diff options
Diffstat (limited to 'attr.c')
-rw-r--r-- | attr.c | 302 |
1 files changed, 202 insertions, 100 deletions
@@ -1,6 +1,17 @@ +/* + * Handle git attributes. See gitattributes(5) for a description of + * the file syntax, and Documentation/technical/api-gitattributes.txt + * for a description of the API. + * + * One basic design decision here is that we are not going to support + * an insanely large number of attributes. + */ + #define NO_THE_INDEX_COMPATIBILITY_MACROS #include "cache.h" +#include "exec_cmd.h" #include "attr.h" +#include "dir.h" const char git_attr__true[] = "(builtin)true"; const char git_attr__false[] = "\0(builtin)false"; @@ -10,12 +21,7 @@ static const char git_attr__unknown[] = "(builtin)unknown"; #define ATTR__UNSET NULL #define ATTR__UNKNOWN git_attr__unknown -/* - * The basic design decision here is that we are not going to have - * insanely large number of attributes. - * - * This is a randomly chosen prime. - */ +/* This is a randomly chosen prime. */ #define HASHSIZE 257 #ifndef DEBUG_ATTR @@ -33,6 +39,11 @@ static int attr_nr; static struct git_attr_check *check_all_attr; static struct git_attr *(git_attr_hash[HASHSIZE]); +char *git_attr_name(struct git_attr *attr) +{ + return attr->name; +} + static unsigned hash_name(const char *name, int namelen) { unsigned val = 0, c; @@ -47,12 +58,10 @@ static unsigned hash_name(const char *name, int namelen) static int invalid_attr_name(const char *name, int namelen) { /* - * Attribute name cannot begin with '-' and from - * [-A-Za-z0-9_.]. We'd specifically exclude '=' for now, - * as we might later want to allow non-binary value for - * attributes, e.g. "*.svg merge=special-merge-program-for-svg" + * Attribute name cannot begin with '-' and must consist of + * characters from [-A-Za-z0-9_.]. */ - if (*name == '-') + if (namelen <= 0 || *name == '-') return -1; while (namelen--) { char ch = *name++; @@ -65,7 +74,7 @@ static int invalid_attr_name(const char *name, int namelen) return 0; } -struct git_attr *git_attr(const char *name, int len) +static struct git_attr *git_attr_internal(const char *name, int len) { unsigned hval = hash_name(name, len); unsigned pos = hval % HASHSIZE; @@ -95,15 +104,10 @@ struct git_attr *git_attr(const char *name, int len) return a; } -/* - * .gitattributes file is one line per record, each of which is - * - * (1) glob pattern. - * (2) whitespace - * (3) whitespace separated list of attribute names, each of which - * could be prefixed with '-' to mean "set to false", '!' to mean - * "unset". - */ +struct git_attr *git_attr(const char *name) +{ + return git_attr_internal(name, strlen(name)); +} /* What does a matched pattern decide? */ struct attr_state { @@ -111,6 +115,20 @@ struct attr_state { const char *setto; }; +/* + * One rule, as from a .gitattributes file. + * + * If is_macro is true, then u.attr is a pointer to the git_attr being + * defined. + * + * If is_macro is false, then u.pattern points at the filename pattern + * to which the rule applies. (The memory pointed to is part of the + * memory block allocated for the match_attr instance.) + * + * In either case, num_attr is the number of attributes affected by + * this rule, and state is an array listing them. The attributes are + * listed as they appear in the file (macros unexpanded). + */ struct match_attr { union { char *pattern; @@ -123,8 +141,15 @@ struct match_attr { static const char blank[] = " \t\r\n"; +/* + * Parse a whitespace-delimited attribute state (i.e., "attr", + * "-attr", "!attr", or "attr=value") from the string starting at src. + * If e is not NULL, write the results to *e. Return a pointer to the + * remainder of the string (with leading whitespace removed), or NULL + * if there was an error. + */ static const char *parse_attr(const char *src, int lineno, const char *cp, - int *num_attr, struct match_attr *res) + struct attr_state *e) { const char *ep, *equals; int len; @@ -137,7 +162,7 @@ static const char *parse_attr(const char *src, int lineno, const char *cp, len = equals - cp; else len = ep - cp; - if (!res) { + if (!e) { if (*cp == '-' || *cp == '!') { cp++; len--; @@ -149,9 +174,6 @@ static const char *parse_attr(const char *src, int lineno, const char *cp, return NULL; } } else { - struct attr_state *e; - - e = &(res->state[*num_attr]); if (*cp == '-' || *cp == '!') { e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET; cp++; @@ -162,9 +184,8 @@ static const char *parse_attr(const char *src, int lineno, const char *cp, else { e->setto = xmemdupz(equals + 1, ep - equals - 1); } - e->attr = git_attr(cp, len); + e->attr = git_attr_internal(cp, len); } - (*num_attr)++; return ep + strspn(ep, blank); } @@ -172,10 +193,9 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, int lineno, int macro_ok) { int namelen; - int num_attr; - const char *cp, *name; + int num_attr, i; + const char *cp, *name, *states; struct match_attr *res = NULL; - int pass; int is_macro; cp = line + strspn(line, blank); @@ -204,32 +224,35 @@ static struct match_attr *parse_attr_line(const char *line, const char *src, else is_macro = 0; - for (pass = 0; pass < 2; pass++) { - /* pass 0 counts and allocates, pass 1 fills */ - num_attr = 0; - cp = name + namelen; - cp = cp + strspn(cp, blank); - while (*cp) { - cp = parse_attr(src, lineno, cp, &num_attr, res); - if (!cp) - return NULL; - } - if (pass) - break; - res = xcalloc(1, - sizeof(*res) + - sizeof(struct attr_state) * num_attr + - (is_macro ? 0 : namelen + 1)); - if (is_macro) - res->u.attr = git_attr(name, namelen); - else { - res->u.pattern = (char *)&(res->state[num_attr]); - memcpy(res->u.pattern, name, namelen); - res->u.pattern[namelen] = 0; - } - res->is_macro = is_macro; - res->num_attr = num_attr; + states = name + namelen; + states += strspn(states, blank); + + /* First pass to count the attr_states */ + for (cp = states, num_attr = 0; *cp; num_attr++) { + cp = parse_attr(src, lineno, cp, NULL); + if (!cp) + return NULL; } + + res = xcalloc(1, + sizeof(*res) + + sizeof(struct attr_state) * num_attr + + (is_macro ? 0 : namelen + 1)); + if (is_macro) + res->u.attr = git_attr_internal(name, namelen); + else { + res->u.pattern = (char *)&(res->state[num_attr]); + memcpy(res->u.pattern, name, namelen); + res->u.pattern[namelen] = 0; + } + res->is_macro = is_macro; + res->num_attr = num_attr; + + /* Second pass to fill the attr_states */ + for (cp = states, i = 0; *cp; i++) { + cp = parse_attr(src, lineno, cp, &(res->state[i])); + } + return res; } @@ -282,7 +305,7 @@ static void free_attr_elem(struct attr_stack *e) } static const char *builtin_attr[] = { - "[attr]binary -diff -crlf", + "[attr]binary -diff -text", NULL, }; @@ -457,6 +480,19 @@ static void drop_attr_stack(void) } } +static const char *git_etc_gitattributes(void) +{ + static const char *system_wide; + if (!system_wide) + system_wide = system_path(ETC_GITATTRIBUTES); + return system_wide; +} + +static int git_attr_system(void) +{ + return !git_env_bool("GIT_ATTR_NOSYSTEM", 0); +} + static