[[!comment format=mdwn
 username="m15"
 avatar="http://cdn.libravatar.org/avatar/a8c5fb405daff5f9c0c15209a3df4a4d"
 subject="bug report"
 date="2021-01-23T08:52:14Z"
 content="""
```
ENV:
macOS 10.14.6, installed by 'brew install git-annex'
git annex version
git-annex version: 8.20201129
build flags: Assistant Webapp Pairing FsEvents TorrentParser MagicMime Feeds Testsuite S3 WebDAV
dependency versions: aws-0.22 bloomfilter-2.0.1.0 cryptonite-0.27 DAV-1.3.4 feed-1.3.0.1 ghc-8.10.3 http-client-0.7.3 persistent-sqlite-2.11.0.0 torrent-10000.1.1 uuid-1.3.13 yesod-1.6.1.0
key/value backends: SHA256E SHA256 SHA512E SHA512 SHA224E SHA224 SHA384E SHA384 SHA3_256E SHA3_256 SHA3_512E SHA3_512 SHA3_224E SHA3_224 SHA3_384E SHA3_384 SKEIN256E SKEIN256 SKEIN512E SKEIN512 BLAKE2B256E BLAKE2B256 BLAKE2B512E BLAKE2B512 BLAKE2B160E BLAKE2B160 BLAKE2B224E BLAKE2B224 BLAKE2B384E BLAKE2B384 BLAKE2BP512E BLAKE2BP512 BLAKE2S256E BLAKE2S256 BLAKE2S160E BLAKE2S160 BLAKE2S224E BLAKE2S224 BLAKE2SP256E BLAKE2SP256 BLAKE2SP224E BLAKE2SP224 SHA1E SHA1 MD5E MD5 WORM URL X*
remote types: git gcrypt p2p S3 bup directory rsync web bittorrent webdav adb tahoe glacier ddar git-lfs httpalso borg hook external
operating system: darwin x86_64
supported repository versions: 8
upgrade supported from repository versions: 0 1 2 3 4 5 6 7


STEPS:
File copied to git (git-annex) repo's dir  (did not 'git add' 'git annex add')
name: 'f.mp4'
Now run 'git annex addurl' (via Python, see below)

RESULT: (same if run in bash)
File \"/opt/anaconda3/lib/python3.7/subprocess.py\", line 512, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['git', 'annex', 'addurl', '--file=f.mp4', '--raw', '--relaxed', 'https://www.youtube.com/watch?v=U33dsEcKgeQ']' returned non-zero exit status 1.

The command works after doing 'git annex add f.mp4' first
  but it results in a backend not 'URL backend for youtube'
  I'd like to use 'URL backend for youtube' cause I worry about youtube-video binay-change, in which case all future download will fail backend verification.


NOTE:
command line taken from https://git-annex.branchable.com/tips/using_the_web_as_a_special_remote/

```

"""]]
