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Improve error messages for invalid derivation names

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This commit is contained in:
Robert Hensing 2024-06-20 22:20:17 +02:00
parent 5f4f789144
commit 7df9d6da65
16 changed files with 145 additions and 16 deletions
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22
src/libexpr/primops.cc
View file

@ -1162,12 +1162,34 @@ static void prim_derivationStrict(EvalState & state, const PosIdx pos, Value * *
}
}
/**
* Early validation for the derivation name, for better error message.
* It is checked again when constructing store paths.
*
* @todo Check that the `.drv` suffix also fits.
*/
static void checkDerivationName(EvalState & state, std::string_view drvName)
{
try {
checkName(drvName);
} catch (BadStorePathName & e) {
// "Please pass a different name": Users may not be aware that they can
// pass a different one, in functions like `fetchurl` where the name
// is optional.
// Note that Nixpkgs generally won't trigger this, because `mkDerivation`
// sanitizes the name.
state.error<EvalError>("invalid derivation name: %s. Please pass a different '%s'.", Uncolored(e.message()), "name").debugThrow();
}
}
static void derivationStrictInternal(
EvalState & state,
const std::string & drvName,
const Bindings * attrs,
Value & v)
{
checkDerivationName(state, drvName);
/* Check whether attributes should be passed as a JSON file. */
using nlohmann::json;
std::optional<json> jsonObject;

22
src/libexpr/primops/fetchTree.cc
View file

@ -431,7 +431,10 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
state.forceValue(*args[0], pos);
if (args[0]->type() == nAttrs) {
bool isArgAttrs = args[0]->type() == nAttrs;
bool nameAttrPassed = false;
if (isArgAttrs) {
for (auto & attr : *args[0]->attrs()) {
std::string_view n(state.symbols[attr.name]);
@ -439,8 +442,10 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
url = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the url we should fetch");
else if (n == "sha256")
expectedHash = newHashAllowEmpty(state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the sha256 of the content we should fetch"), HashAlgorithm::SHA256);
else if (n == "name")
else if (n == "name") {
nameAttrPassed = true;
name = state.forceStringNoCtx(*attr.value, attr.pos, "while evaluating the name of the content we should fetch");
}
else
state.error<EvalError>("unsupported argument '%s' to '%s'", n, who)
.atPos(pos).debugThrow();
@ -460,6 +465,19 @@ static void fetch(EvalState & state, const PosIdx pos, Value * * args, Value & v
if (name == "")
name = baseNameOf(*url);
try {
checkName(name);
} catch (BadStorePathName & e) {
auto resolution =
nameAttrPassed ? HintFmt("Please change the value for the 'name' attribute passed to '%s', so that it can create a valid store path.", who) :
isArgAttrs ? HintFmt("Please add a valid 'name' attribute to the argument for '%s', so that it can create a valid store path.", who) :
HintFmt("Please pass an attribute set with 'url' and 'name' attributes to '%s', so that it can create a valid store path.", who);
state.error<EvalError>(
std::string("invalid store path name when fetching URL '%s': %s. %s"), *url, Uncolored(e.message()), Uncolored(resolution.str()))
.atPos(pos).debugThrow();
}
if (state.settings.pureEval && !expectedHash)
state.error<EvalError>("in pure evaluation mode, '%s' requires a 'sha256' argument", who).atPos(pos).debugThrow();

