post-checkout hook, tests, and docs

diff --git a/git-merge-one-file.sh b/git-merge-one-file.sh
index ebbb5759652c58916e5066f9f4f3f842d0c44492..1e7727d2763e744b94f55c2056eccaab12367c9e 100755 (executable)
--- a/git-merge-one-file.sh
+++ b/git-merge-one-file.sh
@@ -27,8 +27,9 @@ case "${1:-.}${2:-.}${3:-.}" in
                # read-tree checked that index matches HEAD already,
                # so we know we do not have this path tracked.
                # there may be an unrelated working tree file here,
-               # which we should just leave unmolested.
-               exit 0
+               # which we should just leave unmolested.  Make sure
+               # we do not have it in the index, though.
+               exec git update-index --remove -- "$4"
        fi
        if test -f "$4"; then
                rm -f -- "$4" &&
@@ -42,7 +43,8 @@ case "${1:-.}${2:-.}${3:-.}" in
 #
 ".$2.")
        # the other side did not add and we added so there is nothing
-       # to be done.
+       # to be done, except making the path merged.
+       exec git update-index --add --cacheinfo "$6" "$2" "$4"
        ;;
 "..$3")
        echo "Adding $4"
@@ -50,7 +52,7 @@ case "${1:-.}${2:-.}${3:-.}" in
                echo "ERROR: untracked $4 is overwritten by the merge."
                exit 1
        }
-       git update-index --add --cacheinfo "$6$7" "$2$3" "$4" &&
+       git update-index --add --cacheinfo "$7" "$3" "$4" &&
                exec git checkout-index -u -f -- "$4"
        ;;