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nix dev-shell: Support structured attrs

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Tested against https://github.com/NixOS/nixpkgs/pull/72074.

Fixes #3540.
This commit is contained in:
Eelco Dolstra 2020-04-30 14:39:26 +02:00
parent 2fcfc6c2c6
commit efe6c186ea
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GPG key ID: 8170B4726D7198DE
2 changed files with 33 additions and 13 deletions
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1
src/nix/get-env.sh
View file

@ -1,4 +1,5 @@
set -e
if [ -e .attrs.sh ]; then source .attrs.sh; fi
export IN_NIX_SHELL=impure
export dontAddDisableDepTrack=1
if [[ -n $stdenv ]]; then

39
src/nix/shell.cc
View file

@ -13,7 +13,8 @@ using namespace nix;
struct Var
{
bool exported;
bool exported = true;
bool associative = false;
std::string value; // quoted string or array
};
@ -48,11 +49,17 @@ BuildEnvironment readEnvironment(const Path & path)
static std::string quotedStringRegex =
R"re((?:\$?'(?:[^'\\]|\\[abeEfnrtv\\'"?])*'))re";
static std::string arrayRegex =
R"re((?:\(( *\[[^\]]+\]="(?:[^"\\]|\\.)*")*\)))re";
static std::string indexedArrayRegex =
R"re((?:\(( *\[[0-9]+]="(?:[^"\\]|\\.)*")**\)))re";
static std::regex varRegex(
"^(" + varNameRegex + ")=(" + simpleStringRegex + "|" + quotedStringRegex + "|" + arrayRegex + ")\n");
"^(" + varNameRegex + ")=(" + simpleStringRegex + "|" + quotedStringRegex + "|" + indexedArrayRegex + ")\n");
/* Note: we distinguish between an indexed and associative array
using the space before the closing parenthesis. Will
undoubtedly regret this some day. */
static std::regex assocArrayRegex(
"^(" + varNameRegex + ")=" + R"re((?:\(( *\[[^\]]+\]="(?:[^"\\]|\\.)*")* *\)))re" + "\n");
static std::regex functionRegex(
"^" + varNameRegex + " \\(\\) *\n");
@ -68,7 +75,12 @@ BuildEnvironment readEnvironment(const Path & path)
else if (std::regex_search(pos, file.cend(), match, varRegex)) {
pos = match[0].second;
res.env.insert({match[1], Var { (bool) exported.count(match[1]), match[2] }});
res.env.insert({match[1], Var { .exported = exported.count(match[1]) > 0, .value = match[2] }});
}
else if (std::regex_search(pos, file.cend(), match, assocArrayRegex)) {
pos = match[0].second;
res.env.insert({match[1], Var { .associative = true, .value = match[2] }});
}
else if (std::regex_search(pos, file.cend(), match, functionRegex)) {
@ -92,8 +104,10 @@ const static std::string getEnvSh =
modified derivation with the same dependencies and nearly the same
initial environment variables, that just writes the resulting
environment to a file and exits. */
StorePath getDerivationEnvironment(ref<Store> store, Derivation drv)
StorePath getDerivationEnvironment(ref<Store> store, const StorePath & drvPath)
{
auto drv = store->derivationFromPath(drvPath);
auto builder = baseNameOf(drv.builder);
if (builder != "bash")
throw Error("'nix dev-shell' only works on derivations that use 'bash' as their builder");
@ -108,11 +122,12 @@ StorePath getDerivationEnvironment(ref<Store> store, Derivation drv)
drv.env.erase("disallowedReferences");
drv.env.erase("disallowedRequisites");
// FIXME: handle structured attrs
/* Rehash and write the derivation. FIXME: would be nice to use
'buildDerivation', but that's privileged. */
auto drvName = drv.env["name"] + "-env";
auto drvName = std::string(drvPath.name());
assert(hasSuffix(drvName, ".drv"));
drvName.resize(drvName.size() - 4);
drvName += "-env";
for (auto & output : drv.outputs)
drv.env.erase(output.first);
drv.env["out"] = "";
@ -161,11 +176,15 @@ struct Common : InstallableCommand, MixProfile
for (auto & i : buildEnvironment.env) {
if (!ignoreVars.count(i.first) && !hasPrefix(i.first, "BASH_")) {
if (i.second.associative)
out << fmt("declare -A %s=(%s)\n", i.first, i.second.value);
else {
out << fmt("%s=%s\n", i.first, i.second.value);
if (i.second.exported)
out << fmt("export %s\n", i.first);
}
}
}
out << "PATH=\"$PATH:$nix_saved_PATH\"\n";
@ -194,7 +213,7 @@ struct Common : InstallableCommand, MixProfile
auto & drvPath = *drvs.begin();
return getDerivationEnvironment(store, store->derivationFromPath(drvPath));
return getDerivationEnvironment(store, drvPath);
}
}