t/t1512-rev-parse-disambiguation.sh

   1 #!/bin/sh
   2
   3 test_description='object name disambiguation
   4
   5 Create blobs, trees, commits and a tag that all share the same
   6 prefix, and make sure "git rev-parse" can take advantage of
   7 type information to disambiguate short object names that are
   8 not necessarily unique.
   9
  10 The final history used in the test has five commits, with the bottom
  11 one tagged as v1.0.0.  They all have one regular file each.
  12
  13   +-------------------------------------------+
  14   |                                           |
  15   |           .-------b3wettvi---- ad2uee     |
  16   |          /                   /            |
  17   |  a2onsxbvj---czy8f73t--ioiley5o           |
  18   |                                           |
  19   +-------------------------------------------+
  20
  21 '
  22
  23 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
  24 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
  25
  26 . ./test-lib.sh
  27
  28 if ! test_have_prereq SHA1
  29 then
  30         skip_all='not using SHA-1 for objects'
  31         test_done
  32 fi
  33
  34 test_expect_success 'blob and tree' '
  35         test_tick &&
  36         (
  37                 test_write_lines 0 1 2 3 4 5 6 7 8 9 &&
  38                 echo &&
  39                 echo b1rwzyc3
  40         ) >a0blgqsjc &&
  41
  42         # create one blob 0000000000b36
  43         git add a0blgqsjc &&
  44
  45         # create one tree 0000000000cdc
  46         git write-tree
  47 '
  48
  49 test_expect_success 'warn ambiguity when no candidate matches type hint' '
  50         test_must_fail git rev-parse --verify 000000000^{commit} 2>actual &&
  51         test_i18ngrep "short object ID 000000000 is ambiguous" actual
  52 '
  53
  54 test_expect_success 'disambiguate tree-ish' '
  55         # feed tree-ish in an unambiguous way
  56         git rev-parse --verify 0000000000cdc:a0blgqsjc &&
  57
  58         # ambiguous at the object name level, but there is only one
  59         # such tree-ish (the other is a blob)
  60         git rev-parse --verify 000000000:a0blgqsjc
  61 '
  62
  63 test_expect_success 'disambiguate blob' '
  64         sed -e "s/|$//" >patch <<-EOF &&
  65         diff --git a/frotz b/frotz
  66         index 000000000..ffffff 100644
  67         --- a/frotz
  68         +++ b/frotz
  69         @@ -10,3 +10,4 @@
  70          9
  71          |
  72          b1rwzyc3
  73         +irwry
  74         EOF
  75         (
  76                 GIT_INDEX_FILE=frotz &&
  77                 export GIT_INDEX_FILE &&
  78                 git apply --build-fake-ancestor frotz patch &&
  79                 git cat-file blob :frotz >actual
  80         ) &&
  81         test_cmp a0blgqsjc actual
  82 '
  83
  84 test_expect_success 'disambiguate tree' '
  85         commit=$(echo "d7xm" | git commit-tree 000000000) &&
  86         # this commit is fffff2e and not ambiguous with the 00000* objects
  87         test $(git rev-parse $commit^{tree}) = $(git rev-parse 0000000000cdc)
  88 '
  89
  90 test_expect_success 'first commit' '
  91         # create one commit 0000000000e4f
  92         git commit -m a2onsxbvj
  93 '
  94
  95 test_expect_success 'disambiguate commit-ish' '
  96         # feed commit-ish in an unambiguous way
  97         git rev-parse --verify 0000000000e4f^{commit} &&
  98
  99         # ambiguous at the object name level, but there is only one
 100         # such commit (the others are tree and blob)
 101         git rev-parse --verify 000000000^{commit} &&
 102
 103         # likewise
 104         git rev-parse --verify 000000000^0
 105 '
 106
 107 test_expect_success 'disambiguate commit' '
 108         commit=$(echo "hoaxj" | git commit-tree 0000000000cdc -p 000000000) &&
 109         # this commit is ffffffd8 and not ambiguous with the 00000* objects
 110         test $(git rev-parse $commit^) = $(git rev-parse 0000000000e4f)
 111 '
 112
 113 test_expect_success 'log name1..name2 takes only commit-ishes on both ends' '
 114         # These are underspecified from the prefix-length point of view
 115         # to disambiguate the commit with other objects, but there is only
 116         # one commit that has 00000* prefix at this point.
