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32192e6622
This adds #3ALT rule (and #2ALT rule for symmetry) to the read-tree 3-way merge logic that collapses paths that are added only in one branch and not in the other internally. This makes --emu23 to succeed in the last remaining case where the pure 2-way merge succeeded and earlier one failed. Running diff between t1001 and t1005 test scripts shows that the only difference between the two is that --emu23 can leave the states into separate stages so that the user can use usual 3-way merge resolution techniques to carry forward the local changes when pure 2-way merge would have refused to run. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
328 lines
9.9 KiB
Bash
328 lines
9.9 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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test_description='Two way merge with read-tree --emu23 $H $M
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This test tries two-way merge (aka fast forward with carry forward).
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There is the head (called H) and another commit (called M), which is
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simply ahead of H. The index and the work tree contains a state that
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is derived from H, but may also have local changes. This test checks
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all the combinations described in the two-tree merge "carry forward"
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rules, found in <Documentation/git-rev-tree.txt>.
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In the test, these paths are used:
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bozbar - in H, stays in M, modified from bozbar to gnusto
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frotz - not in H added in M
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nitfol - in H, stays in M unmodified
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rezrov - in H, deleted in M
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yomin - not in H nor M
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'
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. ./test-lib.sh
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read_tree_twoway () {
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git-read-tree --emu23 "$1" "$2" &&
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git-ls-files --stage &&
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git-merge-cache git-merge-one-file-script -a &&
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git-ls-files --stage
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}
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_x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]'
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_x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40"
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compare_change () {
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cat current
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sed -n >current \
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-e '/^--- /d; /^+++ /d; /^@@ /d;' \
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-e 's/^\([-+][0-7][0-7][0-7][0-7][0-7][0-7]\) '"$_x40"' /\1 X /p' \
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"$1"
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diff -u expected current
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}
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check_cache_at () {
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clean_if_empty=`git-diff-files "$1"`
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case "$clean_if_empty" in
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'') echo "$1: clean" ;;
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?*) echo "$1: dirty" ;;
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esac
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case "$2,$clean_if_empty" in
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clean,) : ;;
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clean,?*) false ;;
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dirty,) false ;;
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dirty,?*) : ;;
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esac
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}
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check_stages () {
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cat >expected_stages
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git-ls-files --stage | sed -e "s/ $_x40 / X /" >current_stages
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diff -u expected_stages current_stages
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}
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test_expect_success \
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setup \
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'echo frotz >frotz &&
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echo nitfol >nitfol &&
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echo bozbar >bozbar &&
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echo rezrov >rezrov &&
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echo yomin >yomin &&
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git-update-cache --add nitfol bozbar rezrov &&
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treeH=`git-write-tree` &&
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echo treeH $treeH &&
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git-ls-tree $treeH &&
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echo gnusto >bozbar &&
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git-update-cache --add frotz bozbar --force-remove rezrov &&
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git-ls-files --stage >M.out &&
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treeM=`git-write-tree` &&
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echo treeM $treeM &&
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git-ls-tree $treeM &&
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git-diff-tree $treeH $treeM'
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# "read-tree -m H I+H M" but I is empty so this is "read-tree -m H H M".
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#
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# bozbar [O && A && B && O==A && O!=B (#14) ==> B] take M by read-tree
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# frotz [!O && !A && B (#2) ==> B] take M by read-tree
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# nitfol [O && A && B && O==A && O==B (#15) ==> B] take M by read-tree
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# rezrov [O && A && !B && O==A (#10) ==> no merge] removed by script
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#
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# Earlier one did not have #2ALT so taking M was done by the script,
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# which also updated the work tree and making frotz clean. With #2ALT,
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# this is resolved by read-tree itself and the path is left dirty
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# because we are not testing "read-tree -u --emu23".
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test_expect_success \
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'1, 2, 3 - no carry forward' \
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'rm -f .git/index &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >1-3.out &&
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diff -u M.out 1-3.out &&
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check_cache_at bozbar dirty &&
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check_cache_at frotz dirty && # same as pure 2-way again.
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check_cache_at nitfol dirty'
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echo '+100644 X 0 yomin' >expected
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test_expect_success \
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'4 - carry forward local addition.' \
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'rm -f .git/index &&
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git-update-cache --add yomin &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >4.out || exit
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diff -u M.out 4.out >4diff.out
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compare_change 4diff.out expected &&
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check_cache_at yomin clean'
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# "read-tree -m H I+H M" where !H && !M; so (I+H) not being up-to-date
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# should not matter. Thanks to #3ALT, this is now possible.
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test_expect_success \
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'5 - carry forward local addition.' \
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'rm -f .git/index &&
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echo yomin >yomin &&
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git-update-cache --add yomin &&
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echo yomin yomin >yomin &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >5.out || exit
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diff -u M.out 5.out >5diff.out
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compare_change 5diff.out expected &&
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check_cache_at yomin dirty'
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# "read-tree -m H I+H M" where !H && M && (I+H) == M, so this should
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# succeed (even the entry is clean), now thanks to #5ALT.
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test_expect_success \
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'6 - local addition already has the same.' \
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'rm -f .git/index &&
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git-update-cache --add frotz &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >6.out &&
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diff -u M.out 6.out &&
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check_cache_at frotz clean'
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# Exactly the same pattern as above but with dirty cache. This also
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# should succeed, now thanks to #5ALT.
