Static file sync fails when server rendering to disk

[moorereason]

When running Hugo HEAD as follows:

hugo server --renderToDisk

Changes to static content are not synced to the public folder. Strangely enough, however, hugo detects it and says it's synced. The issue occurs when changing items in the base static directory and also in a theme's static directory.

The issue is not present when rendering to memory.

hugo server --renderToDisk -v
INFO: 2016/02/11 Using config file: /site/config.toml
INFO: 2016/02/11 using a UnionFS for static directory comprised of:
INFO: 2016/02/11 Base: /site/themes/hcgu-v0/static
INFO: 2016/02/11 Overlay: /site/static/
INFO: 2016/02/11 syncing static files to /site/public/
INFO: 2016/02/11 found taxonomies: map[string]string{"category":"categories", "tag":"tags"}
WARN: 2016/02/11 "" is rendered empty
WARN: 2016/02/11 "404.html" is rendered empty
0 draft content
0 future content
4 pages created
0 non-page files copied
0 paginator pages created
0 tags created
0 categories created
in 20 ms
Watching for changes in /site/{data,content,layouts,static,themes}
Serving pages from /site/public
Web Server is available at http://localhost:1313/ (bind address 127.0.0.1)
Press Ctrl+C to stop
INFO: 2016/02/11 Received System Events: ["/site/themes/hcgu-v0/sass/_layout.scss": WRITE "/site/themes/hcgu-v0/sass/_layout.scss": WRITE "/site/themes/hcgu-v0/static/css/app.css": WRITE "/site/themes/hcgu-v0/static/css/app.css": WRITE "/site/themes/hcgu-v0/sass/_layout.scss": CHMOD]

Static file changes detected
2016-02-11 17:34 -0600
INFO: 2016/02/11 using a UnionFS for static directory comprised of:
INFO: 2016/02/11 Base: /site/themes/hcgu-v0/static
INFO: 2016/02/11 Overlay: /site/static/
Syncing /css/app.css to /site/public/

Change detected, rebuilding site
2016-02-11 17:34 -0600
Template changed /site/themes/hcgu-v0/sass/_layout.scss
WARN: 2016/02/11 "" is rendered empty
WARN: 2016/02/11 "404.html" is rendered empty
0 draft content
0 future content
4 pages created
0 non-page files copied
0 paginator pages created
0 categories created
0 tags created
in 25 ms

In the above example, I'm expecting /site/themes/hcgu-v0/static/css/app.css to be copied into /site/public/css/app.css. I checked md5sums of the file before and after, and the file is unchanged.

[bep]

I have tested this briefly:

• this works fine on OS X
• it doesn't work in Windows
• in the tests I have been doing it seems that the OS X changes have been a DELETE followed by CREATE, Windows one MODIFY.
• If you delete the target file it gets synced over

No idea.

[bep]

I see this on OS X also now (I had a old Hugo site with the -d option set and edit CSS on the fly didn't work. Removing the "-d" (destionation => render to mem instead) fixed it.

[bep]

I have opened up a couple of related Fsync pull requests; the first one fixes this issue.

/cc @spf13

[github-actions]

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