bin/brew: enforce UTF-8 locale

Everyone should be using a UTF-8 locale nowadays. Not using one causes
issues like `brew doctor` failing while checking symbolic links that
point at file names with non-ASCII characters, since OS X always uses
Unicode for the file system.

Rely on `locale charmap` to detect the currently selected encoding and
if that's not UTF-8, override the user's choice (if any) by setting
`LC_ALL` to `en_US.UTF-8`, the assumption being that every system has a
usable `en_US.UTF-8` locale installed.

Fixes Homebrew/homebrew#44744.
Closes Homebrew/homebrew#47247.

Signed-off-by: Martin Afanasjew <martin@afanasjew.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/bin/brew b/bin/brew
index 9cdeb1a10..0503abc09 100755
--- a/bin/brew
+++ b/bin/brew
@@ -1,8 +1,15 @@
 #!/bin/sh
+
 chdir() {
   cd "$@" >/dev/null
 }
 
+# Force UTF-8 to avoid encoding issues for users with broken locale settings.
+if [ "$(locale charmap 2> /dev/null)" != "UTF-8" ]
+then
+  export LC_ALL="en_US.UTF-8"
+fi
+
 BREW_FILE_DIRECTORY="$(chdir "${0%/*}" && pwd -P)"
 HOMEBREW_BREW_FILE="$BREW_FILE_DIRECTORY/${0##*/}"