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test_expect_success \
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'7 - local addition already has the same.' \
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'rm -f .git/index &&
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echo frotz >frotz &&
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git-update-cache --add frotz &&
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echo frotz frotz >frotz &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >7.out &&
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diff -u M.out 7.out &&
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check_cache_at frotz dirty'
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test_expect_success \
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'8 - conflicting addition.' \
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'rm -f .git/index &&
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echo frotz frotz >frotz &&
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git-update-cache --add frotz &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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test_expect_success \
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'9 - conflicting addition.' \
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'rm -f .git/index &&
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echo frotz frotz >frotz &&
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git-update-cache --add frotz &&
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echo frotz >frotz &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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test_expect_success \
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'10 - path removed.' \
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'rm -f .git/index &&
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echo rezrov >rezrov &&
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git-update-cache --add rezrov &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >10.out &&
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diff -u M.out 10.out'
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test_expect_success \
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'11 - dirty path removed.' \
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'rm -f .git/index &&
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echo rezrov >rezrov &&
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git-update-cache --add rezrov &&
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echo rezrov rezrov >rezrov &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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test_expect_success \
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'12 - unmatching local changes being removed.' \
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'rm -f .git/index &&
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echo rezrov rezrov >rezrov &&
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git-update-cache --add rezrov &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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test_expect_success \
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'13 - unmatching local changes being removed.' \
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'rm -f .git/index &&
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echo rezrov rezrov >rezrov &&
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git-update-cache --add rezrov &&
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echo rezrov >rezrov &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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cat >expected <<EOF
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-100644 X 0 nitfol
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+100644 X 0 nitfol
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EOF
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test_expect_success \
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'14 - unchanged in two heads.' \
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'rm -f .git/index &&
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echo nitfol nitfol >nitfol &&
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git-update-cache --add nitfol &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >14.out || exit
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diff -u M.out 14.out >14diff.out
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compare_change 14diff.out expected &&
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check_cache_at nitfol clean'
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test_expect_success \
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'15 - unchanged in two heads.' \
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'rm -f .git/index &&
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echo nitfol nitfol >nitfol &&
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git-update-cache --add nitfol &&
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echo nitfol nitfol nitfol >nitfol &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >15.out || exit
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diff -u M.out 15.out >15diff.out
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compare_change 15diff.out expected &&
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check_cache_at nitfol dirty'
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# This is different from straight 2-way merge in that it leaves
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# three stages of bozbar in the index file without failing, so
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# the user can run git-diff-stages to examine the situation.
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# With #2ALT, frotz is resolved internally.
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test_expect_success \
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'16 - conflicting local change.' \
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'rm -f .git/index &&
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echo bozbar bozbar >bozbar &&
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git-update-cache --add bozbar &&
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git-read-tree --emu23 $treeH $treeM &&
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check_stages' <<\EOF
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100644 X 1 bozbar
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100644 X 2 bozbar
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100644 X 3 bozbar
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100644 X 0 frotz
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100644 X 0 nitfol
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100644 X 1 rezrov
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100644 X 2 rezrov
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EOF
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test_expect_success \
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'17 - conflicting local change.' \
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'rm -f .git/index &&
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echo bozbar bozbar >bozbar &&
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git-update-cache --add bozbar &&
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echo bozbar bozbar bozbar >bozbar &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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test_expect_success \
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'18 - local change already having a good result.' \
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'rm -f .git/index &&
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echo gnusto >bozbar &&
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git-update-cache --add bozbar &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >18.out &&
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diff -u M.out 18.out &&
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check_cache_at bozbar clean'
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test_expect_success \
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'19 - local change already having a good result, further modified.' \
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'rm -f .git/index &&
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echo gnusto >bozbar &&
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git-update-cache --add bozbar &&
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echo gnusto gnusto >bozbar &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >19.out &&
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diff -u M.out 19.out &&
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check_cache_at bozbar dirty'
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test_expect_success \
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'20 - no local change, use new tree.' \
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'rm -f .git/index &&
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echo bozbar >bozbar &&
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git-update-cache --add bozbar &&
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read_tree_twoway $treeH $treeM &&
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git-ls-files --stage >20.out &&
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diff -u M.out 20.out &&
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check_cache_at bozbar dirty'
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test_expect_success \
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'21 - no local change, dirty cache.' \
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'rm -f .git/index &&
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echo bozbar >bozbar &&
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git-update-cache --add bozbar &&
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echo gnusto gnusto >bozbar &&
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if read_tree_twoway $treeH $treeM; then false; else :; fi'
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# Also make sure we did not break DF vs DF/DF case.
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test_expect_success \
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'DF vs DF/DF case setup.' \
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'rm -f .git/index &&
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echo DF >DF &&
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git-update-cache --add DF &&
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treeDF=`git-write-tree` &&
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echo treeDF $treeDF &&
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git-ls-tree $treeDF &&
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rm -f DF &&
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mkdir DF &&
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echo DF/DF >DF/DF &&
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git-update-cache --add --remove DF DF/DF &&
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treeDFDF=`git-write-tree` &&
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echo treeDFDF $treeDFDF &&
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git-ls-tree $treeDFDF &&
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git-ls-files --stage >DFDF.out'
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test_expect_success \
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'DF vs DF/DF case test.' \
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'rm -f .git/index &&
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rm -fr DF &&
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echo DF >DF &&
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git-update-cache --add DF &&
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read_tree_twoway $treeDF $treeDFDF &&
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git-ls-files --stage >DFDFcheck.out &&
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diff -u DFDF.out DFDFcheck.out &&
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check_cache_at DF/DF clean && # different from pure 2-way
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:'
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test_done
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