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quickstart.md

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Quickstart

This guide will walk you through the basics of using the gocfl applications.

Installation

The gocfl applications are available as a single binary. You can download the latest release from the releases page.

Alternatively, you can install the latest version with go install:

go install github.com/ocfl-archive/gocfl/v2/gocfl@latest

Initializing a new storage root

To initialize a new storage on an existing empty folder root, run the init command:

gocfl init ./storage_root
gocfl init ./ocfl.zip

Add a new object to an existing storage root

To add a new object to an existing storage root, run the add command:

gocfl add ./storage_root C:/temp/ocfltest1 -u 'Jane Doe' -a 'mailto:user@domain' -m 'initial add' --object-id 'id:abc123'
gocfl add ./ocfl.zip C:/temp/ocfltest1 -u 'Jane Doe' -a 'mailto:user@domain' -m 'initial add' --object-id 'id:abc123'

Adding a new version to an existing OCFL Repository

To add a new version to an existing OCFL Object, run the update command:

gocfl update ./storage_root /temp/ocfltest2 -u 'Jane Doe' -a 'mailto:user@domain' -m 'some new data' --object-id 'id:abc123'
gocfl update ./ocfl.zip /temp/ocfltest2 -u 'Jane Doe' -a 'mailto:user@domain' -m 'some new data' --object-id 'id:abc123'

This command adds a new version to the object id:abc123 located in the storage root archive.zip. The object contains the new or changed files from the directory /temp/ocfltest1. The digest is derived from the existing manifest.

By default, deduplication is performed. If you want to disable deduplication, use the --no-deduplicate flag (less I/O, faster).

Creating an OCFL Repository with one object

To create a new OCFL repository, run the create command:

gocfl create ./storage_root_create /temp/ocfltest1 --digest sha512 -u 'Jane Doe' -a 'mailto:user@domain' -m 'initial add' --object-id 'id:abc123'
gocfl create ./ocfl_create.zip /temp/ocfltest1 --digest sha512 -u 'Jane Doe' -a 'mailto:user@domain' -m 'initial add' --object-id 'id:abc123'

This command creates a zip file containing an ocfl storageroot with one object. The object-id is id:abc. The object contains the files from the directory /temp/ocfltest1. The digest algorithm used for the OCFL Manifest is sha512. As Metadata for the version v1, the user is Jane Doe, the email address is user@domain and the message is 'initial add'.

Instead of a zip file, you can also use a directory as target.

By default, no deduplication is performed. If you want to deduplicate the files, you can use the --deduplicate flag (more I/O, takes longer).

Using the --no-compress flag, you can disable compression of the files in the zip file.

Validating an OCFL Storage Root or Object

To validate an OCFL Storage Root with all objects, run the validate command on the target folder or zip file

gocfl validate ./ocfl.zip
gocfl validate ./storage_root
gocfl validate ./ocfl_create.zip
gocfl validate ./storage_root_create

To validate a single OCFL Object, run the validate command on the target folder or zip file and specify the object-id:

gocfl validate ./ocfl.zip --object-id 'id:abc123'

Extracting an Object from an OCFL Repository

To extract an object from an OCFL Repository, run the extract command:

gocfl extract ./ocfl.zip ./extract --object-id 'id:abc123' --with-manifest
gocfl extract ./storage_root ./extract --object-id 'id:abc123' --with-manifest

This command extracts the object id:abc123 from the storage root archive.zip to the directory /temp/abc123. The --with-manifest flag adds the manifest file manifest.XXX to the extracted object where XXXis the digest algorithm used for the manifest. The target directory must be empty.

With sha512sum, you can check the integrity of the extracted object

cd extract; sha512sum -c manifest.sha512; cd ..

Extracting Metadata from an OCFL Object

To extract metadata from an OCFL Object, run the extractmeta command:

gocfl extractmeta ./ocfl.zip --object-id 'id:abc123' --format json --output ./meta.json
gocfl extractmeta ./storage_root --object-id 'id:abc123' --format json --output ./meta.json

Extracting Information from an OCFL Storage Root or Object

To extract information from an OCFL Object, run the info command:

gocfl info ./ocfl.zip --object-id 'id:abc123' 
gocfl info ./storage_root --object-id 'id:abc123'

This command prints information about the object id:abc123 from the storage root archive.zip or storage_rootto the console. It contains the Object ID, Digest, Head Version, Number of Files