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-- Git Annex Plugin
--
-- This plugin enables support for git-annex on the server-side which allows
-- for the storage of large binary files efficiently in git.
--
-- Copyright 2016-2017 Daniel Silverstone <dsilvers@digital-scurf.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
-- 3. Neither the name of the author nor the names of their contributors
-- may be used to endorse or promote products derived from this software
-- without specific prior written permission.
--
-- THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
local gitano = require "gitano"
local sp = require "luxio.subprocess"
local git_annex_short_help = "Simple git-annex command"
local git_annex_helptext = [[
Git Annex (http://git-annex.branchable.com/) is a mechanism for supporting
large files in git repositories. This plugin relies on git-annex-shell
being available on the server, and forwards that capability on so that
if you can write to a gitano repository you can do git-annex type things
with it. In theory if you can read from the repository then you can
still sync content from it; you just can't write to it.
This plugin is considered experimental, may not work entirely as expected,
and may change without notice.
]]
local function git_annex_detect_repo(config, parsed_cmdline)
local repo, msg
if #parsed_cmdline > 2 then
-- Acquire the repository object for the target repo from arg 3
repo, msg = gitano.repository.find(config, parsed_cmdline[3])
if not repo then
gitano.log.critical("Unable to locate repository.")
gitano.log.critical(" * " .. (tostring(msg)))
return nil, nil
end
if repo.is_nascent then
gitano.log.info("Repository " .. repo.name .. " is nascent")
end
else
gitano.log.critical("No repository provided.")
return nil, nil
end
parsed_cmdline.__annex__repo_at = 3
return repo, parsed_cmdline
end
local function git_annex_validate(config, repo, cmdline)
-- All git-annex commands put the repo in cmdline[3] and all take
-- a directory so cmdline had best be at least 3 big...
if #cmdline < 3 then
gitano.log.error("usage: git-annex-shell <cmd> <reponame> ...")
return false
end
if repo.is_nascent then
gitano.log.error("Cannot run git-annex-shell against a nascent repo")
return false
end
return true
end
local function git_annex_prep(config, repo, cmdline, context)
local ctxcopy = {}
for k, v in pairs(context) do
ctxcopy[k] = v
end
ctxcopy.operation = "write"
local action, reason = repo:run_lace(ctxcopy)
cmdline.__annex__writeable = action == "allow"
context.operation = "read"
return repo:run_lace(context)
end
local function git_annex_run(config, repo, cmdline, env)
-- We need to check if we're allowed to run in write mode...
env.GIT_ANNEX_SHELL_LIMITED = "1"
env.GIT_ANNEX_SHELL_DIRECTORY = repo:fs_path()
if not cmdline.__annex__writeable then
env.GIT_ANNEX_SHELL_READONLY = "1"
end
local cmdcopy = {"git-annex-shell", env=env}
for i = 2, #cmdline do cmdcopy[i] = cmdline[i] end
cmdcopy[cmdline.__annex__repo_at] = repo:fs_path()
local proc = sp.spawn(cmdcopy)
return proc:wait()
end
assert(gitano.command.register("git-annex-shell",
git_annex_short_help, git_annex_helptext,
git_annex_validate, git_annex_prep, git_annex_run,
true, true, false, git_annex_detect_repo, true))
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