Add SourceForge bottle mirror selection.

Use ENV['HOMEBREW_SOURCEFORGE_MIRROR'].

Closes #15642.
Closes #17368.

2 files changed, 8 insertions, 0 deletions

diff --git a/Library/Contributions/manpages/brew.1.md b/Library/Contributions/manpages/brew.1.md
index b151b6f0a..168af06d8 100644
--- a/Library/Contributions/manpages/brew.1.md
+++ b/Library/Contributions/manpages/brew.1.md
@@ -446,6 +446,12 @@ can take several different forms:
 
     *Note:* Homebrew will only try to print emoji on Lion or newer.
 
+  * HOMEBREW\_SOURCEFORGE\_MIRROR:
+    If set, Homebrew will use the value of `HOMEBREW_SOURCEFORGE_MIRROR` to
+    select a SourceForge mirror for downloading bottles.
+
+    *Example:* `export HOMEBREW_SOURCEFORGE_MIRROR='heanet'`
+
   * HOMEBREW\_SVN:
     When exporting from Subversion, Homebrew will use `HOMEBREW_SVN` if set,
     a Homebrew-built Subversion if installed, or the system-provided binary.
diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 7f76d6f52..62e210ded 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -200,6 +200,8 @@ class CurlBottleDownloadStrategy < CurlDownloadStrategy
   def initialize name, package
     super
     @tarball_path = HOMEBREW_CACHE/"#{name}-#{package.version}#{ext}"
+    mirror = ENV['HOMEBREW_SOURCEFORGE_MIRROR']
+    @url = "#{@url}?use_mirror=#{mirror}" if mirror
   end
 end