Members/nobuyasu/Lua: tools.lua comparison

comparison tools.lua @ 0:73146cb10aa5

add some files

author	Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date	Fri, 01 Feb 2013 03:07:15 +0900
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--1:000000000000
+:73146cb10aa5
+--- fs operations implemented with third-party tools for Unix platform abstractions.
+module("luarocks.fs.unix.tools", package.seeall)
+local fs = require("luarocks.fs")
+local dir = require("luarocks.dir")
+local cfg = require("luarocks.cfg")
+local dir_stack = {}
+local vars = cfg.variables
+local function command_at(directory, cmd)
+return "cd " .. fs.Q(directory) .. " && " .. cmd
+end
+--- Obtain current directory.
+-- Uses the module's internal directory stack.
+-- @return string: the absolute pathname of the current directory.
+function current_dir()
+local pipe = io.popen(vars.PWD)
+local current = pipe:read("*l")
+pipe:close()
+for _, directory in ipairs(dir_stack) do
+current = fs.absolute_name(directory, current)
+end
+return current
+end
+--- Run the given command.
+-- The command is executed in the current directory in the directory stack.
+-- @param cmd string: No quoting/escaping is applied to the command.
+-- @return boolean: true if command succeeds (status code 0), false
+-- otherwise.
+function execute_string(cmd)
+local code = os.execute(command_at(fs.current_dir(), cmd))
+if code == 0 or code == true then
+return true
+else
+return false
+end
+end
+--- Change the current directory.
+-- Uses the module's internal directory stack. This does not have exact
+-- semantics of chdir, as it does not handle errors the same way,
+-- but works well for our purposes for now.
+-- @param directory string: The directory to switch to.
+function change_dir(directory)
+assert(type(directory) == "string")
+table.insert(dir_stack, directory)
+end
+--- Change directory to root.
+-- Allows leaving a directory (e.g. for deleting it) in
+-- a crossplatform way.
+function change_dir_to_root()
+table.insert(dir_stack, "/")
+end
+--- Change working directory to the previous in the directory stack.
+function pop_dir()
+local directory = table.remove(dir_stack)
+return directory ~= nil
+end
+--- Create a directory if it does not already exist.
+-- If any of the higher levels in the path name does not exist
+-- too, they are created as well.
+-- @param directory string: pathname of directory to create.
+-- @return boolean: true on success, false on failure.
+function make_dir(directory)
+assert(directory)
+return fs.execute(vars.MKDIR.." -p", directory)
+end
+--- Remove a directory if it is empty.
+-- Does not return errors (for example, if directory is not empty or
+-- if already does not exist)
+-- @param directory string: pathname of directory to remove.
+function remove_dir_if_empty(directory)
+assert(directory)
+fs.execute_string(fs.quiet(vars.RMDIR.." "..fs.Q(directory)))
+end
+--- Remove a directory if it is empty.
+-- Does not return errors (for example, if directory is not empty or
+-- if already does not exist)
+-- @param directory string: pathname of directory to remove.
+function remove_dir_tree_if_empty(directory)
+assert(directory)
+fs.execute_string(fs.quiet(vars.RMDIR.." -p "..fs.Q(directory)))
+end
+--- Copy a file.
+-- @param src string: Pathname of source
+-- @param dest string: Pathname of destination
+-- @param perm string or nil: Permissions for destination file,
+-- @return boolean or (boolean, string): true on success, false on failure,
+-- plus an error message.
+function copy(src, dest, perm)
+assert(src and dest)
+if fs.execute(vars.CP, src, dest) then
+if perm then
+if fs.is_dir(dest) then
+dest = dir.path(dest, dir.base_name(src))
+end
+if fs.chmod(dest, perm) then
+return true
+else
+return false, "Failed setting permissions of "..dest
+end
+end
+return true
+else
+return false, "Failed copying "..src.." to "..dest
+end
+end
+--- Recursively copy the contents of a directory.
+-- @param src string: Pathname of source
+-- @param dest string: Pathname of destination
+-- @return boolean or (boolean, string): true on success, false on failure,
+-- plus an error message.
+function copy_contents(src, dest)
+assert(src and dest)
+if fs.execute_string(fs.quiet(vars.CP.." -pPR "..fs.Q(src).."/* "..fs.Q(dest))) then
+return true
+else
+return false, "Failed copying "..src.." to "..dest
+end
+end
+--- Delete a file or a directory and all its contents.
+-- For safety, this only accepts absolute paths.
+-- @param arg string: Pathname of source
+-- @return boolean: true on success, false on failure.
+function delete(arg)
+assert(arg)
+assert(arg:sub(1,1) == "/")
+return fs.execute_string(fs.quiet(vars.RM.." -rf " .. fs.Q(arg)))
+end
+--- List the contents of a directory.
+-- @param at string or nil: directory to list (will be the current
+-- directory if none is given).
+-- @return table: an array of strings with the filenames representing
+-- the contents of a directory.
+function list_dir(at)
+assert(type(at) == "string" or not at)
+if not at then
+at = fs.current_dir()
+end
+if not fs.is_dir(at) then
+return {}
+end
+local result = {}
