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-rwxr-xr-xt/t6010-merge-base.sh308
1 files changed, 308 insertions, 0 deletions
diff --git a/t/t6010-merge-base.sh b/t/t6010-merge-base.sh
new file mode 100755
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@@ -0,0 +1,308 @@
+#!/bin/sh
+#
+# Copyright (c) 2005 Junio C Hamano
+#
+
+test_description='Merge base and parent list computation.
+'
+
+. ./test-lib.sh
+
+M=1130000000
+Z=+0000
+
+GIT_COMMITTER_EMAIL=git@comm.iter.xz
+GIT_COMMITTER_NAME='C O Mmiter'
+GIT_AUTHOR_NAME='A U Thor'
+GIT_AUTHOR_EMAIL=git@au.thor.xz
+export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
+
+doit () {
+ OFFSET=$1 &&
+ NAME=$2 &&
+ shift 2 &&
+
+ PARENTS= &&
+ for P
+ do
+ PARENTS="${PARENTS}-p $P "
+ done &&
+
+ GIT_COMMITTER_DATE="$(($M + $OFFSET)) $Z" &&
+ GIT_AUTHOR_DATE=$GIT_COMMITTER_DATE &&
+ export GIT_COMMITTER_DATE GIT_AUTHOR_DATE &&
+
+ commit=$(echo $NAME | git commit-tree $T $PARENTS) &&
+
+ git update-ref "refs/tags/$NAME" "$commit" &&
+ echo $commit
+}
+
+test_expect_success 'setup' '
+ T=$(git mktree </dev/null)
+'
+
+test_expect_success 'set up G and H' '
+ # E---D---C---B---A
+ # \"-_ \ \
+ # \ `---------G \
+ # \ \
+ # F----------------H
+ E=$(doit 5 E) &&
+ D=$(doit 4 D $E) &&
+ F=$(doit 6 F $E) &&
+ C=$(doit 3 C $D) &&
+ B=$(doit 2 B $C) &&
+ A=$(doit 1 A $B) &&
+ G=$(doit 7 G $B $E) &&
+ H=$(doit 8 H $A $F)
+'
+
+test_expect_success 'merge-base G H' '
+ git name-rev $B >expected &&
+
+ MB=$(git merge-base G H) &&
+ git name-rev "$MB" >actual.single &&
+
+ MB=$(git merge-base --all G H) &&
+ git name-rev "$MB" >actual.all &&
+
+ MB=$(git show-branch --merge-base G H) &&
+ git name-rev "$MB" >actual.sb &&
+
+ test_cmp expected actual.single &&
+ test_cmp expected actual.all &&
+ test_cmp expected actual.sb
+'
+
+test_expect_success 'merge-base/show-branch --independent' '
+ git name-rev "$H" >expected1 &&
+ git name-rev "$H" "$G" >expected2 &&
+
+ parents=$(git merge-base --independent H) &&
+ git name-rev $parents >actual1.mb &&
+ parents=$(git merge-base --independent A H G) &&
+ git name-rev $parents >actual2.mb &&
+
+ parents=$(git show-branch --independent H) &&
+ git name-rev $parents >actual1.sb &&
+ parents=$(git show-branch --independent A H G) &&
+ git name-rev $parents >actual2.sb &&
+
+ test_cmp expected1 actual1.mb &&
+ test_cmp expected2 actual2.mb &&
+ test_cmp expected1 actual1.sb &&
+ test_cmp expected2 actual2.sb
+'
+
+test_expect_success 'unsynchronized clocks' '
+ # This test is to demonstrate that relying on timestamps in a distributed
+ # SCM to provide a _consistent_ partial ordering of commits leads to
+ # insanity.
+ #
+ # Relative
+ # Structure timestamps
+ #
+ # PL PR +4 +4
+ # / \/ \ / \/ \
+ # L2 C2 R2 +3 -1 +3
+ # | | | | | |
+ # L1 C1 R1 +2 -2 +2
+ # | | | | | |
+ # L0 C0 R0 +1 -3 +1
+ # \ | / \ | /
+ # S 0
+ #
+ # The left and right chains of commits can be of any length and complexity as
+ # long as all of the timestamps are greater than that of S.
+
+ S=$(doit 0 S) &&
+
+ C0=$(doit -3 C0 $S) &&
+ C1=$(doit -2 C1 $C0) &&
+ C2=$(doit -1 C2 $C1) &&
+
+ L0=$(doit 1 L0 $S) &&
+ L1=$(doit 2 L1 $L0) &&
+ L2=$(doit 3 L2 $L1) &&
+
+ R0=$(doit 1 R0 $S) &&
+ R1=$(doit 2 R1 $R0) &&
+ R2=$(doit 3 R2 $R1) &&
+
+ PL=$(doit 4 PL $L2 $C2) &&
+ PR=$(doit 4 PR $C2 $R2) &&
+
+ git name-rev $C2 >expected &&
+
+ MB=$(git merge-base PL PR) &&
+ git name-rev "$MB" >actual.single &&
+
+ MB=$(git merge-base --all PL PR) &&
+ git name-rev "$MB" >actual.all &&
+
+ test_cmp expected actual.single &&
+ test_cmp expected actual.all
+'
+
+test_expect_success '--independent with unsynchronized clocks' '
+ IB=$(doit 0 IB) &&
+ I1=$(doit -10 I1 $IB) &&
+ I2=$(doit -9 I2 $I1) &&
+ I3=$(doit -8 I3 $I2) &&
+ I4=$(doit -7 I4 $I3) &&
+ I5=$(doit -6 I5 $I4) &&
+ I6=$(doit -5 I6 $I5) &&
+ I7=$(doit -4 I7 $I6) &&
+ I8=$(doit -3 I8 $I7) &&
+ IH=$(doit -2 IH $I8) &&
+
+ echo $IH >expected &&
+ git merge-base --independent IB IH >actual &&
+ test_cmp expected actual
+'
+
+test_expect_success 'merge-base for octopus-step (setup)' '
+ # Another set to demonstrate base between one commit and a merge
+ # in the documentation.
