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4f21454b55
The --fork-point option looks in the reflog to try to find where a derived branch forked from a base branch. However, if the reflog for the base branch is totally empty (as it commonly is right after cloning, which does not write a reflog entry), then our for_each_reflog call will not find any entries, and we will come up with no merge base, even though there may be one with the current tip of the base. We can fix this by just adding the current tip to our list of collected entries. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
307 lines
6.9 KiB
Bash
Executable file
307 lines
6.9 KiB
Bash
Executable file
#!/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='Merge base and parent list computation.
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'
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. ./test-lib.sh
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M=1130000000
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Z=+0000
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GIT_COMMITTER_EMAIL=git@comm.iter.xz
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GIT_COMMITTER_NAME='C O Mmiter'
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GIT_AUTHOR_NAME='A U Thor'
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GIT_AUTHOR_EMAIL=git@au.thor.xz
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export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
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doit () {
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OFFSET=$1 &&
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NAME=$2 &&
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shift 2 &&
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PARENTS= &&
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for P
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do
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PARENTS="${PARENTS}-p $P "
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done &&
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GIT_COMMITTER_DATE="$(($M + $OFFSET)) $Z" &&
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GIT_AUTHOR_DATE=$GIT_COMMITTER_DATE &&
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export GIT_COMMITTER_DATE GIT_AUTHOR_DATE &&
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commit=$(echo $NAME | git commit-tree $T $PARENTS) &&
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echo $commit >.git/refs/tags/$NAME &&
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echo $commit
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}
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test_expect_success 'setup' '
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T=$(git mktree </dev/null)
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'
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test_expect_success 'set up G and H' '
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# E---D---C---B---A
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# \"-_ \ \
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# \ `---------G \
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# \ \
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# F----------------H
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E=$(doit 5 E) &&
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D=$(doit 4 D $E) &&
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F=$(doit 6 F $E) &&
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C=$(doit 3 C $D) &&
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B=$(doit 2 B $C) &&
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A=$(doit 1 A $B) &&
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G=$(doit 7 G $B $E) &&
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H=$(doit 8 H $A $F)
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'
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test_expect_success 'merge-base G H' '
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git name-rev $B >expected &&
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MB=$(git merge-base G H) &&
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git name-rev "$MB" >actual.single &&
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MB=$(git merge-base --all G H) &&
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git name-rev "$MB" >actual.all &&
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MB=$(git show-branch --merge-base G H) &&
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git name-rev "$MB" >actual.sb &&
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test_cmp expected actual.single &&
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test_cmp expected actual.all &&
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test_cmp expected actual.sb
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'
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test_expect_success 'merge-base/show-branch --independent' '
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git name-rev "$H" >expected1 &&
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git name-rev "$H" "$G" >expected2 &&
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parents=$(git merge-base --independent H) &&
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git name-rev $parents >actual1.mb &&
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parents=$(git merge-base --independent A H G) &&
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git name-rev $parents >actual2.mb &&
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parents=$(git show-branch --independent H) &&
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git name-rev $parents >actual1.sb &&
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parents=$(git show-branch --independent A H G) &&
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git name-rev $parents >actual2.sb &&
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test_cmp expected1 actual1.mb &&
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test_cmp expected2 actual2.mb &&
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test_cmp expected1 actual1.sb &&
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test_cmp expected2 actual2.sb
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'
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test_expect_success 'unsynchronized clocks' '
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# This test is to demonstrate that relying on timestamps in a distributed
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# SCM to provide a _consistent_ partial ordering of commits leads to
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# insanity.
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#
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# Relative
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# Structure timestamps
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#
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# PL PR +4 +4
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# / \/ \ / \/ \
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# L2 C2 R2 +3 -1 +3
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# | | | | | |
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# L1 C1 R1 +2 -2 +2
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# | | | | | |
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# L0 C0 R0 +1 -3 +1
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# \ | / \ | /
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# S 0
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#
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# The left and right chains of commits can be of any length and complexity as
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# long as all of the timestamps are greater than that of S.
