t/t6421-merge-partial-clone.sh

   1 #!/bin/sh
   2
   3 test_description="limiting blob downloads when merging with partial clones"
   4 # Uses a methodology similar to
   5 #   t6042: corner cases with renames but not criss-cross merges
   6 #   t6036: corner cases with both renames and criss-cross merges
   7 #   t6423: directory rename detection
   8 #
   9 # The setup for all of them, pictorially, is:
  10 #
  11 #      A
  12 #      o
  13 #     / \
  14 #  O o   ?
  15 #     \ /
  16 #      o
  17 #      B
  18 #
  19 # To help make it easier to follow the flow of tests, they have been
  20 # divided into sections and each test will start with a quick explanation
  21 # of what commits O, A, and B contain.
  22 #
  23 # Notation:
  24 #    z/{b,c}   means  files z/b and z/c both exist
  25 #    x/d_1     means  file x/d exists with content d1.  (Purpose of the
  26 #                     underscore notation is to differentiate different
  27 #                     files that might be renamed into each other's paths.)
  28
  29 . ./test-lib.sh
  30 . "$TEST_DIRECTORY"/lib-merge.sh
  31
  32 test_setup_repo () {
  33         test -d server && return
  34         test_create_repo server &&
  35         (
  36                 cd server &&
  37
  38                 git config uploadpack.allowfilter 1 &&
  39                 git config uploadpack.allowanysha1inwant 1 &&
  40
  41                 mkdir -p general &&
  42                 test_seq 2 9 >general/leap1 &&
  43                 cp general/leap1 general/leap2 &&
  44                 echo leap2 >>general/leap2 &&
  45
  46                 mkdir -p basename &&
  47                 cp general/leap1 basename/numbers &&
  48                 cp general/leap1 basename/sequence &&
  49                 cp general/leap1 basename/values &&
  50                 echo numbers >>basename/numbers &&
  51                 echo sequence >>basename/sequence &&
  52                 echo values >>basename/values &&
  53
  54                 mkdir -p dir/unchanged &&
  55                 mkdir -p dir/subdir/tweaked &&
  56                 echo a >dir/subdir/a &&
  57                 echo b >dir/subdir/b &&
  58                 echo c >dir/subdir/c &&
  59                 echo d >dir/subdir/d &&
  60                 echo e >dir/subdir/e &&
  61                 cp general/leap1 dir/subdir/Makefile &&
  62                 echo toplevel makefile >>dir/subdir/Makefile &&
  63                 echo f >dir/subdir/tweaked/f &&
  64                 echo g >dir/subdir/tweaked/g &&
  65                 echo h >dir/subdir/tweaked/h &&
  66                 echo subdirectory makefile >dir/subdir/tweaked/Makefile &&
  67                 for i in $(test_seq 1 88)
  68                 do
  69                         echo content $i >dir/unchanged/file_$i
  70                 done &&
  71                 git add . &&
  72                 git commit -m "O" &&
  73
  74                 git branch O &&
  75                 git branch A &&
  76                 git branch B-single &&
  77                 git branch B-dir &&
  78                 git branch B-many &&
  79
  80                 git switch A &&
  81
  82                 git rm general/leap* &&
  83                 mkdir general/ &&
  84                 test_seq 1 9 >general/jump1 &&
  85                 cp general/jump1 general/jump2 &&
  86                 echo leap2 >>general/jump2 &&
  87
  88                 rm basename/numbers basename/sequence basename/values &&
  89                 mkdir -p basename/subdir/
  90                 cp general/jump1 basename/subdir/numbers &&
  91                 cp general/jump1 basename/subdir/sequence &&
  92                 cp general/jump1 basename/subdir/values &&
  93                 echo numbers >>basename/subdir/numbers &&
  94                 echo sequence >>basename/subdir/sequence &&
  95                 echo values >>basename/subdir/values &&
  96
  97                 git rm dir/subdir/tweaked/f &&
  98                 echo more >>dir/subdir/e &&
  99                 echo more >>dir/subdir/Makefile &&
 100                 echo more >>dir/subdir/tweaked/Makefile &&
 101                 mkdir dir/subdir/newsubdir &&
