#!/bin/sh

test_description='checkout switching away from an invalid branch'

. ./test-lib.sh

test_expect_success 'setup' '
        echo hello >world &&
        git add world &&
        git commit -m initial
'

test_expect_success 'checkout should not start branch from a tree' '
        test_must_fail git checkout -b newbranch master^{tree}
'

test_expect_success 'checkout master from invalid HEAD' '
        echo $ZERO_OID >.git/HEAD &&
        git checkout master --
'

test_expect_success 'checkout notices failure to lock HEAD' '
        test_when_finished "rm -f .git/HEAD.lock" &&
        >.git/HEAD.lock &&
        test_must_fail git checkout -b other
'

test_expect_success 'create ref directory/file conflict scenario' '
        git update-ref refs/heads/outer/inner master &&

        # do not rely on symbolic-ref to get a known state,
        # as it may use the same code we are testing
        reset_to_df () {
                echo "ref: refs/heads/outer" >.git/HEAD
        }
'

test_expect_success 'checkout away from d/f HEAD (unpacked, to branch)' '
        reset_to_df &&
        git checkout master
'

test_expect_success 'checkout away from d/f HEAD (unpacked, to detached)' '
        reset_to_df &&
        git checkout --detach master
'

test_expect_success 'pack refs' '
        git pack-refs --all --prune
'

test_expect_success 'checkout away from d/f HEAD (packed, to branch)' '
        reset_to_df &&
        git checkout master
'

test_expect_success 'checkout away from d/f HEAD (packed, to detached)' '
        reset_to_df &&
        git checkout --detach master
'
test_done