t/t6010-merge-base.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5
   6 test_description='Merge base and parent list computation.
   7 '
   8
   9 . ./test-lib.sh
  10
  11 M=1130000000
  12 Z=+0000
  13
  14 GIT_COMMITTER_EMAIL=git@comm.iter.xz
  15 GIT_COMMITTER_NAME='C O Mmiter'
  16 GIT_AUTHOR_NAME='A U Thor'
  17 GIT_AUTHOR_EMAIL=git@au.thor.xz
  18 export GIT_COMMITTER_EMAIL GIT_COMMITTER_NAME GIT_AUTHOR_NAME GIT_AUTHOR_EMAIL
  19
  20 doit () {
  21         OFFSET=$1 &&
  22         NAME=$2 &&
  23         shift 2 &&
  24
  25         PARENTS= &&
  26         for P
  27         do
  28                 PARENTS="${PARENTS}-p $P "
  29         done &&
  30
  31         GIT_COMMITTER_DATE="$(($M + $OFFSET)) $Z" &&
  32         GIT_AUTHOR_DATE=$GIT_COMMITTER_DATE &&
  33         export GIT_COMMITTER_DATE GIT_AUTHOR_DATE &&
  34
  35         commit=$(echo $NAME | git commit-tree $T $PARENTS) &&
  36
  37         git update-ref "refs/tags/$NAME" "$commit" &&
  38         echo $commit
  39 }
  40
  41 test_expect_success 'setup' '
  42         T=$(git mktree </dev/null)
  43 '
  44
  45 test_expect_success 'set up G and H' '
  46         # E---D---C---B---A
  47         # \"-_         \   \
  48         #  \  `---------G   \
  49         #   \                \
  50         #    F----------------H
  51         E=$(doit 5 E) &&
  52         D=$(doit 4 D $E) &&
  53         F=$(doit 6 F $E) &&
  54         C=$(doit 3 C $D) &&
  55         B=$(doit 2 B $C) &&
  56         A=$(doit 1 A $B) &&
  57         G=$(doit 7 G $B $E) &&
  58         H=$(doit 8 H $A $F)
  59 '
  60
  61 test_expect_success 'merge-base G H' '
  62         git name-rev $B >expected &&
  63
  64         MB=$(git merge-base G H) &&
  65         git name-rev "$MB" >actual.single &&
  66
  67         MB=$(git merge-base --all G H) &&
  68         git name-rev "$MB" >actual.all &&
  69
  70         MB=$(git show-branch --merge-base G H) &&
  71         git name-rev "$MB" >actual.sb &&
  72
  73         test_cmp expected actual.single &&
  74         test_cmp expected actual.all &&
  75         test_cmp expected actual.sb
  76 '
  77
  78 test_expect_success 'merge-base/show-branch --independent' '
  79         git name-rev "$H" >expected1 &&
  80         git name-rev "$H" "$G" >expected2 &&
  81
  82         parents=$(git merge-base --independent H) &&
  83         git name-rev $parents >actual1.mb &&
  84         parents=$(git merge-base --independent A H G) &&
  85         git name-rev $parents >actual2.mb &&
  86
  87         parents=$(git show-branch --independent H) &&
  88         git name-rev $parents >actual1.sb &&
  89         parents=$(git show-branch --independent A H G) &&
  90         git name-rev $parents >actual2.sb &&
  91
  92         test_cmp expected1 actual1.mb &&
  93         test_cmp expected2 actual2.mb &&
  94         test_cmp expected1 actual1.sb &&
  95         test_cmp expected2 actual2.sb
  96 '
  97
  98 test_expect_success 'unsynchronized clocks' '
  99         # This test is to demonstrate that relying on timestamps in a distributed
 100         # SCM to provide a _consistent_ partial ordering of commits leads to
 101         # insanity.
 102         #
 103         #               Relative
 104         # Structure     timestamps
 105         #
 106         #   PL  PR        +4  +4
 107         #  /  \/  \      /  \/  \
 108         # L2  C2  R2    +3  -1  +3
 109         # |   |   |     |   |   |
 110         # L1  C1  R1    +2  -2  +2
 111         # |   |   |     |   |   |
 112         # L0  C0  R0    +1  -3  +1
 113         #   \ |  /        \ |  /
 114         #     S             0
 115         #
 116         # The left and right chains of commits can be of any length and complexity as
 117         # long as all of the timestamps are greater than that of S.
 118
 119         S=$(doit  0 S) &&
 120
 121         C0=$(doit -3 C0 $S) &&
 122         C1=$(doit -2 C1 $C0) &&
 123         C2=$(doit -1 C2 $C1) &&
 124
 125         L0=$(doit  1 L0 $S) &&
 126         L1=$(doit  2 L1 $L0) &&
 127         L2=$(doit  3 L2 $L1) &&
 128
 129         R0=$(doit  1 R0 $S) &&
 130         R1=$(doit  2 R1 $R0) &&
 131         R2=$(doit  3 R2 $R1) &&
 132
 133         PL=$(doit  4 PL $L2 $C2) &&
 134         PR=$(doit  4 PR $C2 $R2) &&
 135
 136         git name-rev $C2 >expected &&
 137
 138         MB=$(git merge-base PL PR) &&
 139         git name-rev "$MB" >actual.single &&
 140
 141         MB=$(git merge-base --all PL PR) &&
 142         git name-rev "$MB" >actual.all &&
 143
 144         test_cmp expected actual.single &&
 145         test_cmp expected actual.all
 146 '
 147
 148 test_expect_success '--independent with unsynchronized clocks' '
 149         IB=$(doit 0 IB) &&
 150         I1=$(doit -10 I1 $IB) &&
 151         I2=$(doit  -9 I2 $I1) &&
 152         I3=$(doit  -8 I3 $I2) &&
 153         I4=$(doit  -7 I4 $I3) &&
 154         I5=$(doit  -6 I5 $I4) &&
 155         I6=$(doit  -5 I6 $I5) &&
 156         I7=$(doit  -4 I7 $I6) &&
 157         I8=$(doit  -3 I8 $I7) &&
 158         IH=$(doit  -2 IH $I8) &&
 159
 160         echo $IH >expected &&
 161         git merge-base --independent IB IH >actual &&
 162         test_cmp expected actual
 163 '
 164
 165 test_expect_success 'merge-base for octopus-step (setup)' '
 166         # Another set to demonstrate base between one commit and a merge
 167         # in the documentation.
