tests/index/racy.c

   1 #include "clar_libgit2.h"
   2 #include "../checkout/checkout_helpers.h"
   3
   4 #include "buffer.h"
   5 #include "index.h"
   6 #include "repository.h"
   7
   8 static git_repository *g_repo;
   9
  10 void test_index_racy__initialize(void)
  11 {
  12         cl_git_pass(git_repository_init(&g_repo, "diff_racy", false));
  13 }
  14
  15 void test_index_racy__cleanup(void)
  16 {
  17         git_repository_free(g_repo);
  18         g_repo = NULL;
  19
  20         cl_fixture_cleanup("diff_racy");
  21 }
  22
  23 void test_index_racy__diff(void)
  24 {
  25         git_index *index;
  26         git_diff *diff;
  27         git_buf path = GIT_BUF_INIT;
  28
  29         cl_git_pass(git_buf_joinpath(&path, git_repository_workdir(g_repo), "A"));
  30         cl_git_mkfile(path.ptr, "A");
  31
  32         /* Put 'A' into the index */
  33         cl_git_pass(git_repository_index(&index, g_repo));
  34         cl_git_pass(git_index_add_bypath(index, "A"));
  35         cl_git_pass(git_index_write(index));
  36
  37         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  38         cl_assert_equal_i(0, git_diff_num_deltas(diff));
  39         git_diff_free(diff);
  40
  41         /* Change its contents quickly, so we get the same timestamp */
  42         cl_git_mkfile(path.ptr, "B");
  43
  44         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  45         cl_assert_equal_i(1, git_diff_num_deltas(diff));
  46
  47         git_index_free(index);
  48         git_diff_free(diff);
  49         git_buf_free(&path);
  50 }
  51
  52 void test_index_racy__write_index_just_after_file(void)
  53 {
  54         git_index *index;
  55         git_diff *diff;
  56         git_buf path = GIT_BUF_INIT;
  57         struct timeval times[2];
  58
  59         /* Make sure we do have a timestamp */
  60         cl_git_pass(git_repository_index(&index, g_repo));
  61         cl_git_pass(git_index_write(index));
  62
  63         cl_git_pass(git_buf_joinpath(&path, git_repository_workdir(g_repo), "A"));
  64         cl_git_mkfile(path.ptr, "A");
  65         /* Force the file's timestamp to be a second after we wrote the index */
  66         times[0].tv_sec = index->stamp.mtime + 1;
  67         times[0].tv_usec = 0;
  68         times[1].tv_sec = index->stamp.mtime + 1;
  69         times[1].tv_usec = 0;
  70         cl_git_pass(p_utimes(path.ptr, times));
  71
  72         /*
  73          * Put 'A' into the index, the size field will be filled,
  74          * because the index' on-disk timestamp does not match the
  75          * file's timestamp.
  76          */
  77         cl_git_pass(git_index_add_bypath(index, "A"));
  78         cl_git_pass(git_index_write(index));
  79
  80         cl_git_mkfile(path.ptr, "B");
  81         /*
  82          * Pretend this index' modification happend a second after the
  83          * file update, and rewrite the file in that same second.
  84          */
  85         times[0].tv_sec = index->stamp.mtime + 2;
  86         times[0].tv_usec = 0;
  87         times[1].tv_sec = index->stamp.mtime + 2;
  88         times[0].tv_usec = 0;
  89
  90         cl_git_pass(p_utimes(git_index_path(index), times));
  91         cl_git_pass(p_utimes(path.ptr, times));
  92
  93         cl_git_pass(git_index_read(index, true));
  94
  95         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
  96         cl_assert_equal_i(1, git_diff_num_deltas(diff));
  97
  98         git_buf_free(&path);
  99         git_diff_free(diff);
 100         git_index_free(index);
 101 }
 102
 103 void test_index_racy__empty_file_after_smudge(void)
 104 {
 105         git_index *index;
 106         git_diff *diff;
 107         git_buf path = GIT_BUF_INIT;
 108         int i, found_race = 0;
 109         const git_index_entry *entry;
 110
 111         /* Make sure we do have a timestamp */
 112         cl_git_pass(git_repository_index__weakptr(&index, g_repo));
 113         cl_git_pass(git_index_write(index));
 114
 115         cl_git_pass(git_buf_joinpath(&path, git_repository_workdir(g_repo), "A"));
 116
 117         /* Make sure writing the file, adding and rewriting happen in the same second */
 118         for (i = 0; i < 10; i++) {
 119                 struct stat st;
 120                 cl_git_mkfile(path.ptr, "A");
 121
 122                 cl_git_pass(git_index_add_bypath(index, "A"));
 123                 cl_git_mkfile(path.ptr, "B");
 124                 cl_git_pass(git_index_write(index));
 125
 126                 cl_git_mkfile(path.ptr, "");
 127
 128                 cl_git_pass(p_stat(path.ptr, &st));
 129                 cl_assert(entry = git_index_get_bypath(index, "A", 0));
 130                 if (entry->mtime.seconds == (int32_t) st.st_mtime) {
 131                         found_race = 1;
 132                         break;
 133                 }
 134
 135         }
 136
 137         if (!found_race)
 138                 cl_fail("failed to find race after 10 attempts");
 139
 140         cl_assert_equal_i(0, entry->file_size);
 141
 142         cl_git_pass(git_diff_index_to_workdir(&diff, g_repo, index, NULL));
 143         cl_assert_equal_i(1, git_diff_num_deltas(diff));
 144
 145         git_buf_free(&path);
 146         git_diff_free(diff);
 147 }