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diff --git a/t/t1002-read-tree-m-u-2way.sh b/t/t1002-read-tree-m-u-2way.sh
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--- /dev/null
+++ b/t/t1002-read-tree-m-u-2way.sh
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+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Two way merge with read-tree -m -u $H $M
+
+This is identical to t1001, but uses -u to update the work tree as well.
+
+'
+. ./test-lib.sh
+
+_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
+_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
+compare_change () {
+ sed >current \
+ -e '/^--- /d; /^+++ /d; /^@@ /d;' \
+ -e 's/^\(.[0-7][0-7][0-7][0-7][0-7][0-7]\) '"$_x40"' /\1 X /' "$1"
+ diff -u expected current
+}
+
+check_cache_at () {
+ clean_if_empty=`git-diff-files "$1"`
+ case "$clean_if_empty" in
+ '') echo "$1: clean" ;;
+ ?*) echo "$1: dirty" ;;
+ esac
+ case "$2,$clean_if_empty" in
+ clean,) : ;;
+ clean,?*) false ;;
+ dirty,) false ;;
+ dirty,?*) : ;;
+ esac
+}
+
+test_expect_success \
+ setup \
+ 'echo frotz >frotz &&
+ echo nitfol >nitfol &&
+ echo bozbar >bozbar &&
+ echo rezrov >rezrov &&
+ echo yomin >yomin &&
+ git-update-cache --add nitfol bozbar rezrov &&
+ treeH=`git-write-tree` &&
+ echo treeH $treeH &&
+ git-ls-tree $treeH &&
+
+ echo gnusto >bozbar &&
+ git-update-cache --add frotz bozbar --force-remove rezrov &&
+ git-ls-files --stage >M.out &&
+ treeM=`git-write-tree` &&
+ echo treeM $treeM &&
+ git-ls-tree $treeM &&
+ sha1sum bozbar frotz nitfol >M.sha1 &&
+ git-diff-tree $treeH $treeM'
+
+test_expect_success \
+ '1, 2, 3 - no carry forward' \
+ 'rm -f .git/index &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >1-3.out &&
+ cmp M.out 1-3.out &&
+ sha1sum -c M.sha1 &&
+ check_cache_at bozbar clean &&
+ check_cache_at frotz clean &&
+ check_cache_at nitfol clean'
+
+echo '+100644 X 0 yomin' >expected
+
+test_expect_success \
+ '4 - carry forward local addition.' \
+ 'rm -f .git/index &&
+ git-update-cache --add yomin &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >4.out || exit
+ diff --unified=0 M.out 4.out >4diff.out
+ compare_change 4diff.out expected &&
+ check_cache_at yomin clean &&
+ sha1sum -c M.sha1 &&
+ echo yomin >yomin1 &&
+ diff yomin yomin1 &&
+ rm -f yomin1'
+
+test_expect_success \
+ '5 - carry forward local addition.' \
+ 'rm -f .git/index &&
+ echo yomin >yomin &&
+ git-update-cache --add yomin &&
+ echo yomin yomin >yomin &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >5.out || exit
+ diff --unified=0 M.out 5.out >5diff.out
+ compare_change 5diff.out expected &&
+ check_cache_at yomin dirty &&
+ sha1sum -c M.sha1 &&
+ : dirty index should have prevented -u from checking it out.
+ echo yomin yomin >yomin1 &&
+ diff yomin yomin1 &&
+ rm -f yomin1'
+
+test_expect_success \
+ '6 - local addition already has the same.' \
+ 'rm -f .git/index &&
+ git-update-cache --add frotz &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >6.out &&
+ diff --unified=0 M.out 6.out &&
+ check_cache_at frotz clean &&
+ sha1sum -c M.sha1 &&
+ echo frotz >frotz1 &&
+ diff frotz frotz1 &&
+ rm -f frotz1'
+
+test_expect_success \
+ '7 - local addition already has the same.' \
+ 'rm -f .git/index &&
+ echo frotz >frotz &&
+ git-update-cache --add frotz &&
+ echo frotz frotz >frotz &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >7.out &&
+ diff --unified=0 M.out 7.out &&
+ check_cache_at frotz dirty &&
+ if sha1sum -c M.sha1; then false; else :; fi &&
+ : dirty index should have prevented -u from checking it out.