 102                 echo rust code >dir/subdir/newsubdir/newfile.rs &&
 103                 git mv dir/subdir/e dir/subdir/newsubdir/ &&
 104                 git mv dir folder &&
 105                 git add . &&
 106                 git commit -m "A" &&
 107
 108                 git switch B-single &&
 109                 echo new first line >dir/subdir/Makefile &&
 110                 cat general/leap1 >>dir/subdir/Makefile &&
 111                 echo toplevel makefile >>dir/subdir/Makefile &&
 112                 echo perl code >general/newfile.pl &&
 113                 git add . &&
 114                 git commit -m "B-single" &&
 115
 116                 git switch B-dir &&
 117                 echo java code >dir/subdir/newfile.java &&
 118                 echo scala code >dir/subdir/newfile.scala &&
 119                 echo groovy code >dir/subdir/newfile.groovy &&
 120                 git add . &&
 121                 git commit -m "B-dir" &&
 122
 123                 git switch B-many &&
 124                 test_seq 2 10 >general/leap1 &&
 125                 rm general/leap2 &&
 126                 cp general/leap1 general/leap2 &&
 127                 echo leap2 >>general/leap2 &&
 128
 129                 rm basename/numbers basename/sequence basename/values &&
 130                 mkdir -p basename/subdir/
 131                 cp general/leap1 basename/subdir/numbers &&
 132                 cp general/leap1 basename/subdir/sequence &&
 133                 cp general/leap1 basename/subdir/values &&
 134                 echo numbers >>basename/subdir/numbers &&
 135                 echo sequence >>basename/subdir/sequence &&
 136                 echo values >>basename/subdir/values &&
 137
 138                 mkdir dir/subdir/newsubdir/ &&
 139                 echo c code >dir/subdir/newfile.c &&
 140                 echo python code >dir/subdir/newsubdir/newfile.py &&
 141                 git add . &&
 142                 git commit -m "B-many" &&
 143
 144                 git switch A
 145         )
 146 }
 147
 148 # Testcase: Objects downloaded for single relevant rename
 149 #   Commit O:
 150 #              general/{leap1_O, leap2_O}
 151 #              basename/{numbers_O, sequence_O, values_O}
 152 #              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
 153 #              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
 154 #              dir/unchanged/<LOTS OF FILES>
 155 #   Commit A:
 156 #     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/
 157 #      -> folder/, move e into newsubdir, add newfile.rs, remove f, modify
 158 #      both both Makefiles and jumps)
 159 #              general/{jump1_A, jump2_A}
 160 #              basename/subdir/{numbers_A, sequence_A, values_A}
 161 #              folder/subdir/{a,b,c,d,Makefile_TOP_A}
 162 #              folder/subdir/newsubdir/{e_A,newfile.rs}
 163 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
 164 #              folder/unchanged/<LOTS OF FILES>
 165 #   Commit B(-single):
 166 #     (add newfile.pl, tweak Makefile_TOP)
 167 #              general/{leap1_O, leap2_O,newfile.pl}
 168 #              basename/{numbers_O, sequence_O, values_O}
 169 #              dir/{a,b,c,d,e_O,Makefile_TOP_B}
 170 #              dir/tweaked/{f,g,h,Makefile_SUB_O}
 171 #              dir/unchanged/<LOTS OF FILES>
 172 #   Expected:
 173 #              general/{jump1_A, jump2_A,newfile.pl}
 174 #              basename/subdir/{numbers_A, sequence_A, values_A}
 175 #              folder/subdir/{a,b,c,d,Makefile_TOP_Merged}
 176 #              folder/subdir/newsubdir/{e_A,newfile.rs}
 177 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
 178 #              folder/unchanged/<LOTS OF FILES>
 179 #
 180 # Objects that need to be fetched:
 181 #   Rename detection:
 182 #     Side1 (O->A):
 183 #       Basename-matches rename detection only needs to fetch these objects:
 184 #         Makefile_TOP_O, Makefile_TOP_A
 185 #         (Despite many renames, all others are content irrelevant.  They
 186 #          are also location irrelevant because newfile.rs was added on
 187 #          the side doing the directory rename, and newfile.pl was added to
 188 #          a directory that was not renamed on either side.)
