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formulary.rb
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formulary.rb
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# frozen_string_literal: true
require "digest/md5"
require "extend/cachable"
# The Formulary is responsible for creating instances of {Formula}.
# It is not meant to be used directly from formulae.
module Formulary
extend Cachable
def self.enable_factory_cache!
@factory_cache = true
end
def self.factory_cached?
!@factory_cache.nil?
end
def self.formula_class_defined?(path)
cache.key?(path)
end
def self.formula_class_get(path)
cache.fetch(path)
end
def self.load_formula(name, path, contents, namespace)
raise "Formula loading disabled by HOMEBREW_DISABLE_LOAD_FORMULA!" if Homebrew::EnvConfig.disable_load_formula?
mod = Module.new
const_set(namespace, mod)
begin
mod.module_eval(contents, path)
rescue NameError, ArgumentError, ScriptError => e
raise FormulaUnreadableError.new(name, e)
end
class_name = class_s(name)
begin
mod.const_get(class_name)
rescue NameError => e
class_list = mod.constants
.map { |const_name| mod.const_get(const_name) }
.select { |const| const.is_a?(Class) }
new_exception = FormulaClassUnavailableError.new(name, path, class_name, class_list)
raise new_exception, "", e.backtrace
end
end
def self.load_formula_from_path(name, path)
contents = path.open("r") { |f| ensure_utf8_encoding(f).read }
namespace = "FormulaNamespace#{Digest::MD5.hexdigest(path.to_s)}"
klass = load_formula(name, path, contents, namespace)
cache[path] = klass
end
def self.resolve(name, spec: nil)
if name.include?("/") || File.exist?(name)
f = factory(name, *spec)
if f.any_version_installed?
tab = Tab.for_formula(f)
resolved_spec = spec || tab.spec
f.active_spec = resolved_spec if f.send(resolved_spec)
f.build = tab
if f.head? && tab.tabfile
k = Keg.new(tab.tabfile.parent)
f.version.update_commit(k.version.version.commit) if k.version.head?
end
end
else
rack = to_rack(name)
alias_path = factory(name).alias_path
f = from_rack(rack, *spec, alias_path: alias_path)
end
# If this formula was installed with an alias that has since changed,
# then it was specified explicitly in ARGV. (Using the alias would
# instead have found the new formula.)
#
# Because of this, the user is referring to this specific formula,
# not any formula targeted by the same alias, so in this context
# the formula shouldn't be considered outdated if the alias used to
# install it has changed.
f.follow_installed_alias = false
f
end
def self.ensure_utf8_encoding(io)
io.set_encoding(Encoding::UTF_8)
end
def self.class_s(name)
class_name = name.capitalize
class_name.gsub!(/[-_.\s]([a-zA-Z0-9])/) { Regexp.last_match(1).upcase }
class_name.tr!("+", "x")
class_name.sub!(/(.)@(\d)/, "\\1AT\\2")
class_name
end
# A FormulaLoader returns instances of formulae.
# Subclasses implement loaders for particular sources of formulae.
class FormulaLoader
# The formula's name
attr_reader :name
# The formula's ruby file's path or filename
attr_reader :path
# The name used to install the formula
attr_reader :alias_path
def initialize(name, path)
@name = name
@path = path.resolved_path
end
# Gets the formula instance.
#
# `alias_path` can be overridden here in case an alias was used to refer to
# a formula that was loaded in another way.
def get_formula(spec, alias_path: nil)
klass.new(name, path, spec, alias_path: alias_path || self.alias_path)
end
def klass
load_file unless Formulary.formula_class_defined?(path)
Formulary.formula_class_get(path)
end
private
def load_file
$stderr.puts "#{$PROGRAM_NAME} (#{self.class.name}): loading #{path}" if ARGV.debug?
raise FormulaUnavailableError, name unless path.file?
