mirror of
https://github.com/git/git.git
synced 2025-03-20 12:23:30 +00:00
At the same time, we do not want to allow arbitrary strings for attribute names, as we are likely to want to extend the syntax later. Allow only alnum, dash, underscore and dot for now. Signed-off-by: Junio C Hamano <junkio@cox.net>
506 lines
12 KiB
C
506 lines
12 KiB
C
#include "cache.h"
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#include "attr.h"
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/*
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* The basic design decision here is that we are not going to have
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* insanely large number of attributes.
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*
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* This is a randomly chosen prime.
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*/
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#define HASHSIZE 257
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#ifndef DEBUG_ATTR
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#define DEBUG_ATTR 0
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#endif
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struct git_attr {
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struct git_attr *next;
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unsigned h;
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int attr_nr;
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char name[FLEX_ARRAY];
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};
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static int attr_nr;
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static struct git_attr_check *check_all_attr;
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static struct git_attr *(git_attr_hash[HASHSIZE]);
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static unsigned hash_name(const char *name, int namelen)
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{
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unsigned val = 0;
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unsigned char c;
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while (namelen--) {
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c = *name++;
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val = ((val << 7) | (val >> 22)) ^ c;
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}
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return val;
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}
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static int invalid_attr_name(const char *name, int namelen)
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{
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/*
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* Attribute name cannot begin with '-' and from
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* [-A-Za-z0-9_.]. We'd specifically exclude '=' for now,
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* as we might later want to allow non-binary value for
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* attributes, e.g. "*.svg merge=special-merge-program-for-svg"
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*/
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if (*name == '-')
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return -1;
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while (namelen--) {
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char ch = *name++;
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if (! (ch == '-' || ch == '.' || ch == '_' ||
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('0' <= ch && ch <= '9') ||
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('a' <= ch && ch <= 'z') ||
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('A' <= ch && ch <= 'Z')) )
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return -1;
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}
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return 0;
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}
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struct git_attr *git_attr(const char *name, int len)
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{
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unsigned hval = hash_name(name, len);
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unsigned pos = hval % HASHSIZE;
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struct git_attr *a;
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for (a = git_attr_hash[pos]; a; a = a->next) {
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if (a->h == hval &&
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!memcmp(a->name, name, len) && !a->name[len])
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return a;
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}
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if (invalid_attr_name(name, len))
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return NULL;
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a = xmalloc(sizeof(*a) + len + 1);
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memcpy(a->name, name, len);
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a->name[len] = 0;
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a->h = hval;
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a->next = git_attr_hash[pos];
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a->attr_nr = attr_nr++;
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git_attr_hash[pos] = a;
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check_all_attr = xrealloc(check_all_attr,
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sizeof(*check_all_attr) * attr_nr);
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check_all_attr[a->attr_nr].attr = a;
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return a;
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}
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/*
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* .gitattributes file is one line per record, each of which is
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*
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* (1) glob pattern.
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* (2) whitespace
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* (3) whitespace separated list of attribute names, each of which
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* could be prefixed with '-' to mean "not set".
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*/
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struct attr_state {
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int unset;
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struct git_attr *attr;
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};
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struct match_attr {
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union {
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char *pattern;
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struct git_attr *attr;
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} u;
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char is_macro;
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unsigned num_attr;
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struct attr_state state[FLEX_ARRAY];
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};
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static const char blank[] = " \t\r\n";
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static struct match_attr *parse_attr_line(const char *line, const char *src,
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int lineno, int macro_ok)
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{
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int namelen;
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int num_attr;
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const char *cp, *name;
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struct match_attr *res = res;
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int pass;
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int is_macro;
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cp = line + strspn(line, blank);
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if (!*cp || *cp == '#')
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return NULL;
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name = cp;
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namelen = strcspn(name, blank);
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if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
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!prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
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if (!macro_ok) {
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fprintf(stderr, "%s not allowed: %s:%d\n",
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name, src, lineno);
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return NULL;
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}
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is_macro = 1;
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name += strlen(ATTRIBUTE_MACRO_PREFIX);
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name += strspn(name, blank);
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namelen = strcspn(name, blank);
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if (invalid_attr_name(name, namelen)) {
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fprintf(stderr,
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"%.*s is not a valid attribute name: %s:%d\n",
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namelen, name, src, lineno);
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return NULL;
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}
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}
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else
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is_macro = 0;
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for (pass = 0; pass < 2; pass++) {
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/* pass 0 counts and allocates, pass 1 fills */
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num_attr = 0;
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cp = name + namelen;
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cp = cp + strspn(cp, blank);
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while (*cp) {
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const char *ep;
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ep = cp + strcspn(cp, blank);
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if (!pass) {
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if (*cp == '-')
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cp++;
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if (invalid_attr_name(cp, ep - cp)) {
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fprintf(stderr,
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"%.*s is not a valid attribute name: %s:%d\n",
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(int)(ep - cp), cp,
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src, lineno);
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return NULL;
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}
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} else {
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struct attr_state *e;
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e = &(res->state[num_attr]);
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if (*cp == '-') {
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e->unset = 1;
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cp++;
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}
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e->attr = git_attr(cp, ep - cp);
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}
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num_attr++;
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cp = ep + strspn(ep, blank);
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}
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if (pass)
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break;
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res = xcalloc(1,
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sizeof(*res) +
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sizeof(struct attr_state) * num_attr +
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(is_macro ? 0 : namelen + 1));
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if (is_macro) {
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res->u.attr = git_attr(name, namelen);
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}
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else {
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res->u.pattern = (char*)&(res->state[num_attr]);
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memcpy(res->u.pattern, name, namelen);
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res->u.pattern[namelen] = 0;
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}
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res->is_macro = is_macro;
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res->num_attr = num_attr;
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}
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return res;
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}
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/*
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* Like info/exclude and .gitignore, the attribute information can
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* come from many places.
