I've seen this done in Cloud Foundry, for these reasons. Objects with identity, like a buildpack, are given a UUID. That UUID is stable, but the hash changes o

I've seen this done in Cloud Foundry, for these reasons. Objects with identity, like a buildpack, are given a UUID. That UUID is stable, but the hash changes on disk depending on the exact file uploaded (because you can replace buildpacks). File paths include both UUID and hash.