Irmin is a distributed database that follows the same design principles as Git
Clone or download
samoht Merge pull request #572 from samoht/update-fns
irmin: separate set/test_and_set/merge functions to update the store
Latest commit ae3c6ca Oct 16, 2018
Permalink
Failed to load latest commit information.
examples irmin: separate set/test_and_set/merge functions to update the store Oct 12, 2018
src Merge pull request #572 from samoht/update-fns Oct 16, 2018
test irmin: separate set/test_and_set/merge functions to update the store Oct 12, 2018
.gitignore Update gitignore Sep 16, 2018
.travis.yml Add irmin-graphql to appveyor.yml and .travis.yml Oct 10, 2018
CHANGES.md Update CHANGES Jan 3, 2018
LICENSE.md LICENSE.md: add title Aug 30, 2017
Makefile Convert to dune Aug 23, 2018
README.md Mention $HOME/.irmin/config.yml in README Jun 6, 2018
appveyor.yml Add irmin-graphql to appveyor.yml and .travis.yml Oct 10, 2018
dune-project Convert to dune Aug 23, 2018
irmin-chunk.opam Convert to dune Aug 23, 2018
irmin-fs.descr Use jbuilder May 11, 2017
irmin-fs.opam Convert to dune Aug 23, 2018
irmin-git.descr Add opam description files Feb 23, 2017
irmin-git.opam Add tests for generic Git stores Oct 10, 2018
irmin-graphql.opam Remove circular irmin-unix dep from irmin-graphql.opam Oct 10, 2018
irmin-http.descr Add opam description files Feb 23, 2017
irmin-http.opam Convert to dune Aug 23, 2018
irmin-mem.descr Use jbuilder May 11, 2017
irmin-mem.opam Convert to dune Aug 23, 2018
irmin-mirage.descr Add opam description files Feb 23, 2017
irmin-mirage.opam Remove the result shim Sep 25, 2018
irmin-test.descr Create irmin-test May 25, 2018
irmin-test.opam Convert to dune Aug 23, 2018
irmin-unix.descr Add opam description files Feb 23, 2017
irmin-unix.opam Add irmin-graphql to irmin-unix.opam Oct 10, 2018
irmin.descr Add opam description files Feb 23, 2017
irmin.opam Add tests for Irmin.Type combinators Sep 25, 2018
prepare-exe.sh Add a small script to prepare the final .exe on windows Apr 4, 2016

README.md

Irmin - A distributed database built on the same principles as Git

Build Status docs

Irmin is an OCaml library for building mergeable, branchable distributed data stores.

Features

  • Built-in snapshotting - backup and restore
  • Storage agnostic - you can use Irmin on top of your own storage layer
  • Custom datatypes - (de)serialization for custom data types
  • Highly portable - runs anywhere from Linux to web browsers and Xen unikernels
  • Git compatibility - irmin-git uses an on-disk format that can be inspected and modified using Git
  • Dynamic behavior - allows the users to define custom merge functions, use in-memory transactions (to keep track of reads as well as writes) and to define event-driven workflows using a notification mechanism

Documentation

Documentation can be found online at https://mirage.github.io/irmin

Installation

To install Irmin, the command-line tool and all optional dependencies using opam:

opam install irmin-unix

A minimal installation, with no storage backends can be installed by running:

opam install irmin

To only install the in-memory storage backend:

opam install irmin-mem

The following packages have been made available on opam:

  • irmin - the base package, no storage implementations
  • irmin-chunk - chunked storage
  • irmin-fs - filesystem-based storage using bin_prot
  • irmin-git - Git compatible storage
  • irmin-http - a simple REST interface
  • irmin-mem - in-memory storage implementation
  • irmin-mirage - mirage compatibility
  • irmin-unix - unix compatibility

For more information about an individual package consult the online documentation

Examples

Below is a simple example of setting a key and getting the value out of a Git based, filesystem-backed store.

open Lwt.Infix

(* Irmin store with string contents *)
module Store = Irmin_unix.Git.FS.KV(Irmin.Contents.String)

(* Database configuration *)
let config = Irmin_git.config ~bare:true "/tmp/irmin/test"

(* Commit author *)
let author = "Example <example@example.com>"

(* Commit information *)
let info fmt = Irmin_unix.info ~author fmt

let main =
    (* Open the repo *)
    Store.Repo.v config >>=

    (* Load the master branch *)
    Store.master >>= fun t ->

    (* Set key "foo/bar" to "testing 123" *)
    Store.set t ~info:(info "Updating foo/bar") ["foo"; "bar"] "testing 123" >>= fun () ->

    (* Get key "foo/bar" and print it to stdout *)
    Store.get t ["foo"; "bar"] >|= fun x ->
    Printf.printf "foo/bar => '%s'\n" x

(* Run the program *)
let () = Lwt_main.run main

To compile the example above, save it to a file called example.ml and run:

$ ocamlfind ocamlopt example.ml -o example -package irmin-unix,lwt.unix -linkpkg
$ ./example
foo/bar => 'testing 123'

The examples directory contains some more advanced examples. The build them, run:

$ jbuilder build examples/trees.exe
$ _build/default/examples/trees.exe

Command-line

The same thing can also be accomplished using irmin, the command-line application installed with irmin-unix, by running:

$ echo "root: ." > irmin.yml
$ irmin init
$ irmin set foo/bar "testing 123"
$ irmin get foo/bar

irmin.yml allows for irmin flags to be set on a per-directory basis. You can also set flags globally using $HOME/.irmin/config.yml. Run irmin help irmin.yml for further details.

Also see irmin --help for list of all commands and either irmin <command> --help or irmin help <command> for more help with a specific command.

Issues

Feel free to to report any issues using the Github bugtracker.

Conditions

See the LICENSE file.

Acknowledgements

Development of Irmin was supported in part by the EU FP7 User-Centric Networking project, Grant No. 611001.