 189 #       General rename detection only needs to fetch these objects:
 190 #         <None>
 191 #          (Even though newfile.rs, jump[12], basename/subdir/*, and e
 192 #          could all be used as destinations in rename detection, the
 193 #          basename detection for Makefile matches up all relevant
 194 #          sources, so these other files never end up needing to be
 195 #          used)
 196 #     Side2 (O->B):
 197 #       Basename-matches rename detection only needs to fetch these objects:
 198 #         <None>
 199 #         (there are no deleted files, so no possible sources)
 200 #       General rename detection only needs to fetch these objects:
 201 #         <None>
 202 #         (there are no deleted files, so no possible sources)
 203 #   Merge:
 204 #     3-way content merge needs to grab these objects:
 205 #       Makefile_TOP_B
 206 #   Nothing else needs to fetch objects
 207 #
 208 #   Summary: 2 fetches (1 for 2 objects, 1 for 1 object)
 209 #
 210 test_expect_merge_algorithm failure success 'Objects downloaded for single relevant rename' '
 211         test_setup_repo &&
 212         git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-single &&
 213         (
 214                 cd objects-single &&
 215
 216                 git rev-list --objects --all --missing=print |
 217                         grep "^?" | sort >missing-objects-before &&
 218
 219                 git checkout -q origin/A &&
 220
 221                 GIT_TRACE2_PERF="$(pwd)/trace.output" git \
 222                         -c merge.directoryRenames=true merge --no-stat \
 223                         --no-progress origin/B-single &&
 224
 225                 # Check the number of objects we reported we would fetch
 226                 cat >expect <<-EOF &&
 227                 fetch_count:2
 228                 fetch_count:1
 229                 EOF
 230                 grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
 231                 test_cmp expect actual &&
 232
 233                 # Check the number of fetch commands exec-ed
 234                 grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
 235                 test_line_count = 2 fetches &&
 236
 237                 git rev-list --objects --all --missing=print |
 238                         grep "^?" | sort >missing-objects-after &&
 239                 comm -2 -3 missing-objects-before missing-objects-after >old &&
 240                 comm -1 -3 missing-objects-before missing-objects-after >new &&
 241                 # No new missing objects
 242                 test_must_be_empty new &&
 243                 # Fetched 2 + 1 = 3 objects
 244                 test_line_count = 3 old
 245         )
 246 '
 247
 248 # Testcase: Objects downloaded for directory rename
 249 #   Commit O:
 250 #              general/{leap1_O, leap2_O}
 251 #              basename/{numbers_O, sequence_O, values_O}
 252 #              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
 253 #              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
 254 #              dir/unchanged/<LOTS OF FILES>
 255 #   Commit A:
 256 #     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/ ->
 257 #      folder/, move e into newsubdir, add newfile.rs, remove f, modify
 258 #      both Makefiles and jumps)
 259 #              general/{jump1_A, jump2_A}
 260 #              basename/subdir/{numbers_A, sequence_A, values_A}
 261 #              folder/subdir/{a,b,c,d,Makefile_TOP_A}
 262 #              folder/subdir/newsubdir/{e_A,newfile.rs}
 263 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
 264 #              folder/unchanged/<LOTS OF FILES>
 265 #   Commit B(-dir):
 266 #     (add dir/subdir/newfile.{java,scala,groovy}
 267 #              general/{leap1_O, leap2_O}
 268 #              basename/{numbers_O, sequence_O, values_O}
 269 #              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O,
 270 #                          newfile.java,newfile.scala,newfile.groovy}
 271 #              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
 272 #              dir/unchanged/<LOTS OF FILES>
 273 #   Expected:
 274 #              general/{jump1_A, jump2_A}
 275 #              basename/subdir/{numbers_A, sequence_A, values_A}
 276 #              folder/subdir/{a,b,c,d,Makefile_TOP_A,
 277 #                             newfile.java,newfile.scala,newfile.groovy}
 278 #              folder/subdir/newsubdir/{e_A,newfile.rs}
 279 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
 280 #              folder/unchanged/<LOTS OF FILES>
 281 #
 282 # Objects that need to be fetched:
 283 #   Makefile_TOP_O, Makefile_TOP_A
 284 #   Makefile_SUB_O, Makefile_SUB_A
 285 #   e_O, e_A
 286 #   * Despite A's rename of jump->leap, those renames are irrelevant.
