src/test/test-copy.c

   1 /***
   2   This file is part of systemd
   3
   4   Copyright 2014 Ronny Chevalier
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <unistd.h>
  21
  22 #include "alloc-util.h"
  23 #include "copy.h"
  24 #include "fd-util.h"
  25 #include "fileio.h"
  26 #include "fs-util.h"
  27 #include "log.h"
  28 #include "macro.h"
  29 #include "mkdir.h"
  30 #include "path-util.h"
  31 #include "rm-rf.h"
  32 #include "string-util.h"
  33 #include "strv.h"
  34 #include "user-util.h"
  35 #include "util.h"
  36
  37 static void test_copy_file(void) {
  38         _cleanup_free_ char *buf = NULL;
  39         char fn[] = "/tmp/test-copy_file.XXXXXX";
  40         char fn_copy[] = "/tmp/test-copy_file.XXXXXX";
  41         size_t sz = 0;
  42         int fd;
  43
  44         log_info("%s", __func__);
  45
  46         fd = mkostemp_safe(fn);
  47         assert_se(fd >= 0);
  48         close(fd);
  49
  50         fd = mkostemp_safe(fn_copy);
  51         assert_se(fd >= 0);
  52         close(fd);
  53
  54         assert_se(write_string_file(fn, "foo bar bar bar foo", WRITE_STRING_FILE_CREATE) == 0);
  55
  56         assert_se(copy_file(fn, fn_copy, 0, 0644, 0, COPY_REFLINK) == 0);
  57
  58         assert_se(read_full_file(fn_copy, &buf, &sz) == 0);
  59         assert_se(streq(buf, "foo bar bar bar foo\n"));
  60         assert_se(sz == 20);
  61
  62         unlink(fn);
  63         unlink(fn_copy);
  64 }
  65
  66 static void test_copy_file_fd(void) {
  67         char in_fn[] = "/tmp/test-copy-file-fd-XXXXXX";
  68         char out_fn[] = "/tmp/test-copy-file-fd-XXXXXX";
  69         _cleanup_close_ int in_fd = -1, out_fd = -1;
  70         char text[] = "boohoo\nfoo\n\tbar\n";
  71         char buf[64] = {0};
  72
  73         log_info("%s", __func__);
  74
  75         in_fd = mkostemp_safe(in_fn);
  76         assert_se(in_fd >= 0);
  77         out_fd = mkostemp_safe(out_fn);
  78         assert_se(out_fd >= 0);
  79
  80         assert_se(write_string_file(in_fn, text, WRITE_STRING_FILE_CREATE) == 0);
  81         assert_se(copy_file_fd("/a/file/which/does/not/exist/i/guess", out_fd, COPY_REFLINK) < 0);
  82         assert_se(copy_file_fd(in_fn, out_fd, COPY_REFLINK) >= 0);
  83         assert_se(lseek(out_fd, SEEK_SET, 0) == 0);
  84
  85         assert_se(read(out_fd, buf, sizeof(buf)) == sizeof(text) - 1);
  86         assert_se(streq(buf, text));
  87
  88         unlink(in_fn);
  89         unlink(out_fn);
  90 }
  91
  92 static void test_copy_tree(void) {
  93         char original_dir[] = "/tmp/test-copy_tree/";
  94         char copy_dir[] = "/tmp/test-copy_tree-copy/";
  95         char **files = STRV_MAKE("file", "dir1/file", "dir1/dir2/file", "dir1/dir2/dir3/dir4/dir5/file");
  96         char **links = STRV_MAKE("link", "file",
  97                                  "link2", "dir1/file");
  98         char **p, **link;
  99         const char *unixsockp;
 100         struct stat st;
 101
 102         log_info("%s", __func__);
 103
 104         (void) rm_rf(copy_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 105         (void) rm_rf(original_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 106
 107         STRV_FOREACH(p, files) {
 108                 _cleanup_free_ char *f;
 109
 110                 assert_se((f = strappend(original_dir, *p)));
 111
 112                 assert_se(mkdir_parents(f, 0755) >= 0);
 113                 assert_se(write_string_file(f, "file", WRITE_STRING_FILE_CREATE) == 0);
 114         }
 115
 116         STRV_FOREACH_PAIR(link, p, links) {
 117                 _cleanup_free_ char *f, *l;
 118
 119                 assert_se((f = strappend(original_dir, *p)));
 120                 assert_se((l = strappend(original_dir, *link)));
 121
 122                 assert_se(mkdir_parents(l, 0755) >= 0);
 123                 assert_se(symlink(f, l) == 0);
 124         }
 125
 126         unixsockp = strjoina(original_dir, "unixsock");
 127         assert_se(mknod(unixsockp, S_IFSOCK|0644, 0) >= 0);
 128
 129         assert_se(copy_tree(original_dir, copy_dir, UID_INVALID, GID_INVALID, COPY_REFLINK|COPY_MERGE) == 0);
 130
 131         STRV_FOREACH(p, files) {
 132                 _cleanup_free_ char *buf = NULL, *f;
 133                 size_t sz = 0;
 134
 135                 assert_se((f = strappend(copy_dir, *p)));
 136
 137                 assert_se(access(f, F_OK) == 0);
 138                 assert_se(read_full_file(f, &buf, &sz) == 0);
 139                 assert_se(streq(buf, "file\n"));
 140         }
 141
 142         STRV_FOREACH_PAIR(link, p, links) {
 143                 _cleanup_free_ char *target = NULL, *f, *l;
 144
 145                 assert_se((f = strjoin(original_dir, *p)));