30
src/libstore/path.cc
View file

@ -2,25 +2,24 @@
namespace nix {
static void checkName(std::string_view path, std::string_view name)
void checkName(std::string_view name)
{
if (name.empty())
throw BadStorePath("store path '%s' has an empty name", path);
throw BadStorePathName("name must not be empty");
if (name.size() > StorePath::MaxPathLen)
throw BadStorePath("store path '%s' has a name longer than %d characters",
path, StorePath::MaxPathLen);
throw BadStorePathName("name '%s' must be no longer than %d characters", name, StorePath::MaxPathLen);
// See nameRegexStr for the definition
if (name[0] == '.') {
// check against "." and "..", followed by end or dash
if (name.size() == 1)
throw BadStorePath("store path '%s' has invalid name '%s'", path, name);
throw BadStorePathName("name '%s' is not valid", name);
if (name[1] == '-')
throw BadStorePath("store path '%s' has invalid name '%s': first dash-separated component must not be '%s'", path, name, ".");
throw BadStorePathName("name '%s' is not valid: first dash-separated component must not be '%s'", name, ".");
if (name[1] == '.') {
if (name.size() == 2)
throw BadStorePath("store path '%s' has invalid name '%s'", path, name);
throw BadStorePathName("name '%s' is not valid", name);
if (name[2] == '-')
throw BadStorePath("store path '%s' has invalid name '%s': first dash-separated component must not be '%s'", path, name, "..");
throw BadStorePathName("name '%s' is not valid: first dash-separated component must not be '%s'", name, "..");
}
}
for (auto c : name)
@ -28,7 +27,16 @@ static void checkName(std::string_view path, std::string_view name)
|| (c >= 'a' && c <= 'z')
|| (c >= 'A' && c <= 'Z')
|| c == '+' || c == '-' || c == '.' || c == '_' || c == '?' || c == '='))
throw BadStorePath("store path '%s' contains illegal character '%s'", path, c);
throw BadStorePathName("name '%s' contains illegal character '%s'", name, c);
}
static void checkPathName(std::string_view path, std::string_view name)
{
try {
checkName(name);
} catch (BadStorePathName & e) {
throw BadStorePath("path '%s' is not a valid store path: %s", path, Uncolored(e.message()));
}
}
StorePath::StorePath(std::string_view _baseName)
@ -40,13 +48,13 @@ StorePath::StorePath(std::string_view _baseName)
if (c == 'e' || c == 'o' || c == 'u' || c == 't'
|| !((c >= '0' && c <= '9') || (c >= 'a' && c <= 'z')))
throw BadStorePath("store path '%s' contains illegal base-32 character '%s'", baseName, c);
checkName(baseName, name());
checkPathName(baseName, name());
}
StorePath::StorePath(const Hash & hash, std::string_view _name)
: baseName((hash.to_string(HashFormat::Nix32, false) + "-").append(std::string(_name)))
{
checkName(baseName, name());
checkPathName(baseName, name());
}
bool StorePath::isDerivation() const noexcept

9
src/libstore/path.hh
View file

@ -9,6 +9,13 @@ namespace nix {
struct Hash;
/**
* Check whether a name is a valid store path name.
*
* @throws BadStorePathName if the name is invalid. The message is of the format "name %s is not valid, for this specific reason".
*/
void checkName(std::string_view name);
/**
* \ref StorePath "Store path" is the fundamental reference type of Nix.
* A store paths refers to a Store object.
@ -31,8 +38,10 @@ public:
StorePath() = delete;
/** @throws BadStorePath */
StorePath(std::string_view baseName);
/** @throws BadStorePath */
StorePath(const Hash & hash, std::string_view name);
std::string_view to_string() const noexcept

1
src/libstore/store-dir-config.hh
View file

@ -16,6 +16,7 @@ namespace nix {
struct SourcePath;
MakeError(BadStorePath, Error);
MakeError(BadStorePathName, BadStorePath);
struct StoreDirConfig : public Config
{

1
src/libutil/error.hh
View file

@ -155,6 +155,7 @@ public:
: err(e)
{ }
/** The error message without "error: " prefixed to it. */
std::string message() {
return err.msg.str();
}

2
src/libutil/fmt.hh
View file

@ -111,6 +111,8 @@ std::ostream & operator<<(std::ostream & out, const Magenta<T> & y)
/**
* Values wrapped in this class are printed without coloring.
*
* Specifically, the color is reset to normal before printing the value.
*
* By default, arguments to `HintFmt` are printed in magenta (see `Magenta`).
*/
template <class T>

26
tests/functional/lang/eval-fail-derivation-name.err.exp Normal file
View file

@ -0,0 +1,26 @@
error:
… while evaluating the attribute 'outPath'
at <nix/derivation-internal.nix>:19:9:
18| value = commonAttrs // {
19| outPath = builtins.getAttr outputName strict;
| ^
20| drvPath = strict.drvPath;
… while calling the 'getAttr' builtin
at <nix/derivation-internal.nix>:19:19:
18| value = commonAttrs // {
19| outPath = builtins.getAttr outputName strict;
| ^
20| drvPath = strict.drvPath;
… while calling the 'derivationStrict' builtin
at <nix/derivation-internal.nix>:9:12:
8|
9| strict = derivationStrict drvAttrs;
| ^
10|
… while evaluating derivation '~jiggle~'
whose name attribute is located at /pwd/lang/eval-fail-derivation-name.nix:2:3
error: invalid derivation name: name '~jiggle~' contains illegal character '~'. Please pass a different 'name'.

