diff options
| -rw-r--r-- | cache.h | 14 | ||||
| -rw-r--r-- | copy.c | 58 | ||||
| -rw-r--r-- | t/helper/test-path-utils.c | 10 | ||||
| -rwxr-xr-x | t/t0060-path-utils.sh | 41 |
4 files changed, 123 insertions, 0 deletions
@@ -1785,6 +1785,20 @@ int copy_fd(int ifd, int ofd); int copy_file(const char *dst, const char *src, int mode); int copy_file_with_time(const char *dst, const char *src, int mode); +/* + * Compare the file mode and contents of two given files. + * + * If both files are actually symbolic links, the function returns 1 if the link + * targets are identical or 0 if they are not. + * + * If any of the two files cannot be accessed or in case of read failures, this + * function returns 0. + * + * If the file modes and contents are identical, the function returns 1, + * otherwise it returns 0. + */ +int do_files_match(const char *path1, const char *path2); + void write_or_die(int fd, const void *buf, size_t count); void fsync_or_die(int fd, const char *); int fsync_component(enum fsync_component component, int fd); @@ -65,3 +65,61 @@ int copy_file_with_time(const char *dst, const char *src, int mode) return copy_times(dst, src); return status; } + +static int do_symlinks_match(const char *path1, const char *path2) +{ + struct strbuf buf1 = STRBUF_INIT, buf2 = STRBUF_INIT; + int ret = 0; + + if (!strbuf_readlink(&buf1, path1, 0) && + !strbuf_readlink(&buf2, path2, 0)) + ret = !strcmp(buf1.buf, buf2.buf); + + strbuf_release(&buf1); + strbuf_release(&buf2); + return ret; +} + +int do_files_match(const char *path1, const char *path2) +{ + struct stat st1, st2; + int fd1 = -1, fd2 = -1, ret = 1; + char buf1[8192], buf2[8192]; + + if ((fd1 = open_nofollow(path1, O_RDONLY)) < 0 || + fstat(fd1, &st1) || !S_ISREG(st1.st_mode)) { + if (fd1 < 0 && errno == ELOOP) + /* maybe this is a symbolic link? */ + return do_symlinks_match(path1, path2); + ret = 0; + } else if ((fd2 = open_nofollow(path2, O_RDONLY)) < 0 || + fstat(fd2, &st2) || !S_ISREG(st2.st_mode)) { + ret = 0; + } + + if (ret) + /* to match, neither must be executable, or both */ + ret = !(st1.st_mode & 0111) == !(st2.st_mode & 0111); + + if (ret) + ret = st1.st_size == st2.st_size; + + while (ret) { + ssize_t len1 = read_in_full(fd1, buf1, sizeof(buf1)); + ssize_t len2 = read_in_full(fd2, buf2, sizeof(buf2)); + + if (len1 < 0 || len2 < 0 || len1 != len2) + ret = 0; /* read error or different file size */ + else if (!len1) /* len2 is also 0; hit EOF on both */ + break; /* ret is still true */ + else + ret = !memcmp(buf1, buf2, len1); + } + + if (fd1 >= 0) + close(fd1); + if (fd2 >= 0) + close(fd2); + + return ret; +} diff --git a/t/helper/test-path-utils.c b/t/helper/test-path-utils.c index f69709d674..0e0de21807 100644 --- a/t/helper/test-path-utils.c +++ b/t/helper/test-path-utils.c @@ -495,6 +495,16 @@ int cmd__path_utils(int argc, const char **argv) return !!res; } + if (argc == 4 && !strcmp(argv[1], "do_files_match")) { + int ret = do_files_match(argv[2], argv[3]); + + if (ret) + printf("equal\n"); + else + printf("different\n"); + return !ret; + } + fprintf(stderr, "%s: unknown function name: %s\n", argv[0], argv[1] ? argv[1] : "(there was none)"); return 1; diff --git a/t/t0060-path-utils.sh b/t/t0060-path-utils.sh index 68e29c904a..73d0e1a7f1 100755 --- a/t/t0060-path-utils.sh +++ b/t/t0060-path-utils.sh @@ -560,4 +560,45 @@ test_expect_success !VALGRIND,RUNTIME_PREFIX,CAN_EXEC_IN_PWD '%(prefix)/ works' test_cmp expect actual ' +test_expect_success 'do_files_match()' ' + test_seq 0 10 >0-10.txt && + test_seq -1 10 >-1-10.txt && + test_seq 1 10 >1-10.txt && + test_seq 1 9 >1-9.txt && + test_seq 0 8 >0-8.txt && + + test-tool path-utils do_files_match 0-10.txt 0-10.txt >out && + + assert_fails() { + test_must_fail \ + test-tool path-utils do_files_match "$1" "$2" >out && + grep different out + } && + + assert_fails 0-8.txt 1-9.txt && + assert_fails -1-10.txt 0-10.txt && + assert_fails 1-10.txt 1-9.txt && + assert_fails 1-10.txt .git && + assert_fails does-not-exist 1-10.txt && + + if test_have_prereq FILEMODE + then + cp 0-10.txt 0-10.x && + chmod a+x 0-10.x && + assert_fails 0-10.txt 0-10.x + fi && + + if test_have_prereq SYMLINKS + then + ln -sf 0-10.txt symlink && + ln -s 0-10.txt another-symlink && + ln -s over-the-ocean yet-another-symlink && + ln -s "$PWD/0-10.txt" absolute-symlink && + assert_fails 0-10.txt symlink && + test-tool path-utils do_files_match symlink another-symlink && + assert_fails symlink yet-another-symlink && + assert_fails symlink absolute-symlink + fi +' + test_done |