t/t4008-diff-break-rewrite.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Junio C Hamano
   4 #
   5
   6 test_description='Break and then rename
   7
   8 We have two very different files, file0 and file1, registered in a tree.
   9
  10 We update file1 so drastically that it is more similar to file0, and
  11 then remove file0.  With -B, changes to file1 should be broken into
  12 separate delete and create, resulting in removal of file0, removal of
  13 original file1 and creation of completely rewritten file1.  The latter
  14 two are then merged back into a single "complete rewrite".
  15
  16 Further, with -B and -M together, these three modifications should
  17 turn into rename-edit of file0 into file1.
  18
  19 Starting from the same two files in the tree, we swap file0 and file1.
  20 With -B, this should be detected as two complete rewrites.
  21
  22 Further, with -B and -M together, these should turn into two renames.
  23 '
  24 . ./test-lib.sh
  25 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
  26
  27 test_expect_success setup '
  28         cat "$TEST_DIRECTORY"/lib-diff/README >file0 &&
  29         cat "$TEST_DIRECTORY"/lib-diff/COPYING >file1 &&
  30         blob0_id=$(git hash-object file0) &&
  31         blob1_id=$(git hash-object file1) &&
  32         git update-index --add file0 file1 &&
  33         git tag reference $(git write-tree)
  34 '
  35
  36 test_expect_success 'change file1 with copy-edit of file0 and remove file0' '
  37         sed -e "s/git/GIT/" file0 >file1 &&
  38         blob2_id=$(git hash-object file1) &&
  39         rm -f file0 &&
  40         git update-index --remove file0 file1
  41 '
  42
  43 test_expect_success 'run diff with -B (#1)' '
  44         git diff-index -B --cached reference >current &&
  45         cat >expect <<-EOF &&
  46         :100644 000000 $blob0_id $ZERO_OID D    file0
  47         :100644 100644 $blob1_id $blob2_id M100 file1
  48         EOF
  49         compare_diff_raw expect current
  50 '
  51
  52 test_expect_success 'run diff with -B and -M (#2)' '
  53         git diff-index -B -M reference >current &&
  54         cat >expect <<-EOF &&
  55         :100644 100644 $blob0_id $blob2_id R100 file0   file1
  56         EOF
  57         compare_diff_raw expect current
  58 '
  59
  60 test_expect_success 'swap file0 and file1' '
  61         rm -f file0 file1 &&
  62         git read-tree -m reference &&
  63         git checkout-index -f -u -a &&
  64         mv file0 tmp &&
  65         mv file1 file0 &&
  66         mv tmp file1 &&
  67         git update-index file0 file1
  68 '
  69
  70 test_expect_success 'run diff with -B (#3)' '
  71         git diff-index -B reference >current &&
  72         cat >expect <<-EOF &&
  73         :100644 100644 $blob0_id $blob1_id M100 file0
  74         :100644 100644 $blob1_id $blob0_id M100 file1
  75         EOF
  76         compare_diff_raw expect current
  77 '
  78
  79 test_expect_success 'run diff with -B and -M (#4)' '
  80         git diff-index -B -M reference >current &&
  81         cat >expect <<-EOF &&
  82         :100644 100644 $blob1_id $blob1_id R100 file1   file0
  83         :100644 100644 $blob0_id $blob0_id R100 file0   file1
  84         EOF
  85         compare_diff_raw expect current
  86 '
  87
  88 test_expect_success 'make file0 into something completely different' '
  89         rm -f file0 &&
  90         test_ln_s_add frotz file0 &&
  91         slink_id=$(printf frotz | git hash-object --stdin) &&
  92         git update-index file1
  93 '
  94
  95 test_expect_success 'run diff with -B (#5)' '
  96         git diff-index -B reference >current &&
  97         cat >expect <<-EOF &&
  98         :100644 120000 $blob0_id $slink_id T    file0
  99         :100644 100644 $blob1_id $blob0_id M100 file1
 100         EOF
 101         compare_diff_raw expect current
 102 '
 103
 104 test_expect_success 'run diff with -B -M (#6)' '
 105         git diff-index -B -M reference >current &&
 106
 107         # file0 changed from regular to symlink.  file1 is the same as the preimage
 108         # of file0.  Because the change does not make file0 disappear, file1 is
 109         # denoted as a copy of file0
 110         cat >expect <<-EOF &&
 111         :100644 120000 $blob0_id $slink_id T    file0
 112         :100644 100644 $blob0_id $blob0_id C    file0   file1
 113         EOF
 114         compare_diff_raw expect current
 115 '
 116
 117 test_expect_success 'run diff with -M (#7)' '
 118         git diff-index -M reference >current &&
 119
 120         # This should not mistake file0 as the copy source of new file1
 121         # due to type differences.
 122         cat >expect <<-EOF &&
 123         :100644 120000 $blob0_id $slink_id T    file0
 124         :100644 100644 $blob1_id $blob0_id M    file1
 125         EOF
 126         compare_diff_raw expect current
 127 '
 128
 129 test_expect_success 'file1 edited to look like file0 and file0 rename-edited to file2' '
 130         rm -f file0 file1 &&
 131         git read-tree -m reference &&
 132         git checkout-index -f -u -a &&
 133         sed -e "s/git/GIT/" file0 >file1 &&
 134         sed -e "s/git/GET/" file0 >file2 &&
 135         blob3_id=$(git hash-object file2) &&
 136         rm -f file0 &&
 137         git update-index --add --remove file0 file1 file2
 138 '
 139
 140 test_expect_success 'run diff with -B (#8)' '
 141         git diff-index -B reference >current &&
 142         cat >expect <<-EOF &&
 143         :100644 000000 $blob0_id $ZERO_OID D    file0
 144         :100644 100644 $blob1_id $blob2_id M100 file1
 145         :000000 100644 $ZERO_OID $blob3_id A    file2
 146         EOF
 147         compare_diff_raw expect current
 148 '
 149
 150 test_expect_success 'run diff with -B -C (#9)' '
 151         git diff-index -B -C reference >current &&
 152         cat >expect <<-EOF &&
 153         :100644 100644 $blob0_id $blob2_id C095 file0   file1
 154         :100644 100644 $blob0_id $blob3_id R095 file0   file2
 155         EOF
 156         compare_diff_raw expect current
 157 '
 158
 159 test_done