From c2fde487834c6d7505d7e803256e8764237d4476 Mon Sep 17 00:00:00 2001
From: Hisham Muhammad <hisham@gobolinux.org>
Date: Mon, 3 Sep 2018 19:53:18 +0200
Subject: repos: fix upgrade and downgrade of files when module names clash

This reworks the logic of upgrading/downgrading multiple versions
of the same package (or different packages) when they have
different files that resolve to the same module name (foo.lua
and foo.so).

For a concrete example, this was hitting LuaSec downgrades.
---
 src/luarocks/cmd/show.lua |  55 +++++--
 src/luarocks/repos.lua    | 394 ++++++++++++++++++++++++++--------------------
 2 files changed, 262 insertions(+), 187 deletions(-)

(limited to 'src')

diff --git a/src/luarocks/cmd/show.lua b/src/luarocks/cmd/show.lua
index c90a6bea..bb0fdfd7 100644
--- a/src/luarocks/cmd/show.lua
+++ b/src/luarocks/cmd/show.lua
@@ -5,6 +5,7 @@ local show = {}
 local queries = require("luarocks.queries")
 local search = require("luarocks.search")
 local dir = require("luarocks.core.dir")
+local fs = require("luarocks.fs")
 local cfg = require("luarocks.core.cfg")
 local util = require("luarocks.util")
 local path = require("luarocks.path")
@@ -145,25 +146,52 @@ local function render(template, data)
    return table.concat(out, "\n")
 end
 
-local function files_to_list(name, version, item_set, item_type, repo)
-   local ret = {}
-   for item_name in util.sortedpairs(item_set) do
-      table.insert(ret, { name = item_name, file = repos.which(name, version, item_type, item_name, repo) })
-   end
-   return ret
+local function adjust_path(name, version, basedir, pathname, suffix)
+   pathname = dir.path(basedir, pathname)
+   local vpathname = path.versioned_name(pathname, basedir, name, version)
+   return (fs.exists(vpathname)
+          and vpathname
+          or pathname) .. (suffix or "")
 end
 
 local function modules_to_list(name, version, repo)
    local ret = {}
    local rock_manifest = manif.load_rock_manifest(name, version, repo)
 
-   local lua_dir = path.lua_dir(name, version, repo)
-   local lib_dir = path.lib_dir(name, version, repo)
-   repos.recurse_rock_manifest_entry(rock_manifest.lua, function(pathname, modname)
-      table.insert(ret, { name = modname, file = dir.path(lua_dir, pathname) })
+   local lua_dir = path.deploy_lua_dir(repo)
+   local lib_dir = path.deploy_lib_dir(repo)
+   repos.recurse_rock_manifest_entry(rock_manifest.lua, function(pathname)
+      table.insert(ret, {
+         name = path.path_to_module(pathname),
+         file = adjust_path(name, version, lua_dir, pathname),
+      })
    end)
-   repos.recurse_rock_manifest_entry(rock_manifest.lib, function(pathname, modname)
-      table.insert(ret, { name = modname, file = dir.path(lib_dir, pathname) })
+   repos.recurse_rock_manifest_entry(rock_manifest.lib, function(pathname)
+      table.insert(ret, {
+         name = path.path_to_module(pathname),
+         file = adjust_path(name, version, lib_dir, pathname),
+      })
+   end)
+   table.sort(ret, function(a, b)
+      if a.name == b.name then
+         return a.file < b.file
+      end
+      return a.name < b.name
+   end)
+   return ret
+end
+
+local function commands_to_list(name, version, repo)
+   local ret = {}
+   local rock_manifest = manif.load_rock_manifest(name, version, repo)
+
+   local bin_dir = path.deploy_bin_dir(repo)
+   repos.recurse_rock_manifest_entry(rock_manifest.bin, function(pathname)
+      pathname = adjust_path(name, version, bin_dir, pathname)
+      table.insert(ret, {
+         name = pathname,
+         file = adjust_path(name, version, bin_dir, pathname, cfg.wrapper_suffix),
+      })
    end)
    table.sort(ret, function(a, b)
       if a.name == b.name then
@@ -209,7 +237,7 @@ local function show_rock(template, namespace, name, version, rockspec, repo, min
       issues = desc.issues_url,
       labels = desc.labels and table.concat(desc.labels, ", "),
       location = path.rocks_tree_to_string(repo),
-      commands = files_to_list(name, version, minfo.commands, "command", repo),
+      commands = commands_to_list(name, version, repo),
       modules = modules_to_list(name, version, repo),
       bdeps = deps_to_list(rockspec.build_dependencies, tree),
       tdeps = deps_to_list(rockspec.test_dependencies, tree),
@@ -278,5 +306,4 @@ function show.command(flags, name, version)
    return true
 end
 