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*
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* (1) .gitattribute file of the same directory;
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* (2) .gitattribute file of the parent directory if (1) does not have any match;
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* this goes recursively upwards, just like .gitignore
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* (3) perhaps $GIT_DIR/info/attributes, as the final fallback.
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*
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* In the same file, later entries override the earlier match, so in the
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* global list, we would have entries from info/attributes the earliest
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* (reading the file from top to bottom), .gitattribute of the root
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* directory (again, reading the file from top to bottom) down to the
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* current directory, and then scan the list backwards to find the first match.
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* This is exactly the same as what excluded() does in dir.c to deal with
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* .gitignore
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*/
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static struct attr_stack {
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struct attr_stack *prev;
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char *origin;
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unsigned num_matches;
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struct match_attr **attrs;
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} *attr_stack;
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static void free_attr_elem(struct attr_stack *e)
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{
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int i;
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free(e->origin);
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for (i = 0; i < e->num_matches; i++)
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free(e->attrs[i]);
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free(e);
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}
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static const char *builtin_attr[] = {
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"[attr]binary -diff -crlf",
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NULL,
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};
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static struct attr_stack *read_attr_from_array(const char **list)
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{
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struct attr_stack *res;
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const char *line;
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int lineno = 0;
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res = xcalloc(1, sizeof(*res));
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while ((line = *(list++)) != NULL) {
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struct match_attr *a;
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a = parse_attr_line(line, "[builtin]", ++lineno, 1);
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if (!a)
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continue;
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res->attrs = xrealloc(res->attrs, res->num_matches + 1);
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res->attrs[res->num_matches++] = a;
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}
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return res;
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}
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static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
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{
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FILE *fp;
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struct attr_stack *res;
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char buf[2048];
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int lineno = 0;
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res = xcalloc(1, sizeof(*res));
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fp = fopen(path, "r");
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if (!fp)
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return res;
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while (fgets(buf, sizeof(buf), fp)) {
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struct match_attr *a;
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a = parse_attr_line(buf, path, ++lineno, macro_ok);
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if (!a)
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continue;
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res->attrs = xrealloc(res->attrs, res->num_matches + 1);
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res->attrs[res->num_matches++] = a;
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}
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fclose(fp);
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return res;
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}
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#if DEBUG_ATTR
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static void debug_info(const char *what, struct attr_stack *elem)
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{
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fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
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}
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static void debug_set(const char *what, const char *match, struct git_attr *attr, int set)
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{
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fprintf(stderr, "%s: %s => %d (%s)\n",
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what, attr->name, set, match);
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}
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#define debug_push(a) debug_info("push", (a))
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#define debug_pop(a) debug_info("pop", (a))
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#else
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#define debug_push(a) do { ; } while (0)
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#define debug_pop(a) do { ; } while (0)
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#define debug_set(a,b,c,d) do { ; } while (0)
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#endif
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static void bootstrap_attr_stack(void)
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{
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if (!attr_stack) {
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struct attr_stack *elem;
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elem = read_attr_from_array(builtin_attr);
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elem->origin = NULL;
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elem->prev = attr_stack;
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attr_stack = elem;
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elem = read_attr_from_file(GITATTRIBUTES_FILE, 1);
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elem->origin = strdup("");
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elem->prev = attr_stack;
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attr_stack = elem;
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debug_push(elem);
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elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
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elem->origin = NULL;
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elem->prev = attr_stack;
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attr_stack = elem;
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}
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}
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static void prepare_attr_stack(const char *path, int dirlen)
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{
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struct attr_stack *elem, *info;
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int len;
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char pathbuf[PATH_MAX];
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/*
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* At the bottom of the attribute stack is the built-in
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* set of attribute definitions. Then, contents from
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* .gitattribute files from directories closer to the
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* root to the ones in deeper directories are pushed
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* to the stack. Finally, at the very top of the stack
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* we always keep the contents of $GIT_DIR/info/attributes.
