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Story #8459

Updated by ipanova@redhat.com over 3 years ago

# Problem Statement/Use cases: 

 * As    a user I might have content that I no longer need to serve but I want to keep it in the repo for history purposes. I want to still be able to free up some disk space in such case. 
 * As a user I have repos that have deferred download policy and I want to clear out downloaded files for those repos. A repository with deferred download policy will store artifacts locally after they have been requested, but there really isn't a way to have pulp delete the locally stored files and free disk space if these packages are unlikely to be used again. 

 # Solution 
 `pulp/api/v3/repositories/<reclaim-disk-space>/` 
 Provide a separate endpoint which will accept a list of repo hrefs    to reclaim disk space for.   
 * Artifacts only exclusively to that list of repos will be removed. No new versions will be created or removed because content set will not change. 
 * The task will only remove those Artifacts that have a corresponding Remote artifact.  
 * There, however, will be a `force` flag that will remove Artifacts that have no RA( aka uploaded content). This will **not** a default behavior. 
 * The task will trim Artifacts regardless of the download policy.  

 # Under 

 #Under discussion 
 Add `keeplist` option for repo_versions which will be excluded from artifact removal. This option will accept list of repo_version hrefs to keep.

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