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initial report asking to prevent adjusted branch migration or any other for that sake

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yarikoptic 2022-05-06 15:25:57 +00:00 • committed by admin
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### Please describe the problem.
Somewhat too late for our current usecase since older git-annex would not know about it, but I think could be generalized into adding a configuration variable right away for **any** automated migration. E.g. there is no variable to prevent autoupgrades of the repos (e.g. from v5 to the next one etc), but AFAIK there is none for automated conversion" into `adjusted/master(unlocked)` mode.
Rationale: With thaw/freeze commands we now can use git-annex in indirect (default) mode on our HPC. But that requires a recent version of git-annex. User might have some other (older) version of git-annex available system-wide by default, and if the user forgets to switch to new version of git-annex before using it, it might trigger git-annex to realize that it operates on crippled FS, and since not knowing about thaw/freeze -- it just migrates repository to adjusted, which is very undesired.
### What steps will reproduce the problem?
here is a demo of older git-annex going back to adjusted branch mode... yet to discover how else we could have migrated without directly invoking `git annex init`:
```
[d31548v@discovery7 d31548v]$ mkdir repo
[d31548v@discovery7 d31548v]$ cd repo
[d31548v@discovery7 repo]$ git init
Initialized empty Git repository in /dartfs/rc/lab/D/DBIC/DBIC/d31548v/repo/.git/
[d31548v@discovery7 repo]$ git config --add annex.thawcontent-command "$HOME/bin-annex/thaw-content %path"
[d31548v@discovery7 repo]$ git config --add annex.freezecontent-command "$HOME/bin-annex/freeze-content %path"
[d31548v@discovery7 repo]$ git annex init
init ok
(recording state in git...)
[d31548v@discovery7 repo]$ echo 123 > 123
[d31548v@discovery7 repo]$ git annex add 123
add 123
ok
(recording state in git...)
git comm[d31548v@discovery7 repo]$ git commit -m 'added 123 in indirect mode' 123
[master (root-commit) 3ceb200] added 123 in indirect mode
1 file changed, 1 insertion(+)
create mode 120000 123
[d31548v@discovery7 repo]$ ls -ld 123
lrwxr-x--- 1 d31548v rc-DBIC 178 May 6 11:19 123 -> .git/annex/objects/G6/qW/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b
[d31548v@discovery7 repo]$ ls -l .git/annex/objects
total 3
drwxr-x--- 3 d31548v rc-DBIC 20 May 6 11:19 G6
[d31548v@discovery7 repo]$ export PATH=/opt/bin:$PATH
[d31548v@discovery7 repo]$ git annex version | head -n 1
git-annex version: 8.20200502-g55acb2e52
[d31548v@discovery7 repo]$ git annex drop 123
drop 123
git-annex: failed to lock content: .git/annex/objects/G6/qW/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b: openFd: permission denied (Permission denied)
failed
git-annex: drop: 1 failed
[d31548v@discovery7 repo]$ git annex init
init
Filesystem allows writing to files whose write bit is not set.
Detected a crippled filesystem.
Disabling core.symlinks.
(scanning for unlocked files...)
Entering an adjusted branch where files are unlocked as this filesystem does not support locked files.
Switched to branch 'adjusted/master(unlocked)'
ok
```
[[!meta author=yoh]]
[[!tag projects/datalad]]