dvc: add size/nfiles for deps/outs

dvc/cache/base.py

@@ -227,7 +227,7 @@ def _save_file(self, path_info, tree, hash_info, save_link=True, **kwargs):
             # we need to update path and cache, since in case of reflink,
             # or copy cache type moving original file results in updates on
             # next executed command, which causes md5 recalculation
-            self.tree.state.save(path_info, hash_info.value)
+            self.tree.state.save(path_info, hash_info)
         else:
             if self.changed_cache(hash_info):
                 with tree.open(path_info, mode="rb") as fobj:
@@ -241,7 +241,7 @@ def _save_file(self, path_info, tree, hash_info, save_link=True, **kwargs):
                 if callback:
                     callback(1)
 
-        self.tree.state.save(cache_info, hash_info.value)
+        self.tree.state.save(cache_info, hash_info)
 
     def _cache_is_copy(self, path_info):
         """Checks whether cache uses copies."""
@@ -287,6 +287,7 @@ def _get_dir_info_hash(self, dir_info):
         hash_info = self.tree.get_file_hash(to_info)
         hash_info.value += self.tree.CHECKSUM_DIR_SUFFIX
         hash_info.dir_info = self._to_dict(dir_info)
+        hash_info.nfiles = len(dir_info)
 
         return hash_info, to_info
 
@@ -305,7 +306,7 @@ def save_dir_info(self, dir_info, hash_info=None):
             self.tree.makedirs(new_info.parent)
             self.tree.move(tmp_info, new_info, mode=self.CACHE_MODE)
 
-        self.tree.state.save(new_info, hi.value)
+        self.tree.state.save(new_info, hi)
 
         return hi
 
@@ -326,10 +327,10 @@ def _save_dir(self, path_info, tree, hash_info, save_link=True, **kwargs):
         if save_link:
             self.tree.state.save_link(path_info)
         if self.tree.exists(path_info):
-            self.tree.state.save(path_info, hi.value)
+            self.tree.state.save(path_info, hi)
 
         cache_info = self.tree.hash_to_path_info(hi.value)
-        self.tree.state.save(cache_info, hi.value)
+        self.tree.state.save(cache_info, hi)
 
     @use_state
     def save(self, path_info, tree, hash_info, save_link=True, **kwargs):
@@ -461,7 +462,7 @@ def _checkout_file(
 
         self.link(cache_info, path_info)
         self.tree.state.save_link(path_info)
-        self.tree.state.save(path_info, hash_info.value)
+        self.tree.state.save(path_info, hash_info)
         if progress_callback:
             progress_callback(str(path_info))
 
@@ -501,7 +502,7 @@ def _checkout_dir(
                 modified = True
                 self.safe_remove(entry_info, force=force)
                 self.link(entry_cache_info, entry_info)
-                self.tree.state.save(entry_info, entry_hash)
+                self.tree.state.save(entry_info, entry_hash_info)
             if progress_callback:
                 progress_callback(str(entry_info))
 
@@ -511,7 +512,7 @@ def _checkout_dir(
         )
 
         self.tree.state.save_link(path_info)
-        self.tree.state.save(path_info, hash_info.value)
+        self.tree.state.save(path_info, hash_info)
 
         # relink is not modified, assume it as nochange
         return added, not added and modified and not relink
@@ -690,9 +691,20 @@ def _merge_dirs(self, ancestor_info, our_info, their_info):
 
         # Sorting the list by path to ensure reproducibility
         return sorted(
-            self._from_dict(merged), key=itemgetter(self.tree.PARAM_RELPATH)
+            self._from_dict(merged), key=itemgetter(self.tree.PARAM_RELPATH),
         )
 
+    def _get_dir_size(self, dir_info):
+        def _getsize(entry):
+            return self.tree.getsize(
+                self.tree.hash_to_path_info(entry[self.tree.PARAM_CHECKSUM])
+            )
+
+        try:
+            return sum(_getsize(entry) for entry in dir_info)
+        except FileNotFoundError:
+            return None
+
     def merge(self, ancestor_info, our_info, their_info):
         assert our_info
         assert their_info
@@ -706,7 +718,9 @@ def merge(self, ancestor_info, our_info, their_info):
         their = self.get_dir_cache(their_info)
 
         merged = self._merge_dirs(ancestor, our, their)
-        return self.save_dir_info(merged)
+        hash_info = self.save_dir_info(merged)
+        hash_info.size = self._get_dir_size(merged)
+        return hash_info
 
