Is it possible to give access control on file level for a repository hosted in Stash? As per Stash's documentation, we can control permissions on global, project, repository and branch levels.
If it is not possible from Stash, is there an alternative for giving file level access control in GIT repo from GIT itself?
Have you seen my answer here?
Basically not at the moment, although it is technically possible as a plugin or pre-receive hook. Personally I would suggest you break your repositories into smaller modules and secure them that way.
Otherwise I've only ever seen this implemented in Gitolite, but it won't be possible to integrate that with Stash:
Hello! My name is Mark Askew and I am a Premier Support Engineer for products Bitbucket Server/Data Center, Fisheye & Crucible. Today, I want to bring the discussion that Jennifer, Matt, and ...
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