Formulary.load_formula_from_path(name, path)
end
end
# Loads formulae from bottles.
class BottleLoader < FormulaLoader
def initialize(bottle_name)
case bottle_name
when %r{(https?|ftp|file)://}
# The name of the formula is found between the last slash and the last hyphen.
formula_name = File.basename(bottle_name)[/(.+)-/, 1]
resource = Resource.new(formula_name) { url bottle_name }
resource.specs[:bottle] = true
downloader = resource.downloader
cached = downloader.cached_location.exist?
downloader.fetch
ohai "Pouring the cached bottle" if cached
@bottle_filename = downloader.cached_location
else
@bottle_filename = Pathname(bottle_name).realpath
end
name, full_name = Utils::Bottles.resolve_formula_names @bottle_filename
super name, Formulary.path(full_name)
end
def get_formula(spec, **)
contents = Utils::Bottles.formula_contents @bottle_filename, name: name
formula = begin
Formulary.from_contents name, @bottle_filename, contents, spec
rescue FormulaUnreadableError => e
opoo <<~EOS
Unreadable formula in #{@bottle_filename}:
#{e}
EOS
super
end
formula.local_bottle_path = @bottle_filename
formula
end
end
class AliasLoader < FormulaLoader
def initialize(alias_path)
path = alias_path.resolved_path
name = path.basename(".rb").to_s
super name, path
@alias_path = alias_path.to_s
end
end
# Loads formulae from disk using a path.
class FromPathLoader < FormulaLoader
def initialize(path)
path = Pathname.new(path).expand_path
super path.basename(".rb").to_s, path
end
end
# Loads formulae from URLs.
class FromUrlLoader < FormulaLoader
attr_reader :url
def initialize(url)
@url = url
uri = URI(url)
formula = File.basename(uri.path, ".rb")
super formula, HOMEBREW_CACHE_FORMULA/File.basename(uri.path)
end
def load_file
if url =~ %r{githubusercontent.com/[\w-]+/[\w-]+/[a-f0-9]{40}(/Formula)?/([\w+-.@]+).rb}
formula_name = Regexp.last_match(2)
opoo <<~EOS
Unsupported installation from a commit URL!
Consider using `brew extract #{formula_name} ...` instead!"
This will extract your desired #{formula_name} version to a stable tap instead of
installing from a commit URL that cannnot receive updates or fixes!
EOS
end
HOMEBREW_CACHE_FORMULA.mkpath
FileUtils.rm_f(path)
curl_download url, to: path
super
rescue MethodDeprecatedError => e
if url =~ %r{github.com/([\w-]+)/homebrew-([\w-]+)/}
e.issues_url = "https://github.com/#{Regexp.last_match(1)}/homebrew-#{Regexp.last_match(2)}/issues/new"
end
raise
end
end
# Loads tapped formulae.
class TapLoader < FormulaLoader
attr_reader :tap
def initialize(tapped_name, from: nil)
warn = ![:keg, :rack].include?(from)
name, path = formula_name_path(tapped_name, warn: warn)
super name, path
end
def formula_name_path(tapped_name, warn: true)
user, repo, name = tapped_name.split("/", 3).map(&:downcase)
@tap = Tap.fetch user, repo
formula_dir = @tap.formula_dir || @tap.path
path = formula_dir/"#{name}.rb"
unless path.file?
if (possible_alias = @tap.alias_dir/name).file?
path = possible_alias.resolved_path
name = path.basename(".rb").to_s
elsif (new_name = @tap.formula_renames[name]) &&
(new_path = formula_dir/"#{new_name}.rb").file?
old_name = name
path = new_path
name = new_name
new_name = @tap.core_tap? ? name : "#{@tap}/#{name}"
elsif (new_tap_name = @tap.tap_migrations[name])
new_tap_user, new_tap_repo, = new_tap_name.split("/")
new_tap_name = "#{new_tap_user}/#{new_tap_repo}"
new_tap = Tap.fetch new_tap_name
new_tap.install unless new_tap.installed?
