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builtins.fetchgit: Support a "name" attribute

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The "name" attribute defaults to "source", which we should use for all
similar functions (e.g. fetchTarball and in Hydra) to ensure that we
get a consistent store path regardless of how the tree is fetched.

"source" is not necessarily a correct label, but using an empty name
is problematic: you get an ugly store path ending in a dash, and it's
impossible to have a fixed-output derivation that produces that path
because ".drv" is not a valid store name.

Fixes #904.
This commit is contained in:
Eelco Dolstra 2017-10-30 09:57:38 +01:00
parent c1ae18941a
commit 65b5f177b5
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GPG key ID: 8170B4726D7198DE
2 changed files with 18 additions and 11 deletions
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26
src/libexpr/primops/fetchgit.cc
View file

@ -8,10 +8,13 @@
#include <regex>
using namespace std::string_literals;
namespace nix {
Path exportGit(ref<Store> store, const std::string & uri,
const std::string & ref, const std::string & rev)
const std::string & ref, const std::string & rev,
const std::string & name)
{
if (rev != "") {
std::regex revRegex("^[0-9a-fA-F]{40}$");
@ -51,12 +54,12 @@ Path exportGit(ref<Store> store, const std::string & uri,
}
// FIXME: check whether rev is an ancestor of ref.
std::string commitHash =
rev != "" ? rev : chomp(readFile(localRefFile));
std::string commitHash = rev != "" ? rev : chomp(readFile(localRefFile));
printTalkative("using revision %s of repo '%s'", uri, commitHash);
Path storeLink = cacheDir + "/" + commitHash + ".link";
std::string storeLinkName = hashString(htSHA512, name + std::string("\0"s) + commitHash).to_string(Base32, false);
Path storeLink = cacheDir + "/" + storeLinkName + ".link";
PathLocks storeLinkLock({storeLink}, fmt("waiting for lock on '%1%'...", storeLink));
if (pathExists(storeLink)) {
@ -76,7 +79,7 @@ Path exportGit(ref<Store> store, const std::string & uri,
runProgram("tar", true, { "x", "-C", tmpDir }, tar);
auto storePath = store->addToStore("git-export", tmpDir);
auto storePath = store->addToStore(name, tmpDir);
replaceSymlink(storePath, storeLink);
@ -91,6 +94,7 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
std::string url;
std::string ref = "master";
std::string rev;
std::string name = "source";
state.forceValue(*args[0]);
@ -99,16 +103,18 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
state.forceAttrs(*args[0], pos);
for (auto & attr : *args[0]->attrs) {
string name(attr.name);
if (name == "url") {
string n(attr.name);
if (n == "url") {
PathSet context;
url = state.coerceToString(*attr.pos, *attr.value, context, false, false);
if (hasPrefix(url, "/")) url = "file://" + url;
}
else if (name == "ref")
else if (n == "ref")
ref = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (name == "rev")
else if (n == "rev")
rev = state.forceStringNoCtx(*attr.value, *attr.pos);
else if (n == "name")
name = state.forceStringNoCtx(*attr.value, *attr.pos);
else
throw EvalError("unsupported argument '%s' to 'fetchgit', at %s", attr.name, *attr.pos);
}
@ -119,7 +125,7 @@ static void prim_fetchgit(EvalState & state, const Pos & pos, Value * * args, Va
} else
url = state.forceStringNoCtx(*args[0], pos);
Path storePath = exportGit(state.store, url, ref, rev);
Path storePath = exportGit(state.store, url, ref, rev, name);
mkString(v, storePath, PathSet({storePath}));
}

3
src/libexpr/primops/fetchgit.hh
View file

@ -9,6 +9,7 @@ namespace nix {
class Store;
Path exportGit(ref<Store> store, const std::string & uri,
const std::string & ref, const std::string & rev = "");
const std::string & ref, const std::string & rev = "",
const std::string & name = "");
}