remote: support legacy cache push/fetch

dvc/data_cloud.py

@@ -1,18 +1,18 @@
 """Manages dvc remotes that user can use with push/pull/status commands."""
 
 import logging
-from typing import TYPE_CHECKING, Iterable, Optional
+from typing import TYPE_CHECKING, Iterable, Optional, Set, Tuple
 
 from dvc.config import NoRemoteError, RemoteConfigError
 from dvc.utils.objects import cached_property
 from dvc_data.hashfile.db import get_index
+from dvc_data.hashfile.transfer import TransferResult
 
 if TYPE_CHECKING:
     from dvc.fs import FileSystem
     from dvc_data.hashfile.db import HashFileDB
     from dvc_data.hashfile.hash_info import HashInfo
     from dvc_data.hashfile.status import CompareStatusResult
-    from dvc_data.hashfile.transfer import TransferResult
 
 logger = logging.getLogger(__name__)
 
@@ -50,6 +50,21 @@ def legacy_odb(self) -> "HashFileDB":
         return get_odb(self.fs, path, hash_name="md5-dos2unix", **self.config)
 
 
+def _split_legacy_hash_infos(
+    hash_infos: Iterable["HashInfo"],
+) -> Tuple[Set["HashInfo"], Set["HashInfo"]]:
+    from dvc.cachemgr import LEGACY_HASH_NAMES
+
+    legacy = set()
+    default = set()
+    for hi in hash_infos:
+        if hi.name in LEGACY_HASH_NAMES:
+            legacy.add(hi)
+        else:
+            default.add(hi)
+    return legacy, default
+
+
 class DataCloud:
     """Class that manages dvc remotes.
 
@@ -167,14 +182,40 @@ def push(
                 By default remote from core.remote config option is used.
             odb: optional ODB to push to. Overrides remote.
         """
-        odb = odb or self.get_remote_odb(remote, "push")
+        if odb is not None:
+            return self._push(objs, jobs=jobs, odb=odb)
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        result = TransferResult(set(), set())
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "push", hash_name="md5-dos2unix")
+            t, f = self._push(legacy_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "push")
+            t, f = self._push(default_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        return result
+
+    def _push(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ) -> "TransferResult":
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return self.transfer(
-            self.repo.cache.local,
+            cache,
             odb,
             objs,
             jobs=jobs,
             dest_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
             validate_status=self._log_missing,
         )
 
@@ -194,14 +235,41 @@ def pull(
                 By default remote from core.remote config option is used.
             odb: optional ODB to pull from. Overrides remote.
         """
-        odb = odb or self.get_remote_odb(remote, "pull")
+        if odb is not None:
+            return self._pull(objs, jobs=jobs, odb=odb)
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        result = TransferResult(set(), set())
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "pull", hash_name="md5-dos2unix")
+            assert odb.hash_name == "md5-dos2unix"
+            t, f = self._pull(legacy_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "pull")
+            t, f = self._pull(default_objs, jobs=jobs, odb=odb)
+            result.transferred.update(t)
+            result.failed.update(f)
+        return result
+
+    def _pull(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ) -> "TransferResult":
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return self.transfer(
             odb,
-            self.repo.cache.local,
+            cache,
             objs,
             jobs=jobs,
             src_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
             verify=odb.verify,
             validate_status=self._log_missing,
         )
@@ -223,17 +291,49 @@ def status(
                 is used.
             odb: optional ODB to check status from. Overrides remote.
         """
+        from dvc_data.hashfile.status import CompareStatusResult
+
+        if odb is not None:
+            return self._status(objs, jobs=jobs, odb=odb)
+        result = CompareStatusResult(set(), set(), set(), set())
+        legacy_objs, default_objs = _split_legacy_hash_infos(objs)
+        if legacy_objs:
+            odb = self.get_remote_odb(remote, "status", hash_name="md5-dos2unix")
+            assert odb.hash_name == "md5-dos2unix"
+            o, m, n, d = self._status(legacy_objs, jobs=jobs, odb=odb)
+            result.ok.update(o)
+            result.missing.update(m)
+            result.new.update(n)
+            result.deleted.update(d)
+        if default_objs:
+            odb = self.get_remote_odb(remote, "status")
+            o, m, n, d = self._status(default_objs, jobs=jobs, odb=odb)
+            result.ok.update(o)
+            result.missing.update(m)
+            result.new.update(n)
+            result.deleted.update(d)
+        return result
+
+    def _status(
+        self,
+        objs: Iterable["HashInfo"],
+        *,
+        jobs: Optional[int] = None,
+        odb: "HashFileDB",
+    ):
         from dvc_data.hashfile.status import compare_status
 
-        if not odb:
-            odb = self.get_remote_odb(remote, "status")
+        if odb.hash_name == "md5-dos2unix":
+            cache = self.repo.cache.legacy
+        else:
+            cache = self.repo.cache.local
         return compare_status(
-            self.repo.cache.local,
+            cache,
             odb,
             objs,
             jobs=jobs,
             dest_index=get_index(odb),
-            cache_odb=self.repo.cache.local,
+            cache_odb=cache,
         )
 
     def get_url_for(self, remote, checksum):

dvc/repo/imports.py

@@ -1,5 +1,6 @@
 import logging
 import os
+from functools import partial
 from tempfile import TemporaryDirectory
 from typing import TYPE_CHECKING, List, Set, Tuple, Union
 
@@ -17,17 +18,18 @@
 
 def unfetched_view(
     index: "Index", targets: "TargetType", unpartial: bool = False, **kwargs
-) -> Tuple["IndexView", List["Dependency"]]:
+) -> Tuple["IndexView", "IndexView", List["Dependency"]]:
     """Return index view of imports which have not been fetched.
 
