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possibly dangerous behaviour of "-I" #351

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@xkcd386at

[Edit 3 days later: changed subject line from "confusing" to "potentially dangerous"]

Hi,

I have a very confusing situation. I'm sure I'm missing/misunderstanding something, and need help.

setup:

$ mkdir fclones-test
$ cd fclones-test
$ mkdir 1 2

1 unique file each:

$ echo apple > 1/a
$ echo banana > 2/b

1 set of duplicate files within each directory:

$ echo fruits     | tee 1/f1 | tee 1/f2
$ echo vegetables | tee 2/v1 | tee 2/v2

Plain group:

$ fclones group -s0 1 2
[...]
[2026-06-25 06:12:49.438] fclones:  info: Found 2 (18 B) redundant files
3912abff18c50ac6c875159a4eb5cf12, 11 B (11 B) * 2:
    /home/x3/fclones-test/2/v1
    /home/x3/fclones-test/2/v2
6102df57fabc00d2a6be19c176b3e634, 7 B (7 B) * 2:
    /home/x3/fclones-test/1/f1
    /home/x3/fclones-test/1/f2

No duplicates common to both directories, so -I should not print anything:

$ fclones group -s0 -I 1 2
[...]
[2026-06-25 06:12:55.154] fclones:  info: Found 0 (0 B) redundant files

So far, all good.

But if I start from within a directory, and use a relative name for the other:

$ cd 1

$ fclones group -s0 -I . ../2
[...]
[2026-06-25 06:13:26.257] fclones:  info: Found 2 (18 B) redundant files
3912abff18c50ac6c875159a4eb5cf12, 11 B (11 B) * 2:
    /home/x3/fclones-test/2/v1
    /home/x3/fclones-test/2/v2
6102df57fabc00d2a6be19c176b3e634, 7 B (7 B) * 2:
    /home/x3/fclones-test/1/f1
    /home/x3/fclones-test/1/f2

And instead of relative, I use an absolute directory for the other:

$ fclones group -s0 -I . ~/fclones-test/2
[...]
[2026-06-25 06:13:35.918] fclones:  info: Found 1 (7 B) redundant files
6102df57fabc00d2a6be19c176b3e634, 7 B (7 B) * 2:
    /home/x3/fclones-test/1/f1
    /home/x3/fclones-test/1/f2

I'm totally lost.

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