 168         #
 169         # * C (MMC) * B (MMB) * A  (MMA)
 170         # * o       * o       * o
 171         # * o       * o       * o
 172         # * o       * o       * o
 173         # * o       | _______/
 174         # |         |/
 175         # |         * 1 (MM1)
 176         # | _______/
 177         # |/
 178         # * root (MMR)
 179
 180         test_commit MMR &&
 181         test_commit MM1 &&
 182         test_commit MM-o &&
 183         test_commit MM-p &&
 184         test_commit MM-q &&
 185         test_commit MMA &&
 186         git checkout MM1 &&
 187         test_commit MM-r &&
 188         test_commit MM-s &&
 189         test_commit MM-t &&
 190         test_commit MMB &&
 191         git checkout MMR &&
 192         test_commit MM-u &&
 193         test_commit MM-v &&
 194         test_commit MM-w &&
 195         test_commit MM-x &&
 196         test_commit MMC
 197 '
 198
 199 test_expect_success 'merge-base A B C' '
 200         git rev-parse --verify MM1 >expected &&
 201         git rev-parse --verify MMR >expected.sb &&
 202
 203         git merge-base --all MMA MMB MMC >actual &&
 204         git merge-base --all --octopus MMA MMB MMC >actual.common &&
 205         git show-branch --merge-base MMA MMB MMC >actual.sb &&
 206
 207         test_cmp expected actual &&
 208         test_cmp expected.sb actual.common &&
 209         test_cmp expected.sb actual.sb
 210 '
 211
 212 test_expect_success 'criss-cross merge-base for octopus-step' '
 213         git reset --hard MMR &&
 214         test_commit CC1 &&
 215         git reset --hard E &&
 216         test_commit CC2 &&
 217         test_tick &&
 218         # E is a root commit unrelated to MMR root on which CC1 is based
 219         git merge -s ours --allow-unrelated-histories CC1 &&
 220         test_commit CC-o &&
 221         test_commit CCB &&
 222         git reset --hard CC1 &&
 223         # E is a root commit unrelated to MMR root on which CC1 is based
 224         git merge -s ours --allow-unrelated-histories CC2 &&
 225         test_commit CCA &&
 226
 227         git rev-parse CC1 CC2 >expected &&
 228         git merge-base --all CCB CCA^^ CCA^^2 >actual &&
 229
 230         sort expected >expected.sorted &&
 231         sort actual >actual.sorted &&
 232         test_cmp expected.sorted actual.sorted
 233 '
 234
 235 test_expect_success 'using reflog to find the fork point' '
 236         git reset --hard &&
 237         git checkout -b base $E &&
 238
 239         (
 240                 for count in 1 2 3
 241                 do
 242                         git commit --allow-empty -m "Base commit #$count" &&
 243                         git rev-parse HEAD >expect$count &&
 244                         git checkout -B derived &&
 245                         git commit --allow-empty -m "Derived #$count" &&
 246                         git rev-parse HEAD >derived$count &&
 247                         git checkout -B base $E || exit 1
 248                 done
 249
 250                 for count in 1 2 3
 251                 do
 252                         git merge-base --fork-point base $(cat derived$count) >actual &&
 253                         test_cmp expect$count actual || exit 1
 254                 done
 255
 256         ) &&
 257         # check that we correctly default to HEAD
 258         git checkout derived &&
 259         git merge-base --fork-point base >actual &&
 260         test_cmp expect3 actual
 261 '
 262
 263 test_expect_success '--fork-point works with empty reflog' '
 264         git -c core.logallrefupdates=false branch no-reflog base &&
 265         git merge-base --fork-point no-reflog derived &&
 266         test_cmp expect3 actual
 267 '
 268
 269 test_expect_success 'merge-base --octopus --all for complex tree' '
 270         # Best common ancestor for JE, JAA and JDD is JC
 271         #             JE
 272         #            / |
 273         #           /  |
 274         #          /   |
 275         #  JAA    /    |
 276         #   |\   /     |
 277         #   | \  | JDD |
 278         #   |  \ |/ |  |
 279         #   |   JC JD  |
 280         #   |    | /|  |
 281         #   |    |/ |  |
 282         #  JA    |  |  |
 283         #   |\  /|  |  |
 284         #   X JB |  X  X
 285         #   \  \ | /   /
 286         #    \__\|/___/
 287         #        J
 288         test_commit J &&
 289         test_commit JB &&
 290         git reset --hard J &&
 291         test_commit JC &&
 292         git reset --hard J &&
 293         test_commit JTEMP1 &&
 294         test_merge JA JB &&
 295         test_merge JAA JC &&
 296         git reset --hard J &&
 297         test_commit JTEMP2 &&
 298         test_merge JD JB &&
 299         test_merge JDD JC &&
 300         git reset --hard J &&
 301         test_commit JTEMP3 &&
 302         test_merge JE JC &&
 303         git rev-parse JC >expected &&
 304         git merge-base --all --octopus JAA JDD JE >actual &&
 305         test_cmp expected actual
 306 '
 307
 308 test_done