initial report asking to prevent adjusted branch migration or any other for that sake
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doc/bugs/add_config_var_preventing_adjusted_branch_mode.mdwn
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### Please describe the problem.
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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.
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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.
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### What steps will reproduce the problem?
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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`:
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```
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[d31548v@discovery7 d31548v]$ mkdir repo
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[d31548v@discovery7 d31548v]$ cd repo
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[d31548v@discovery7 repo]$ git init
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Initialized empty Git repository in /dartfs/rc/lab/D/DBIC/DBIC/d31548v/repo/.git/
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[d31548v@discovery7 repo]$ git config --add annex.thawcontent-command "$HOME/bin-annex/thaw-content %path"
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[d31548v@discovery7 repo]$ git config --add annex.freezecontent-command "$HOME/bin-annex/freeze-content %path"
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[d31548v@discovery7 repo]$ git annex init
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init ok
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(recording state in git...)
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[d31548v@discovery7 repo]$ echo 123 > 123
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[d31548v@discovery7 repo]$ git annex add 123
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add 123
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ok
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(recording state in git...)
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git comm[d31548v@discovery7 repo]$ git commit -m 'added 123 in indirect mode' 123
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[master (root-commit) 3ceb200] added 123 in indirect mode
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1 file changed, 1 insertion(+)
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create mode 120000 123
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[d31548v@discovery7 repo]$ ls -ld 123
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lrwxr-x--- 1 d31548v rc-DBIC 178 May 6 11:19 123 -> .git/annex/objects/G6/qW/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b
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[d31548v@discovery7 repo]$ ls -l .git/annex/objects
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total 3
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drwxr-x--- 3 d31548v rc-DBIC 20 May 6 11:19 G6
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[d31548v@discovery7 repo]$ export PATH=/opt/bin:$PATH
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[d31548v@discovery7 repo]$ git annex version | head -n 1
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git-annex version: 8.20200502-g55acb2e52
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[d31548v@discovery7 repo]$ git annex drop 123
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drop 123
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git-annex: failed to lock content: .git/annex/objects/G6/qW/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b/SHA256E-s4--181210f8f9c779c26da1d9b2075bde0127302ee0e3fca38c9a83f5b1dd8e5d3b: openFd: permission denied (Permission denied)
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failed
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git-annex: drop: 1 failed
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[d31548v@discovery7 repo]$ git annex init
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init
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Filesystem allows writing to files whose write bit is not set.
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Detected a crippled filesystem.
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Disabling core.symlinks.
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(scanning for unlocked files...)
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Entering an adjusted branch where files are unlocked as this filesystem does not support locked files.
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Switched to branch 'adjusted/master(unlocked)'
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ok
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```
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[[!meta author=yoh]]
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[[!tag projects/datalad]]
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