mvc

MVC - Mastro Version Control

A minimal data versioning tool in Golang.

TLDR:

• for each data asset keeps a manifest file that can be crawled and stored in a mastro catalogue.
• based on the commons.abstract.sources package - multiple connectors available
• meant to be runnable either locally or by a workflow manager (e.g. Argo-workflows)

Prerequisites

An mvc provider is available for the desired backend storage to be used for file versioning. Mind that a provider is defined as follows:

type MvcProvider interface {
	InitConnection(cfg *conf.Config) (MvcProvider, error)
	InitDataset(cmd *InitCmd)
	NewVersion(cmd *NewCmd)
	Add(cmd *AddCmd)
	AllVersions(cmd *VersionsCmd)
	LatestVersion(cmd *LatestCmd)
	OverwriteVersion(cmd *OverwriteCmd)
	DeleteVersion(cmd *DeleteCmd)
}

The mvc provider instantiates a mastro connector within the InitConnection function, as specified in the commons module.

Requirements

In order for mvc to work, a Mastro configuration file of kind mvc must be specified and referred to using the MVC_CONFIG variable, e.g.:

./mvc -h
required key MVC_CONFIG missing value

export MVC_CONFIG=$PWD/conf/example_s3.yml

where example_s3.yml refers to the public minio:

type: mvc
backend:
  name: public-minio-s3
  type: s3
  settings:
    region: us-east-1
    endpoint: play.min.io
    access-key-id: Q3AM3UQ867SPQQA43P2F
    secret-access-key: zuf+tfteSlswRu7BJ86wekitnifILbZam1KYY3TG
    use-ssl: true
    bucket: ""

Let us now list available versions for the path abcde:

./mvc versions -d abcde
2021/06/10 14:44:58 Successfully loaded config mvc public-minio-s3
2021/06/10 14:44:58 Successfully validated data source definition
2021/06/10 14:44:58 Using provided region us-east-1
[1623324009]

Usage

Manifest creation

• mvc init -d $PATH - initializes local metadata file (i.e. manifest) for an asset located at $PATH
• mvc init -d $PATH -f $MANIFESTPATH - uploads manifest file located at $MANIFESTPATH at $PATH

Version management

• mvc new -d $PATH - creates new version and returns full path at $PATH
• mvc versions -d $PATH - retrieves all available versions at $PATH and shows their metadata
• mvc latest -d $PATH - retrieves latest version at $PATH
• mvc delete -d $PATH -v $VERSION - deletes the specified version and updates the metadata

File management

• mvc add -l $LOCALPATH -d $PATH - adds $LOCALPATH to remote $PATH at current latest version, includes the sha256 in the version metadata
• mvc overwrite -d $PATH -v $VERSION -l $LOCALPATH - overwrite existing version $VERSION at $PATH and overwrites metadata

Checksum

• mvc check -l $LOCALPATH - computes the sha256sum of the entire folder at $LOCALPATH