 146                 assert_se((l = strjoin(copy_dir, *link)));
 147
 148                 assert_se(readlink_and_canonicalize(l, NULL, &target) == 0);
 149                 assert_se(path_equal(f, target));
 150         }
 151
 152         unixsockp = strjoina(copy_dir, "unixsock");
 153         assert_se(stat(unixsockp, &st) >= 0);
 154         assert_se(S_ISSOCK(st.st_mode));
 155
 156         assert_se(copy_tree(original_dir, copy_dir, UID_INVALID, GID_INVALID, COPY_REFLINK) < 0);
 157         assert_se(copy_tree("/tmp/inexistent/foo/bar/fsdoi", copy_dir, UID_INVALID, GID_INVALID, COPY_REFLINK) < 0);
 158
 159         (void) rm_rf(copy_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 160         (void) rm_rf(original_dir, REMOVE_ROOT|REMOVE_PHYSICAL);
 161 }
 162
 163 static void test_copy_bytes(void) {
 164         _cleanup_close_pair_ int pipefd[2] = {-1, -1};
 165         _cleanup_close_ int infd = -1;
 166         int r, r2;
 167         char buf[1024], buf2[1024];
 168
 169         infd = open("/usr/lib/os-release", O_RDONLY|O_CLOEXEC);
 170         if (infd < 0)
 171                 infd = open("/etc/os-release", O_RDONLY|O_CLOEXEC);
 172         assert_se(infd >= 0);
 173
 174         assert_se(pipe2(pipefd, O_CLOEXEC) == 0);
 175
 176         r = copy_bytes(infd, pipefd[1], (uint64_t) -1, 0);
 177         assert_se(r == 0);
 178
 179         r = read(pipefd[0], buf, sizeof(buf));
 180         assert_se(r >= 0);
 181
 182         assert_se(lseek(infd, 0, SEEK_SET) == 0);
 183         r2 = read(infd, buf2, sizeof(buf2));
 184         assert_se(r == r2);
 185
 186         assert_se(strneq(buf, buf2, r));
 187
 188         /* test copy_bytes with invalid descriptors */
 189         r = copy_bytes(pipefd[0], pipefd[0], 1, 0);
 190         assert_se(r == -EBADF);
 191
 192         r = copy_bytes(pipefd[1], pipefd[1], 1, 0);
 193         assert_se(r == -EBADF);
 194
 195         r = copy_bytes(pipefd[1], infd, 1, 0);
 196         assert_se(r == -EBADF);
 197 }
 198
 199 static void test_copy_bytes_regular_file(const char *src, bool try_reflink, uint64_t max_bytes) {
 200         char fn2[] = "/tmp/test-copy-file-XXXXXX";
 201         char fn3[] = "/tmp/test-copy-file-XXXXXX";
 202         _cleanup_close_ int fd = -1, fd2 = -1, fd3 = -1;
 203         int r;
 204         struct stat buf, buf2, buf3;
 205
 206         log_info("%s try_reflink=%s max_bytes=%" PRIu64, __func__, yes_no(try_reflink), max_bytes);
 207
 208         fd = open(src, O_RDONLY | O_CLOEXEC | O_NOCTTY);
 209         assert_se(fd >= 0);
 210
 211         fd2 = mkostemp_safe(fn2);
 212         assert_se(fd2 >= 0);
 213
 214         fd3 = mkostemp_safe(fn3);
 215         assert_se(fd3 >= 0);
 216
 217         r = copy_bytes(fd, fd2, max_bytes, try_reflink ? COPY_REFLINK : 0);
 218         if (max_bytes == (uint64_t) -1)
 219                 assert_se(r == 0);
 220         else
 221                 assert_se(IN_SET(r, 0, 1));
 222
 223         assert_se(lseek(fd2, 0, SEEK_SET) == 0);
 224
 225         r = copy_bytes(fd2, fd3, max_bytes, try_reflink ? COPY_REFLINK : 0);
 226         if (max_bytes == (uint64_t) -1)
 227                 assert_se(r == 0);
 228         else
 229                 /* We cannot distinguish between the input being exactly max_bytes
 230                  * or longer than max_bytes (without trying to read one more byte,
 231                  * or calling stat, or FION_READ, etc, and we don't want to do any
 232                  * of that). So we expect "truncation" since we know that file we
 233                  * are copying is exactly max_bytes bytes. */
 234                 assert_se(r == 1);
 235
 236         assert_se(fstat(fd, &buf) == 0);
 237         assert_se(fstat(fd2, &buf2) == 0);
 238         assert_se(fstat(fd3, &buf3) == 0);
 239
 240         assert_se((uint64_t) buf2.st_size == MIN((uint64_t) buf.st_size, max_bytes));
 241         assert_se(buf3.st_size == buf2.st_size);
 242
 243         unlink(fn2);
 244         unlink(fn3);
 245 }
 246
 247 int main(int argc, char *argv[]) {
 248         test_copy_file();
 249         test_copy_file_fd();
 250         test_copy_tree();
 251         test_copy_bytes();
 252         test_copy_bytes_regular_file(argv[0], false, (uint64_t) -1);
 253         test_copy_bytes_regular_file(argv[0], true, (uint64_t) -1);
 254         test_copy_bytes_regular_file(argv[0], false, 1000); /* smaller than copy buffer size */
 255         test_copy_bytes_regular_file(argv[0], true, 1000);
 256         test_copy_bytes_regular_file(argv[0], false, 32000); /* larger than copy buffer size */
 257         test_copy_bytes_regular_file(argv[0], true, 32000);
 258
 259         return 0;
 260 }