 117         git log 000000000..000000000 &&
 118         git log ..000000000 &&
 119         git log 000000000.. &&
 120         git log 000000000...000000000 &&
 121         git log ...000000000 &&
 122         git log 000000000...
 123 '
 124
 125 test_expect_success 'rev-parse name1..name2 takes only commit-ishes on both ends' '
 126         # Likewise.
 127         git rev-parse 000000000..000000000 &&
 128         git rev-parse ..000000000 &&
 129         git rev-parse 000000000..
 130 '
 131
 132 test_expect_success 'git log takes only commit-ish' '
 133         # Likewise.
 134         git log 000000000
 135 '
 136
 137 test_expect_success 'git reset takes only commit-ish' '
 138         # Likewise.
 139         git reset 000000000
 140 '
 141
 142 test_expect_success 'first tag' '
 143         # create one tag 0000000000f8f
 144         git tag -a -m j7cp83um v1.0.0
 145 '
 146
 147 test_expect_failure 'two semi-ambiguous commit-ish' '
 148         # At this point, we have a tag 0000000000f8f that points
 149         # at a commit 0000000000e4f, and a tree and a blob that
 150         # share 0000000000 prefix with these tag and commit.
 151         #
 152         # Once the parser becomes ultra-smart, it could notice that
 153         # 0000000000 before ^{commit} name many different objects, but
 154         # that only two (HEAD and v1.0.0 tag) can be peeled to commit,
 155         # and that peeling them down to commit yield the same commit
 156         # without ambiguity.
 157         git rev-parse --verify 0000000000^{commit} &&
 158
 159         # likewise
 160         git log 0000000000..0000000000 &&
 161         git log ..0000000000 &&
 162         git log 0000000000.. &&
 163         git log 0000000000...0000000000 &&
 164         git log ...0000000000 &&
 165         git log 0000000000...
 166 '
 167
 168 test_expect_failure 'three semi-ambiguous tree-ish' '
 169         # Likewise for tree-ish.  HEAD, v1.0.0 and HEAD^{tree} share
 170         # the prefix but peeling them to tree yields the same thing
 171         git rev-parse --verify 0000000000^{tree}
 172 '
 173
 174 test_expect_success 'parse describe name' '
 175         # feed an unambiguous describe name
 176         git rev-parse --verify v1.0.0-0-g0000000000e4f &&
 177
 178         # ambiguous at the object name level, but there is only one
 179         # such commit (others are blob, tree and tag)
 180         git rev-parse --verify v1.0.0-0-g000000000
 181 '
 182
 183 test_expect_success 'more history' '
 184         # commit 0000000000043
 185         git mv a0blgqsjc d12cr3h8t &&
 186         echo h62xsjeu >>d12cr3h8t &&
 187         git add d12cr3h8t &&
 188
 189         test_tick &&
 190         git commit -m czy8f73t &&
 191
 192         # commit 00000000008ec
 193         git mv d12cr3h8t j000jmpzn &&
 194         echo j08bekfvt >>j000jmpzn &&
 195         git add j000jmpzn &&
 196
 197         test_tick &&
 198         git commit -m ioiley5o &&
 199
 200         # commit 0000000005b0
 201         git checkout v1.0.0^0 &&
 202         git mv a0blgqsjc f5518nwu &&
 203
 204         test_write_lines h62xsjeu j08bekfvt kg7xflhm >>f5518nwu &&
 205         git add f5518nwu &&
 206
 207         test_tick &&
 208         git commit -m b3wettvi &&
 209         side=$(git rev-parse HEAD) &&
 210
 211         # commit 000000000066
 212         git checkout main &&
 213
 214         # If you use recursive, merge will fail and you will need to
 215         # clean up a0blgqsjc as well.  If you use resolve, merge will
 216         # succeed.