+ echo frotz frotz >frotz1 &&
+ diff frotz frotz1 &&
+ rm -f frotz1'
+
+test_expect_success \
+ '8 - conflicting addition.' \
+ 'rm -f .git/index &&
+ echo frotz frotz >frotz &&
+ git-update-cache --add frotz &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '9 - conflicting addition.' \
+ 'rm -f .git/index &&
+ echo frotz frotz >frotz &&
+ git-update-cache --add frotz &&
+ echo frotz >frotz &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '10 - path removed.' \
+ 'rm -f .git/index &&
+ echo rezrov >rezrov &&
+ git-update-cache --add rezrov &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >10.out &&
+ cmp M.out 10.out &&
+ sha1sum -c M.sha1'
+
+test_expect_success \
+ '11 - dirty path removed.' \
+ 'rm -f .git/index &&
+ echo rezrov >rezrov &&
+ git-update-cache --add rezrov &&
+ echo rezrov rezrov >rezrov &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '12 - unmatching local changes being removed.' \
+ 'rm -f .git/index &&
+ echo rezrov rezrov >rezrov &&
+ git-update-cache --add rezrov &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '13 - unmatching local changes being removed.' \
+ 'rm -f .git/index &&
+ echo rezrov rezrov >rezrov &&
+ git-update-cache --add rezrov &&
+ echo rezrov >rezrov &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+cat >expected <<EOF
+-100644 X 0 nitfol
++100644 X 0 nitfol
+EOF
+
+test_expect_success \
+ '14 - unchanged in two heads.' \
+ 'rm -f .git/index &&
+ echo nitfol nitfol >nitfol &&
+ git-update-cache --add nitfol &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >14.out || exit
+ diff --unified=0 M.out 14.out >14diff.out
+ compare_change 14diff.out expected &&
+ check_cache_at nitfol clean &&
+ grep -v nitfol M.sha1 | sha1sum -c &&
+ if sha1sum -c M.sha1; then false; else :; fi &&
+ echo nitfol nitfol >nitfol1 &&
+ diff nitfol nitfol1 &&
+ rm -f nitfol1'
+
+test_expect_success \
+ '15 - unchanged in two heads.' \
+ 'rm -f .git/index &&
+ echo nitfol nitfol >nitfol &&
+ git-update-cache --add nitfol &&
+ echo nitfol nitfol nitfol >nitfol &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >15.out || exit
+ diff --unified=0 M.out 15.out >15diff.out
+ compare_change 15diff.out expected &&
+ check_cache_at nitfol dirty &&
+ grep -v nitfol M.sha1 | sha1sum -c &&
+ if sha1sum -c M.sha1; then false; else :; fi &&
+ echo nitfol nitfol nitfol >nitfol1 &&
+ diff nitfol nitfol1 &&
+ rm -f nitfol1'
+
+test_expect_success \
+ '16 - conflicting local change.' \
+ 'rm -f .git/index &&
+ echo bozbar bozbar >bozbar &&
+ git-update-cache --add bozbar &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '17 - conflicting local change.' \
+ 'rm -f .git/index &&
+ echo bozbar bozbar >bozbar &&
+ git-update-cache --add bozbar &&
+ echo bozbar bozbar bozbar >bozbar &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+test_expect_success \
+ '18 - local change already having a good result.' \
+ 'rm -f .git/index &&
+ echo gnusto >bozbar &&
+ git-update-cache --add bozbar &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >18.out &&
+ diff --unified=0 M.out 18.out &&
+ check_cache_at bozbar clean &&
+ sha1sum -c M.sha1'
+
+test_expect_success \
+ '19 - local change already having a good result, further modified.' \
+ 'rm -f .git/index &&
+ echo gnusto >bozbar &&
+ git-update-cache --add bozbar &&
+ echo gnusto gnusto >bozbar &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >19.out &&
+ diff --unified=0 M.out 19.out &&
+ check_cache_at bozbar dirty &&
+ grep -v bozbar M.sha1 | sha1sum -c &&
+ if sha1sum -c M.sha1; then false; else :; fi &&
+ echo gnusto gnusto >bozbar1 &&
+ diff bozbar bozbar1 &&
+ rm -f bozbar1'
+
+test_expect_success \
+ '20 - no local change, use new tree.' \
+ 'rm -f .git/index &&
+ echo bozbar >bozbar &&
+ git-update-cache --add bozbar &&
+ git-read-tree -m -u $treeH $treeM &&
+ git-ls-files --stage >20.out &&
+ diff --unified=0 M.out 20.out &&
+ check_cache_at bozbar clean &&
+ sha1sum -c M.sha1'
+
+test_expect_success \
+ '21 - no local change, dirty cache.' \
+ 'rm -f .git/index &&
+ echo bozbar >bozbar &&
+ git-update-cache --add bozbar &&
+ echo gnusto gnusto >bozbar &&
+ if git-read-tree -m -u $treeH $treeM; then false; else :; fi'
+
+# Also make sure we did not break DF vs DF/DF case.
+test_expect_success \
+ 'DF vs DF/DF case setup.' \
+ 'rm -f .git/index &&
+ echo DF >DF &&
+ git-update-cache --add DF &&
+ treeDF=`git-write-tree` &&
+ echo treeDF $treeDF &&
+ git-ls-tree $treeDF &&
+
+ rm -f DF &&
+ mkdir DF &&
+ echo DF/DF >DF/DF &&
+ git-update-cache --add --remove DF DF/DF &&
+ treeDFDF=`git-write-tree` &&
+ echo treeDFDF $treeDFDF &&
+ git-ls-tree $treeDFDF &&
+ git-ls-files --stage >DFDF.out'
+
+test_expect_success \
+ 'DF vs DF/DF case test.' \
+ 'rm -f .git/index &&
+ rm -fr DF &&
+ echo DF >DF &&
+ git-update-cache --add DF &&
+ git-read-tree -m -u $treeDF $treeDFDF &&
+ git-ls-files --stage >DFDFcheck.out &&
+ diff --unified=0 DFDF.out DFDFcheck.out &&
+ check_cache_at DF/DF clean'
+
+test_done