-
 return show
diff --git a/src/luarocks/repos.lua b/src/luarocks/repos.lua
index 37a81c20..eaec87b8 100644
--- a/src/luarocks/repos.lua
+++ b/src/luarocks/repos.lua
@@ -9,6 +9,21 @@ local util = require("luarocks.util")
 local dir = require("luarocks.dir")
 local manif = require("luarocks.manif")
 local vers = require("luarocks.core.vers")
+local E = {}
+
+local unpack = unpack or table.unpack
+
+--- Get type and name of an item (a module or a command) provided by a file.
+-- @param deploy_type string: rock manifest subtree the file comes from ("bin", "lua", or "lib").
+-- @param file_path string: path to the file relatively to deploy_type subdirectory.
+-- @return (string, string): item type ("module" or "command") and name.
+local function get_provided_item(deploy_type, file_path)
+   assert(type(deploy_type) == "string")
+   assert(type(file_path) == "string")
+   local item_type = deploy_type == "bin" and "command" or "module"
+   local item_name = item_type == "command" and file_path or path.path_to_module(file_path)
+   return item_type, item_name
+end
 
 -- Tree of files installed by a package are stored
 -- in its rock manifest. Some of these files have to
@@ -52,37 +67,35 @@ function repos.is_installed(name, version)
 end
 
 function repos.recurse_rock_manifest_entry(entry, action)
-   assert(entry == nil or type(entry) == "table")
    assert(type(action) == "function")
 
    if entry == nil then
       return true
    end
 
-   local function do_recurse_rock_manifest_tree(tree, parent_path, parent_mod)
+   local function do_recurse_rock_manifest_entry(tree, parent_path)
+
       for file, sub in pairs(tree) do
          local sub_path = (parent_path and (parent_path .. "/") or "") .. file
-         local sub_mod = (parent_mod and (parent_mod .. ".") or "") .. file
          local ok, err
 
          if type(sub) == "table" then
-            ok, err = do_recurse_rock_manifest_tree(sub, sub_path, sub_mod)
+            ok, err = do_recurse_rock_manifest_entry(sub, sub_path)
          else
-            local mod_no_ext = sub_mod:gsub("%.[^.]*$", "")
-            ok, err = action(sub_path, mod_no_ext)
+            ok, err = action(sub_path)
          end
 
          if err then return nil, err end
       end
       return true
    end
-   return do_recurse_rock_manifest_tree(entry)
+   return do_recurse_rock_manifest_entry(entry)
 end
 
 local function store_package_data(result, rock_manifest, deploy_type)
    if rock_manifest[deploy_type] then
       repos.recurse_rock_manifest_entry(rock_manifest[deploy_type], function(file_path)
-         local _, item_name = manif.get_provided_item(deploy_type, file_path)
+         local _, item_name = get_provided_item(deploy_type, file_path)
          result[item_name] = file_path
          return true
       end)
@@ -206,29 +219,12 @@ local function find_suffixed(file, suffix)
    return nil, table.concat(filenames, ", ") .. " not found"
 end
 
