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Simplify getFlake() / fetchFlake() logic

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This commit is contained in:
Eelco Dolstra 2019-06-21 19:04:58 +02:00
parent aa2846198f
commit d4fe9daed6
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GPG key ID: 8170B4726D7198DE
4 changed files with 46 additions and 34 deletions
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50
src/libexpr/flake/flake.cc
View file

@ -89,9 +89,6 @@ FlakeRef updateFlakeRef(EvalState & state, const FlakeRef & newRef, const Regist
static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const Registries & registries,
std::vector<FlakeRef> pastSearches)
{
if (registries.empty() && !flakeRef.isDirect())
throw Error("indirect flake reference '%s' is not allowed", flakeRef);
for (std::shared_ptr<FlakeRegistry> registry : registries) {
auto i = registry->entries.find(flakeRef);
if (i != registry->entries.end()) {
@ -115,16 +112,24 @@ static FlakeRef lookupFlake(EvalState & state, const FlakeRef & flakeRef, const
return flakeRef;
}
// Lookups happen here too
static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
FlakeRef maybeLookupFlake(
EvalState & state,
const FlakeRef & flakeRef,
bool allowLookup)
{
FlakeRef resolvedRef = lookupFlake(state, flakeRef,
impureIsAllowed && !flakeRef.isDirect()
? state.getFlakeRegistries()
: std::vector<std::shared_ptr<FlakeRegistry>>());
if (!flakeRef.isDirect()) {
if (allowLookup)
return lookupFlake(state, flakeRef, state.getFlakeRegistries());
else
throw Error("'%s' is an indirect flake reference, but registry lookups are not allowed", flakeRef);
} else
return flakeRef;
}
if (evalSettings.pureEval && !impureIsAllowed && !resolvedRef.isImmutable())
throw Error("requested to fetch mutable flake '%s' in pure mode", resolvedRef);
static SourceInfo fetchFlake(EvalState & state, const FlakeRef & resolvedRef)
{
assert(resolvedRef.isDirect());
auto doGit = [&](const GitInfo & gitInfo) {
FlakeRef ref(resolvedRef.baseRef());
@ -190,10 +195,9 @@ static SourceInfo fetchFlake(EvalState & state, const FlakeRef & flakeRef, bool
else abort();
}
// This will return the flake which corresponds to a given FlakeRef. The lookupFlake is done within `fetchFlake`, which is used here.
Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
Flake getFlake(EvalState & state, const FlakeRef & flakeRef)
{
SourceInfo sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
SourceInfo sourceInfo = fetchFlake(state, flakeRef);
debug("got flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
FlakeRef resolvedRef = sourceInfo.resolvedRef;
@ -278,10 +282,9 @@ Flake getFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowe
return flake;
}
// Get the `NonFlake` corresponding to a `FlakeRef`.
NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef, bool impureIsAllowed = false)
NonFlake getNonFlake(EvalState & state, const FlakeRef & flakeRef)
{
auto sourceInfo = fetchFlake(state, flakeRef, impureIsAllowed);
auto sourceInfo = fetchFlake(state, flakeRef);
debug("got non-flake source '%s' with flakeref %s", sourceInfo.storePath, sourceInfo.resolvedRef.to_string());
FlakeRef resolvedRef = sourceInfo.resolvedRef;
@ -347,7 +350,7 @@ static std::pair<Flake, FlakeInput> updateLocks(
} else {
if (handleLockFile == AllPure || handleLockFile == TopRefUsesRegistries)
throw Error("cannot update non-flake dependency '%s' in pure mode", id);
auto nonFlake = getNonFlake(state, ref, allowedToUseRegistries(handleLockFile, false));
auto nonFlake = getNonFlake(state, maybeLookupFlake(state, ref, allowedToUseRegistries(handleLockFile, false)));
newEntry.nonFlakeInputs.insert_or_assign(id,
NonFlakeInput(
nonFlake.sourceInfo.resolvedRef,
@ -364,7 +367,7 @@ static std::pair<Flake, FlakeInput> updateLocks(
throw Error("cannot update flake dependency '%s' in pure mode", inputRef);
newEntry.flakeInputs.insert_or_assign(inputRef,
updateLocks(state,
getFlake(state, inputRef, allowedToUseRegistries(handleLockFile, false)),
getFlake(state, maybeLookupFlake(state, inputRef, allowedToUseRegistries(handleLockFile, false))),
handleLockFile, {}, false).second);
}
}
@ -376,7 +379,7 @@ static std::pair<Flake, FlakeInput> updateLocks(
and optionally write it to file, it the flake is writable. */
ResolvedFlake resolveFlake(EvalState & state, const FlakeRef & topRef, HandleLockFile handleLockFile)
{
auto flake = getFlake(state, topRef, allowedToUseRegistries(handleLockFile, true));
auto flake = getFlake(state, maybeLookupFlake(state, topRef, allowedToUseRegistries(handleLockFile, true)));
LockFile oldLockFile;
@ -441,7 +444,10 @@ static void emitSourceInfoAttrs(EvalState & state, const SourceInfo & sourceInfo
static void prim_callFlake(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
auto lazyFlake = (FlakeInput *) args[0]->attrs;
auto flake = getFlake(state, lazyFlake->ref, false);
assert(lazyFlake->ref.isImmutable());
auto flake = getFlake(state, lazyFlake->ref);
if (flake.sourceInfo.narHash != lazyFlake->narHash)
throw Error("the content hash of flake '%s' doesn't match the hash recorded in the referring lockfile", flake.sourceInfo.resolvedRef);
@ -453,6 +459,8 @@ static void prim_callNonFlake(EvalState & state, const Pos & pos, Value * * args
{
auto lazyNonFlake = (NonFlakeInput *) args[0]->attrs;
assert(lazyNonFlake->ref.isImmutable());
auto nonFlake = getNonFlake(state, lazyNonFlake->ref);
if (nonFlake.sourceInfo.narHash != lazyNonFlake->narHash)