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*
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* When checking, we use entries from near the top of the
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* stack, preferring $GIT_DIR/info/attributes, then
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* .gitattributes in deeper directories to shallower ones,
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* and finally use the built-in set as the default.
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*/
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if (!attr_stack)
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bootstrap_attr_stack();
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/*
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* Pop the "info" one that is always at the top of the stack.
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*/
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info = attr_stack;
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attr_stack = info->prev;
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/*
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* Pop the ones from directories that are not the prefix of
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* the path we are checking.
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*/
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while (attr_stack && attr_stack->origin) {
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int namelen = strlen(attr_stack->origin);
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elem = attr_stack;
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if (namelen <= dirlen &&
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!strncmp(elem->origin, path, namelen))
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break;
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debug_pop(elem);
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attr_stack = elem->prev;
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free_attr_elem(elem);
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}
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/*
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* Read from parent directories and push them down
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*/
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while (1) {
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char *cp;
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len = strlen(attr_stack->origin);
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if (dirlen <= len)
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break;
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memcpy(pathbuf, path, dirlen);
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memcpy(pathbuf + dirlen, "/", 2);
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cp = strchr(pathbuf + len + 1, '/');
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strcpy(cp + 1, GITATTRIBUTES_FILE);
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elem = read_attr_from_file(pathbuf, 0);
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*cp = '\0';
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elem->origin = strdup(pathbuf);
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elem->prev = attr_stack;
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attr_stack = elem;
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debug_push(elem);
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}
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/*
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* Finally push the "info" one at the top of the stack.
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*/
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info->prev = attr_stack;
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attr_stack = info;
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}
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static int path_matches(const char *pathname, int pathlen,
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const char *pattern,
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const char *base, int baselen)
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{
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if (!strchr(pattern, '/')) {
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/* match basename */
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const char *basename = strrchr(pathname, '/');
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basename = basename ? basename + 1 : pathname;
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return (fnmatch(pattern, basename, 0) == 0);
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}
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/*
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* match with FNM_PATHNAME; the pattern has base implicitly
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* in front of it.
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*/
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if (*pattern == '/')
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pattern++;
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if (pathlen < baselen ||
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(baselen && pathname[baselen - 1] != '/') ||
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strncmp(pathname, base, baselen))
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return 0;
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return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
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}
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static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
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{
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const char *base = stk->origin ? stk->origin : "";
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int i, j;
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struct git_attr_check *check = check_all_attr;
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for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
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struct match_attr *a = stk->attrs[i];
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if (a->is_macro)
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continue;
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if (path_matches(path, pathlen,
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a->u.pattern, base, strlen(base))) {
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for (j = 0; 0 < rem && j < a->num_attr; j++) {
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struct git_attr *attr = a->state[j].attr;
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int set = !a->state[j].unset;
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int *n = &(check[attr->attr_nr].isset);
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if (*n < 0) {
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debug_set("fill", a->u.pattern, attr, set);
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*n = set;
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rem--;
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}
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}
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}
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}
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return rem;
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}
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static int macroexpand(struct attr_stack *stk, int rem)
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{
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int i, j;
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struct git_attr_check *check = check_all_attr;
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for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
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struct match_attr *a = stk->attrs[i];
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if (!a->is_macro)
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continue;
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if (check[a->u.attr->attr_nr].isset < 0)
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continue;
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for (j = 0; 0 < rem && j < a->num_attr; j++) {
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struct git_attr *attr = a->state[j].attr;
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int set = !a->state[j].unset;
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int *n = &(check[attr->attr_nr].isset);
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if (*n < 0) {
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debug_set("expand", a->u.attr->name, attr, set);
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*n = set;
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rem--;
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}
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}
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}
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return rem;
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}
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int git_checkattr(const char *path, int num, struct git_attr_check *check)
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{
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struct attr_stack *stk;
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const char *cp;
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int dirlen, pathlen, i, rem;
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bootstrap_attr_stack();
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for (i = 0; i < attr_nr; i++)
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check_all_attr[i].isset = -1;
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pathlen = strlen(path);
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cp = strrchr(path, '/');
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if (!cp)
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dirlen = 0;
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else
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dirlen = cp - path;
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prepare_attr_stack(path, dirlen);
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rem = attr_nr;
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for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
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rem = fill(path, pathlen, stk, rem);
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for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
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rem = macroexpand(stk, rem);
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for (i = 0; i < num; i++)
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check[i].isset = check_all_attr[check[i].attr->attr_nr].isset;
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return 0;
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}
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