-local function move_suffixed(from_file, to_file, suffix)
-   local suffixed_from_file, err = find_suffixed(from_file, suffix)
-   if not suffixed_from_file then
-      return nil, "Could not move " .. from_file .. " to " .. to_file .. ": " .. err
+local function check_suffix(filename, suffix)
+   local suffixed_filename, err = find_suffixed(filename, suffix)
+   if not suffixed_filename then
+      return ""
    end
-
-   suffix = suffixed_from_file:sub(#from_file + 1)
-   local suffixed_to_file = to_file .. suffix
-   return fs.move(suffixed_from_file, suffixed_to_file)
-end
-
-local function delete_suffixed(file, suffix)
-   local suffixed_file, err = find_suffixed(file, suffix)
-   if not suffixed_file then
-      return nil, "Could not remove " .. file .. ": " .. err, "not found"
-   end
-
-   fs.delete(suffixed_file)
-   if fs.exists(suffixed_file) then
-      return nil, "Failed deleting " .. suffixed_file .. ": file still exists", "fail"
-   end
-
-   return true
+   return suffixed_filename:sub(#filename + 1)
 end
 
 -- Files can be deployed using versioned and non-versioned names.
@@ -238,38 +234,92 @@ end
 -- is deployed using non-versioned name and others use versioned names.
 
 local function get_deploy_paths(name, version, deploy_type, file_path, repo)
+   assert(type(name) == "string")
+   assert(type(version) == "string")
+   assert(type(deploy_type) == "string")
+   assert(type(file_path) == "string")
+
    repo = repo or cfg.root_dir
    local deploy_dir = path["deploy_" .. deploy_type .. "_dir"](repo)
    local non_versioned = dir.path(deploy_dir, file_path)
    local versioned = path.versioned_name(non_versioned, deploy_dir, name, version)
-   return non_versioned, versioned
+   return { nv = non_versioned, v = versioned }
 end
 
-local function prepare_target(name, version, deploy_type, file_path, suffix)
-   local non_versioned, versioned = get_deploy_paths(name, version, deploy_type, file_path)
-   local item_type, item_name = manif.get_provided_item(deploy_type, file_path)
+local function check_spot_if_available(name, version, deploy_type, file_path)
+   local item_type, item_name = get_provided_item(deploy_type, file_path)
    local cur_name, cur_version = manif.get_current_provider(item_type, item_name)
+   if (not cur_name)
+      or (name < cur_name)
+      or (name == cur_name and (version == cur_version
+                                or vers.compare_versions(version, cur_version))) then
+      return "nv", cur_name, cur_version, item_name
+   else
+      -- Existing version has priority, deploy new version using versioned name.
+      return "v", cur_name, cur_version, item_name
+   end
+end
+
+local function backup_existing(should_backup, target)
+   if not should_backup then
+      return
+   end
+   if fs.exists(target) then
+      local backup = target
+      repeat
+         backup = backup.."~"
+      until not fs.exists(backup) -- Slight race condition here, but shouldn't be a problem.
+   
+      util.warning(target.." is not tracked by this installation of LuaRocks. Moving it to "..backup)
+      local move_ok, move_err = fs.move(target, backup)
+      if not move_ok then
+         return nil, move_err
+      end
+   end
+end
+
+local function op_install(op)
+   local ok, err = fs.make_dir(dir.dir_name(op.dst))
+   if not ok then
+      return nil, err
+   end
 
-   if not cur_name then
-      return non_versioned
-   elseif name < cur_name or (name == cur_name and vers.compare_versions(version, cur_version)) then
-      -- New version has priority. Move currently provided version back using versioned name.
-      local cur_deploy_type, cur_file_path = manif.get_providing_file(cur_name, cur_version, item_type, item_name)
-      local cur_non_versioned, cur_versioned = get_deploy_paths(cur_name, cur_version, cur_deploy_type, cur_file_path)
+   ok, err = op.fn(op.src, op.dst, op.backup)
+   if not ok then
+      return nil, err
+   end
 
