| /* |
| * "diff --no-index" support |
| * Copyright (c) 2007 by Johannes Schindelin |
| * Copyright (c) 2008 by Junio C Hamano |
| */ |
| |
| #include "git-compat-util.h" |
| #include "abspath.h" |
| #include "color.h" |
| #include "commit.h" |
| #include "blob.h" |
| #include "tag.h" |
| #include "diff.h" |
| #include "diffcore.h" |
| #include "gettext.h" |
| #include "revision.h" |
| #include "log-tree.h" |
| #include "parse-options.h" |
| #include "string-list.h" |
| #include "dir.h" |
| |
| static int read_directory_contents(const char *path, struct string_list *list) |
| { |
| DIR *dir; |
| struct dirent *e; |
| |
| if (!(dir = opendir(path))) |
| return error("Could not open directory %s", path); |
| |
| while ((e = readdir_skip_dot_and_dotdot(dir))) |
| string_list_insert(list, e->d_name); |
| |
| closedir(dir); |
| return 0; |
| } |
| |
| /* |
| * This should be "(standard input)" or something, but it will |
| * probably expose many more breakages in the way no-index code |
| * is bolted onto the diff callchain. |
| */ |
| static const char file_from_standard_input[] = "-"; |
| |
| /* |
| * For paths given on the command-line we treat "-" as stdin and named |
| * pipes and symbolic links to named pipes specially. |
| */ |
| enum special { |
| SPECIAL_NONE, |
| SPECIAL_STDIN, |
| SPECIAL_PIPE, |
| }; |
| |
| static int get_mode(const char *path, int *mode, enum special *special) |
| { |
| struct stat st; |
| |
| if (!path || !strcmp(path, "/dev/null")) { |
| *mode = 0; |
| #ifdef GIT_WINDOWS_NATIVE |
| } else if (!strcasecmp(path, "nul")) { |
| *mode = 0; |
| #endif |
| } else if (path == file_from_standard_input) { |
| *mode = create_ce_mode(0666); |
| *special = SPECIAL_STDIN; |
| } else if (lstat(path, &st)) { |
| return error("Could not access '%s'", path); |
| } else { |
| *mode = st.st_mode; |
| } |
| /* |
| * For paths on the command-line treat named pipes and symbolic |
| * links that resolve to a named pipe specially. |
| */ |
| if (special && |
| (S_ISFIFO(*mode) || |
| (S_ISLNK(*mode) && !stat(path, &st) && S_ISFIFO(st.st_mode)))) { |
| *mode = create_ce_mode(0666); |
| *special = SPECIAL_PIPE; |
| } |
| |
| return 0; |
| } |
| |
| static void populate_common(struct diff_filespec *s, struct strbuf *buf) |
| { |
| size_t size = 0; |
| |
| s->should_munmap = 0; |
| s->data = strbuf_detach(buf, &size); |
| s->size = size; |
| s->should_free = 1; |
| s->is_stdin = 1; |
| } |
| |
| static void populate_from_pipe(struct diff_filespec *s) |
| { |
| struct strbuf buf = STRBUF_INIT; |
| int fd = xopen(s->path, O_RDONLY); |
| |
| if (strbuf_read(&buf, fd, 0) < 0) |
| die_errno("error while reading from '%s'", s->path); |
| close(fd); |
| populate_common(s, &buf); |
| } |
| |
| static void populate_from_stdin(struct diff_filespec *s) |
| { |
| struct strbuf buf = STRBUF_INIT; |
| |
| if (strbuf_read(&buf, 0, 0) < 0) |
| die_errno("error while reading from stdin"); |
| populate_common(s, &buf); |
| } |
| |
| static struct diff_filespec *noindex_filespec(const char *name, int mode, |
| enum special special) |
| { |
| struct diff_filespec *s; |
| |
| if (!name) |
| name = "/dev/null"; |
| s = alloc_filespec(name); |
| fill_filespec(s, null_oid(), 0, mode); |
| if (special == SPECIAL_STDIN) |
| populate_from_stdin(s); |
| else if (special == SPECIAL_PIPE) |
| populate_from_pipe(s); |
| return s; |
| } |
| |
