t/t6010-merge-base.sh - jrn/git - Git at Google

 #!/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
	#!/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