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Feature Request: spack repo update command to manage remote git repos and switch refs

Feature Request: spack repo update command to manage remote git repos and switch refs: a task in LegoFlow-SWE (Harbor dataset). Problem Spack currently lets users add remote git repositories to their configuration via spack repo add , but there is no convenient way to update those repositories or…

The task

**Problem** Spack currently lets users add remote git repositories to their configuration via `spack repo add`, but there is no convenient way to update those repositories or switch to a different branch, tag, or commit without manually editing `repos.yaml` and juggling `git` commands. This makes it cumbersome to…

Part of Lego-X/LegoFlow-SWE.