| static int queue_diff(struct diff_options *o, |
| const char *name1, const char *name2, int recursing) |
| { |
| int mode1 = 0, mode2 = 0; |
| enum special special1 = SPECIAL_NONE, special2 = SPECIAL_NONE; |
| |
| /* Paths can only be special if we're not recursing. */ |
| if (get_mode(name1, &mode1, recursing ? NULL : &special1) || |
| get_mode(name2, &mode2, recursing ? NULL : &special2)) |
| return -1; |
| |
| if (mode1 && mode2 && S_ISDIR(mode1) != S_ISDIR(mode2)) { |
| struct diff_filespec *d1, *d2; |
| |
| if (S_ISDIR(mode1)) { |
| /* 2 is file that is created */ |
| d1 = noindex_filespec(NULL, 0, SPECIAL_NONE); |
| d2 = noindex_filespec(name2, mode2, special2); |
| name2 = NULL; |
| mode2 = 0; |
| } else { |
| /* 1 is file that is deleted */ |
| d1 = noindex_filespec(name1, mode1, special1); |
| d2 = noindex_filespec(NULL, 0, SPECIAL_NONE); |
| name1 = NULL; |
| mode1 = 0; |
| } |
| /* emit that file */ |
| diff_queue(&diff_queued_diff, d1, d2); |
| |
| /* and then let the entire directory be created or deleted */ |
| } |
| |
| if (S_ISDIR(mode1) || S_ISDIR(mode2)) { |
| struct strbuf buffer1 = STRBUF_INIT; |
| struct strbuf buffer2 = STRBUF_INIT; |
| struct string_list p1 = STRING_LIST_INIT_DUP; |
| struct string_list p2 = STRING_LIST_INIT_DUP; |
| int i1, i2, ret = 0; |
| size_t len1 = 0, len2 = 0; |
| |
| if (name1 && read_directory_contents(name1, &p1)) |
| return -1; |
| if (name2 && read_directory_contents(name2, &p2)) { |
| string_list_clear(&p1, 0); |
| return -1; |
| } |
| |
| if (name1) { |
| strbuf_addstr(&buffer1, name1); |
| strbuf_complete(&buffer1, '/'); |
| len1 = buffer1.len; |
| } |
| |
| if (name2) { |
| strbuf_addstr(&buffer2, name2); |
| strbuf_complete(&buffer2, '/'); |
| len2 = buffer2.len; |
| } |
| |
| for (i1 = i2 = 0; !ret && (i1 < p1.nr || i2 < p2.nr); ) { |
| const char *n1, *n2; |
| int comp; |
| |
| strbuf_setlen(&buffer1, len1); |
| strbuf_setlen(&buffer2, len2); |
| |
| if (i1 == p1.nr) |
| comp = 1; |
| else if (i2 == p2.nr) |
| comp = -1; |
| else |
| comp = strcmp(p1.items[i1].string, p2.items[i2].string); |
| |
| if (comp > 0) |
| n1 = NULL; |
| else { |
| strbuf_addstr(&buffer1, p1.items[i1++].string); |
| n1 = buffer1.buf; |
| } |
| |
| if (comp < 0) |
| n2 = NULL; |
| else { |
| strbuf_addstr(&buffer2, p2.items[i2++].string); |
| n2 = buffer2.buf; |
| } |
| |
| ret = queue_diff(o, n1, n2, 1); |
| } |
| string_list_clear(&p1, 0); |
| string_list_clear(&p2, 0); |
| strbuf_release(&buffer1); |
| strbuf_release(&buffer2); |
| |
| return ret; |
| } else { |
| struct diff_filespec *d1, *d2; |
| |
| if (o->flags.reverse_diff) { |
| SWAP(mode1, mode2); |
| SWAP(name1, name2); |
| SWAP(special1, special2); |
| } |
| |
| d1 = noindex_filespec(name1, mode1, special1); |
| d2 = noindex_filespec(name2, mode2, special2); |
| diff_queue(&diff_queued_diff, d1, d2); |
| return 0; |
| } |
| } |
| |
| /* append basename of F to D */ |
| static void append_basename(struct strbuf *path, const char *dir, const char *file) |
| { |
| const char *tail = strrchr(file, '/'); |
| |
| strbuf_addstr(path, dir); |
| while (path->len && path->buf[path->len - 1] == '/') |
| path->len--; |
| strbuf_addch(path, '/'); |
| strbuf_addstr(path, tail ? tail + 1 : file); |
| } |
| |
| /* |
| * DWIM "diff D F" into "diff D/F F" and "diff F D" into "diff F D/F" |
| * Note that we append the basename of F to D/, so "diff a/b/file D" |