-      local dir_ok, dir_err = fs.make_dir(dir.dir_name(cur_versioned))
-      if not dir_ok then return nil, dir_err end
+   fs.remove_dir_tree_if_empty(dir.dir_name(op.src))
+end
 
-      local move_ok, move_err = move_suffixed(cur_non_versioned, cur_versioned, suffix)
-      if not move_ok then return nil, move_err end
+local function op_rename(op)
+   if op.suffix then
+      local suffix = check_suffix(op.src, op.suffix)
+      op.src = op.src .. suffix
+      op.dst = op.dst .. suffix
+   end
 
-      return non_versioned
+   if fs.exists(op.src) then
+      fs.make_dir(dir.dir_name(op.dst))
+      local ok, err = fs.move(op.src, op.dst)
+      fs.remove_dir_tree_if_empty(dir.dir_name(op.src))
+      return ok, err
    else
-      -- Current version has priority, deploy new version using versioned name.
-      return versioned
+      return true
    end
 end
 
+local function op_delete(op)
+   if op.suffix then
+      local suffix = check_suffix(op.name, op.suffix)
+      op.name = op.name .. suffix
+   end
+
+   local ok, err = fs.delete(op.name)
+   fs.remove_dir_tree_if_empty(dir.dir_name(op.name))
+   return ok, err
+end
+
 --- Deploy a package from the rocks subdirectory.
 -- @param name string: name of package
 -- @param version string: exact package version in string format
@@ -284,63 +334,89 @@ function repos.deploy_files(name, version, wrap_bin_scripts, deps_mode)
 
    local rock_manifest, load_err = manif.load_rock_manifest(name, version)
    if not rock_manifest then return nil, load_err end
+   
+   local repo = cfg.root_dir
+   local renames = {}
+   local installs = {}
 
-   local function deploy_file_tree(deploy_type, source_dir, move_fn, suffix)
-      return repos.recurse_rock_manifest_entry(rock_manifest[deploy_type], function(file_path)
-         local source = dir.path(source_dir, file_path)
+   local function install_binary(source, target, should_backup)
+      if wrap_bin_scripts and fs.is_lua(source) then
+         backup_existing(should_backup, target .. (cfg.wrapper_suffix or ""))
+         return fs.wrap_script(source, target, deps_mode, name, version)
+      else
+         backup_existing(should_backup, target)
+         return fs.copy_binary(source, target)
+      end
+   end
 
-         local target, prepare_err = prepare_target(name, version, deploy_type, file_path, suffix)
-         if not target then return nil, prepare_err end
+   local function move_lua(source, target, should_backup)
+      backup_existing(should_backup, target)
+      return fs.move(source, target, "read")
+   end
 
-         local dir_ok, dir_err = fs.make_dir(dir.dir_name(target))
-         if not dir_ok then return nil, dir_err end
+   local function move_lib(source, target, should_backup)
+      backup_existing(should_backup, target)
+      return fs.move(source, target, "exec")
+   end
 
-         local suffixed_target, mover = move_fn(source, target)
-         if fs.exists(suffixed_target) then
-            local backup = suffixed_target
-            repeat
-               backup = backup.."~"
-            until not fs.exists(backup) -- Slight race condition here, but shouldn't be a problem.
+   if rock_manifest.bin then
+      local source_dir = path.bin_dir(name, version)
+      repos.recurse_rock_manifest_entry(rock_manifest.bin, function(file_path)
+         local source = dir.path(source_dir, file_path)
+         local paths = get_deploy_paths(name, version, "bin", file_path, repo)
+         local mode, cur_name, cur_version = check_spot_if_available(name, version, "bin", file_path)
 
