#!/bin/sh
#
# Copyright (c) 2009 Red Hat, Inc.
#

test_description='Test updating submodules

This test verifies that "git submodule update" detaches the HEAD of the
submodule and "git submodule update --rebase/--merge" does not detach the HEAD.
'

. ./test-lib.sh


compare_head()
{
    sha_master=`git rev-list --max-count=1 master`
    sha_head=`git rev-list --max-count=1 HEAD`

    test "$sha_master" = "$sha_head"
}


test_expect_success 'setup a submodule tree' '
        echo file > file &&
        git add file &&
        test_tick &&
        git commit -m upstream &&
        git clone . super &&
        git clone super submodule &&
        git clone super rebasing &&
        git clone super merging &&
        (cd super &&
         git submodule add ../submodule submodule &&
         test_tick &&
         git commit -m "submodule" &&
         git submodule init submodule
        ) &&
        (cd submodule &&
        echo "line2" > file &&
        git add file &&
        git commit -m "Commit 2"
        ) &&
        (cd super &&
         (cd submodule &&
          git pull --rebase origin
         ) &&
         git add submodule &&
         git commit -m "submodule update"
        ) &&
        (cd super &&
         git submodule add ../rebasing rebasing &&
         test_tick &&
         git commit -m "rebasing"
        ) &&
        (cd super &&
         git submodule add ../merging merging &&
         test_tick &&
         git commit -m "rebasing"
        )
'

test_expect_success 'submodule update detaching the HEAD ' '
        (cd super/submodule &&
         git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update submodule &&
         cd submodule &&
         ! compare_head
        )
'

test_expect_success 'submodule update --rebase staying on master' '
        (cd super/submodule &&
          git checkout master
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update --rebase submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update --merge staying on master' '
        (cd super/submodule &&
          git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update --merge submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update - rebase in .git/config' '
        (cd super &&
         git config submodule.submodule.update rebase
        ) &&
        (cd super/submodule &&
          git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update - checkout in .git/config but --rebase given' '
        (cd super &&
         git config submodule.submodule.update checkout
        ) &&
        (cd super/submodule &&
          git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update --rebase submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update - merge in .git/config' '
        (cd super &&
         git config submodule.submodule.update merge
        ) &&
        (cd super/submodule &&
          git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update - checkout in .git/config but --merge given' '
        (cd super &&
         git config submodule.submodule.update checkout
        ) &&
        (cd super/submodule &&
          git reset --hard HEAD~1
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update --merge submodule &&
         cd submodule &&
         compare_head
        )
'

test_expect_success 'submodule update - checkout in .git/config' '
        (cd super &&
         git config submodule.submodule.update checkout
        ) &&
        (cd super/submodule &&
          git reset --hard HEAD^
        ) &&
        (cd super &&
         (cd submodule &&
          compare_head
         ) &&
         git submodule update submodule &&
         cd submodule &&
         ! compare_head
        )
'

test_expect_success 'submodule init picks up rebase' '
        (cd super &&
         git config -f .gitmodules submodule.rebasing.update rebase &&
         git submodule init rebasing &&
         test "rebase" = "$(git config submodule.rebasing.update)"
        )
'

test_expect_success 'submodule init picks up merge' '
        (cd super &&
         git config -f .gitmodules submodule.merging.update merge &&
         git submodule init merging &&
         test "merge" = "$(git config submodule.merging.update)"
        )
'

test_done