git-annex/doc/bugs/dropkey_-z_does_not_drop_etc.mdwn

### Please describe the problem.

```
❯ ( source ~/git-annexes/10.20230407+git201-g5df89d58c7.env; git annex version | head -n 1; git annex findkeys --in here | git annex dropkey --force --batch -z ; )
git-annex version: 10.20230407+git201-g5df89d58c7-1~ndall+1
git-annex: <stdout>: commitBuffer: resource vanished (Broken pipe)
dropkey MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz
 ok
❯ ls -ld .git/annex/objects/**/*gz/MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz
-r-------- 1 yoh yoh 5663237 May 19 09:50 .git/annex/objects/V7/Pj/MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz/MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz
❯ ( source ~/git-annexes/10.20230407+git201-g5df89d58c7.env; git annex version | head -n 1; git annex findkeys --in here | git annex dropkey --force --batch  ; )
git-annex version: 10.20230407+git201-g5df89d58c7-1~ndall+1
git-annex: <stdout>: commitBuffer: resource vanished (Broken pipe)
dropkey MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz ok
❯ ls -ld .git/annex/objects/**/*gz/MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz
ls: cannot access '.git/annex/objects/**/*gz/MD5E-s5663237--4608ffbd6b78ce3a325eb338fa556589.nii.gz': No such file or directory

```

and also was reported on 10.20230407 to not return anything causing us to stall: [https://github.com/datalad/datalad/issues/7315#issuecomment-1554348911](https://github.com/datalad/datalad/issues/7315#issuecomment-1554348911).

[[!meta author=yoh]]
[[!tag projects/datalad]]


### What steps will reproduce the problem?


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


### Please provide any additional information below.

[[!format sh """
# If you can, paste a complete transcript of the problem occurring here.
# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log


# End of transcript or log.
"""]]

### Have you had any luck using git-annex before? (Sometimes we get tired of reading bug reports all day and a lil' positive end note does wonders)


> [[closing|done]] per my comments --[[Joey]]