-            util.warning(suffixed_target.." is not tracked by this installation of LuaRocks. Moving it to "..backup)
-            local move_ok, move_err = fs.move(suffixed_target, backup)
-            if not move_ok then return nil, move_err end
+         if mode == "nv" and cur_name then
+            local cur_paths = get_deploy_paths(cur_name, cur_version, "bin", file_path, repo)
+            table.insert(renames, { src = cur_paths.nv, dst = cur_paths.v, suffix = cfg.wrapper_suffix })
          end
-
-         local move_ok, move_err = mover()
-         if not move_ok then return nil, move_err end
-
-         fs.remove_dir_tree_if_empty(dir.dir_name(source))
-         return true
+         local backup = name ~= cur_name or version ~= cur_version
+         table.insert(installs, { fn = install_binary, src = source, dst = mode == "nv" and paths.nv or paths.v, backup = backup })
       end)
    end
 
-   local function install_binary(source, target)
-      if wrap_bin_scripts and fs.is_lua(source) then
-         return target .. (cfg.wrapper_suffix or ""), function()
-            return fs.wrap_script(source, target, deps_mode, name, version)
-         end
-      else
-         return target, function()
-            return fs.copy_binary(source, target)
+   if rock_manifest.lua then
+      local source_dir = path.lua_dir(name, version)
+      repos.recurse_rock_manifest_entry(rock_manifest.lua, function(file_path)
+         local source = dir.path(source_dir, file_path)
+         local paths = get_deploy_paths(name, version, "lua", file_path, repo)
+         local mode, cur_name, cur_version = check_spot_if_available(name, version, "lua", file_path)
+
+         if mode == "nv" and cur_name then
+            local cur_paths = get_deploy_paths(cur_name, cur_version, "lua", file_path, repo)
+            table.insert(renames, { src = cur_paths.nv, dst = cur_paths.v })
+            cur_paths = get_deploy_paths(cur_name, cur_version, "lib", file_path:gsub("%.lua$", "." .. cfg.lib_extension), repo)
+            table.insert(renames, { src = cur_paths.nv, dst = cur_paths.v })
          end
-      end
+         local backup = name ~= cur_name or version ~= cur_version
+         table.insert(installs, { fn = move_lua, src = source, dst = mode == "nv" and paths.nv or paths.v, backup = backup })
+      end)
    end
 
-   local function make_mover(perms)
-      return function(source, target)
-         return target, function() return fs.move(source, target, perms) end
-      end
+   if rock_manifest.lib then
+      local source_dir = path.lib_dir(name, version)
+      repos.recurse_rock_manifest_entry(rock_manifest.lib, function(file_path)
+         local source = dir.path(source_dir, file_path)
+         local paths = get_deploy_paths(name, version, "lib", file_path, repo)
+         local mode, cur_name, cur_version = check_spot_if_available(name, version, "lib", file_path)
+
+         if mode == "nv" and cur_name then
+            local cur_paths = get_deploy_paths(cur_name, cur_version, "lua", file_path:gsub("%.[^.]+$", ".lua"), repo)
+            table.insert(renames, { src = cur_paths.nv, dst = cur_paths.v })
+            cur_paths = get_deploy_paths(cur_name, cur_version, "lib", file_path, repo)
+            table.insert(renames, { src = cur_paths.nv, dst = cur_paths.v })
+         end
+         local backup = name ~= cur_name or version ~= cur_version
+         table.insert(installs, { fn = move_lib, src = source, dst = mode == "nv" and paths.nv or paths.v, backup = backup })
+      end)
    end
 
-   local ok, err = deploy_file_tree("bin", path.bin_dir(name, version), install_binary, cfg.wrapper_suffix)
-   if not ok then return nil, err end
-
-   ok, err = deploy_file_tree("lua", path.lua_dir(name, version), make_mover("read"))
-   if not ok then return nil, err end
-
-   ok, err = deploy_file_tree("lib", path.lib_dir(name, version), make_mover("exec"))
-   if not ok then return nil, err end
+   for _, op in ipairs(renames) do
+      op_rename(op)
+   end
+   for _, op in ipairs(installs) do
+      op_install(op)
+   end
 
    local writer = require("luarocks.manif.writer")
    return writer.add_to_manifest(name, version, nil, deps_mode)
@@ -364,60 +440,76 @@ function repos.delete_version(name, version, deps_mode, quick)
    local rock_manifest, load_err = manif.load_rock_manifest(name, version)
    if not rock_manifest then return nil, load_err end
 
