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%% -*- Mode: Erlang; tab-width: 4 -*-
-module(agner_download).
-export([fetch/2]).
%% internal exports
-export([git/1, git/2, process_port/2]).
fetch({git, URL, Ref}, Directory) ->
case filelib:is_dir(Directory) of
false -> %% clone
PortClone = git(["clone", URL, Directory]),
process_port(PortClone, fun () -> git_checkout(Ref, Directory) end);
true -> %% existing repo (or something else)
PortFetch = git(["fetch","origin"]),
process_port(PortFetch, fun() -> git_checkout(Ref, Directory) end)
end;
fetch({hg, URL, Rev}, Directory) ->
case filelib:is_dir(Directory) of
false -> %% new
PortClone = hg(["clone", "-U", URL, Directory]),
process_port(PortClone, fun () ->
PortUpdate = hg(["update", Rev]),
process_port(PortUpdate, fun () -> ok end)
end);
true -> %% existing
PortClone = hg(["pull", "-u", "-r", Rev],[{cd, Directory}]),
process_port(PortClone, fun () -> ok end)
end.
%%
git_checkout({branch, Ref}, Directory) when is_list(Ref)->
PortCheckout = git(["checkout","-q","origin/" ++ Ref],[{cd, Directory}]),
process_port(PortCheckout, fun () -> ok end);
git_checkout({tag, Ref}, Directory) when is_list(Ref) ->
PortCheckout = git(["checkout","-q",Ref],[{cd, Directory}]),
process_port(PortCheckout, fun () -> ok end);
git_checkout(Ref, Directory) when is_list(Ref) ->
PortCheckout = git(["checkout","-q",Ref],[{cd, Directory}]),
process_port(PortCheckout, fun () -> ok end).
git(Args) ->
git(Args,[]).
git(Args, Opts) ->
Git = os:find_executable("git"),
open_port({spawn_executable, Git},[{args, Args},
exit_status|Opts]).
hg(Args) ->
hg(Args,[]).
hg(Args, Opts) ->
Hg = os:find_executable("hg"),
open_port({spawn_executable, Hg},[{args, Args},
exit_status|Opts]).
process_port(Port, Fun) ->
receive
{Port, {exit_status, 0}} ->
apply(Fun, []);
{Port, {exit_status, Status}} ->
{error, Status};
{'EXIT', Port, PosixCode} ->
{error, PosixCode}
end.
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