 217         test_might_fail git merge --no-commit -s recursive $side &&
 218         git rm -f f5518nwu j000jmpzn &&
 219
 220         test_might_fail git rm -f a0blgqsjc &&
 221         (
 222                 git cat-file blob $side:f5518nwu &&
 223                 echo j3l0i9s6
 224         ) >ab2gs879 &&
 225         git add ab2gs879 &&
 226
 227         test_tick &&
 228         git commit -m ad2uee
 229
 230 '
 231
 232 test_expect_failure 'parse describe name taking advantage of generation' '
 233         # ambiguous at the object name level, but there is only one
 234         # such commit at generation 0
 235         git rev-parse --verify v1.0.0-0-g000000000 &&
 236
 237         # likewise for generation 2 and 4
 238         git rev-parse --verify v1.0.0-2-g000000000 &&
 239         git rev-parse --verify v1.0.0-4-g000000000
 240 '
 241
 242 # Note: because rev-parse does not even try to disambiguate based on
 243 # the generation number, this test currently succeeds for a wrong
 244 # reason.  When it learns to use the generation number, the previous
 245 # test should succeed, and also this test should fail because the
 246 # describe name used in the test with generation number can name two
 247 # commits.  Make sure that such a future enhancement does not randomly
 248 # pick one.
 249 test_expect_success 'parse describe name not ignoring ambiguity' '
 250         # ambiguous at the object name level, and there are two such
 251         # commits at generation 1
 252         test_must_fail git rev-parse --verify v1.0.0-1-g000000000
 253 '
 254
 255 test_expect_success 'ambiguous commit-ish' '
 256         # Now there are many commits that begin with the
 257         # common prefix, none of these should pick one at
 258         # random.  They all should result in ambiguity errors.
 259         test_must_fail git rev-parse --verify 00000000^{commit} &&
 260
 261         # likewise
 262         test_must_fail git log 000000000..000000000 &&
 263         test_must_fail git log ..000000000 &&
 264         test_must_fail git log 000000000.. &&
 265         test_must_fail git log 000000000...000000000 &&
 266         test_must_fail git log ...000000000 &&
 267         test_must_fail git log 000000000...
 268 '
 269
 270 # There are three objects with this prefix: a blob, a tree, and a tag. We know
 271 # the blob will not pass as a treeish, but the tree and tag should (and thus
 272 # cause an error).
 273 test_expect_success 'ambiguous tags peel to treeish' '
 274         test_must_fail git rev-parse 0000000000f^{tree}
 275 '
 276
 277 test_expect_success 'rev-parse --disambiguate' '
 278         # The test creates 16 objects that share the prefix and two
 279         # commits created by commit-tree in earlier tests share a
 280         # different prefix.
