diff options
Diffstat (limited to 'attr.c')
| -rw-r--r-- | attr.c | 200 |
1 files changed, 168 insertions, 32 deletions
@@ -6,6 +6,8 @@ * an insanely large number of attributes. */ +#define USE_THE_REPOSITORY_VARIABLE + #include "git-compat-util.h" #include "config.h" #include "environment.h" @@ -17,6 +19,7 @@ #include "utf8.h" #include "quote.h" #include "read-cache-ll.h" +#include "refs.h" #include "revision.h" #include "object-store-ll.h" #include "setup.h" @@ -24,6 +27,8 @@ #include "tree-walk.h" #include "object-name.h" +char *git_attr_tree; + const char git_attr__true[] = "(builtin)true"; const char git_attr__false[] = "\0(builtin)false"; static const char git_attr__unknown[] = "(builtin)unknown"; @@ -181,6 +186,15 @@ static void all_attrs_init(struct attr_hashmap *map, struct attr_check *check) } } +/* + * Attribute name cannot begin with "builtin_" which + * is a reserved namespace for built in attributes values. + */ +static int attr_name_reserved(const char *name) +{ + return starts_with(name, "builtin_"); +} + static int attr_name_valid(const char *name, size_t namelen) { /* @@ -313,7 +327,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp, cp++; len--; } - if (!attr_name_valid(cp, len)) { + if (!attr_name_valid(cp, len) || attr_name_reserved(cp)) { report_invalid_attr(cp, len, src, lineno); return NULL; } @@ -377,7 +391,7 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, name += strlen(ATTRIBUTE_MACRO_PREFIX); name += strspn(name, blank); namelen = strcspn(name, blank); - if (!attr_name_valid(name, namelen)) { + if (!attr_name_valid(name, namelen) || attr_name_reserved(name)) { report_invalid_attr(name, namelen, src, lineno); goto fail_return; } @@ -753,8 +767,8 @@ static struct attr_stack *read_attr_from_file(const char *path, unsigned flags) return res; } -static struct attr_stack *read_attr_from_buf(char *buf, const char *path, - unsigned flags) +static struct attr_stack *read_attr_from_buf(char *buf, size_t length, + const char *path, unsigned flags) { struct attr_stack *res; char *sp; @@ -762,6 +776,11 @@ static struct attr_stack *read_attr_from_buf(char *buf, const char *path, if (!buf) return NULL; + if (length >= ATTR_MAX_FILE_SIZE) { + warning(_("ignoring overly large gitattributes blob '%s'"), path); + free(buf); + return NULL; + } CALLOC_ARRAY(res, 1); for (sp = buf; *sp;) { @@ -801,41 +820,57 @@ static struct attr_stack *read_attr_from_blob(struct index_state *istate, return NULL; } - return read_attr_from_buf(buf, path, flags); + return read_attr_from_buf(buf, sz, path, flags); } static struct attr_stack *read_attr_from_index(struct index_state *istate, const char *path, unsigned flags) { + struct attr_stack *stack = NULL; char *buf; unsigned long size; + int sparse_dir_pos = -1; if (!istate) return NULL; /* - * The .gitattributes file only applies to files within its - * parent directory. In the case of cone-mode sparse-checkout, - * the .gitattributes file is sparse if and only if all paths - * within that directory are also sparse. Thus, don't load the - * .gitattributes file since it will not matter. - * - * In the case of a sparse index, it is critical that we don't go - * looking for a .gitattributes file, as doing so would cause the - * index to expand. + * When handling sparse-checkouts, .gitattributes files + * may reside within a sparse directory. We distinguish + * whether a path exists directly in the index or not by + * evaluating if 'pos' is negative. + * If 'pos' is negative, the path is not directly present + * in the index and is likely within a sparse directory. + * For paths not in the index, The absolute value of 'pos' + * minus 1 gives us the position where the path would be + * inserted in lexicographic order within the index. + * We then subtract another 1 from this value + * (sparse_dir_pos = -pos - 2) to find the position of the + * last index entry which is lexicographically smaller than + * the path. This would be the sparse directory containing + * the path. By identifying the sparse directory containing + * the path, we can correctly read the attributes specified + * in the .gitattributes file from the tree object of the + * sparse directory. */ - if (!path_in_cone_mode_sparse_checkout(path, istate)) - return NULL; + if (!path_in_cone_mode_sparse_checkout(path, istate)) { + int pos = index_name_pos_sparse(istate, path, strlen(path)); - buf = read_blob_data_from_index(istate, path, &size); - if (!buf) - return NULL; - if (size >= ATTR_MAX_FILE_SIZE) { - warning(_("ignoring overly large gitattributes blob '%s'"), path); - return NULL; + if (pos < 0) + sparse_dir_pos = -pos - 2; } - return read_attr_from_buf(buf, path, flags); + if (sparse_dir_pos >= 0 && + S_ISSPARSEDIR(istate->cache[sparse_dir_pos]->ce_mode) && + !strncmp(istate->cache[sparse_dir_pos]->name, path, ce_namelen(istate->cache[sparse_dir_pos]))) { + const char *relative_path = path + ce_namelen(istate->cache[sparse_dir_pos]); + stack = read_attr_from_blob(istate, &istate->cache[sparse_dir_pos]->oid, relative_path, flags); + } else { + buf = read_blob_data_from_index(istate, path, &size); + if (buf) + stack = read_attr_from_buf(buf, size, path, flags); + } + return stack; } static struct attr_stack *read_attr(struct index_state *istate, @@ -1179,29 +1214,130 @@ void set_git_attr_source(const char *tree_object_name) default_attr_source_tree_object_name = xstrdup(tree_object_name); } -static void compute_default_attr_source(struct object_id *attr_source) +static int compute_default_attr_source(struct object_id *attr_source) { + int ignore_bad_attr_tree = 0; + if (!default_attr_source_tree_object_name) default_attr_source_tree_object_name = getenv(GIT_ATTR_SOURCE_ENVIRONMENT); - if (!default_attr_source_tree_object_name || !is_null_oid(attr_source)) - return; + if (!default_attr_source_tree_object_name && git_attr_tree) { + default_attr_source_tree_object_name = git_attr_tree; + ignore_bad_attr_tree = 1; + } + + if (!default_attr_source_tree_object_name) + return 0; + + if (!startup_info->have_repository) { + if (!ignore_bad_attr_tree) + die(_("cannot use --attr-source or GIT_ATTR_SOURCE without repo")); + return 0; + } + + if (repo_get_oid_treeish(the_repository, + default_attr_source_tree_object_name, + attr_source)) { + if (!ignore_bad_attr_tree) + die(_("bad --attr-source or GIT_ATTR_SOURCE")); + return 0; + } - if (repo_get_oid_treeish(the_repository, default_attr_source_tree_object_name, attr_source)) - die(_("bad --attr-source or GIT_ATTR_SOURCE")); + return 1; } static struct object_id *default_attr_source(void) { static struct object_id attr_source; + static int has_attr_source = -1; - if (is_null_oid(&attr_source)) - compute_default_attr_source(&attr_source); - if (is_null_oid(&attr_source)) + if (has_attr_source < 0) + has_attr_source = compute_default_attr_source(&attr_source); + if (!has_attr_source) return NULL; return &attr_source; } +static const char *interned_mode_string(unsigned int mode) +{ + static struct { + unsigned int val; + char str[7]; + } mode_string[] = { + { .val = 0040000 }, + { .val = 0100644 }, + { .val = 0100755 }, + { .val = 0120000 }, + { .val = 0160000 }, + }; + int i; + + for (i = 0; i < ARRAY_SIZE(mode_string); i++) { + if (mode_string[i].val != mode) + continue; + if (!*mode_string[i].str) + snprintf(mode_string[i].str, sizeof(mode_string[i].str), + "%06o", mode); + return mode_string[i].str; + } + BUG("Unsupported mode 0%o", mode); +} + +static const char *builtin_object_mode_attr(struct index_state *istate, const char *path) +{ + unsigned int mode; + + if (direction == GIT_ATTR_CHECKIN) { + struct object_id oid; + struct stat st; + if (lstat(path, &st)) + die_errno(_("unable to stat '%s'"), path); + mode = canon_mode(st.st_mode); + if (S_ISDIR(mode)) { + /* + *`path` is either a directory or it is a submodule, + * in which case it is already indexed as submodule + * or it does not exist in the index yet and we need to + * check if we can resolve to a ref. + */ + int pos = index_name_pos(istate, path, strlen(path)); + if (pos >= 0) { + if (S_ISGITLINK(istate->cache[pos]->ce_mode)) + mode = istate->cache[pos]->ce_mode; + } else if (repo_resolve_gitlink_ref(the_repository, path, + "HEAD", &oid) == 0) { + mode = S_IFGITLINK; + } + } + } else { + /* + * For GIT_ATTR_CHECKOUT and GIT_ATTR_INDEX we only check + * for mode in the index. + */ + int pos = index_name_pos(istate, path, strlen(path)); + if (pos >= 0) + mode = istate->cache[pos]->ce_mode; + else + return ATTR__UNSET; + } + + return interned_mode_string(mode); +} + + +static const char *compute_builtin_attr(struct index_state *istate, + const char *path, + const struct git_attr *attr) { + static const struct git_attr *object_mode_attr; + + if (!object_mode_attr) + object_mode_attr = git_attr("builtin_objectmode"); + + if (attr == object_mode_attr) + return builtin_object_mode_attr(istate, path); + return ATTR__UNSET; +} + void git_check_attr(struct index_state *istate, const char *path, struct attr_check *check) @@ -1215,7 +1351,7 @@ void git_check_attr(struct index_state *istate, unsigned int n = check->items[i].attr->attr_nr; const char *value = check->all_attrs[n].value; if (value == ATTR__UNKNOWN) - value = ATTR__UNSET; + value = compute_builtin_attr(istate, path, check->all_attrs[n].attr); check->items[i].value = value; } } |