     @use_state
     def get_hash(self, tree, path_info):
@@ -715,9 +729,12 @@ def get_hash(self, tree, path_info):
             assert hash_info.name == self.tree.PARAM_CHECKSUM
             return hash_info
 
-        return self.save_dir_info(hash_info.dir_info, hash_info)
+        hi = self.save_dir_info(hash_info.dir_info, hash_info)
+        hi.size = hash_info.size
+        return hi
 
     def set_dir_info(self, hash_info):
         assert hash_info.isdir
 
         hash_info.dir_info = self._to_dict(self.get_dir_cache(hash_info))
+        hash_info.nfiles = len(hash_info.dir_info)

dvc/cache/local.py

@@ -451,7 +451,8 @@ def pull(self, named_cache, remote, jobs=None, show_checksums=False):
                     # be removed upon status, while files corrupted during
                     # download will not be moved from tmp_file
                     # (see `BaseTree.download()`)
-                    self.tree.state.save(cache_file, checksum)
+                    hash_info = HashInfo(self.tree.PARAM_CHECKSUM, checksum)
+                    self.tree.state.save(cache_file, hash_info)
 
         return ret
 

dvc/hash_info.py

@@ -1,26 +1,46 @@
+from collections import OrderedDict
 from dataclasses import dataclass, field
 
 HASH_DIR_SUFFIX = ".dir"
 
 
 @dataclass
 class HashInfo:
+    PARAM_SIZE = "size"
+    PARAM_NFILES = "nfiles"
+
     name: str
     value: str
     dir_info: dict = field(default=None, compare=False)
+    size: int = field(default=None, compare=False)
+    nfiles: int = field(default=None, compare=False)
 
     def __bool__(self):
         return bool(self.value)
 
     @classmethod
     def from_dict(cls, d):
-        if not d:
+        _d = d.copy() if d else {}
+        size = _d.pop(cls.PARAM_SIZE, None)
+        nfiles = _d.pop(cls.PARAM_NFILES, None)
+
+        if not _d:
             return cls(None, None)
-        ((name, value),) = d.items()
-        return cls(name, value)
+
+        ((name, value),) = _d.items()
+        return cls(name, value, size=size, nfiles=nfiles)
 
     def to_dict(self):
-        return {self.name: self.value} if self else {}
+        ret = OrderedDict()
+        if not self:
+            return ret
+
+        ret[self.name] = self.value
+        if self.size is not None:
+            ret[self.PARAM_SIZE] = self.size
+        if self.nfiles is not None:
+            ret[self.PARAM_NFILES] = self.nfiles
+        return ret
 
     @property
     def isdir(self):

dvc/output/__init__.py

@@ -4,6 +4,7 @@
 from funcy import collecting, project
 from voluptuous import And, Any, Coerce, Length, Lower, Required, SetTo
 
+from dvc.hash_info import HashInfo
 from dvc.output.base import BaseOutput
 from dvc.output.gs import GSOutput
 from dvc.output.hdfs import HDFSOutput
@@ -59,6 +60,8 @@
 SCHEMA[BaseOutput.PARAM_METRIC] = BaseOutput.METRIC_SCHEMA
 SCHEMA[BaseOutput.PARAM_PLOT] = bool
 SCHEMA[BaseOutput.PARAM_PERSIST] = bool
+SCHEMA[HashInfo.PARAM_SIZE] = int
+SCHEMA[HashInfo.PARAM_NFILES] = int
 
 
 def _get(

dvc/output/base.py

@@ -530,8 +530,15 @@ def _check_can_merge(self, out):
         my = self.dumpd()
         other = out.dumpd()
 