+local pipe = io.popen(command_at(at, vars.LS))
+for file in pipe:lines() do
+table.insert(result, file)
+end
+pipe:close()
+return result
+end
+--- Recursively scan the contents of a directory.
+-- @param at string or nil: directory to scan (will be the current
+-- directory if none is given).
+-- @return table: an array of strings with the filenames representing
+-- the contents of a directory.
+function find(at)
+assert(type(at) == "string" or not at)
+if not at then
+at = fs.current_dir()
+end
+if not fs.is_dir(at) then
+return {}
+end
+local result = {}
+local pipe = io.popen(command_at(at, vars.FIND.." * 2>/dev/null"))
+for file in pipe:lines() do
+table.insert(result, file)
+end
+pipe:close()
+return result
+end
+--- Compress files in a .zip archive.
+-- @param zipfile string: pathname of .zip archive to be created.
+-- @param ... Filenames to be stored in the archive are given as
+-- additional arguments.
+-- @return boolean: true on success, false on failure.
+function zip(zipfile, ...)
+return fs.execute(vars.ZIP.." -r", zipfile, ...)
+end
+--- Uncompress files from a .zip archive.
+-- @param zipfile string: pathname of .zip archive to be extracted.
+-- @return boolean: true on success, false on failure.
+function unzip(zipfile)
+assert(zipfile)
+return fs.execute(vars.UNZIP, zipfile)
+end
+--- Test is file/directory exists
+-- @param file string: filename to test
+-- @return boolean: true if file exists, false otherwise.
+function exists(file)
+assert(file)
+return fs.execute(vars.TEST, "-e", file)
+end
+--- Test is pathname is a directory.
+-- @param file string: pathname to test
+-- @return boolean: true if it is a directory, false otherwise.
+function is_dir(file)
+assert(file)
+return fs.execute(vars.TEST, "-d", file)
+end
+--- Test is pathname is a regular file.
+-- @param file string: pathname to test
+-- @return boolean: true if it is a regular file, false otherwise.
+function is_file(file)
+assert(file)
+return fs.execute(vars.TEST, "-f", file)
+end
+--- Download a remote file.
+-- @param url string: URL to be fetched.
+-- @param filename string or nil: this function attempts to detect the
+-- resulting local filename of the remote file as the basename of the URL;
+-- if that is not correct (due to a redirection, for example), the local
+-- filename can be given explicitly as this second argument.
+-- @return boolean: true on success, false on failure.
+function download(url, filename)
+assert(type(url) == "string")
+assert(type(filename) == "string" or not filename)
+if cfg.downloader == "wget" then
+local wget_cmd = vars.WGET.." --no-check-certificate --no-cache --user-agent='"..cfg.user_agent.." via wget' --quiet --continue "
+if filename then
+return fs.execute(wget_cmd.." --output-document ", filename, url)
+else
+return fs.execute(wget_cmd, url)
+end
+elseif cfg.downloader == "curl" then
+filename = filename or dir.base_name(url)
+return fs.execute_string(vars.CURL.." -L --user-agent '"..cfg.user_agent.." via curl' "..fs.Q(url).." 2> /dev/null 1> "..fs.Q(filename))
+end
+end
+function chmod(pathname, mode)
+if mode then
+return fs.execute(vars.CHMOD, mode, pathname)
+else
+return false
+end
+end
+--- Apply a patch.
+-- @param patchname string: The filename of the patch.
+function apply_patch(patchname)
+return fs.execute(vars.PATCH.." -p1 -f -i ", patchname)
+end
+--- Unpack an archive.
+-- Extract the contents of an archive, detecting its format by
+-- filename extension.
+-- @param archive string: Filename of archive.
+-- @return boolean or (boolean, string): true on success, false and an error message on failure.
+function unpack_archive(archive)
+assert(type(archive) == "string")
+local ok
+if archive:match("%.tar%.gz$") or archive:match("%.tgz$") then
+ok = fs.execute_string(vars.GUNZIP.." -c "..archive.."|"..vars.TAR.." -xf -")
+elseif archive:match("%.tar%.bz2$") then
+ok = fs.execute_string(vars.BUNZIP2.." -c "..archive.."|tar -xf -")
+elseif archive:match("%.zip$") then
+ok = fs.execute(vars.UNZIP, archive)
+elseif archive:match("%.lua$") or archive:match("%.c$") then
+-- Ignore .lua and .c files; they don't need to be extracted.
+return true
+else
+local ext = archive:match(".*(%..*)")
+return false, "Unrecognized filename extension "..(ext or "")
+end
+if not ok then
+return false, "Failed extracting "..archive
+end
+return true
+end
+local md5_cmd = {
+md5sum = vars.MD5SUM,
+openssl = vars.OPENSSL.." md5",
+md5 = vars.MD5,
+}
+--- Get the MD5 checksum for a file.
+-- @param file string: The file to be computed.
+-- @return string: The MD5 checksum
+function get_md5(file)
+local cmd = md5_cmd[cfg.md5checker]
+if not cmd then return nil end
+local pipe = io.popen(cmd.." "..fs.absolute_name(file))
+local computed = pipe:read("*a")
+pipe:close()
+if not computed then return nil end
+return computed:match("("..("%x"):rep(32)..")")
+end
+function get_permissions(filename)
+local pipe = io.popen(vars.STAT.." "..vars.STATFLAG.." "..fs.Q(filename))
+local ret = pipe:read("*l")
+pipe:close()
+return ret
+end

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comparison tools.lua @ 0:73146cb10aa5