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#: * `ln`, `link` [`--overwrite`] [`--dry-run`] [`--force`] <formula>:
#: Symlink all of <formula>'s installed files into the Homebrew prefix. This
#: is done automatically when you install formulae but can be useful for DIY
#: installations.
#:
#: If `--overwrite` is passed, Homebrew will delete files which already exist in
#: the prefix while linking.
#:
#: If `--dry-run` or `-n` is passed, Homebrew will list all files which would
#: be linked or which would be deleted by `brew link --overwrite`, but will not
#: actually link or delete any files.
#:
#: If `--force` (or `-f`) is passed, Homebrew will allow keg-only formulae to be linked.
require "ostruct"
module Homebrew
module_function
def link
raise KegUnspecifiedError if ARGV.named.empty?
mode = OpenStruct.new
mode.overwrite = true if ARGV.include? "--overwrite"
mode.dry_run = true if ARGV.dry_run?
ARGV.kegs.each do |keg|
keg_only = keg_only?(keg.rack)
if HOMEBREW_PREFIX.to_s == "/usr/local" && keg_only &&
keg.name.start_with?("openssl", "libressl")
opoo <<~EOS
Refusing to link: #{keg.name}
Linking keg-only #{keg.name} means you may end up linking against the insecure,
deprecated system OpenSSL while using the headers from Homebrew's #{keg.name}.
Instead, pass the full include/library paths to your compiler e.g.:
-I#{HOMEBREW_PREFIX}/opt/#{keg.name}/include -L#{HOMEBREW_PREFIX}/opt/#{keg.name}/lib
EOS
next
elsif keg.linked?
opoo "Already linked: #{keg}"
puts "To relink: brew unlink #{keg.name} && brew link #{keg.name}"
next
elsif keg_only && !ARGV.force?
opoo "#{keg.name} is keg-only and must be linked with --force"
puts "Note that doing so can interfere with building software."
puts_keg_only_path_message(keg)
next
elsif mode.dry_run && mode.overwrite
puts "Would remove:"
keg.link(mode)
next
elsif mode.dry_run
puts "Would link:"
keg.link(mode)
puts_keg_only_path_message(keg) if keg_only
next
end
keg.lock do
print "Linking #{keg}... "
puts if ARGV.verbose?
begin
n = keg.link(mode)
rescue Keg::LinkError
puts
raise
else
puts "#{n} symlinks created"
end
puts_keg_only_path_message(keg) if keg_only && !ARGV.homebrew_developer?
end
end
end
def puts_keg_only_path_message(keg)
bin = keg/"bin"
sbin = keg/"sbin"
return if !bin.directory? && !sbin.directory?
opt = HOMEBREW_PREFIX/"opt/#{keg.name}"
puts "\nIf you need to have this software first in your PATH instead consider running:"
puts " #{Utils::Shell.prepend_path_in_profile(opt/"bin")}" if bin.directory?
puts " #{Utils::Shell.prepend_path_in_profile(opt/"sbin")}" if sbin.directory?
end
def keg_only?(rack)
Formulary.from_rack(rack).keg_only?
rescue FormulaUnavailableError, TapFormulaAmbiguityError, TapFormulaWithOldnameAmbiguityError
false
end
end
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