| * becomes "diff a/b/file D/file", not "diff a/b/file D/a/b/file". |
| */ |
| static void fixup_paths(const char **path, struct strbuf *replacement) |
| { |
| struct stat st; |
| unsigned int isdir0 = 0, isdir1 = 0; |
| unsigned int ispipe0 = 0, ispipe1 = 0; |
| |
| if (path[0] != file_from_standard_input && !stat(path[0], &st)) { |
| isdir0 = S_ISDIR(st.st_mode); |
| ispipe0 = S_ISFIFO(st.st_mode); |
| } |
| |
| if (path[1] != file_from_standard_input && !stat(path[1], &st)) { |
| isdir1 = S_ISDIR(st.st_mode); |
| ispipe1 = S_ISFIFO(st.st_mode); |
| } |
| |
| if ((path[0] == file_from_standard_input && isdir1) || |
| (isdir0 && path[1] == file_from_standard_input)) |
| die(_("cannot compare stdin to a directory")); |
| |
| if ((isdir0 && ispipe1) || (ispipe0 && isdir1)) |
| die(_("cannot compare a named pipe to a directory")); |
| |
| if (isdir0 == isdir1) |
| return; |
| if (isdir0) { |
| append_basename(replacement, path[0], path[1]); |
| path[0] = replacement->buf; |
| } else { |
| append_basename(replacement, path[1], path[0]); |
| path[1] = replacement->buf; |
| } |
| } |
| |
| static const char * const diff_no_index_usage[] = { |
| N_("git diff --no-index [<options>] <path> <path>"), |
| NULL |
| }; |
| |
| int diff_no_index(struct rev_info *revs, |
| int implicit_no_index, |
| int argc, const char **argv) |
| { |
| int i, no_index; |
| int ret = 1; |
| const char *paths[2]; |
| char *to_free[ARRAY_SIZE(paths)] = { 0 }; |
| struct strbuf replacement = STRBUF_INIT; |
| const char *prefix = revs->prefix; |
| struct option no_index_options[] = { |
| OPT_BOOL_F(0, "no-index", &no_index, "", |
| PARSE_OPT_NONEG | PARSE_OPT_HIDDEN), |
| OPT_END(), |
| }; |
| struct option *options; |
| |
| options = add_diff_options(no_index_options, &revs->diffopt); |
| argc = parse_options(argc, argv, revs->prefix, options, |
| diff_no_index_usage, 0); |
| if (argc != 2) { |
| if (implicit_no_index) |
| warning(_("Not a git repository. Use --no-index to " |
| "compare two paths outside a working tree")); |
| usage_with_options(diff_no_index_usage, options); |
| } |
| FREE_AND_NULL(options); |
| for (i = 0; i < 2; i++) { |
| const char *p = argv[i]; |
| if (!strcmp(p, "-")) |
| /* |
| * stdin should be spelled as "-"; if you have |
| * path that is "-", spell it as "./-". |
| */ |
| p = file_from_standard_input; |
| else if (prefix) |
| p = to_free[i] = prefix_filename(prefix, p); |
| paths[i] = p; |
| } |
| |
| fixup_paths(paths, &replacement); |
| |
| revs->diffopt.skip_stat_unmatch = 1; |
| if (!revs->diffopt.output_format) |
| revs->diffopt.output_format = DIFF_FORMAT_PATCH; |
| |
| revs->diffopt.flags.no_index = 1; |
| |
| revs->diffopt.flags.relative_name = 1; |
| revs->diffopt.prefix = prefix; |
| |
| revs->max_count = -2; |
| diff_setup_done(&revs->diffopt); |
| |
| setup_diff_pager(&revs->diffopt); |
| revs->diffopt.flags.exit_with_status = 1; |
| |
| if (queue_diff(&revs->diffopt, paths[0], paths[1], 0)) |
| goto out; |
| diff_set_mnemonic_prefix(&revs->diffopt, "1/", "2/"); |
| diffcore_std(&revs->diffopt); |
| diff_flush(&revs->diffopt); |
| |
| /* |
| * The return code for --no-index imitates diff(1): |
| * 0 = no changes, 1 = changes, else error |
| */ |
| ret = diff_result_code(&revs->diffopt); |
| |
| out: |
| for (i = 0; i < ARRAY_SIZE(to_free); i++) |
| free(to_free[i]); |
| strbuf_release(&replacement); |
| return ret; |
| } |