Merge branch 'mz/reset-misc'

Various 'reset' optimizations and clean-ups, followed by a change
to allow "git reset" to work even on an unborn branch.

* mz/reset-misc:
  reset: update documentation to require only tree-ish with paths
  reset [--mixed]: use diff-based reset whether or not pathspec was given
  reset: allow reset on unborn branch
  reset $sha1 $pathspec: require $sha1 only to be treeish
  reset.c: inline update_index_refresh()
  reset.c: finish entire cmd_reset() whether or not pathspec is given
  reset [--mixed]: only write index file once
  reset.c: move lock, write and commit out of update_index_refresh()
  reset.c: move update_index_refresh() call out of read_from_tree()
  reset.c: replace switch by if-else
  reset: avoid redundant error message
  reset --keep: only write index file once
  reset.c: share call to die_if_unmerged_cache()
  reset.c: extract function for updating {ORIG_,}HEAD
  reset.c: remove unnecessary variable 'i'
  reset.c: extract function for parsing arguments
  reset: don't allow "git reset -- $pathspec" in bare repo
  reset.c: pass pathspec around instead of (prefix, argv) pair
  reset $pathspec: exit with code 0 if successful
  reset $pathspec: no need to discard index

1 files changed, 52 insertions, 0 deletions

diff --git a/t/t7106-reset-unborn-branch.sh b/t/t7106-reset-unborn-branch.sh
new file mode 100755
index 0000000000..8062cf502b
--- /dev/null
+++ b/t/t7106-reset-unborn-branch.sh
@@ -0,0 +1,52 @@
+#!/bin/sh
+
+test_description='git reset should work on unborn branch'
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+	echo a >a &&
+	echo b >b
+'
+
+test_expect_success 'reset' '
+	git add a b &&
+	git reset &&
+	test "$(git ls-files)" = ""
+'
+
+test_expect_success 'reset HEAD' '
+	rm .git/index &&
+	git add a b &&
+	test_must_fail git reset HEAD
+'
+
+test_expect_success 'reset $file' '
+	rm .git/index &&
+	git add a b &&
+	git reset a &&
+	test "$(git ls-files)" = "b"
+'
+
+test_expect_success 'reset -p' '
+	rm .git/index &&
+	git add a &&
+	echo y | git reset -p &&
+	test "$(git ls-files)" = ""
+'
+
+test_expect_success 'reset --soft is a no-op' '
+	rm .git/index &&
+	git add a &&
+	git reset --soft
+	test "$(git ls-files)" = "a"
+'
+
+test_expect_success 'reset --hard' '
+	rm .git/index &&
+	git add a &&
+	git reset --hard &&
+	test "$(git ls-files)" = "" &&
+	test_path_is_missing a
+'
+
+test_done