[Bug 12036] New: Multiple --link-dest, --copy-dest, or --compare-dest flags produce incorrect behavior

[samba...@samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=12036

Bug ID: 12036
Summary: Multiple --link-dest, --copy-dest, or --compare-dest
flags produce incorrect behavior
Product: rsync
Version: 3.1.2
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: core
Assignee: way...@samba.org
Reporter: cku...@ocf.berkeley.edu
QA Contact: rsyn...@samba.org

Created attachment 12288
--> https://bugzilla.samba.org/attachment.cgi?id=12288&action=edit
reproduction

We have observed what seems like incorrect behavior when using a command like
this:

rsync -avc --link-dest=../copy_dest/good --link-dest=../copy_dest/bad src/
dest

with a directory stucture that looks like this:

.
├── copy_dest
│   ├── bad
│   │   └── file # contains different content from src, but same
attributes (e.g. mtime)
│   └── good
│   └── file # contains same content as src, but different
attributes (e.g. mtime)
└── src
└── file

Using the command above, we see that "bad/file" is hard-linked into "dest",
even though it is different from "file" in src.

I've attached repro.sh which reliably reproduces this for me on the latest
version of rsync.

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