new_tapped_name = "#{new_tap_name}/#{name}"
name, path = formula_name_path(new_tapped_name, warn: false)
old_name = tapped_name
new_name = new_tap.core_tap? ? name : new_tapped_name
end
opoo "Use #{new_name} instead of deprecated #{old_name}" if warn && old_name && new_name
end
[name, path]
end
def get_formula(spec, alias_path: nil)
super
rescue FormulaUnreadableError => e
raise TapFormulaUnreadableError.new(tap, name, e.formula_error), "", e.backtrace
rescue FormulaClassUnavailableError => e
raise TapFormulaClassUnavailableError.new(tap, name, e.path, e.class_name, e.class_list), "", e.backtrace
rescue FormulaUnavailableError => e
raise TapFormulaUnavailableError.new(tap, name), "", e.backtrace
end
def load_file
super
rescue MethodDeprecatedError => e
e.issues_url = tap.issues_url || tap.to_s
raise
end
end
class NullLoader < FormulaLoader
def initialize(name)
super name, Formulary.core_path(name)
end
def get_formula(*)
raise FormulaUnavailableError, name
end
end
# Load formulae directly from their contents.
class FormulaContentsLoader < FormulaLoader
# The formula's contents
attr_reader :contents
def initialize(name, path, contents)
@contents = contents
super name, path
end
def klass
$stderr.puts "#{$PROGRAM_NAME} (#{self.class.name}): loading #{path}" if ARGV.debug?
namespace = "FormulaNamespace#{Digest::MD5.hexdigest(contents)}"
Formulary.load_formula(name, path, contents, namespace)
end
end
# Return a Formula instance for the given reference.
# `ref` is a string containing:
#
# * a formula name
# * a formula pathname
# * a formula URL
# * a local bottle reference
def self.factory(ref, spec = :stable, alias_path: nil, from: nil)
raise ArgumentError, "Formulae must have a ref!" unless ref
cache_key = "#{ref}-#{spec}-#{alias_path}-#{from}"
if factory_cached? && cache[:formulary_factory] &&
cache[:formulary_factory][cache_key]
return cache[:formulary_factory][cache_key]
end
formula = loader_for(ref, from: from).get_formula(spec, alias_path: alias_path)
if factory_cached?
cache[:formulary_factory] ||= {}
cache[:formulary_factory][cache_key] ||= formula
end
formula
end
# Return a Formula instance for the given rack.
# It will auto resolve formula's spec when requested spec is nil
#
# The :alias_path option will be used if the formula is found not to be
# installed, and discarded if it is installed because the alias_path used
# to install the formula will be set instead.
def self.from_rack(rack, spec = nil, alias_path: nil)
kegs = rack.directory? ? rack.subdirs.map { |d| Keg.new(d) } : []
keg = kegs.find(&:linked?) || kegs.find(&:optlinked?) || kegs.max_by(&:version)
if keg
from_keg(keg, spec, alias_path: alias_path)
else
factory(rack.basename.to_s, spec || :stable, alias_path: alias_path, from: :rack)
end
end
# Return whether given rack is keg-only
def self.keg_only?(rack)
Formulary.from_rack(rack).keg_only?
rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
false
end
# Return a Formula instance for the given keg.
# It will auto resolve formula's spec when requested spec is nil
def self.from_keg(keg, spec = nil, alias_path: nil)
tab = Tab.for_keg(keg)
tap = tab.tap
spec ||= tab.spec
f = if tap.nil?
factory(keg.rack.basename.to_s, spec, alias_path: alias_path, from: :keg)
else
begin
factory("#{tap}/#{keg.rack.basename}", spec, alias_path: alias_path, from: :keg)
rescue FormulaUnavailableError
# formula may be migrated to different tap. Try to search in core and all taps.
factory(keg.rack.basename.to_s, spec, alias_path: alias_path, from: :keg)
end
end
f.build = tab
f.build.used_options = Tab.remap_deprecated_options(f.deprecated_options, tab.used_options).as_flags
f.version.update_commit(keg.version.version.commit) if f.head? && keg.version.head?
f
end
# Return a Formula instance directly from contents
def self.from_contents(name, path, contents, spec = :stable)
FormulaContentsLoader.new(name, path, contents).get_formula(spec)
end
def self.to_rack(ref)
# If using a fully-scoped reference, check if the formula can be resolved.
factory(ref) if ref.include? "/"
# Check whether the rack with the given name exists.
if (rack = HOMEBREW_CELLAR/File.basename(ref, ".rb")).directory?
