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9bc96d0783
This patch makes it easy to fetch one or multiple files from a Secret in
the provisioner cluster to address two primary use cases:
1. Extract files into a temporary directory to provide to other tools.
2. Print one file to stdout.
For example, the secrets.yaml file necessary to reset a talos cluster is
printed to stdout in txtar format with one command:
holos kv get k2-talos
The output has the secret name as the comment, then the value of each key of the data
field is printed as the txtar name and data.
k2-talos-49546d9fd7
-- secrets.yaml --
...
Extracting all of the files in the secret is also simple:
holos kv get k2-talos | holos txtar
8:34PM INF txtar.go:94 writing: secrets.yaml version=0.43.0 header=k2-talos-49546d9fd7 path=secrets.yaml bytes=4841
Extracting one file to stdout is also simple:
holos kv get k2-talos | holos txtar --index=1