+ #
+ # * C (MMC) * B (MMB) * A (MMA)
+ # * o * o * o
+ # * o * o * o
+ # * o * o * o
+ # * o | _______/
+ # | |/
+ # | * 1 (MM1)
+ # | _______/
+ # |/
+ # * root (MMR)
+
+ test_commit MMR &&
+ test_commit MM1 &&
+ test_commit MM-o &&
+ test_commit MM-p &&
+ test_commit MM-q &&
+ test_commit MMA &&
+ git checkout MM1 &&
+ test_commit MM-r &&
+ test_commit MM-s &&
+ test_commit MM-t &&
+ test_commit MMB &&
+ git checkout MMR &&
+ test_commit MM-u &&
+ test_commit MM-v &&
+ test_commit MM-w &&
+ test_commit MM-x &&
+ test_commit MMC
+'
+
+test_expect_success 'merge-base A B C' '
+ git rev-parse --verify MM1 >expected &&
+ git rev-parse --verify MMR >expected.sb &&
+
+ git merge-base --all MMA MMB MMC >actual &&
+ git merge-base --all --octopus MMA MMB MMC >actual.common &&
+ git show-branch --merge-base MMA MMB MMC >actual.sb &&
+
+ test_cmp expected actual &&
+ test_cmp expected.sb actual.common &&
+ test_cmp expected.sb actual.sb
+'
+
+test_expect_success 'criss-cross merge-base for octopus-step' '
+ git reset --hard MMR &&
+ test_commit CC1 &&
+ git reset --hard E &&
+ test_commit CC2 &&
+ test_tick &&
+ # E is a root commit unrelated to MMR root on which CC1 is based
+ git merge -s ours --allow-unrelated-histories CC1 &&
+ test_commit CC-o &&
+ test_commit CCB &&
+ git reset --hard CC1 &&
+ # E is a root commit unrelated to MMR root on which CC1 is based
+ git merge -s ours --allow-unrelated-histories CC2 &&
+ test_commit CCA &&
+
+ git rev-parse CC1 CC2 >expected &&
+ git merge-base --all CCB CCA^^ CCA^^2 >actual &&
+
+ sort expected >expected.sorted &&
+ sort actual >actual.sorted &&
+ test_cmp expected.sorted actual.sorted
+'
+
+test_expect_success 'using reflog to find the fork point' '
+ git reset --hard &&
+ git checkout -b base $E &&
+
+ (
+ for count in 1 2 3
+ do
+ git commit --allow-empty -m "Base commit #$count" &&
+ git rev-parse HEAD >expect$count &&
+ git checkout -B derived &&
+ git commit --allow-empty -m "Derived #$count" &&
+ git rev-parse HEAD >derived$count &&
+ git checkout -B base $E || exit 1
+ done &&
+
+ for count in 1 2 3
+ do
+ git merge-base --fork-point base $(cat derived$count) >actual &&
+ test_cmp expect$count actual || exit 1
+ done
+
+ ) &&
+ # check that we correctly default to HEAD
+ git checkout derived &&
+ git merge-base --fork-point base >actual &&
+ test_cmp expect3 actual
+'
+
+test_expect_success '--fork-point works with empty reflog' '
+ git -c core.logallrefupdates=false branch no-reflog base &&
+ git merge-base --fork-point no-reflog derived &&
+ test_cmp expect3 actual
+'
+
+test_expect_success 'merge-base --octopus --all for complex tree' '
+ # Best common ancestor for JE, JAA and JDD is JC
+ # JE
+ # / |
+ # / |
+ # / |
+ # JAA / |
+ # |\ / |
+ # | \ | JDD |
+ # | \ |/ | |
+ # | JC JD |
+ # | | /| |
+ # | |/ | |
+ # JA | | |
+ # |\ /| | |
+ # X JB | X X
+ # \ \ | / /
+ # \__\|/___/
+ # J
+ test_commit J &&
+ test_commit JB &&
+ git reset --hard J &&
+ test_commit JC &&
+ git reset --hard J &&
+ test_commit JTEMP1 &&
+ test_merge JA JB &&
+ test_merge JAA JC &&
+ git reset --hard J &&
+ test_commit JTEMP2 &&
+ test_merge JD JB &&
+ test_merge JDD JC &&
+ git reset --hard J &&
+ test_commit JTEMP3 &&
+ test_merge JE JC &&
+ git rev-parse JC >expected &&
+ git merge-base --all --octopus JAA JDD JE >actual &&
+ test_cmp expected actual
+'
+
+test_done
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 15:55:11 +0000