return rack.resolved_path
end
# Use canonical name to locate rack.
(HOMEBREW_CELLAR/canonical_name(ref)).resolved_path
end
def self.canonical_name(ref)
loader_for(ref).name
rescue TapFormulaAmbiguityError
# If there are multiple tap formulae with the name of ref,
# then ref is the canonical name
ref.downcase
end
def self.path(ref)
loader_for(ref).path
end
def self.loader_for(ref, from: nil)
case ref
when Pathname::BOTTLE_EXTNAME_RX
return BottleLoader.new(ref)
when %r{(https?|ftp|file)://}
return FromUrlLoader.new(ref)
when HOMEBREW_TAP_FORMULA_REGEX
return TapLoader.new(ref, from: from)
end
return FromPathLoader.new(ref) if File.extname(ref) == ".rb" && Pathname.new(ref).expand_path.exist?
formula_with_that_name = core_path(ref)
return FormulaLoader.new(ref, formula_with_that_name) if formula_with_that_name.file?
possible_alias = CoreTap.instance.alias_dir/ref
return AliasLoader.new(possible_alias) if possible_alias.file?
possible_tap_formulae = tap_paths(ref)
raise TapFormulaAmbiguityError.new(ref, possible_tap_formulae) if possible_tap_formulae.size > 1
if possible_tap_formulae.size == 1
path = possible_tap_formulae.first.resolved_path
name = path.basename(".rb").to_s
return FormulaLoader.new(name, path)
end
if newref = CoreTap.instance.formula_renames[ref]
formula_with_that_oldname = core_path(newref)
return FormulaLoader.new(newref, formula_with_that_oldname) if formula_with_that_oldname.file?
end
possible_tap_newname_formulae = []
Tap.each do |tap|
if newref = tap.formula_renames[ref]
possible_tap_newname_formulae << "#{tap.name}/#{newref}"
end
end
if possible_tap_newname_formulae.size > 1
raise TapFormulaWithOldnameAmbiguityError.new(ref, possible_tap_newname_formulae)
end
return TapLoader.new(possible_tap_newname_formulae.first, from: from) unless possible_tap_newname_formulae.empty?
possible_keg_formula = Pathname.new("#{HOMEBREW_PREFIX}/opt/#{ref}/.brew/#{ref}.rb")
return FormulaLoader.new(ref, possible_keg_formula) if possible_keg_formula.file?
possible_cached_formula = Pathname.new("#{HOMEBREW_CACHE_FORMULA}/#{ref}.rb")
return FormulaLoader.new(ref, possible_cached_formula) if possible_cached_formula.file?
NullLoader.new(ref)
end
def self.core_path(name)
CoreTap.instance.formula_dir/"#{name.to_s.downcase}.rb"
end
def self.tap_paths(name, taps = Dir[HOMEBREW_LIBRARY/"Taps/*/*/"])
name = name.to_s.downcase
taps.map do |tap|
Pathname.glob([
"#{tap}Formula/#{name}.rb",
"#{tap}HomebrewFormula/#{name}.rb",
"#{tap}#{name}.rb",
"#{tap}Aliases/#{name}",
]).find(&:file?)
end.compact
end
def self.find_with_priority(ref, spec = :stable)
possible_pinned_tap_formulae = tap_paths(ref, Dir["#{HOMEBREW_LIBRARY}/PinnedTaps/*/*/"]).map(&:realpath)
raise TapFormulaAmbiguityError.new(ref, possible_pinned_tap_formulae) if possible_pinned_tap_formulae.size > 1
if possible_pinned_tap_formulae.size == 1
selected_formula = factory(possible_pinned_tap_formulae.first, spec)
if core_path(ref).file?
odisabled "the brew tap-pin command",
"fully-scoped user/tap/formula naming when installing and in dependency references"
end
selected_formula
else
factory(ref, spec)
end
end
end