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S=$(doit 0 S) &&
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C0=$(doit -3 C0 $S) &&
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C1=$(doit -2 C1 $C0) &&
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C2=$(doit -1 C2 $C1) &&
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L0=$(doit 1 L0 $S) &&
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L1=$(doit 2 L1 $L0) &&
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L2=$(doit 3 L2 $L1) &&
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R0=$(doit 1 R0 $S) &&
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R1=$(doit 2 R1 $R0) &&
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R2=$(doit 3 R2 $R1) &&
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PL=$(doit 4 PL $L2 $C2) &&
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PR=$(doit 4 PR $C2 $R2) &&
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git name-rev $C2 >expected &&
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MB=$(git merge-base PL PR) &&
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git name-rev "$MB" >actual.single &&
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MB=$(git merge-base --all PL PR) &&
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git name-rev "$MB" >actual.all &&
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test_cmp expected actual.single &&
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test_cmp expected actual.all
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'
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test_expect_success '--independent with unsynchronized clocks' '
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IB=$(doit 0 IB) &&
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I1=$(doit -10 I1 $IB) &&
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I2=$(doit -9 I2 $I1) &&
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I3=$(doit -8 I3 $I2) &&
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I4=$(doit -7 I4 $I3) &&
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I5=$(doit -6 I5 $I4) &&
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I6=$(doit -5 I6 $I5) &&
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I7=$(doit -4 I7 $I6) &&
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I8=$(doit -3 I8 $I7) &&
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IH=$(doit -2 IH $I8) &&
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echo $IH >expected &&
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git merge-base --independent IB IH >actual &&
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test_cmp expected actual
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'
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test_expect_success 'merge-base for octopus-step (setup)' '
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# Another set to demonstrate base between one commit and a merge
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# in the documentation.
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#
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# * C (MMC) * B (MMB) * A (MMA)
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# * o * o * o
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# * o * o * o
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# * o * o * o
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# * o | _______/
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# | |/
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# | * 1 (MM1)
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# | _______/
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# |/
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# * root (MMR)
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test_commit MMR &&
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test_commit MM1 &&
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test_commit MM-o &&
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test_commit MM-p &&
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test_commit MM-q &&
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test_commit MMA &&
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git checkout MM1 &&
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test_commit MM-r &&
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test_commit MM-s &&
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test_commit MM-t &&
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test_commit MMB &&
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git checkout MMR &&
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test_commit MM-u &&
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test_commit MM-v &&
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test_commit MM-w &&
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test_commit MM-x &&
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test_commit MMC
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'
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test_expect_success 'merge-base A B C' '
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git rev-parse --verify MM1 >expected &&
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git rev-parse --verify MMR >expected.sb &&
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git merge-base --all MMA MMB MMC >actual &&
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git merge-base --all --octopus MMA MMB MMC >actual.common &&
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git show-branch --merge-base MMA MMB MMC >actual.sb &&
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test_cmp expected actual &&
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test_cmp expected.sb actual.common &&
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test_cmp expected.sb actual.sb
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'
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test_expect_success 'criss-cross merge-base for octopus-step' '
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git reset --hard MMR &&
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test_commit CC1 &&
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git reset --hard E &&
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test_commit CC2 &&
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test_tick &&
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git merge -s ours CC1 &&
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test_commit CC-o &&
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test_commit CCB &&
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git reset --hard CC1 &&
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git merge -s ours CC2 &&
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test_commit CCA &&
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git rev-parse CC1 CC2 >expected &&
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git merge-base --all CCB CCA^^ CCA^^2 >actual &&
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sort expected >expected.sorted &&
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sort actual >actual.sorted &&
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test_cmp expected.sorted actual.sorted
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'
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test_expect_success 'using reflog to find the fork point' '
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git reset --hard &&
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git checkout -b base $E &&
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(
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for count in 1 2 3
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do
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git commit --allow-empty -m "Base commit #$count" &&
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git rev-parse HEAD >expect$count &&
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git checkout -B derived &&
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git commit --allow-empty -m "Derived #$count" &&
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git rev-parse HEAD >derived$count &&
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git checkout -B base $E || exit 1
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done
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for count in 1 2 3
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do
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git merge-base --fork-point base $(cat derived$count) >actual &&
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test_cmp expect$count actual || exit 1
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done
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) &&
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# check that we correctly default to HEAD
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git checkout derived &&
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git merge-base --fork-point base >actual &&
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test_cmp expect3 actual
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'
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test_expect_success '--fork-point works with empty reflog' '
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git -c core.logallrefupdates=false branch no-reflog base &&
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git merge-base --fork-point no-reflog derived &&
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test_cmp expect3 actual
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'
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test_expect_success 'merge-base --octopus --all for complex tree' '
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# Best common ancestor for JE, JAA and JDD is JC
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# JE
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# / |
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# / |
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# / |
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# JAA / |
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# |\ / |
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# | \ | JDD |
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# | \ |/ | |
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# | JC JD |
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# | | /| |
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# | |/ | |
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# JA | | |
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# |\ /| | |
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# X JB | X X
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# \ \ | / /
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# \__\|/___/
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# J
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test_commit J &&
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test_commit JB &&
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git reset --hard J &&
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test_commit JC &&
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git reset --hard J &&
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test_commit JTEMP1 &&
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test_merge JA JB &&
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test_merge JAA JC &&
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git reset --hard J &&
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test_commit JTEMP2 &&
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test_merge JD JB &&
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test_merge JDD JC &&
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git reset --hard J &&
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test_commit JTEMP3 &&
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test_merge JE JC &&
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git rev-parse JC >expected &&
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git merge-base --all --octopus JAA JDD JE >actual &&
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test_cmp expected actual
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'
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test_done
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