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 . ./test-lib.sh
  24
  25 test_expect_success 'blob and tree' '
  26         test_tick &&
  27         (
  28                 for i in 0 1 2 3 4 5 6 7 8 9
  29                 do
  30                         echo $i
  31                 done
  32                 echo
  33                 echo b1rwzyc3
  34         ) >a0blgqsjc &&
  35
  36         # create one blob 0000000000b36
  37         git add a0blgqsjc &&
  38
  39         # create one tree 0000000000cdc
  40         git write-tree
  41 '
  42
  43 test_expect_success 'warn ambiguity when no candidate matches type hint' '
  44         test_must_fail git rev-parse --verify 000000000^{commit} 2>actual &&
  45         grep "short SHA1 000000000 is ambiguous" actual
  46 '
  47
  48 test_expect_success 'disambiguate tree-ish' '
  49         # feed tree-ish in an unambiguous way
  50         git rev-parse --verify 0000000000cdc:a0blgqsjc &&
  51
  52         # ambiguous at the object name level, but there is only one
  53         # such tree-ish (the other is a blob)
  54         git rev-parse --verify 000000000:a0blgqsjc
  55 '
  56
  57 test_expect_success 'disambiguate blob' '
  58         sed -e "s/|$//" >patch <<-EOF &&
  59         diff --git a/frotz b/frotz
  60         index 000000000..ffffff 100644
  61         --- a/frotz
  62         +++ b/frotz
  63         @@ -10,3 +10,4 @@
  64          9
  65          |
  66          b1rwzyc3
  67         +irwry
  68         EOF
  69         (
  70                 GIT_INDEX_FILE=frotz &&
  71                 export GIT_INDEX_FILE &&
  72                 git apply --build-fake-ancestor frotz patch &&
  73                 git cat-file blob :frotz >actual
  74         ) &&
  75         test_cmp a0blgqsjc actual
  76 '
  77
  78 test_expect_success 'disambiguate tree' '
  79         commit=$(echo "d7xm" | git commit-tree 000000000) &&
  80         # this commit is fffff2e and not ambiguous with the 00000* objects
  81         test $(git rev-parse $commit^{tree}) = $(git rev-parse 0000000000cdc)
  82 '
  83
  84 test_expect_success 'first commit' '
  85         # create one commit 0000000000e4f
  86         git commit -m a2onsxbvj
  87 '
  88
  89 test_expect_success 'disambiguate commit-ish' '
  90         # feed commit-ish in an unambiguous way
  91         git rev-parse --verify 0000000000e4f^{commit} &&
  92
  93         # ambiguous at the object name level, but there is only one
  94         # such commit (the others are tree and blob)
  95         git rev-parse --verify 000000000^{commit} &&
  96
  97         # likewise
  98         git rev-parse --verify 000000000^0
  99 '
 100
 101 test_expect_success 'disambiguate commit' '
 102         commit=$(echo "hoaxj" | git commit-tree 0000000000cdc -p 000000000) &&
 103         # this commit is ffffffd8 and not ambiguous with the 00000* objects
 104         test $(git rev-parse $commit^) = $(git rev-parse 0000000000e4f)
 105 '
 106
 107 test_expect_success 'log name1..name2 takes only commit-ishes on both ends' '
 108         # These are underspecified from the prefix-length point of view
 109         # to disambiguate the commit with other objects, but there is only
 110         # one commit that has 00000* prefix at this point.
 111         git log 000000000..000000000 &&
 112         git log ..000000000 &&
 113         git log 000000000.. &&
 114         git log 000000000...000000000 &&
 115         git log ...000000000 &&
 116         git log 000000000...
 117 '
 118
 119 test_expect_success 'rev-parse name1..name2 takes only commit-ishes on both ends' '
 120         # Likewise.
 121         git rev-parse 000000000..000000000 &&
 122         git rev-parse ..000000000 &&
 123         git rev-parse 000000000..
 124 '
 125
 126 test_expect_success 'git log takes only commit-ish' '
 127         # Likewise.
 128         git log 000000000
 129 '
 130
 131 test_expect_success 'git reset takes only commit-ish' '
 132         # Likewise.
 133         git reset 000000000
 134 '
 135
 136 test_expect_success 'first tag' '
 137         # create one tag 0000000000f8f
 138         git tag -a -m j7cp83um v1.0.0
 139 '
 140
 141 test_expect_failure 'two semi-ambiguous commit-ish' '
 142         # At this point, we have a tag 0000000000f8f that points
 143         # at a commit 0000000000e4f, and a tree and a blob that
 144         # share 0000000000 prefix with these tag and commit.
 145         #
 146         # Once the parser becomes ultra-smart, it could notice that
 147         # 0000000000 before ^{commit} name many different objects, but
 148         # that only two (HEAD and v1.0.0 tag) can be peeled to commit,
 149         # and that peeling them down to commit yield the same commit
 150         # without ambiguity.
 151         git rev-parse --verify 0000000000^{commit} &&
 152
 153         # likewise
 154         git log 0000000000..0000000000 &&
 155         git log ..0000000000 &&
 156         git log 0000000000.. &&
 157         git log 0000000000...0000000000 &&
 158         git log ...0000000000 &&
 159         git log 0000000000...