9
src/libexpr/flake/flake.hh
View file

@ -81,7 +81,14 @@ struct NonFlake
: originalRef(origRef), sourceInfo(sourceInfo) {};
};
Flake getFlake(EvalState &, const FlakeRef &, bool impureIsAllowed);
Flake getFlake(EvalState &, const FlakeRef &);
/* If 'allowLookup' is true, then resolve 'flakeRef' using the
registries. */
FlakeRef maybeLookupFlake(
EvalState & state,
const FlakeRef & flakeRef,
bool allowLookup);
/* Fingerprint of a locked flake; used as a cache key. */
typedef Hash Fingerprint;

7
src/nix/flake.cc
View file

@ -38,7 +38,8 @@ public:
Flake getFlake()
{
auto evalState = getEvalState();
return flake::getFlake(*evalState, getFlakeRef(), useRegistries);
return flake::getFlake(*evalState,
maybeLookupFlake(*evalState, getFlakeRef(), useRegistries));
}
ResolvedFlake resolveFlake()
@ -425,13 +426,13 @@ struct CmdFlakePin : virtual Args, EvalCommand
FlakeRegistry userRegistry = *readRegistry(userRegistryPath);
auto it = userRegistry.entries.find(FlakeRef(alias));
if (it != userRegistry.entries.end()) {
it->second = getFlake(*evalState, it->second, true).sourceInfo.resolvedRef;
it->second = getFlake(*evalState, maybeLookupFlake(*evalState, it->second, true)).sourceInfo.resolvedRef;
writeRegistry(userRegistry, userRegistryPath);
} else {
std::shared_ptr<FlakeRegistry> globalReg = evalState->getGlobalFlakeRegistry();
it = globalReg->entries.find(FlakeRef(alias));
if (it != globalReg->entries.end()) {
auto newRef = getFlake(*evalState, it->second, true).sourceInfo.resolvedRef;
auto newRef = getFlake(*evalState, maybeLookupFlake(*evalState, it->second, true)).sourceInfo.resolvedRef;
userRegistry.entries.insert_or_assign(alias, newRef);
writeRegistry(userRegistry, userRegistryPath);
} else

14
tests/flakes.sh
View file

@ -107,9 +107,6 @@ cat > $registry <<EOF
"flake3": {
"uri": "file://$flake3Dir"
},
"file://$flake4Dir": {
"uri": "file://$flake3Dir"
},
"flake4": {
"uri": "flake3"
},
@ -122,7 +119,7 @@ cat > $registry <<EOF
EOF
# Test 'nix flake list'.
(( $(nix flake list --flake-registry $registry | wc -l) == 6 ))
(( $(nix flake list --flake-registry $registry | wc -l) == 5 ))
# Test 'nix flake info'.
nix flake info --flake-registry $registry flake1 | grep -q 'ID: *flake1'
@ -300,7 +297,6 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake3:xyzzy flake3:fn
# Test doing multiple `lookupFlake`s
nix build -o $TEST_ROOT/result --flake-registry $registry flake4:xyzzy
#nix build -o $TEST_ROOT/result --flake-registry $registry file://$flake4Dir:xyzzy
# Make branch "removeXyzzy" where flake3 doesn't have xyzzy anymore
git -C $flake3Dir checkout -b removeXyzzy
@ -347,11 +343,11 @@ nix build -o $TEST_ROOT/result --flake-registry $registry flake4/removeXyzzy:sth
# Testing the nix CLI
nix flake add --flake-registry $registry flake1 flake3
(( $(nix flake list --flake-registry $registry | wc -l) == 7 ))
nix flake pin --flake-registry $registry flake1
(( $(nix flake list --flake-registry $registry | wc -l) == 7 ))
nix flake remove --flake-registry $registry flake1
(( $(nix flake list --flake-registry $registry | wc -l) == 6 ))
nix flake pin --flake-registry $registry flake1
(( $(nix flake list --flake-registry $registry | wc -l) == 6 ))
nix flake remove --flake-registry $registry flake1
(( $(nix flake list --flake-registry $registry | wc -l) == 5 ))
(cd $flake7Dir && nix flake init)
nix flake --flake-registry $registry check $flake3Dir