Seafile returns a content-addressed id (a git-like hash of the file
contents) rather than a unique per-object identifier. Two different
files with identical contents are therefore given the same id, even on
different servers.
operations.SameObject assumes IDs uniquely identify an object, so when
syncing between Seafile remotes it treated two distinct but
identical-content files as the same object. The guard in NeedTransfer
if Equal(ctx, src, dst) && !SameObject(src, dst)
then evaluated to false for unchanged files (Equal was true because the
sizes matched, and SameObject was true because the ids matched), so
rclone re-uploaded them on every sync.
Seafile has no modtime and no usable content hash, so dropping the IDer
implementation makes SameObject fall back to path comparison and lets
unchanged files be skipped correctly.
Fixes#8300
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
f2e43b7c14