-   local function delete_deployed_file_tree(deploy_type, suffix)
-      return repos.recurse_rock_manifest_entry(rock_manifest[deploy_type], function(file_path)
-         local non_versioned, versioned = get_deploy_paths(name, version, deploy_type, file_path)
-
-         -- Figure out if the file is deployed using versioned or non-versioned name.
-         local target
-         local item_type, item_name = manif.get_provided_item(deploy_type, file_path)
-         local cur_name, cur_version = manif.get_current_provider(item_type, item_name)
+   local repo = cfg.root_dir
+   local renames = {}
+   local deletes = {}
 
-         if cur_name == name and cur_version == version then
-            -- This package has highest priority, should be in non-versioned location.
-            target = non_versioned
+   if rock_manifest.bin then
+      repos.recurse_rock_manifest_entry(rock_manifest.bin, function(file_path)
+         local paths = get_deploy_paths(name, version, "bin", file_path, repo)
+         local mode, cur_name, cur_version, item_name = check_spot_if_available(name, version, "bin", file_path)
+         if mode == "v" then
+            table.insert(deletes, { name = paths.v, suffix = cfg.wrapper_suffix })
          else
-            target = versioned
-         end
+            table.insert(deletes, { name = paths.nv, suffix = cfg.wrapper_suffix })
 
-         local ok, err, err_type = delete_suffixed(target, suffix)
-         if not ok then
-            if err_type == "not found" then
-               util.warning(err)
-            else
-               return nil, err
+            local next_name, next_version = manif.get_next_provider("command", item_name)
+            if next_name then
+               local next_paths = get_deploy_paths(next_name, next_version, "lua", file_path, repo)
+               table.insert(renames, { src = next_paths.v, dst = next_paths.nv, suffix = cfg.wrapper_suffix })
             end
          end
+      end)
+   end
 
-         if not quick and target == non_versioned then
-            -- If another package provides this file, move its version
-            -- into non-versioned location instead.
-            local next_name, next_version = manif.get_next_provider(item_type, item_name)
+   if rock_manifest.lua then
+      repos.recurse_rock_manifest_entry(rock_manifest.lua, function(file_path)
+         local paths = get_deploy_paths(name, version, "lua", file_path, repo)
+         local mode, cur_name, cur_version, item_name = check_spot_if_available(name, version, "lua", file_path)
+         if mode == "v" then
+            table.insert(deletes, { name = paths.v })
+         else
+            table.insert(deletes, { name = paths.nv })
 
+            local next_name, next_version = manif.get_next_provider("module", item_name)
             if next_name then
-               local next_deploy_type, next_file_path = manif.get_providing_file(next_name, next_version, item_type, item_name)
-               local next_non_versioned, next_versioned = get_deploy_paths(next_name, next_version, next_deploy_type, next_file_path)
-
-               local move_ok, move_err = move_suffixed(next_versioned, next_non_versioned, suffix)
-               if not move_ok then return nil, move_err end
-
-               fs.remove_dir_tree_if_empty(dir.dir_name(next_versioned))
+               local next_lua_paths = get_deploy_paths(next_name, next_version, "lua", file_path, repo)
+               table.insert(renames, { src = next_lua_paths.v, dst = next_lua_paths.nv })
+               local next_lib_paths = get_deploy_paths(next_name, next_version, "lib", file_path:gsub("%.[^.]+$", ".lua"), repo)
+               table.insert(renames, { src = next_lib_paths.v, dst = next_lib_paths.nv })
             end
          end
-
-         fs.remove_dir_tree_if_empty(dir.dir_name(target))
-         return true
       end)
    end
 
