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daemon: Factorize substituter agent spawning.

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* nix/libstore/local-store.hh (class LocalStore)[substituter]: New
method.
[runningSubstituter]: Turn into a shared_ptr.
* nix/libstore/local-store.cc (LocalStore::querySubstitutablePaths):
Call 'substituter' instead of using inline code.
(LocalStore::querySubstitutablePathInfos): Likewise.
(LocalStore::substituter): New method.
This commit is contained in:
Ludovic Courtès 2020-12-01 15:55:57 +01:00
parent 79c6614f58
commit a618a8c620
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GPG key ID: 090B11993D9AEBB5
2 changed files with 17 additions and 17 deletions
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29
nix/libstore/local-store.cc
View file

@ -850,14 +850,7 @@ PathSet LocalStore::querySubstitutablePaths(const PathSet & paths)
if (!settings.useSubstitutes || paths.empty()) return res;
if (!runningSubstituter) {
const Strings args = { "substitute", "--query" };
const std::map<string, string> env = { { "_NIX_OPTIONS", settings.pack() } };
std::unique_ptr<Agent> fresh(new Agent(settings.guixProgram, args, env));
runningSubstituter.swap(fresh);
}
Agent & run = *runningSubstituter;
Agent & run = *substituter();
string s = "have ";
foreach (PathSet::const_iterator, j, paths)
@ -877,18 +870,22 @@ PathSet LocalStore::querySubstitutablePaths(const PathSet & paths)
}
std::shared_ptr<Agent> LocalStore::substituter()
{
if (!runningSubstituter) {
const Strings args = { "substitute", "--query" };
const std::map<string, string> env = { { "_NIX_OPTIONS", settings.pack() } };
runningSubstituter = std::make_shared<Agent>(settings.guixProgram, args, env);
}
return runningSubstituter;
}
void LocalStore::querySubstitutablePathInfos(PathSet & paths, SubstitutablePathInfos & infos)
{
if (!settings.useSubstitutes) return;
if (!runningSubstituter) {
const Strings args = { "substitute", "--query" };
const std::map<string, string> env = { { "_NIX_OPTIONS", settings.pack() } };
std::unique_ptr<Agent> fresh(new Agent(settings.guixProgram, args, env));
runningSubstituter.swap(fresh);
}
Agent & run = *runningSubstituter;
Agent & run = *substituter();
string s = "info ";
foreach (PathSet::const_iterator, i, paths)

5
nix/libstore/local-store.hh
View file

@ -42,7 +42,10 @@ class LocalStore : public StoreAPI
{
private:
/* The currently running substituter or empty. */
std::unique_ptr<Agent> runningSubstituter;
std::shared_ptr<Agent> runningSubstituter;
/* Ensure the substituter is running and return it. */
std::shared_ptr<Agent> substituter();
Path linksDir;