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More work is\npending, but I\u0027d like some feedback on the idea.\n\nTODO: dummystore clashes with DummyIO – what should we name it?\n      simulatedstore?\n\ndummystore is an EvalIO implementation plus extra builtins for Tvix that\naims to fulfill a similar function as --readonly-mode or --store\ndummy:// in C++ Nix: Evaluate as much Nix code as possible without\nwriting to disk or starting any builds while matching evaluated store\npaths.\n\nNotably, this should be enough to correctly evaluate most of nixpkgs.\nThis would enable us to run all our eval CI independently of a full tvix\nstore implementation. dummystore needs to be a separate crate so that\n//tvix/eval doesn\u0027t encode knowledge about how the store or hashing\nworks (nor incurs a dependency on nix-compat etc.).\n\nIts EvalIO backend works like this:\n\n- store_dir() returns a preconfigured path that may or may not actually\n  exist.\n- import_path() is simulated, i.e. it returns what the store path would\n  be without actually copying anything.\n- All other methods dispatch to the StdIO methods, but fail if the\n  requested path is below store_dir(). This effectively prevents\n  IfD since it can\u0027t be performed without actually realising\n  derivations. 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More work is\npending, but I\u0027d like some feedback on the idea.\n\nTODO: dummystore clashes with DummyIO – what should we name it?\n      simulatedstore?\n\ndummystore is an EvalIO implementation plus extra builtins for Tvix that\naims to fulfill a similar function as --readonly-mode or --store\ndummy:// in C++ Nix: Evaluate as much Nix code as possible without\nwriting to disk or starting any builds while matching evaluated store\npaths.\n\nNotably, this should be enough to correctly evaluate most of nixpkgs.\nThis would enable us to run all our eval CI independently of a full tvix\nstore implementation. dummystore needs to be a separate crate so that\n//tvix/eval doesn\u0027t encode knowledge about how the store or hashing\nworks (nor incurs a dependency on nix-compat etc.).\n\nIts EvalIO backend works like this:\n\n- store_dir() returns a preconfigured path that may or may not actually\n  exist.\n- import_path() is simulated, i.e. it returns what the store path would\n  be without actually copying anything.\n- All other methods dispatch to the StdIO methods, but fail if the\n  requested path is below store_dir(). 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Another worthy\ngoal is to get simstore into a shape that allows using it with tvixbolt (or\nat least a subset of it).\n\nWe use the name simulated store/simstore to distinguish it from tvix-eval\u0027s\nDummyIO which does nothing.\n\nChange-Id: I38411f8ac8e514f179291dc23d2557621f844208\n","web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d70a49f5bd1e458f132c0a0fe6436a8fd78a83a97"}],"resolve_conflicts_web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d70a49f5bd1e458f132c0a0fe6436a8fd78a83a97"}]},"parents_data":[{"branch_name":"refs/heads/canon","commit_id":"675653ad6f86a2dd821464f17ebcf19e7bc066d8","is_merged_in_target_branch":true,"change_id":"Ia07f51f8e175ed3550f04dbfb540cc0aa25c9c6d","change_number":13388,"patch_set_number":4,"change_status":"MERGED"}],"branch":"refs/heads/canon"},"2785333b3186957747cc515ec3bc6dd40d8daf51":{"kind":"REWORK","_number":9,"created":"2025-05-08 14:10:33.000000000","uploader":{"_account_id":1000034,"name":"sterni","email":"sternenseemann@systemli.org","username":"sterni"},"ref":"refs/changes/64/12964/9","fetch":{"anonymous http":{"url":"https://cl.tvl.fyi/depot","ref":"refs/changes/64/12964/9","commands":{"Checkout":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/9 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/9 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/9 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://cl.tvl.fyi/depot refs/changes/64/12964/9"}}},"commit":{"parents":[{"commit":"675653ad6f86a2dd821464f17ebcf19e7bc066d8","subject":"chore(3p/sources): Bump channels \u0026 overlays (2025-05-06)","web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d675653ad6f86a2dd821464f17ebcf19e7bc066d8"}]}],"author":{"name":"sterni","email":"sternenseemann@systemli.org","date":"2025-01-09 14:13:02.000000000","tz":60},"committer":{"name":"sterni","email":"sternenseemann@systemli.org","date":"2025-05-08 14:10:29.000000000","tz":120},"subject":"feat(tvix/simstore): implement simulated EvalIO","message":"feat(tvix/simstore): implement simulated EvalIO\n\nThis implements an EvalIO interface that (contrary to StdIO) not only\nhandles access to files, but also calculates store paths in import_path()\nwithout actually performing any IO actions besides reading the files in\nquestion.\n\nThis feature is similar to C++ Nix --store dummy://. 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Another worthy\ngoal is to get simstore into a shape that allows using it with tvixbolt (or\nat least a subset of it).\n\nWe use the name simulated store/simstore to distinguish it from tvix-eval\u0027s\nDummyIO which does nothing.\n\nChange-Id: I38411f8ac8e514f179291dc23d2557621f844208\n","web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d2785333b3186957747cc515ec3bc6dd40d8daf51"}],"resolve_conflicts_web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d2785333b3186957747cc515ec3bc6dd40d8daf51"}]},"parents_data":[{"branch_name":"refs/heads/canon","commit_id":"675653ad6f86a2dd821464f17ebcf19e7bc066d8","is_merged_in_target_branch":true,"change_id":"Ia07f51f8e175ed3550f04dbfb540cc0aa25c9c6d","change_number":13388,"patch_set_number":4,"change_status":"MERGED"}],"branch":"refs/heads/canon"},"ed6def306e9169a2d27be29c68d2c46096b62c7d":{"kind":"REWORK","_number":10,"created":"2025-05-08 21:59:12.000000000","uploader":{"_account_id":1000034,"name":"sterni","email":"sternenseemann@systemli.org","username":"sterni"},"ref":"refs/changes/64/12964/10","fetch":{"anonymous http":{"url":"https://cl.tvl.fyi/depot","ref":"refs/changes/64/12964/10","commands":{"Checkout":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/10 \u0026\u0026 git checkout FETCH_HEAD","Cherry Pick":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/10 \u0026\u0026 git cherry-pick FETCH_HEAD","Format Patch":"git fetch https://cl.tvl.fyi/depot refs/changes/64/12964/10 \u0026\u0026 git format-patch -1 --stdout FETCH_HEAD","Pull":"git pull https://cl.tvl.fyi/depot refs/changes/64/12964/10"}}},"commit":{"parents":[{"commit":"675653ad6f86a2dd821464f17ebcf19e7bc066d8","subject":"chore(3p/sources): Bump channels \u0026 overlays (2025-05-06)","web_links":[{"name":"cgit","tooltip":"Open in GitWeb","url":"https://code.tvl.fyi/commit/?id\u003d675653ad6f86a2dd821464f17ebcf19e7bc066d8"}]}],"author":{"name":"sterni","email":"sternenseemann@systemli.org","date":"2025-01-09 14:13:02.000000000","tz":60},"committer":{"name":"sterni","email":"sternenseemann@systemli.org","date":"2025-05-08 21:58:50.000000000","tz":120},"subject":"feat(tvix/simstore): implement simulated EvalIO","message":"feat(tvix/simstore): implement simulated EvalIO\n\nThis implements an EvalIO interface that (contrary to StdIO) not only\nhandles access to files, but also calculates store paths in import_path()\nwithout actually performing any IO actions besides reading the files in\nquestion.\n\nThis feature is similar to C++ Nix --store dummy://. 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