-   local ok, err = delete_deployed_file_tree("bin", cfg.wrapper_suffix)
-   if not ok then return nil, err end
+   if rock_manifest.lib then
+      repos.recurse_rock_manifest_entry(rock_manifest.lib, function(file_path)
+         local paths = get_deploy_paths(name, version, "lib", file_path, repo)
+         local mode, cur_name, cur_version, item_name = check_spot_if_available(name, version, "lib", file_path)
+         if mode == "v" then
+            table.insert(deletes, { name = paths.v })
+         else
+            table.insert(deletes, { name = paths.nv })
 
-   ok, err = delete_deployed_file_tree("lua")
-   if not ok then return nil, err end
+            local next_name, next_version = manif.get_next_provider("module", item_name)
+            if next_name then
+               local next_lua_paths = get_deploy_paths(next_name, next_version, "lua", file_path:gsub("%.[^.]+$", ".lua"), repo)
+               table.insert(renames, { src = next_lua_paths.v, dst = next_lua_paths.nv })
+               local next_lib_paths = get_deploy_paths(next_name, next_version, "lib", file_path, repo)
+               table.insert(renames, { src = next_lib_paths.v, dst = next_lib_paths.nv })
+            end
+         end
+      end)
+   end
 
-   ok, err = delete_deployed_file_tree("lib")
-   if not ok then return nil, err end
+   for _, op in ipairs(deletes) do
+      op_delete(op)
+   end
+   if not quick then
+      for _, op in ipairs(renames) do
+         op_rename(op)
+      end
+   end
 
    fs.delete(path.install_dir(name, version))
    if not get_installed_versions(name) then
@@ -432,48 +524,4 @@ function repos.delete_version(name, version, deps_mode, quick)
    return writer.remove_from_manifest(name, version, nil, deps_mode)
 end
 
---- Find full path to a file providing a module or a command
--- in a package.
--- @param name string: name of package.
--- @param version string: exact package version in string format.
--- @param item_type string: "module" or "command".
--- @param item_name string: module or command name.
--- @param root string or nil: A local root dir for a rocks tree. If not given, the default is used.
--- @return string: absolute path to the file providing given module
--- or command.
-function repos.which(name, version, item_type, item_name, repo)
-   local deploy_type, file_path = manif.get_providing_file(name, version, item_type, item_name, repo)
-   local non_versioned, versioned = get_deploy_paths(name, version, deploy_type, file_path, repo)
-   local cur_name, cur_version = manif.get_current_provider(item_type, item_name)
-   local deploy_path = (name == cur_name and version == cur_version) and non_versioned or versioned
-
-   if deploy_type == "bin" and cfg.wrapper_suffix and cfg.wrapper_suffix ~= "" then
-      deploy_path = find_suffixed(deploy_path, cfg.wrapper_suffix) or deploy_path
-   end
-
-   return deploy_path
-end
-
---- Find full path to a file providing a module or a command
--- in a package.
--- @param name string: name of package.
--- @param version string: exact package version in string format.
--- @param item_type string: "module" or "command".
--- @param item_name string: module or command name.
--- @param root string or nil: A local root dir for a rocks tree. If not given, the default is used.
--- @return string: absolute path to the file providing given module
--- or command.
-function repos.which(name, version, item_type, item_name, repo)
-   local deploy_type, file_path = manif.get_providing_file(name, version, item_type, item_name, repo)
-   local non_versioned, versioned = get_deploy_paths(name, version, deploy_type, file_path, repo)
-   local cur_name, cur_version = manif.get_current_provider(item_type, item_name)
-   local deploy_path = (name == cur_name and version == cur_version) and non_versioned or versioned
-
-   if deploy_type == "bin" and cfg.wrapper_suffix and cfg.wrapper_suffix ~= "" then
-      deploy_path = find_suffixed(deploy_path, cfg.wrapper_suffix) or deploy_path
-   end
-
-   return deploy_path
-end
-
 return repos
-- 
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