     Returns:
-        Tuple in the form (view, changed_deps) where changed_imports is a list
-        of import dependencies that cannot be fetched due to changed data
-        source.
+        Tuple in the form (legacy_view, view, changed_deps) where changed_imports is a
+        list of import dependencies that cannot be fetched due to changed data source.
     """
+    from dvc.cachemgr import LEGACY_HASH_NAMES
+
     changed_deps: List["Dependency"] = []
 
-    def need_fetch(stage: "Stage") -> bool:
+    def need_fetch(stage: "Stage", legacy: bool = False) -> bool:
         if not stage.is_import or (stage.is_partial_import and not unpartial):
             return False
 
@@ -40,10 +42,19 @@ def need_fetch(stage: "Stage") -> bool:
             changed_deps.append(dep)
             return False
 
-        return True
+        if out.hash_name in LEGACY_HASH_NAMES and legacy:
+            return True
+        if out.hash_name not in LEGACY_HASH_NAMES and not legacy:
+            return True
+        return False
 
+    legacy_unfetched = index.targets_view(
+        targets,
+        stage_filter=partial(need_fetch, legacy=True),
+        **kwargs,
+    )
     unfetched = index.targets_view(targets, stage_filter=need_fetch, **kwargs)
-    return unfetched, changed_deps
+    return legacy_unfetched, unfetched, changed_deps
 
 
 def partial_view(index: "Index", targets: "TargetType", **kwargs) -> "IndexView":
@@ -94,33 +105,36 @@ def save_imports(
 
     downloaded: Set["HashInfo"] = set()
 
-    unfetched, changed = unfetched_view(
+    legacy_unfetched, unfetched, changed = unfetched_view(
         repo.index, targets, unpartial=unpartial, **kwargs
     )
     for dep in changed:
         logger.warning(str(DataSourceChanged(f"{dep.stage} ({dep})")))
 
-    data_view = unfetched.data["repo"]
-    if len(data_view):
-        cache = repo.cache.local
-        if not cache.fs.exists(cache.path):
-            os.makedirs(cache.path)
-        with TemporaryDirectory(dir=cache.path) as tmpdir:
-            with Callback.as_tqdm_callback(
-                desc="Downloading imports from source",
-                unit="files",
-            ) as cb:
-                checkout(data_view, tmpdir, cache.fs, callback=cb, storage="remote")
-            md5(data_view)
-            save(data_view, odb=cache, hardlink=True)
-
-        downloaded.update(
-            entry.hash_info
-            for _, entry in data_view.iteritems()
-            if entry.meta is not None
-            and not entry.meta.isdir
-            and entry.hash_info is not None
-        )
+    for view, cache in [
+        (legacy_unfetched, repo.cache.legacy),
+        (unfetched, repo.cache.local),
+    ]:
+        data_view = view.data["repo"]
+        if len(data_view):
+            if not cache.fs.exists(cache.path):
+                os.makedirs(cache.path)
+            with TemporaryDirectory(dir=cache.path) as tmpdir:
+                with Callback.as_tqdm_callback(
+                    desc="Downloading imports from source",
+                    unit="files",
+                ) as cb:
+                    checkout(data_view, tmpdir, cache.fs, callback=cb, storage="remote")
+                md5(data_view, name=cache.hash_name)
+                save(data_view, odb=cache, hardlink=True)
+
+            downloaded.update(
+                entry.hash_info
+                for _, entry in data_view.iteritems()
+                if entry.meta is not None
+                and not entry.meta.isdir
+                and entry.hash_info is not None
+            )
 
     if unpartial:
         unpartial_imports(partial_view(repo.index, targets, **kwargs))

dvc/repo/index.py

@@ -150,6 +150,7 @@ def _load_data_from_outs(index, prefix, outs):
 
 
 def _load_storage_from_out(storage_map, key, out):
+    from dvc.cachemgr import LEGACY_HASH_NAMES
     from dvc.config import NoRemoteError
     from dvc_data.index import FileStorage, ObjectStorage
 
@@ -168,7 +169,10 @@ def _load_storage_from_out(storage_map, key, out):
                 )
             )
         else:
-            storage_map.add_remote(ObjectStorage(key, remote.odb, index=remote.index))
+            odb = (
+                remote.legacy_odb if out.hash_name in LEGACY_HASH_NAMES else remote.odb
+            )
+            storage_map.add_remote(ObjectStorage(key, odb, index=remote.index))
     except NoRemoteError:
         pass