5
tests/functional/lang/eval-fail-derivation-name.nix Normal file
View file

@ -0,0 +1,5 @@
derivation {
name = "~jiggle~";
system = "some-system";
builder = "/dontcare";
}

8
tests/functional/lang/eval-fail-fetchurl-baseName-attrs-name.err.exp Normal file
View file

@ -0,0 +1,8 @@
error:
… while calling the 'fetchurl' builtin
at /pwd/lang/eval-fail-fetchurl-baseName-attrs-name.nix:1:1:
1| builtins.fetchurl { url = "https://example.com/foo.tar.gz"; name = "~wobble~"; }
| ^
2|
error: invalid store path name when fetching URL 'https://example.com/foo.tar.gz': name '~wobble~' contains illegal character '~'. Please change the value for the 'name' attribute passed to 'fetchurl', so that it can create a valid store path.

1
tests/functional/lang/eval-fail-fetchurl-baseName-attrs-name.nix Normal file
View file

@ -0,0 +1 @@
builtins.fetchurl { url = "https://example.com/foo.tar.gz"; name = "~wobble~"; }

8
tests/functional/lang/eval-fail-fetchurl-baseName-attrs.err.exp Normal file
View file

@ -0,0 +1,8 @@
error:
… while calling the 'fetchurl' builtin
at /pwd/lang/eval-fail-fetchurl-baseName-attrs.nix:1:1:
1| builtins.fetchurl { url = "https://example.com/~wiggle~"; }
| ^
2|
error: invalid store path name when fetching URL 'https://example.com/~wiggle~': name '~wiggle~' contains illegal character '~'. Please add a valid 'name' attribute to the argument for 'fetchurl', so that it can create a valid store path.

1
tests/functional/lang/eval-fail-fetchurl-baseName-attrs.nix Normal file
View file

@ -0,0 +1 @@
builtins.fetchurl { url = "https://example.com/~wiggle~"; }

8
tests/functional/lang/eval-fail-fetchurl-baseName.err.exp Normal file
View file

@ -0,0 +1,8 @@
error:
… while calling the 'fetchurl' builtin
at /pwd/lang/eval-fail-fetchurl-baseName.nix:1:1:
1| builtins.fetchurl "https://example.com/~wiggle~"
| ^
2|
error: invalid store path name when fetching URL 'https://example.com/~wiggle~': name '~wiggle~' contains illegal character '~'. Please pass an attribute set with 'url' and 'name' attributes to 'fetchurl', so that it can create a valid store path.

1
tests/functional/lang/eval-fail-fetchurl-baseName.nix Normal file
View file

@ -0,0 +1 @@
builtins.fetchurl "https://example.com/~wiggle~"

10
tests/unit/libstore/path.cc
View file

@ -26,10 +26,19 @@ static std::regex nameRegex { std::string { nameRegexStr } };
TEST_F(StorePathTest, bad_ ## NAME) { \
std::string_view str = \
STORE_DIR HASH_PART "-" STR; \
/* ASSERT_THROW generates a duplicate goto label */ \
/* A lambda isolates those labels. */ \
[&](){ \
ASSERT_THROW( \
store->parseStorePath(str), \
BadStorePath); \
}(); \
std::string name { STR }; \
[&](){ \
ASSERT_THROW( \
nix::checkName(name), \
BadStorePathName); \
}(); \
EXPECT_FALSE(std::regex_match(name, nameRegex)); \
}
@ -54,6 +63,7 @@ TEST_DONT_PARSE(dot_dash_a, ".-a")
STORE_DIR HASH_PART "-" STR; \
auto p = store->parseStorePath(str); \
std::string name { p.name() }; \
EXPECT_EQ(p.name(), STR); \
EXPECT_TRUE(std::regex_match(name, nameRegex)); \
}