void bootstrap_attr_stack(void) { if (!attr_stack) { @@ -467,9 +503,27 @@ static void bootstrap_attr_stack(void) elem->prev = attr_stack; attr_stack = elem; + if (git_attr_system()) { + elem = read_attr_from_file(git_etc_gitattributes(), 1); + if (elem) { + elem->origin = NULL; + elem->prev = attr_stack; + attr_stack = elem; + } + } + + if (git_attributes_file) { + elem = read_attr_from_file(git_attributes_file, 1); + if (elem) { + elem->origin = NULL; + elem->prev = attr_stack; + attr_stack = elem; + } + } + if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { elem = read_attr(GITATTRIBUTES_FILE, 1); - elem->origin = strdup(""); + elem->origin = xstrdup(""); elem->prev = attr_stack; attr_stack = elem; debug_push(elem); @@ -484,17 +538,23 @@ static void bootstrap_attr_stack(void) } } -static void prepare_attr_stack(const char *path, int dirlen) +static void prepare_attr_stack(const char *path) { struct attr_stack *elem, *info; - int len; - struct strbuf pathbuf; + int dirlen, len; + const char *cp; - strbuf_init(&pathbuf, dirlen+2+strlen(GITATTRIBUTES_FILE)); + cp = strrchr(path, '/'); + if (!cp) + dirlen = 0; + else + dirlen = cp - path; /* * At the bottom of the attribute stack is the built-in - * set of attribute definitions. Then, contents from + * set of attribute definitions, followed by the contents + * of $(prefix)/etc/gitattributes and a file specified by + * core.attributesfile. Then, contents from * .gitattribute files from directories closer to the * root to the ones in deeper directories are pushed * to the stack. Finally, at the very top of the stack @@ -505,8 +565,7 @@ static void prepare_attr_stack(const char *path, int dirlen) * .gitattributes in deeper directories to shallower ones, * and finally use the built-in set as the default. */ - if (!attr_stack) - bootstrap_attr_stack(); + bootstrap_attr_stack(); /* * Pop the "info" one that is always at the top of the stack. @@ -535,27 +594,28 @@ static void prepare_attr_stack(const char *path, int dirlen) * Read from parent directories and push them down */ if (!is_bare_repository() || direction == GIT_ATTR_INDEX) { - while (1) { - char *cp; + struct strbuf pathbuf = STRBUF_INIT; + while (1) { len = strlen(attr_stack->origin); if (dirlen <= len) break; - strbuf_reset(&pathbuf); - strbuf_add(&pathbuf, path, dirlen); + cp = memchr(path + len + 1, '/', dirlen - len - 1); + if (!cp) + cp = path + dirlen; + strbuf_add(&pathbuf, path, cp - path); strbuf_addch(&pathbuf, '/'); - cp = strchr(pathbuf.buf + len + 1, '/'); - strcpy(cp + 1, GITATTRIBUTES_FILE); + strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE); elem = read_attr(pathbuf.buf, 0); - *cp = '\0'; - elem->origin = strdup(pathbuf.buf); + strbuf_setlen(&pathbuf, cp - path); + elem->origin = strbuf_detach(&pathbuf, NULL); elem->prev = attr_stack; attr_stack = elem; debug_push(elem); } - } - strbuf_release(&pathbuf); + strbuf_release(&pathbuf); + } /* * Finally push the "info" one at the top of the stack. @@ -572,7 +632,7 @@ static int path_matches(const char *pathname, int pathlen, /* match basename */ const char *basename = strrchr(pathname, '/'); basename = basename ? basename + 1 : pathname; - return (fnmatch(pattern, basename, 0) == 0); + return (fnmatch_icase(pattern, basename, 0) == 0); } /* * match with FNM_PATHNAME; the pattern has base implicitly @@ -586,23 +646,28 @@ static int path_matches(const char *pathname, int pathlen, return 0; if (baselen != 0) baselen++; - return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0; + return