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nix-copy-closure -s: Do substitutions via ‘nix-store --serve’

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This means we no longer need an SSH master connection, since we only
execute a single command on the remote host.
This commit is contained in:
Eelco Dolstra 2014-07-10 20:43:04 +02:00
parent 7c3a5090bf
commit 7bb632b024
4 changed files with 43 additions and 11 deletions
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29
src/nix-store/nix-store.cc
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@ -896,16 +896,42 @@ static void opServe(Strings opFlags, Strings opArgs)
}
switch (cmd) {
case cmdQueryValidPaths: {
bool lock = readInt(in);
bool substitute = readInt(in);
PathSet paths = readStorePaths<PathSet>(in);
if (lock && writeAllowed)
for (auto & path : paths)
store->addTempRoot(path);
/* If requested, substitute missing paths. This
implements nix-copy-closure's --use-substitutes
flag. */
if (substitute && writeAllowed) {
/* Filter out .drv files (we don't want to build anything). */
PathSet paths2;
for (auto & path : paths)
if (!isDerivation(path)) paths2.insert(path);
unsigned long long downloadSize, narSize;
PathSet willBuild, willSubstitute, unknown;
queryMissing(*store, PathSet(paths2.begin(), paths2.end()),
willBuild, willSubstitute, unknown, downloadSize, narSize);
/* FIXME: should use ensurePath(), but it only
does one path at a time. */
if (!willSubstitute.empty())
try {
store->buildPaths(willSubstitute);
} catch (Error & e) {
printMsg(lvlError, format("warning: %1%") % e.msg());
}
}
writeStrings(store->queryValidPaths(paths), out);
out.flush();
break;
}
case cmdQueryPathInfos: {
PathSet paths = readStorePaths<PathSet>(in);
// !!! Maybe we want a queryPathInfos?
@ -924,10 +950,12 @@ static void opServe(Strings opFlags, Strings opArgs)
out.flush();
break;
}
case cmdDumpStorePath:
dumpPath(readStorePath(in), out);
out.flush();
break;
case cmdImportPaths: {
if (!writeAllowed) throw Error("importing paths not allowed");
string compression = readString(in);
@ -966,6 +994,7 @@ static void opServe(Strings opFlags, Strings opArgs)
break;
}
default:
throw Error(format("unknown serve command %1%") % cmd);
}