Please describe the problem.

Originally spotted in https://neurostars.org/t/updating-datalad-datasets/1154/11 and thought that the guy is just offline and that is why can't get those "web" links, but apparently there were no web links for that file, so the message like

Try making some of these repositories available:
    00000000-0000-0000-0000-000000000001 -- web
...

was a bit misleading. Here is the full whereis for that file (since then I've populated git-annex with urls, so if you would clone it you would get some http urls for web remote):

                              
$> git annex whereis sub-10159/anat/sub-10159_T1w.nii.gz
whereis sub-10159/anat/sub-10159_T1w.nii.gz (3 copies)
    00000000-0000-0000-0000-000000000001 -- web
    09ede57e-5ec2-484b-b6fb-8a632e5c7a4e -- [datalad-archives]
    41f07c30-3cfc-4de3-9fbc-84383f5156e6 -- yoh@smaug:/mnt/btrfs/datasets/datalad/crawl/openfmri/ds000030
                              
  datalad-archives: dl+archive:MD5E-s3920586194--f5ecaf1365ea031dd6c20d0f958ed69b.tgz#path=ds030_R1.0.0/sub-10159/anat/sub-10159_T1w.nii.gz&size=11637742
  datalad-archives: dl+archive:MD5E-s3920586194--f5ecaf1365ea031dd6c20d0f958ed69b.tgz/ds030_R1.0.0/sub-10159/anat/sub-10159_T1w.nii.gz#size=11637742
  datalad-archives: dl+archive:MD5E-s4347673658--836cb09310fa22f7d2112c7f81e6258b.tgz#path=ds000030/sub-10159/anat/sub-10159_T1w.nii.gz&size=11637742
  datalad-archives: dl+archive:MD5E-s4349211504--2fe25908e474d782e8963fd31d6fe4b5.zip#path=ds000030/sub-10159/anat/sub-10159_T1w.nii.gz&size=11637742
  datalad-archives: dl+archive:MD5E-s4802398120--ce2d215f336e6dfa282d69cc35beb80d.tgz#path=sub-10159/anat/sub-10159_T1w.nii.gz&size=11637742
ok

What version of git-annex are you using? On what operating system?

6.20180807+git63-gbafc55c4a-1~ndall+1

I think I've now understood and fixed this, so done --Joey