 281         git rev-parse --disambiguate=000000000 >actual &&
 282         test_line_count = 16 actual &&
 283         test "$(sed -e "s/^\(.........\).*/\1/" actual | sort -u)" = 000000000
 284 '
 285
 286 test_expect_success 'rev-parse --disambiguate drops duplicates' '
 287         git rev-parse --disambiguate=000000000 >expect &&
 288         git pack-objects .git/objects/pack/pack <expect &&
 289         git rev-parse --disambiguate=000000000 >actual &&
 290         test_cmp expect actual
 291 '
 292
 293 test_expect_success 'ambiguous 40-hex ref' '
 294         TREE=$(git mktree </dev/null) &&
 295         REF=$(git rev-parse HEAD) &&
 296         VAL=$(git commit-tree $TREE </dev/null) &&
 297         git update-ref refs/heads/$REF $VAL &&
 298         test $(git rev-parse $REF 2>err) = $REF &&
 299         grep "refname.*${REF}.*ambiguous" err
 300 '
 301
 302 test_expect_success 'ambiguous short sha1 ref' '
 303         TREE=$(git mktree </dev/null) &&
 304         REF=$(git rev-parse --short HEAD) &&
 305         VAL=$(git commit-tree $TREE </dev/null) &&
 306         git update-ref refs/heads/$REF $VAL &&
 307         test $(git rev-parse $REF 2>err) = $VAL &&
 308         grep "refname.*${REF}.*ambiguous" err
 309 '
 310
 311 test_expect_success 'ambiguity errors are not repeated (raw)' '
 312         test_must_fail git rev-parse 00000 2>stderr &&
 313         grep "is ambiguous" stderr >errors &&
 314         test_line_count = 1 errors
 315 '
 316
 317 test_expect_success 'ambiguity errors are not repeated (treeish)' '
 318         test_must_fail git rev-parse 00000:foo 2>stderr &&
 319         grep "is ambiguous" stderr >errors &&
 320         test_line_count = 1 errors
 321 '
 322
 323 test_expect_success 'ambiguity errors are not repeated (peel)' '
 324         test_must_fail git rev-parse 00000^{commit} 2>stderr &&
 325         grep "is ambiguous" stderr >errors &&
 326         test_line_count = 1 errors
 327 '
 328
 329 test_expect_success 'ambiguity hints' '
 330         test_must_fail git rev-parse 000000000 2>stderr &&
 331         grep ^hint: stderr >hints &&
 332         # 16 candidates, plus one intro line
 333         test_line_count = 17 hints
 334 '
 335
 336 test_expect_success 'ambiguity hints respect type' '
 337         test_must_fail git rev-parse 000000000^{commit} 2>stderr &&
 338         grep ^hint: stderr >hints &&
 339         # 5 commits, 1 tag (which is a committish), plus intro line
 340         test_line_count = 7 hints
 341 '
 342
 343 test_expect_success 'failed type-selector still shows hint' '
 344         # these two blobs share the same prefix "ee3d", but neither
 345         # will pass for a commit
 346         echo 851 | git hash-object --stdin -w &&
 347         echo 872 | git hash-object --stdin -w &&
 348         test_must_fail git rev-parse ee3d^{commit} 2>stderr &&
 349         grep ^hint: stderr >hints &&
 350         test_line_count = 3 hints
 351 '
 352
 353 test_expect_success 'core.disambiguate config can prefer types' '
 354         # ambiguous between tree and tag
 355         sha1=0000000000f &&
 356         test_must_fail git rev-parse $sha1 &&
 357         git rev-parse $sha1^{commit} &&
 358         git -c core.disambiguate=committish rev-parse $sha1
 359 '
 360
 361 test_expect_success 'core.disambiguate does not override context' '
 362         # treeish ambiguous between tag and tree
 363         test_must_fail \
 364                 git -c core.disambiguate=committish rev-parse $sha1^{tree}
 365 '
 366
 367 test_expect_success 'ambiguous commits are printed by type first, then hash order' '
 368         test_must_fail git rev-parse 0000 2>stderr &&
 369         grep ^hint: stderr >hints &&
 370         grep 0000 hints >objects &&
 371         cat >expected <<-\EOF &&
 372         tag
 373         commit
 374         tree
 375         blob
 376         EOF
 377         awk "{print \$3}" <objects >objects.types &&
 378         uniq <objects.types >objects.types.uniq &&
 379         test_cmp expected objects.types.uniq &&
 380         for type in tag commit tree blob
 381         do
 382                 grep $type objects >$type.objects &&
 383                 sort $type.objects >$type.objects.sorted &&
 384                 test_cmp $type.objects.sorted $type.objects || return 1
 385         done
 386 '
 387
 388 test_expect_success 'cat-file --batch and --batch-check show ambiguous' '
 389         echo "0000 ambiguous" >expect &&
 390         echo 0000 | git cat-file --batch-check >actual 2>err &&
 391         test_cmp expect actual &&
 392         test_i18ngrep hint: err &&
 393         echo 0000 | git cat-file --batch >actual 2>err &&
 394         test_cmp expect actual &&
 395         test_i18ngrep hint: err
 396 '
 397
 398 test_done