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-- gall.repository
--
-- Git Abstraction Layer for Lua -- Repository interface
--
-- Copyright 2012 Daniel Silverstone <dsilvers@digital-scurf.org>
--
--
local ll = require "gall.ll"
local object = require "gall.object"
local tree = require "gall.tree"
local chomp = ll.chomp
local repomethod = {}
local pattern = {
fullsha = string.rep("[0-9a-f]", 40),
shortsha = string.rep("[0-9a-f]", 7),
ref = "refs/.+"
}
for k, v in pairs(pattern) do
pattern[k] = ("^%s$"):format(v)
end
local function _repotostring(repo)
return "<GitRepository(" .. repo.path .. ")>"
end
function repomethod:_run_with_input_and_env(env, input, want_output, ...)
local t = {...}
t.repo = self.path
if want_output then
t.stdout = want_output
end
if input then
t.stdin = input
end
-- We never want to see the stderr dumped to the client, so we eat it.
t.stderr = true
if env then
t.env = env
end
return ll.rungit(t)
end
function repomethod:_run_with_input(input, want_output, ...)
return self:_run_with_input_and_env(nil, input, want_output, ...)
end
function repomethod:_run(want_output, ...)
return self:_run_with_input(nil, want_output, ...)
end
function repomethod:gather(...)
return self:_run(chomp, ...)
end
function repomethod:rawgather(...)
return self:_run(true, ...)
end
function repomethod:force_empty_tree()
self:_run(true, "hash-object", "-t", "tree", "-w", "/dev/null")
return self:get(tree.empty_sha)
end
function repomethod:hash_object(type, content, inject)
local args = {
"hash-object", "-t", type, "--stdin",
}
if inject then
args[#args+1] = "-w"
end
local ok, sha = self:_run_with_input(content, chomp, unpack(args))
return (ok == 0) and sha or nil
end
function repomethod:get_ref(ref)
local ok, sha = self:_run(chomp, "show-ref", "--verify", "-s", ref)
return (ok == 0) and sha or nil
end
function repomethod:update_ref(ref, new_ref, reason, old_ref)
if new_ref and not old_ref then
old_ref = string.rep("0", 40)
end
if not reason then
reason = "Gall internal operations"
end
local cmd = { "update-ref", "-m", reason }
if not new_ref then
cmd[#cmd+1] = "-d"
end
cmd[#cmd+1] = ref
if new_ref then
cmd[#cmd+1] = new_ref
end
if old_ref then
cmd[#cmd+1] = old_ref
end
local why = self:_run(false, unpack(cmd))
if why ~= 0 then
return nil, "update-ref returned " .. tostring(why)
end
return true
end
function repomethod:update_server_info()
local why = self:_run(false, "update-server-info")
if why ~= 0 then
return nil, "update-server-info returned " .. tostring(why)
end
return true
end
function repomethod:all_refs()
local ok, refs = self:_run(chomp, "show-ref")
if ok ~= 0 then return nil, refs end
local reft = {}
for sha, ref in refs:gmatch("([0-9a-f]+) (refs/[^\n]+)") do
reft[ref] = sha
end
return reft
end
function repomethod:normalise(sha)
-- Purpose is to take a 'shaish' object and normalise it
if sha:match(pattern.fullsha) then
return sha
elseif sha:match(pattern.ref) then
local ref, err = self:get_ref(sha)
return ref, err
else
local ok, out, err = self:_run_with_input(sha, chomp, "cat-file", "--batch-check")
if ok ~= 0 then
error((out or "") .. "\n" .. (err or ""))
end
local fullsha = out:match("^("..string.rep("[0-9a-f]", 40)..")")
if fullsha then
return fullsha
end
end
return nil, "Unable to normalise " .. tostring(sha)
end
function repomethod:get(_sha)
local sha, err = self:normalise(_sha)
if not sha then
return nil, err
end
local ret = self.objmemo[sha]
if not ret then
ret = object.new(self, sha)
self.objmemo[sha] = ret
end
return ret
end
function repomethod:merge_base(sha_1, sha_2, get_all)
local args = { sha_1, sha_2 }
if get_all then
args = { "-a", sha_1, sha_2 }
end
args.repo = self.path
args.stderr = true
local ok, out, err = ll.merge_base(args)
if ok ~= 0 and ok ~= 1 then
return nil, (out or "") .. "\n" .. (err or "")
end
local ret = {}
for sha in out:gmatch("([a-f0-9]+)") do
ret[#ret+1] = sha
end
if #ret == 0 then
return true
end
return unpack(ret)
end
function repomethod:rev_list(oldhead, newhead, firstonly)
local args = { newhead, "^" .. oldhead }
if firstonly then
table.insert(args, 1, "--first-parent")
end
args.repo = self.path
args.stderr = true
local ok, out = ll.rev_list(args)
if ok ~= 0 then
return nil, out
end
local ret = {}
for sha in out:gmatch("([a-f0-9]+)") do
ret[#ret+1] = sha
end
if #ret == 0 then
return true
end
return ret
end
function repomethod:symbolic_ref(name, toref)
if toref then
local ok, ref, err = ll.symbolic_ref { "-q", name, toref,
stderr=true, repo=self.path }
if ok ~= 0 or err:find("Unable to create") then
return nil, "Could not set " .. tostring(name) .. " to " .. tostring(toref)
end
end
local ok, ref, err = ll.symbolic_ref { "-q", name, stderr=true, repo=self.path }
if ok == 0 then
return true, ref
end
if ok == 1 then
return false
end
return nil, (ref or "") .. "\n" .. (err or "")
end
function repomethod:config(confname, value)
-- Trivial interface to key/value in config
if not value then
return self:gather("config", confname)
else
self:gather("config", "--replace-all", confname, value)
end
end
local repomt = {
__index = repomethod,
__tostring = _repotostring
}
local function _new(path)
-- return a new git repository object
-- with the git_dir set for the provided path
-- and, if we had to add /.git then the GIT_WORK_DIR set
-- appropriately too
local retrepo = {objmemo=setmetatable({}, {__mode="v"})}
local repopath = path
local workpath = nil
local ok, symref = ll.symbolic_ref { "-q", "HEAD", stderr=true, repo=repopath }
if ok ~= 0 then
repopath = path .. "/.git"
workpath = path
ok, symref = ll.symbolic_ref { "-q", "HEAD", stderr=true, repo=repopath }
end
if ok ~= 0 then
return nil, "Unable to find Git repository at " .. path
end
retrepo.path = repopath
retrepo.work = workpath
retrepo.HEAD = symref
return setmetatable(retrepo, repomt)
end
local function _create(path, full)
-- Cause a bare repository to be created (or a non-bare if full is true)
local args = { stderr = true, repo = path, "-q" }
if not full then
args[#args+1] = "--bare"
end
ok, msg = ll.init(args)
if ok ~= 0 then
return nil, "Unable to create Git repository at " .. path
end
-- Otherwise, return the shiny new repo
return _new(path)
end
return {
create = _create,
new = _new
}
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