-        my.pop(self.tree.PARAM_CHECKSUM)
-        other.pop(self.tree.PARAM_CHECKSUM)
+        ignored = [
+            self.tree.PARAM_CHECKSUM,
+            HashInfo.PARAM_SIZE,
+            HashInfo.PARAM_NFILES,
+        ]
+
+        for opt in ignored:
+            my.pop(opt, None)
+            other.pop(opt, None)
 
         if my != other:
             raise MergeError(

dvc/schema.py

@@ -1,6 +1,7 @@
 from voluptuous import Any, Optional, Required, Schema
 
 from dvc import dependency, output
+from dvc.hash_info import HashInfo
 from dvc.output import CHECKSUMS_SCHEMA, BaseOutput
 from dvc.parsing import FOREACH_KWD, IN_KWD, SET_KWD, USE_KWD, VARS_KWD
 from dvc.stage.params import StageParams
@@ -18,7 +19,12 @@
     StageParams.PARAM_ALWAYS_CHANGED: bool,
 }
 
-DATA_SCHEMA = {**CHECKSUMS_SCHEMA, Required("path"): str}
+DATA_SCHEMA = {
+    **CHECKSUMS_SCHEMA,
+    Required("path"): str,
+    HashInfo.PARAM_SIZE: int,
+    HashInfo.PARAM_NFILES: int,
+}
 LOCK_FILE_STAGE_SCHEMA = {
     Required(StageParams.PARAM_CMD): str,
     StageParams.PARAM_DEPS: [DATA_SCHEMA],

dvc/stage/cache.py

@@ -25,9 +25,13 @@ def __init__(self, stage):
 
 
 def _get_cache_hash(cache, key=False):
+    from dvc.hash_info import HashInfo
+
     if key:
         cache["outs"] = [out["path"] for out in cache.get("outs", [])]
-    return dict_sha256(cache)
+    return dict_sha256(
+        cache, exclude=[HashInfo.PARAM_SIZE, HashInfo.PARAM_NFILES]
+    )
 
 
 def _get_stage_hash(stage):

dvc/stage/serialize.py

@@ -134,18 +134,18 @@ def to_pipeline_file(stage: "PipelineStage"):
 def to_single_stage_lockfile(stage: "Stage") -> dict:
     assert stage.cmd
 
+    def _dumpd(item):
+        ret = [
+            (item.PARAM_PATH, item.def_path),
+            *item.hash_info.to_dict().items(),
+        ]
+
+        return OrderedDict(ret)
+
     res = OrderedDict([("cmd", stage.cmd)])
     params, deps = split_params_deps(stage)
     deps, outs = [
-        [
-            OrderedDict(
-                [
-                    (PARAM_PATH, item.def_path),
-                    *item.hash_info.to_dict().items(),
-                ]
-            )
-            for item in sort_by_path(items)
-        ]
+        [_dumpd(item) for item in sort_by_path(items)]
         for items in [deps, stage.outs]
     ]
     params = _serialize_params_values(params)

dvc/stage/utils.py

@@ -8,6 +8,7 @@
 from dvc.utils.fs import path_isin
 
 from ..dependency import ParamsDependency
+from ..hash_info import HashInfo
 from ..tree.local import LocalTree
 from ..tree.s3 import S3Tree
 from ..utils import dict_md5, format_link, relpath
@@ -136,6 +137,8 @@ def stage_dump_eq(stage_cls, old_d, new_d):
     for out in outs:
         out.pop(LocalTree.PARAM_CHECKSUM, None)
         out.pop(S3Tree.PARAM_CHECKSUM, None)
+        out.pop(HashInfo.PARAM_SIZE, None)
+        out.pop(HashInfo.PARAM_NFILES, None)
 
     # outs and deps are lists of dicts. To check equality, we need to make
     # them independent of the order, so, we convert them to dicts.
@@ -171,6 +174,8 @@ def compute_md5(stage):
             stage.PARAM_FROZEN,
             BaseOutput.PARAM_METRIC,
             BaseOutput.PARAM_PERSIST,
+            HashInfo.PARAM_SIZE,
+            HashInfo.PARAM_NFILES,
         ],
     )