 160 '
 161
 162 test_expect_failure 'three semi-ambiguous tree-ish' '
 163         # Likewise for tree-ish.  HEAD, v1.0.0 and HEAD^{tree} share
 164         # the prefix but peeling them to tree yields the same thing
 165         git rev-parse --verify 0000000000^{tree}
 166 '
 167
 168 test_expect_success 'parse describe name' '
 169         # feed an unambiguous describe name
 170         git rev-parse --verify v1.0.0-0-g0000000000e4f &&
 171
 172         # ambiguous at the object name level, but there is only one
 173         # such commit (others are blob, tree and tag)
 174         git rev-parse --verify v1.0.0-0-g000000000
 175 '
 176
 177 test_expect_success 'more history' '
 178         # commit 0000000000043
 179         git mv a0blgqsjc d12cr3h8t &&
 180         echo h62xsjeu >>d12cr3h8t &&
 181         git add d12cr3h8t &&
 182
 183         test_tick &&
 184         git commit -m czy8f73t &&
 185
 186         # commit 00000000008ec
 187         git mv d12cr3h8t j000jmpzn &&
 188         echo j08bekfvt >>j000jmpzn &&
 189         git add j000jmpzn &&
 190
 191         test_tick &&
 192         git commit -m ioiley5o &&
 193
 194         # commit 0000000005b0
 195         git checkout v1.0.0^0 &&
 196         git mv a0blgqsjc f5518nwu &&
 197
 198         for i in h62xsjeu j08bekfvt kg7xflhm
 199         do
 200                 echo $i
 201         done >>f5518nwu &&
 202         git add f5518nwu &&
 203
 204         test_tick &&
 205         git commit -m b3wettvi &&
 206         side=$(git rev-parse HEAD) &&
 207
 208         # commit 000000000066
 209         git checkout master &&
 210
 211         # If you use recursive, merge will fail and you will need to
 212         # clean up a0blgqsjc as well.  If you use resolve, merge will
 213         # succeed.
 214         test_might_fail git merge --no-commit -s recursive $side &&
 215         git rm -f f5518nwu j000jmpzn &&
 216
 217         test_might_fail git rm -f a0blgqsjc &&
 218         (
 219                 git cat-file blob $side:f5518nwu
 220                 echo j3l0i9s6
 221         ) >ab2gs879 &&
 222         git add ab2gs879 &&
 223
 224         test_tick &&
 225         git commit -m ad2uee
 226
 227 '
 228
 229 test_expect_failure 'parse describe name taking advantage of generation' '
 230         # ambiguous at the object name level, but there is only one
 231         # such commit at generation 0
 232         git rev-parse --verify v1.0.0-0-g000000000 &&
 233
 234         # likewise for generation 2 and 4
 235         git rev-parse --verify v1.0.0-2-g000000000 &&
 236         git rev-parse --verify v1.0.0-4-g000000000
 237 '
 238
 239 # Note: because rev-parse does not even try to disambiguate based on
 240 # the generation number, this test currently succeeds for a wrong
 241 # reason.  When it learns to use the generation number, the previous
 242 # test should succeed, and also this test should fail because the
 243 # describe name used in the test with generation number can name two
 244 # commits.  Make sure that such a future enhancement does not randomly
 245 # pick one.
 246 test_expect_success 'parse describe name not ignoring ambiguity' '
 247         # ambiguous at the object name level, and there are two such
 248         # commits at generation 1
 249         test_must_fail git rev-parse --verify v1.0.0-1-g000000000
 250 '
 251
 252 test_expect_success 'ambiguous commit-ish' '
 253         # Now there are many commits that begin with the
 254         # common prefix, none of these should pick one at
 255         # random.  They all should result in ambiguity errors.
 256         test_must_fail git rev-parse --verify 00000000^{commit} &&
 257
 258         # likewise
 259         test_must_fail git log 000000000..000000000 &&
 260         test_must_fail git log ..000000000 &&
 261         test_must_fail git log 000000000.. &&
 262         test_must_fail git log 000000000...000000000 &&
 263         test_must_fail git log ...000000000 &&
 264         test_must_fail git log 000000000...
 265 '
 266
 267 test_expect_success 'rev-parse --disambiguate' '
 268         # The test creates 16 objects that share the prefix and two
 269         # commits created by commit-tree in earlier tests share a
 270         # different prefix.
 271         git rev-parse --disambiguate=000000000 >actual &&
 272         test $(wc -l <actual) = 16 &&
 273         test "$(sed -e "s/^\(.........\).*/\1/" actual | sort -u)" = 000000000
 274 '
 275
 276 test_expect_success 'ambiguous 40-hex ref' '
 277         TREE=$(git mktree </dev/null) &&
 278         REF=`git rev-parse HEAD` &&
 279         VAL=$(git commit-tree $TREE </dev/null) &&
 280         git update-ref refs/heads/$REF $VAL &&
 281         test `git rev-parse $REF 2>err` = $REF &&
 282         grep "refname.*${REF}.*ambiguous" err
 283 '
 284
 285 test_expect_success 'ambiguous short sha1 ref' '
 286         TREE=$(git mktree </dev/null) &&
 287         REF=`git rev-parse --short HEAD` &&
 288         VAL=$(git commit-tree $TREE </dev/null) &&
 289         git update-ref refs/heads/$REF $VAL &&
 290         test `git rev-parse $REF 2>err` = $VAL &&
 291         grep "refname.*${REF}.*ambiguous" err
 292 '
 293
 294 test_done