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nix ls-{nar,store}: Return offset of files in the NAR if known

Browse source 
E.g.

  $ nix ls-store --json --recursive --store https://cache.nixos.org /nix/store/b0w2hafndl09h64fhb86kw6bmhbmnpm1-blender-2.79 \
    | jq .entries.bin.entries.blender.narOffset
  400
This commit is contained in:
Eelco Dolstra 2017-12-06 22:44:08 +01:00
parent ba334bd6f7
commit 338f29dbd4
3 changed files with 12 additions and 9 deletions
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7
src/libstore/fs-accessor.hh
View file

@ -13,9 +13,10 @@ public:
struct Stat
{
Type type;
uint64_t fileSize; // regular files only
bool isExecutable; // regular files only
Type type = tMissing;
uint64_t fileSize = 0; // regular files only
bool isExecutable = false; // regular files only
uint64_t narOffset = 0; // regular files only
};
virtual Stat stat(const Path & path) = 0;

10
src/libstore/nar-accessor.cc
View file

@ -10,13 +10,13 @@ namespace nix {
struct NarMember
{
FSAccessor::Type type;
FSAccessor::Type type = FSAccessor::Type::tMissing;
bool isExecutable;
bool isExecutable = false;
/* If this is a regular file, position of the contents of this
file in the NAR. */
size_t start, size;
size_t start = 0, size = 0;
std::string target;
@ -142,7 +142,7 @@ struct NarAccessor : public FSAccessor
auto i = indexer.find(path);
if (i == nullptr)
return {FSAccessor::Type::tMissing, 0, false};
return {i->type, i->size, i->isExecutable};
return {i->type, i->size, i->isExecutable, i->start};
}
StringSet readDirectory(const Path & path) override
@ -195,6 +195,8 @@ void listNar(JSONPlaceholder & res, ref<FSAccessor> accessor,
obj.attr("size", st.fileSize);
if (st.isExecutable)
obj.attr("executable", true);
if (st.narOffset)
obj.attr("narOffset", st.narOffset);
break;
case FSAccessor::Type::tDirectory:
obj.attr("type", "directory");

4
tests/nar-access.sh
View file

@ -27,8 +27,8 @@ diff -u baz.cat-nar $storePath/foo/baz
# Test --json.
[[ $(nix ls-nar --json $narFile /) = '{"type":"directory","entries":{"foo":{},"foo-x":{},"qux":{},"zyx":{}}}' ]]
[[ $(nix ls-nar --json -R $narFile /foo) = '{"type":"directory","entries":{"bar":{"type":"regular","size":0},"baz":{"type":"regular","size":0},"data":{"type":"regular","size":58}}}' ]]
[[ $(nix ls-nar --json -R $narFile /foo/bar) = '{"type":"regular","size":0}' ]]
[[ $(nix ls-nar --json -R $narFile /foo) = '{"type":"directory","entries":{"bar":{"type":"regular","size":0,"narOffset":368},"baz":{"type":"regular","size":0,"narOffset":552},"data":{"type":"regular","size":58,"narOffset":736}}}' ]]
[[ $(nix ls-nar --json -R $narFile /foo/bar) = '{"type":"regular","size":0,"narOffset":368}' ]]
[[ $(nix ls-store --json $storePath) = '{"type":"directory","entries":{"foo":{},"foo-x":{},"qux":{},"zyx":{}}}' ]]
[[ $(nix ls-store --json -R $storePath/foo) = '{"type":"directory","entries":{"bar":{"type":"regular","size":0},"baz":{"type":"regular","size":0},"data":{"type":"regular","size":58}}}' ]]
[[ $(nix ls-store --json -R $storePath/foo/bar) = '{"type":"regular","size":0}' ]]