 287 #   * Despite A's rename of basename/ -> basename/subdir/, those renames are
 288 #     irrelevant.
 289 #   * Because of A's rename of dir/ -> folder/ and B-dir's addition of
 290 #     newfile.* into dir/subdir/, we need to determine directory renames.
 291 #     (Technically, there are enough exact renames to determine directory
 292 #      rename detection, but the current implementation always does
 293 #      basename searching before directory rename detection.  Running it
 294 #      also before basename searching would mean doing directory rename
 295 #      detection twice, but it's a bit expensive to do that and cases like
 296 #      this are not all that common.)
 297 #   Summary: 1 fetches for 6 objects
 298 #
 299 test_expect_merge_algorithm failure success 'Objects downloaded when a directory rename triggered' '
 300         test_setup_repo &&
 301         git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-dir &&
 302         (
 303                 cd objects-dir &&
 304
 305                 git rev-list --objects --all --missing=print |
 306                         grep "^?" | sort >missing-objects-before &&
 307
 308                 git checkout -q origin/A &&
 309
 310                 GIT_TRACE2_PERF="$(pwd)/trace.output" git \
 311                         -c merge.directoryRenames=true merge --no-stat \
 312                         --no-progress origin/B-dir &&
 313
 314                 # Check the number of objects we reported we would fetch
 315                 cat >expect <<-EOF &&
 316                 fetch_count:6
 317                 EOF
 318                 grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
 319                 test_cmp expect actual &&
 320
 321                 # Check the number of fetch commands exec-ed
 322                 grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
 323                 test_line_count = 1 fetches &&
 324
 325                 git rev-list --objects --all --missing=print |
 326                         grep "^?" | sort >missing-objects-after &&
 327                 comm -2 -3 missing-objects-before missing-objects-after >old &&
 328                 comm -1 -3 missing-objects-before missing-objects-after >new &&
 329                 # No new missing objects
 330                 test_must_be_empty new &&
 331                 # Fetched 6 objects
 332                 test_line_count = 6 old
 333         )
 334 '
 335
 336 # Testcase: Objects downloaded with lots of renames and modifications
 337 #   Commit O:
 338 #              general/{leap1_O, leap2_O}
 339 #              basename/{numbers_O, sequence_O, values_O}
 340 #              dir/subdir/{a,b,c,d,e_O,Makefile_TOP_O}
 341 #              dir/subdir/tweaked/{f,g,h,Makefile_SUB_O}
 342 #              dir/unchanged/<LOTS OF FILES>
 343 #   Commit A:
 344 #     (Rename leap->jump, rename basename/ -> basename/subdir/, rename dir/
 345 #      -> folder/, move e into newsubdir, add newfile.rs, remove f, modify
 346 #      both both Makefiles and jumps)
 347 #              general/{jump1_A, jump2_A}
 348 #              basename/subdir/{numbers_A, sequence_A, values_A}
 349 #              folder/subdir/{a,b,c,d,Makefile_TOP_A}
 350 #              folder/subdir/newsubdir/{e_A,newfile.rs}
 351 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A}
 352 #              folder/unchanged/<LOTS OF FILES>
 353 #   Commit B(-minimal):
 354 #     (modify both leaps, rename basename/ -> basename/subdir/, add
 355 #      newfile.{c,py})
 356 #              general/{leap1_B, leap2_B}
 357 #              basename/subdir/{numbers_B, sequence_B, values_B}
 358 #              dir/{a,b,c,d,e_O,Makefile_TOP_O,newfile.c}
