Module mounts with identical sources are not recursively copied to targets

[robbymilo]

What version of Hugo are you using (hugo version)?

hugo v0.92.0-B3549403+extended linux/amd64 BuildDate=2022-01-12T08:23:18Z VendorInfo=gohugoio

Does this issue reproduce with the latest release?

Yes.

What happened:
Added three (3) module mounts - two (2) have the same source, but different targets. In config.toml for example:

[[module.mounts]]
source = "content"
target = "content"

[[module.mounts]]
source = "extra-content"
target = "content/resources-a"

[[module.mounts]]
source = "extra-content"
target = "content/resources-b"

Note the extra-content dir contains subdirs, and the resulting public output:

What I expected to happened:
public/resources-b would also contain extra-content/subdir.

---

To reproduce with 0.92.0:

git clone [email protected]:robbymilo/hugo-bug.git
cd hugo-bug && git chceckout module-mounts
hugo
ls -Ral public/resources*

You will see the difference between
public/resources-a and
public/resources-b.

public/resources-a contains the subdirs for extra-content, while public/resources-b does not.

[jmooring]

Confirmed. MRE:

git clone --single-branch -b hugo-github-issue-9426 https://github.com/jmooring/hugo-testing hugo-github-issue-9426
cd hugo-github-issue-9426
hugo && tree public

[bep]

Yea, that's a bug -- we throw away duplicate source directories when walking to prevent cyclic references (from symbolic links) ... I will look if that can be handled differently.

[github-actions]

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