Always use OSX's mktemp on OSX. (#486)

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Bugfixes
 
+- Fix for when user sets PATH to favor gnu mktemp on MacOS/OSX (#485)
 - Support SECRETS_PINENTRY env var for gnupg --pinentry-mode parameter (#221)
 
 ## Version 0.2.6

src/_utils/_git_secret_tools_osx.sh

@@ -17,7 +17,8 @@ function __temp_file_osx {
   #   able if available.  Fallback locations if _CS_DARWIN_USER_TEMP_DIR is not
   #   available are TMPDIR and /tmp."
 
-  filename=$(mktemp -t _git_secret )    
+  # we use /usr/bin/mktemp in case there's another mktemp available. See #485
+  filename=$(/usr/bin/mktemp -t _git_secret )    
   # On OSX this can make a filename like 
   # '/var/folders/nz/vv4_91234569k3tkvyszvwg90009gn/T/_git_secret.HhvUPlUI'
   echo "$filename";