 359 #              dir/tweaked/{f,g,h,Makefile_SUB_O,newfile.py}
 360 #              dir/unchanged/<LOTS OF FILES>
 361 #   Expected:
 362 #              general/{jump1_Merged, jump2_Merged}
 363 #              basename/subdir/{numbers_Merged, sequence_Merged, values_Merged}
 364 #              folder/subdir/{a,b,c,d,Makefile_TOP_A,newfile.c}
 365 #              folder/subdir/newsubdir/e_A
 366 #              folder/subdir/tweaked/{g,h,Makefile_SUB_A,newfile.py}
 367 #              folder/unchanged/<LOTS OF FILES>
 368 #
 369 # Objects that need to be fetched:
 370 #   Rename detection:
 371 #     Side1 (O->A):
 372 #       Basename-matches rename detection only needs to fetch these objects:
 373 #         numbers_O, numbers_A
 374 #         sequence_O, sequence_A
 375 #         values_O, values_A
 376 #         Makefile_TOP_O, Makefile_TOP_A
 377 #         Makefile_SUB_O, Makefile_SUB_A
 378 #         e_O, e_A
 379 #       General rename detection only needs to fetch these objects:
 380 #         leap1_O, leap2_O
 381 #         jump1_A, jump2_A, newfile.rs
 382 #         (only need remaining relevant sources, but any relevant sources need
 383 #          to be matched against all possible unpaired destinations)
 384 #     Side2 (O->B):
 385 #       Basename-matches rename detection only needs to fetch these objects:
 386 #         numbers_B
 387 #         sequence_B
 388 #         values_B
 389 #       (because numbers_O, sequence_O, and values_O already fetched above)
 390 #       General rename detection only needs to fetch these objects:
 391 #         <None>
 392 #   Merge:
 393 #     3-way content merge needs to grab these objects:
 394 #       leap1_B
 395 #       leap2_B
 396 #   Nothing else needs to fetch objects
 397 #
 398 #   Summary: 4 fetches (1 for 6 objects, 1 for 8, 1 for 3, 1 for 2)
 399 #
 400 test_expect_merge_algorithm failure success 'Objects downloaded with lots of renames and modifications' '
 401         test_setup_repo &&
 402         git clone --sparse --filter=blob:none "file://$(pwd)/server" objects-many &&
 403         (
 404                 cd objects-many &&
 405
 406                 git rev-list --objects --all --missing=print |
 407                         grep "^?" | sort >missing-objects-before &&
 408
 409                 git checkout -q origin/A &&
 410
 411                 GIT_TRACE2_PERF="$(pwd)/trace.output" git \
 412                         -c merge.directoryRenames=true merge --no-stat \
 413                         --no-progress origin/B-many &&
 414
 415                 # Check the number of objects we reported we would fetch
 416                 cat >expect <<-EOF &&
 417                 fetch_count:12
 418                 fetch_count:5
 419                 fetch_count:3
 420                 fetch_count:2
 421                 EOF
 422                 grep fetch_count trace.output | cut -d "|" -f 9 | tr -d " ." >actual &&
 423                 test_cmp expect actual &&
 424
 425                 # Check the number of fetch commands exec-ed
 426                 grep d0.*fetch.negotiationAlgorithm trace.output >fetches &&
 427                 test_line_count = 4 fetches &&
 428
 429                 git rev-list --objects --all --missing=print |
 430                         grep "^?" | sort >missing-objects-after &&
 431                 comm -2 -3 missing-objects-before missing-objects-after >old &&
 432                 comm -1 -3 missing-objects-before missing-objects-after >new &&
 433                 # No new missing objects
 434                 test_must_be_empty new &&
 435                 # Fetched 12 + 5 + 3 + 2 = 22 objects
 436                 test_line_count = 22 old
 437         )
 438 '
 439
 440 test_done