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Set environment variables for .attrs.json & .attrs.sh

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This way no derivation has to expect that these files are in the `cwd`
during the build. This is problematic for `nix-shell` where these files
would have to be inserted into the nix-shell's `cwd` which can become
problematic with e.g. recursive `nix-shell`.

To remain backwards-compatible, the location inside the build sandbox
will be kept, however using these files directly should be deprecated
from now on.
This commit is contained in:
Maximilian Bosch 2021-05-09 17:46:16 +02:00
parent 3b5429aec1
commit 3944a120ec
No known key found for this signature in database
GPG key ID: 091DBF4D1FC46B8E
4 changed files with 11 additions and 10 deletions
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2
src/libstore/build/local-derivation-goal.cc
View file

@ -1093,8 +1093,10 @@ void LocalDerivationGoal::writeStructuredAttrs()
writeFile(tmpDir + "/.attrs.sh", rewriteStrings(jsonSh, inputRewrites));
chownToBuilder(tmpDir + "/.attrs.sh");
env["ATTRS_SH_FILE"] = tmpDir + "/.attrs.sh";
writeFile(tmpDir + "/.attrs.json", rewriteStrings(json.dump(), inputRewrites));
chownToBuilder(tmpDir + "/.attrs.json");
env["ATTRS_JSON_FILE"] = tmpDir + "/.attrs.json";
}
}

13
src/nix-build/nix-build.cc
View file

@ -428,7 +428,6 @@ static void main_nix_build(int argc, char * * argv)
env[var.first] = var.second;
std::string structuredAttrsRC;
std::string exitCmd;
if (env.count("__json")) {
StorePathSet inputs;
@ -448,11 +447,13 @@ static void main_nix_build(int argc, char * * argv)
if (auto structAttrs = parsedDrv.generateStructuredAttrs(std::nullopt, *store, inputs)) {
auto val = structAttrs.value();
structuredAttrsRC = val.first;
auto attrsJSON = std::filesystem::current_path().string() + "/.attrs.json";
auto attrsJSON = (Path) tmpDir + "/.attrs.json";
writeFile(attrsJSON, val.second.dump());
exitCmd = "\n_rm_attrs_json() { rm -f " + attrsJSON + "; }"
+ "\nexitHooks+=(_rm_attrs_json)"
+ "\nfailureHooks+=(_rm_attrs_json)\n";
auto attrsSH = (Path) tmpDir + "/.attrs.sh";
writeFile(attrsSH, val.first);
env["ATTRS_SH_FILE"] = attrsSH;
env["ATTRS_JSON_FILE"] = attrsJSON;
keepTmp = true;
}
}
@ -471,7 +472,7 @@ static void main_nix_build(int argc, char * * argv)
(pure ? "" : "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;") +
"%2%"
"dontAddDisableDepTrack=1;\n"
+ structuredAttrsRC + exitCmd +
+ structuredAttrsRC +
"\n[ -e $stdenv/setup ] && source $stdenv/setup; "
"%3%"
"PATH=%4%:\"$PATH\"; "

2
tests/structured-attrs.nix
View file

@ -36,7 +36,7 @@ mkDerivation {
echo bar > $dest
echo foo > $dest2
json=$(cat .attrs.json)
json=$(cat $ATTRS_JSON_FILE)
[[ $json =~ '"narHash":"sha256:1r7yc43zqnzl5b0als5vnyp649gk17i37s7mj00xr8kc47rjcybk"' ]]
[[ $json =~ '"narSize":288' ]]
[[ $json =~ '"closureSize":288' ]]

4
tests/structured-attrs.sh
View file

@ -10,7 +10,5 @@ nix-build structured-attrs.nix -A all -o $TEST_ROOT/result
[[ $(cat $TEST_ROOT/result-dev/foo) = foo ]]
export NIX_BUILD_SHELL=$SHELL
[[ ! -e '.attrs.json' ]]
env NIX_PATH=nixpkgs=shell.nix nix-shell structured-attrs-shell.nix \
--run 'test -e .attrs.json; test "3" = "$(jq ".my.list|length" < .attrs.json)"'
[[ ! -e '.attrs.json' ]]
--run 'test -e .attrs.json; test "3" = "$(jq ".my.list|length" < $ATTRS_JSON_FILE)"'