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doc/bugs/addurl_+_metadata_on_Windows_doesn__39__t_work.mdwn
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(Sorry for the uninformative title, but I had to work within the character limit.)
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### Please describe the problem.
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`git-annex metadata` does nothing on Windows if invoked while `git-annex addurl` is in progress on other files.
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### What steps will reproduce the problem?
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On Windows (but not on Linux or macOS, where everything works fine):
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- Start `git-annex addurl` in batch mode
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- Feed it two or more URLs
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- After reading the completion message for a URL from addurl's stdout, but before reading the remaining output, run `git-annex metadata` in batch mode and try to set the metadata for the file that was just downloaded.
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- `git-annex metadata` will output an empty line (i.e., just CR LF), and if nothing further is fed to it, it will exit successfully without printing anything else on stdout or stderr.
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- Querying the file's metadata normally after `git-annex addurl` exits will show that no metadata was set for the file.
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The Python script at <https://github.com/jwodder/git-annex-bug-20221024/blob/master/mvce.py> (Python 3.8+ required) will run the above steps and show the output from `git-annex metadata`. A sample run under GitHub Actions can be seen at <https://github.com/jwodder/git-annex-bug-20221024/actions/runs/3322463020/jobs/5491516209>; note the following section of the output under "Run script":
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```
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16:04:04 [DEBUG ] __main__: Opening pipe to: git-annex metadata --batch --json --json-error-messages
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16:04:04 [DEBUG ] __main__: Input to metadata: b'{"file": "programming/gameboy.pdf", "fields": {"title": ["GameBoy Programming Manual"]}}\n'
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16:04:04 [DEBUG ] __main__: r.returncode=0
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16:04:04 [DEBUG ] __main__: r.stdout=b'\r\n'
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16:04:04 [DEBUG ] __main__: r.stderr=b''
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```
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This problem does not always occur, but it seems to occur most of the time. Using `git-annex registerurl` in place of `git-annex metadata` works fine.
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### What version of git-annex are you using? On what operating system?
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git-annex 10.20221003, provided by datalad/git-annex, on Microsoft Windows Server 2022
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### Please provide any additional information below.
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This affects a hobby project of mine – "gamdam", implemented in [Python](https://github.com/jwodder/gamdam) and [Rust](https://github.com/jwodder/gamdam-rust) — that interacts with git-annex.
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[[!meta author=jwodder]]
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