t/t6436-merge-overwrite.sh

   1 #!/bin/sh
   2
   3 test_description='git-merge
   4
   5 Do not overwrite changes.'
   6
   7 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
   8 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
   9
  10 . ./test-lib.sh
  11
  12 test_expect_success 'setup' '
  13         test_commit c0 c0.c &&
  14         test_commit c1 c1.c &&
  15         test_commit c1a c1.c "c1 a" &&
  16         git reset --hard c0 &&
  17         test_commit c2 c2.c &&
  18         git reset --hard c0 &&
  19         mkdir sub &&
  20         echo "sub/f" > sub/f &&
  21         mkdir sub2 &&
  22         echo "sub2/f" > sub2/f &&
  23         git add sub/f sub2/f &&
  24         git commit -m sub &&
  25         git tag sub &&
  26         echo "VERY IMPORTANT CHANGES" > important
  27 '
  28
  29 test_expect_success 'will not overwrite untracked file' '
  30         git reset --hard c1 &&
  31         cp important c2.c &&
  32         test_must_fail git merge c2 &&
  33         test_path_is_missing .git/MERGE_HEAD &&
  34         test_cmp important c2.c
  35 '
  36
  37 test_expect_success 'will overwrite tracked file' '
  38         git reset --hard c1 &&
  39         cp important c2.c &&
  40         git add c2.c &&
  41         git commit -m important &&
  42         git checkout c2
  43 '
  44
  45 test_expect_success 'will not overwrite new file' '
  46         git reset --hard c1 &&
  47         cp important c2.c &&
  48         git add c2.c &&
  49         test_must_fail git merge c2 &&
  50         test_path_is_missing .git/MERGE_HEAD &&
  51         test_cmp important c2.c
  52 '
  53
  54 test_expect_success 'will not overwrite staged changes' '
  55         git reset --hard c1 &&
  56         cp important c2.c &&
  57         git add c2.c &&
  58         rm c2.c &&
  59         test_must_fail git merge c2 &&
  60         test_path_is_missing .git/MERGE_HEAD &&
  61         git checkout c2.c &&
  62         test_cmp important c2.c
  63 '
  64
  65 test_expect_success 'will not overwrite removed file' '
  66         git reset --hard c1 &&
  67         git rm c1.c &&
  68         git commit -m "rm c1.c" &&
  69         cp important c1.c &&
  70         test_must_fail git merge c1a &&
  71         test_cmp important c1.c
  72 '
  73
  74 test_expect_success 'will not overwrite re-added file' '
  75         git reset --hard c1 &&
  76         git rm c1.c &&
  77         git commit -m "rm c1.c" &&
  78         cp important c1.c &&
  79         git add c1.c &&
  80         test_must_fail git merge c1a &&
  81         test_path_is_missing .git/MERGE_HEAD &&
  82         test_cmp important c1.c
  83 '
  84
  85 test_expect_success 'will not overwrite removed file with staged changes' '
  86         git reset --hard c1 &&
  87         git rm c1.c &&
  88         git commit -m "rm c1.c" &&
  89         cp important c1.c &&
  90         git add c1.c &&
  91         rm c1.c &&
  92         test_must_fail git merge c1a &&
  93         test_path_is_missing .git/MERGE_HEAD &&
  94         git checkout c1.c &&
  95         test_cmp important c1.c
  96 '
  97
  98 test_expect_success 'will not overwrite unstaged changes in renamed file' '
  99         git reset --hard c1 &&
 100         git mv c1.c other.c &&
 101         git commit -m rename &&
 102         cp important other.c &&
 103         if test "$GIT_TEST_MERGE_ALGORITHM" = ort
 104         then
 105                 test_must_fail git merge c1a >out 2>err &&
 106                 test_i18ngrep "would be overwritten by merge" err &&
 107                 test_cmp important other.c &&
 108                 test_path_is_missing .git/MERGE_HEAD
 109         else
 110                 test_must_fail git merge c1a >out &&
 111                 test_i18ngrep "Refusing to lose dirty file at other.c" out &&
 112                 test_path_is_file other.c~HEAD &&
 113                 test $(git hash-object other.c~HEAD) = $(git rev-parse c1a:c1.c) &&
 114                 test_cmp important other.c
 115         fi
 116 '
 117
 118 test_expect_success 'will not overwrite untracked subtree' '
 119         git reset --hard c0 &&
 120         rm -rf sub &&
 121         mkdir -p sub/f &&
 122         cp important sub/f/important &&
 123         test_must_fail git merge sub &&
 124         test_path_is_missing .git/MERGE_HEAD &&
 125         test_cmp important sub/f/important
 126 '
 127
 128 cat >expect <<\EOF
 129 error: The following untracked working tree files would be overwritten by merge:
 130         sub
 131         sub2
 132 Please move or remove them before you merge.
 133 Aborting
 134 EOF
 135
 136 test_expect_success 'will not overwrite untracked file in leading path' '
 137         git reset --hard c0 &&
 138         rm -rf sub &&
 139         cp important sub &&
 140         cp important sub2 &&
 141         test_must_fail git merge sub 2>out &&
 142         test_cmp out expect &&
 143         test_path_is_missing .git/MERGE_HEAD &&
 144         test_cmp important sub &&
 145         test_cmp important sub2 &&
 146         rm -f sub sub2
 147 '
 148
 149 test_expect_success SYMLINKS 'will not overwrite untracked symlink in leading path' '
 150         git reset --hard c0 &&
 151         rm -rf sub &&
 152         mkdir sub2 &&
 153         ln -s sub2 sub &&
 154         test_must_fail git merge sub &&
 155         test_path_is_missing .git/MERGE_HEAD
 156 '
 157
 158 test_expect_success 'will not be confused by symlink in leading path' '
 159         git reset --hard c0 &&
 160         rm -rf sub &&
 161         test_ln_s_add sub2 sub &&
 162         git commit -m ln &&
 163         git checkout sub
 164 '
 165
 166 cat >expect <<\EOF
 167 error: Untracked working tree file 'c0.c' would be overwritten by merge.
 168 fatal: read-tree failed
 169 EOF
 170
 171 test_expect_success 'will not overwrite untracked file on unborn branch' '
 172         git reset --hard c0 &&
 173         git rm -fr . &&
 174         git checkout --orphan new &&
 175         cp important c0.c &&
 176         test_must_fail git merge c0 2>out &&
 177         test_cmp out expect
 178 '
 179
 180 test_expect_success 'will not overwrite untracked file on unborn branch .git/MERGE_HEAD sanity etc.' '
 181         test_when_finished "rm c0.c" &&
 182         test_path_is_missing .git/MERGE_HEAD &&
 183         test_cmp important c0.c
 184 '
 185
 186 test_expect_success 'failed merge leaves unborn branch in the womb' '
 187         test_must_fail git rev-parse --verify HEAD
 188 '
 189
 190 test_expect_success 'set up unborn branch and content' '
 191         git symbolic-ref HEAD refs/heads/unborn &&
 192         rm -f .git/index &&
 193         echo foo > tracked-file &&
 194         git add tracked-file &&
 195         echo bar > untracked-file
 196 '
 197
 198 test_expect_success 'will not clobber WT/index when merging into unborn' '
 199         git merge main &&
 200         grep foo tracked-file &&
 201         git show :tracked-file >expect &&
 202         grep foo expect &&
 203         grep bar untracked-file
 204 '
 205
 206 test_done