Andrew's git - gitweb.git/blob - t/t6010-merge-base.sh

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano
   4#
   5
   6test_description='Merge base computation.
   7'
   8
   9. ./test-lib.sh
  10
  11T=$(git write-tree)
  12
  13M=1130000000
  14Z=+0000
  15
  16GIT_COMMITTER_EMAIL=git@comm.iter.xz
  17GIT_COMMITTER_NAME='C O Mmiter'
  18GIT_AUTHOR_NAME='A U Thor'
  19GIT_AUTHOR_EMAIL=git@au.thor.xz
  20export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
  21
  22doit() {
  23        OFFSET=$1; shift
  24        NAME=$1; shift
  25        PARENTS=
  26        for P
  27        do
  28                PARENTS="${PARENTS}-p $P "
  29        done
  30        GIT_COMMITTER_DATE="$(($M + $OFFSET)) $Z"
  31        GIT_AUTHOR_DATE=$GIT_COMMITTER_DATE
  32        export GIT_COMMITTER_DATE GIT_AUTHOR_DATE
  33        commit=$(echo $NAME | git commit-tree $T $PARENTS)
  34        echo $commit >.git/refs/tags/$NAME
  35        echo $commit
  36}
  37
  38#  E---D---C---B---A
  39#  \'-_         \   \
  40#   \  `---------G   \
  41#    \                \
  42#     F----------------H
  43
  44# Setup...
  45E=$(doit 5 E)
  46D=$(doit 4 D $E)
  47F=$(doit 6 F $E)
  48C=$(doit 3 C $D)
  49B=$(doit 2 B $C)
  50A=$(doit 1 A $B)
  51G=$(doit 7 G $B $E)
  52H=$(doit 8 H $A $F)
  53
  54test_expect_success 'compute merge-base (single)' \
  55    'MB=$(git merge-base G H) &&
  56     expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/B"'
  57
  58test_expect_success 'compute merge-base (all)' \
  59    'MB=$(git merge-base --all G H) &&
  60     expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/B"'
  61
  62test_expect_success 'compute merge-base with show-branch' \
  63    'MB=$(git show-branch --merge-base G H) &&
  64     expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/B"'
  65
  66# Setup for second test to demonstrate that relying on timestamps in a
  67# distributed SCM to provide a _consistent_ partial ordering of commits
  68# leads to insanity.
  69#
  70#               Relative
  71# Structure     timestamps
  72#
  73#   PL  PR        +4  +4
  74#  /  \/  \      /  \/  \
  75# L2  C2  R2    +3  -1  +3
  76# |   |   |     |   |   |
  77# L1  C1  R1    +2  -2  +2
  78# |   |   |     |   |   |
  79# L0  C0  R0    +1  -3  +1
  80#   \ |  /        \ |  /
  81#     S             0
  82#
  83# The left and right chains of commits can be of any length and complexity as
  84# long as all of the timestamps are greater than that of S.
  85
  86S=$(doit  0 S)
  87
  88C0=$(doit -3 C0 $S)
  89C1=$(doit -2 C1 $C0)
  90C2=$(doit -1 C2 $C1)
  91
  92L0=$(doit  1 L0 $S)
  93L1=$(doit  2 L1 $L0)
  94L2=$(doit  3 L2 $L1)
  95
  96R0=$(doit  1 R0 $S)
  97R1=$(doit  2 R1 $R0)
  98R2=$(doit  3 R2 $R1)
  99
 100PL=$(doit  4 PL $L2 $C2)
 101PR=$(doit  4 PR $C2 $R2)
 102
 103test_expect_success 'compute merge-base (single)' \
 104    'MB=$(git merge-base PL PR) &&
 105     expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/C2"'
 106
 107test_expect_success 'compute merge-base (all)' \
 108    'MB=$(git merge-base --all PL PR) &&
 109     expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/C2"'
 110
 111# Another set to demonstrate base between one commit and a merge
 112# in the documentation.
 113
 114test_expect_success 'merge-base for octopus-step (setup)' '
 115        test_tick && git commit --allow-empty -m root && git tag MMR &&
 116        test_tick && git commit --allow-empty -m 1 && git tag MM1 &&
 117        test_tick && git commit --allow-empty -m o &&
 118        test_tick && git commit --allow-empty -m o &&
 119        test_tick && git commit --allow-empty -m o &&
 120        test_tick && git commit --allow-empty -m A && git tag MMA &&
 121        git checkout MM1 &&
 122        test_tick && git commit --allow-empty -m o &&
 123        test_tick && git commit --allow-empty -m o &&
 124        test_tick && git commit --allow-empty -m o &&
 125        test_tick && git commit --allow-empty -m B && git tag MMB &&
 126        git checkout MMR &&
 127        test_tick && git commit --allow-empty -m o &&
 128        test_tick && git commit --allow-empty -m o &&
 129        test_tick && git commit --allow-empty -m o &&
 130        test_tick && git commit --allow-empty -m o &&
 131        test_tick && git commit --allow-empty -m C && git tag MMC
 132'
 133
 134test_expect_success 'merge-base A B C' '
 135        MB=$(git merge-base --all MMA MMB MMC) &&
 136        MM1=$(git rev-parse --verify MM1) &&
 137        test "$MM1" = "$MB"
 138'
 139
 140test_expect_success 'criss-cross merge-base for octopus-step (setup)' '
 141        git reset --hard MMR &&
 142        test_tick && git commit --allow-empty -m 1 && git tag CC1 &&
 143        git reset --hard E &&
 144        test_tick && git commit --allow-empty -m 2 && git tag CC2 &&
 145        test_tick && git merge -s ours CC1 &&
 146        test_tick && git commit --allow-empty -m o &&
 147        test_tick && git commit --allow-empty -m B && git tag CCB &&
 148        git reset --hard CC1 &&
 149        test_tick && git merge -s ours CC2 &&
 150        test_tick && git commit --allow-empty -m A && git tag CCA
 151'
 152
 153test_expect_success 'merge-base B A^^ A^^2' '
 154        MB0=$(git merge-base --all CCB CCA^^ CCA^^2 | sort) &&
 155        MB1=$(git rev-parse CC1 CC2 | sort) &&
 156        test "$MB0" = "$MB1"
 157'
 158
 159test_done