3 files changed, 80 insertions, 0 deletions
diff --git a/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb
new file mode 100644
index 000000000..3fd847bc4
--- /dev/null
+++ b/Library/Homebrew/extend/os/linux/requirements/osxfuse_requirement.rb
@@ -0,0 +1,39 @@
+require "requirement"
+
+class OsxfuseRequirement < Requirement
+  download "https://github.com/libfuse/libfuse"
+
+  satisfy(build_env: false) do
+    next true if libfuse_formula_exists? && Formula["libfuse"].installed?
+    includedirs = %w[
+      /usr/include
+      /usr/local/include
+    ]
+    next true if (includedirs.map do |dir|
+      File.exist? "#{dir}/fuse.h"
+    end).any?
+    false
+  end
+
+  def message
+    msg = "libfuse is required to install this formula.\n"
+    if libfuse_formula_exists?
+      msg + <<-EOS.undent
+        Run "brew install libfuse" to install it.
+      EOS
+    else
+      msg + super
+    end
+  end
+
+  private
+
+  def libfuse_formula_exists?
+    begin
+      Formula["libfuse"]
+    rescue FormulaUnavailableError
+      return false
+    end
+    true
+  end
+end
diff --git a/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb
new file mode 100644
index 000000000..8c898a272
--- /dev/null
+++ b/Library/Homebrew/extend/os/mac/requirements/osxfuse_requirement.rb
@@ -0,0 +1,34 @@
+require "requirement"
+
+class OsxfuseRequirement < Requirement
+  cask "osxfuse"
+  download "https://osxfuse.github.io/"
+
+  satisfy(build_env: false) { self.class.binary_osxfuse_installed? }
+
+  def self.binary_osxfuse_installed?
+    File.exist?("/usr/local/include/osxfuse/fuse.h") &&
+      !File.symlink?("/usr/local/include/osxfuse")
+  end
+
+  env do
+    ENV.append_path "PKG_CONFIG_PATH", HOMEBREW_LIBRARY/"Homebrew/os/mac/pkgconfig/fuse"
+
+    unless HOMEBREW_PREFIX.to_s == "/usr/local"
+      ENV.append_path "HOMEBREW_LIBRARY_PATHS", "/usr/local/lib"
+      ENV.append_path "HOMEBREW_INCLUDE_PATHS", "/usr/local/include/osxfuse"
+    end
+  end
+end
+
+class NonBinaryOsxfuseRequirement < Requirement
+  fatal true
+  satisfy(build_env: false) { HOMEBREW_PREFIX.to_s != "/usr/local" || !OsxfuseRequirement.binary_osxfuse_installed? }
+
+  def message
+    <<-EOS.undent
+      osxfuse is already installed from the binary distribution and
+      conflicts with this formula.
+    EOS
+  end
+end
diff --git a/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb b/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb
new file mode 100644
index 000000000..5f56d48c4
--- /dev/null
+++ b/Library/Homebrew/extend/os/requirements/osxfuse_requirement.rb
@@ -0,0 +1,7 @@
+require "requirements/osxfuse_requirement"
+
+if OS.mac?
+  require "extend/os/mac/requirements/osxfuse_requirement"
+elsif OS.linux?
+  require "extend/os/linux/requirements/osxfuse_requirement"
+end