Merge branch 'rv/maint-index-commit' into maint

* rv/maint-index-commit:
Make GIT_INDEX_FILE apply to git-commit

diff --combined git-commit.sh
index 5e3908f2cbf5cf96b4f5c3b07d5178b3e2321b58,fdaa019e8f0bdcb222043352068ca2ba6f064cf9..1c0c6b9e418014cd326d8373f54c38286d2e1239
--- 1/git-commit.sh
--- 2/git-commit.sh
+++ b/git-commit.sh
@@@ -26,7 -26,7 +26,7 @@@ refuse_partial () 
  }
  
  TMP_INDEX=
- THIS_INDEX="$GIT_DIR/index"
+ THIS_INDEX="${GIT_INDEX_FILE:-$GIT_DIR/index}"
  NEXT_INDEX="$GIT_DIR/next-index$$"
  rm -f "$NEXT_INDEX"
  save_index () {
@@@ -322,9 -322,9 +322,9 @@@ unset onl
  case "$all,$interactive,$also,$#" in
  *t,*t,*)
        die "Cannot use -a, --interactive or -i at the same time." ;;
 -t,,[1-9]*)
 +t,,,[1-9]*)
        die "Paths with -a does not make sense." ;;
 -,t,[1-9]*)
 +,t,,[1-9]*)
        die "Paths with --interactive does not make sense." ;;
  ,,t,0)
        die "No paths with -i does not make sense." ;;