t/t6010-merge-base.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5
   6 test_description='Merge base computation.
   7 '
   8
   9 . ./test-lib.sh
  10
  11 T=$(git write-tree)
  12
  13 M=1130000000
  14 Z=+0000
  15
  16 GIT_COMMITTER_EMAIL=git@comm.iter.xz
  17 GIT_COMMITTER_NAME='C O Mmiter'
  18 GIT_AUTHOR_NAME='A U Thor'
  19 GIT_AUTHOR_EMAIL=git@au.thor.xz
  20 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
  21
  22 doit() {
  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 $commit
  36 }
  37
  38 #  E---D---C---B---A
  39 #  \'-_         \   \
  40 #   \  `---------G   \
  41 #    \                \
  42 #     F----------------H
  43
  44 # Setup...
  45 E=$(doit 5 E)
  46 D=$(doit 4 D $E)
  47 F=$(doit 6 F $E)
  48 C=$(doit 3 C $D)
  49 B=$(doit 2 B $C)
  50 A=$(doit 1 A $B)
  51 G=$(doit 7 G $B $E)
  52 H=$(doit 8 H $A $F)
  53
  54 test_expect_success 'compute merge-base (single)' \
  55     'MB=$(git merge-base G H) &&
  56      expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/B"'
  57
  58 test_expect_success 'compute merge-base (all)' \
  59     'MB=$(git merge-base --all G H) &&
  60      expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/B"'
  61
  62 test_expect_success 'compute merge-base with show-branch' \
  63     'MB=$(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
  86 S=$(doit  0 S)
  87
  88 C0=$(doit -3 C0 $S)
  89 C1=$(doit -2 C1 $C0)
  90 C2=$(doit -1 C2 $C1)
  91
  92 L0=$(doit  1 L0 $S)
  93 L1=$(doit  2 L1 $L0)
  94 L2=$(doit  3 L2 $L1)
  95
  96 R0=$(doit  1 R0 $S)
  97 R1=$(doit  2 R1 $R0)
  98 R2=$(doit  3 R2 $R1)
  99
 100 PL=$(doit  4 PL $L2 $C2)
 101 PR=$(doit  4 PR $C2 $R2)
 102
 103 test_expect_success 'compute merge-base (single)' \
 104     'MB=$(git merge-base PL PR) &&
 105      expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/C2"'
 106
 107 test_expect_success 'compute merge-base (all)' \
 108     'MB=$(git merge-base --all PL PR) &&
 109      expr "$(git name-rev "$MB")" : "[0-9a-f]* tags/C2"'
 110
 111 # Another set to demonstrate base between one commit and a merge
 112 # in the documentation.
 113
 114 test_expect_success 'merge-base for octopus-step (setup)' '
 115         test_tick && git commit --allow-empty -m root && git tag MMR &&
 116         test_tick && git commit --allow-empty -m 1 && git tag MM1 &&
 117         test_tick && git commit --allow-empty -m o &&
 118         test_tick && git commit --allow-empty -m o &&
 119         test_tick && git commit --allow-empty -m o &&
 120         test_tick && git commit --allow-empty -m A && git tag MMA &&
 121         git checkout MM1 &&
 122         test_tick && git commit --allow-empty -m o &&
 123         test_tick && git commit --allow-empty -m o &&
 124         test_tick && git commit --allow-empty -m o &&
 125         test_tick && git commit --allow-empty -m B && git tag MMB &&
 126         git checkout MMR &&
 127         test_tick && git commit --allow-empty -m o &&
 128         test_tick && git commit --allow-empty -m o &&
 129         test_tick && git commit --allow-empty -m o &&
 130         test_tick && git commit --allow-empty -m o &&
 131         test_tick && git commit --allow-empty -m C && git tag MMC
 132 '
 133
 134 test_expect_success 'merge-base A B C' '
 135         MB=$(git merge-base --all MMA MMB MMC) &&
 136         MM1=$(git rev-parse --verify MM1) &&
 137         test "$MM1" = "$MB"
 138 '
 139
 140 test_expect_success 'criss-cross merge-base for octopus-step (setup)' '
 141         git reset --hard MMR &&
 142         test_tick && git commit --allow-empty -m 1 && git tag CC1 &&
 143         git reset --hard E &&
 144         test_tick && git commit --allow-empty -m 2 && git tag CC2 &&
 145         test_tick && git merge -s ours CC1 &&
 146         test_tick && git commit --allow-empty -m o &&
 147         test_tick && git commit --allow-empty -m B && git tag CCB &&
 148         git reset --hard CC1 &&
 149         test_tick && git merge -s ours CC2 &&
 150         test_tick && git commit --allow-empty -m A && git tag CCA
 151 '
 152
 153 test_expect_success 'merge-base B A^^ A^^2' '
 154         MB0=$(git merge-base --all CCB CCA^^ CCA^^2 | sort) &&
 155         MB1=$(git rev-parse CC1 CC2 | sort) &&
 156         test "$MB0" = "$MB1"
 157 '
 158
 159 test_done