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Avoid downloading in some cases

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Depending on how on_conflict is set, we can determine a few situations where
downloading is never necessary.
This commit is contained in:
Joscha 2021-05-25 15:12:07 +02:00
parent 486699cef3
commit 980578d05a
1 changed files with 23 additions and 6 deletions
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29
PFERD/output_dir.py
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@ -197,13 +197,30 @@ class OutputDirectory:
local_path: Path,
heuristics: Heuristics,
redownload: Redownload,
on_conflict: OnConflict,
) -> bool:
# If we don't have a *file* at the local path, we'll always redownload
# since we know that the remote is different from the local files. This
# includes the case where no local file exists.
if not local_path.is_file():
if not local_path.exists():
log.explain("No corresponding file present locally")
# TODO Don't download if on_conflict is LOCAL_FIRST or NO_DELETE
return True
if on_conflict == OnConflict.LOCAL_FIRST:
# Whatever is here, it will never be overwritten, so we don't need
# to download the file.
log.explain("Conflict resolution is 'local-first' and path exists")
return False
if not local_path.is_file():
# We know that there is *something* here that's not a file.
log.explain("Non-file (probably a directory) present locally")
# If on_conflict is LOCAL_FIRST or NO_DELETE, we know that it would
# never be overwritten. It also doesn't have any relevant stats to
# update. This means that we don't have to download the file
# because we'd just always throw it away again.
if on_conflict in {OnConflict.LOCAL_FIRST, OnConflict.NO_DELETE}:
log.explain(f"Conflict resolution is {on_conflict.value!r}")
return False
return True
log.explain(f"Redownload policy is {redownload.value}")
@ -363,7 +380,7 @@ class OutputDirectory:
self._report.mark(path)
if not self._should_download(local_path, heuristics, redownload):
if not self._should_download(local_path, heuristics, redownload, on_conflict):
return None
# Detect and solve local-dir-remote-file conflict