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t6010-merge-base.sh
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#!/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_NAME='C O Mmiter'
GIT_AUTHOR_NAME='A U Thor'
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) &&
echo $commit >.git/refs/tags/$NAME &&
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 &&
git merge -s ours CC1 &&
test_commit CC-o &&
test_commit CCB &&
git reset --hard CC1 &&
git merge -s ours 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 '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