallel"};
#if __linux__
if (access("/dev/kvm", R_OK | W_OK) == 0) {
features.insert("kvm");
}
#endif
return features;
}
const std::string nixVersion = PACKAGE_VERSION;
template <>
void BaseSetting<SandboxMode>::set(const std::string& str) {
if (str == "true") {
value = smEnabled;
} else if (str == "relaxed") {
value = smRelaxed;
} else if (str == "false") {
value = smDisabled;
} else {
throw UsageError("option '%s' has invalid value '%s'", name, str);
}
}
template <>
std::string BaseSetting<SandboxMode>::to_string() {
if (value == smEnabled) {
return "true";
}
if (value == smRelaxed) {
return "relaxed";
} else if (value == smDisabled) {
return "false";
} else {
abort();
}
}
template <>
void BaseSetting<SandboxMode>::toJSON(JSONPlaceholder& out) {
AbstractSetting::toJSON(out);
}
template <>
void BaseSetting<SandboxMode>::convertToArg(Args& args,
const std::string& category) {
args.mkFlag()
.longName(name)
.description("Enable sandboxing.")
.handler([=](const std::vector<std::string>& ss) { override(smEnabled); })
.category(category);
args.mkFlag()
.longName("no-" + name)
.description("Disable sandboxing.")
.handler(
[=](const std::vector<std::string>& ss) { override(smDisabled); })
.category(category);
args.mkFlag()
.longName("relaxed-" + name)
.description("Enable sandboxing, but allow builds to disable it.")
.handler([=](const std::vector<std::string>& ss) { override(smRelaxed); })
.category(category);
}
void MaxBuildJobsSetting::set(const std::string& str) {
if (str == "auto") {
value = std::max(1U, std::thread::hardware_concurrency());
} else if (!absl::SimpleAtoi(str, &value)) {
throw UsageError(
"configuration setting '%s' should be 'auto' or an integer", name);
}
}
} // namespace nix
|