fnmatch_icase(pattern, pathname + baselen, FNM_PATHNAME) == 0; } +static int macroexpand_one(int attr_nr, int rem); + static int fill_one(const char *what, struct match_attr *a, int rem) { struct git_attr_check *check = check_all_attr; int i; - for (i = 0; 0 < rem && i < a->num_attr; i++) { + for (i = a->num_attr - 1; 0 < rem && 0 <= i; i--) { struct git_attr *attr = a->state[i].attr; const char **n = &(check[attr->attr_nr].value); const char *v = a->state[i].setto; if (*n == ATTR__UNKNOWN) { - debug_set(what, a->u.pattern, attr, v); + debug_set(what, + a->is_macro ? a->u.attr->name : a->u.pattern, + attr, v); *n = v; rem--; + rem = macroexpand_one(attr->attr_nr, rem); } } return rem; @@ -624,45 +689,54 @@ static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem) return rem; } -static int macroexpand(struct attr_stack *stk, int rem) +static int macroexpand_one(int attr_nr, int rem) { + struct attr_stack *stk; + struct match_attr *a = NULL; int i; - struct git_attr_check *check = check_all_attr; - for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) { - struct match_attr *a = stk->attrs[i]; - if (!a->is_macro) - continue; - if (check[a->u.attr->attr_nr].value != ATTR__TRUE) - continue; + if (check_all_attr[attr_nr].value != ATTR__TRUE) + return rem; + + for (stk = attr_stack; !a && stk; stk = stk->prev) + for (i = stk->num_matches - 1; !a && 0 <= i; i--) { + struct match_attr *ma = stk->attrs[i]; + if (!ma->is_macro) + continue; + if (ma->u.attr->attr_nr == attr_nr) + a = ma; + } + + if (a) rem = fill_one("expand", a, rem); - } + return rem; } -int git_checkattr(const char *path, int num, struct git_attr_check *check) +/* + * Collect all attributes for path into the array pointed to by + * check_all_attr. + */ +static void collect_all_attrs(const char *path) { struct attr_stack *stk; - const char *cp; - int dirlen, pathlen, i, rem; + int i, pathlen, rem; - bootstrap_attr_stack(); + prepare_attr_stack(path); for (i = 0; i < attr_nr; i++) check_all_attr[i].value = ATTR__UNKNOWN; pathlen = strlen(path); - cp = strrchr(path, '/'); - if (!cp) - dirlen = 0; - else - dirlen = cp - path; - prepare_attr_stack(path, dirlen); rem = attr_nr; for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) rem = fill(path, pathlen, stk, rem); +} - for (stk = attr_stack; 0 < rem && stk; stk = stk->prev) - rem = macroexpand(stk, rem); +int git_check_attr(const char *path, int num, struct git_attr_check *check) +{ + int i; + + collect_all_attrs(path); for (i = 0; i < num; i++) { const char *value = check_all_attr[check[i].attr->attr_nr].value; @@ -674,6 +748,34 @@ int git_checkattr(const char *path, int num, struct git_attr_check *check) return 0; } +int git_all_attrs(const char *path, int *num, struct git_attr_check **check) +{ + int i, count, j; + + collect_all_attrs(path); + + /* Count the number of attributes that are set. */ + count = 0; + for (i = 0; i < attr_nr; i++) { + const char *value = check_all_attr[i].value; + if (value != ATTR__UNSET && value != ATTR__UNKNOWN) + ++count; + } + *num = count; + *check = xmalloc(sizeof(**check) * count); + j = 0; + for (i = 0; i < attr_nr; i++) { + const char *value = check_all_attr[i].value; + if (value != ATTR__UNSET && value != ATTR__UNKNOWN) { + (*check)[j].attr = check_all_attr[i].attr; + (*check)[j].value = value; + ++j; + } + } + + return 0; +} + void git_attr_set_direction(enum git_attr_direction new, struct index_state *istate) { enum git_attr_direction old = direction; |