Work with car (Content addressed ARchive) files!
This is a Golang implementation of the CAR specifications, both CARv1 and CARv2.
As a format, there are two major module versions:
go-car/v2is geared towards reading and writing CARv2 files, and also supports consuming CARv1 files and using CAR files as an IPFS blockstore.go-car, in the root directory, only supports reading and writing CARv1 files.
Most users should use v2, especially for new software, since the v2 API transparently supports both CAR formats.
This repository provides a car binary that can be used for creating, extracting, and working with car files.
To install the latest version of car, run:
go install github.com/ipld/go-car/cmd/car@latestMore information about this binary is available in cmd/car
CARv2 features:
- Generate index from an existing CARv1 file
- Wrap CARv1 files into a CARv2 with automatic index generation.
- Random-access to blocks in a CAR file given their CID via Read-Only blockstore API, with transparent support for both CARv1 and CARv2
- Write CARv2 files via Read-Write blockstore API, with support for appending blocks to an existing CARv2 file, and resumption from a partially written CARv2 files.
- Individual access to inner CARv1 data payload and index of a CARv2 file via the
ReaderAPI.
See docs on pkg.go.dev.
Here is a shortlist of other examples from the documentation
- Wrap an existing CARv1 file into an indexed CARv2 file
- Open read-only blockstore from a CAR file
- Open read-write blockstore from a CAR file
- Read the index from an existing CARv2 file
- Extract the index from a CARv2 file and store it as a separate file
PRs are welcome!
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