mirror of
https://github.com/git/git.git
synced 2024-10-30 05:47:53 +01:00
82881b3823
Signed-off-by: Matthew Ogilvie <mmogilvi_git@miniinfo.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
637 lines
15 KiB
C
637 lines
15 KiB
C
#include "cache.h"
|
|
#include "attr.h"
|
|
|
|
const char git_attr__true[] = "(builtin)true";
|
|
const char git_attr__false[] = "\0(builtin)false";
|
|
static const char git_attr__unknown[] = "(builtin)unknown";
|
|
#define ATTR__TRUE git_attr__true
|
|
#define ATTR__FALSE git_attr__false
|
|
#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.
|
|
*/
|
|
#define HASHSIZE 257
|
|
|
|
#ifndef DEBUG_ATTR
|
|
#define DEBUG_ATTR 0
|
|
#endif
|
|
|
|
struct git_attr {
|
|
struct git_attr *next;
|
|
unsigned h;
|
|
int attr_nr;
|
|
char name[FLEX_ARRAY];
|
|
};
|
|
static int attr_nr;
|
|
|
|
static struct git_attr_check *check_all_attr;
|
|
static struct git_attr *(git_attr_hash[HASHSIZE]);
|
|
|
|
static unsigned hash_name(const char *name, int namelen)
|
|
{
|
|
unsigned val = 0;
|
|
unsigned char c;
|
|
|
|
while (namelen--) {
|
|
c = *name++;
|
|
val = ((val << 7) | (val >> 22)) ^ c;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
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"
|
|
*/
|
|
if (*name == '-')
|
|
return -1;
|
|
while (namelen--) {
|
|
char ch = *name++;
|
|
if (! (ch == '-' || ch == '.' || ch == '_' ||
|
|
('0' <= ch && ch <= '9') ||
|
|
('a' <= ch && ch <= 'z') ||
|
|
('A' <= ch && ch <= 'Z')) )
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
struct git_attr *git_attr(const char *name, int len)
|
|
{
|
|
unsigned hval = hash_name(name, len);
|
|
unsigned pos = hval % HASHSIZE;
|
|
struct git_attr *a;
|
|
|
|
for (a = git_attr_hash[pos]; a; a = a->next) {
|
|
if (a->h == hval &&
|
|
!memcmp(a->name, name, len) && !a->name[len])
|
|
return a;
|
|
}
|
|
|
|
if (invalid_attr_name(name, len))
|
|
return NULL;
|
|
|
|
a = xmalloc(sizeof(*a) + len + 1);
|
|
memcpy(a->name, name, len);
|
|
a->name[len] = 0;
|
|
a->h = hval;
|
|
a->next = git_attr_hash[pos];
|
|
a->attr_nr = attr_nr++;
|
|
git_attr_hash[pos] = a;
|
|
|
|
check_all_attr = xrealloc(check_all_attr,
|
|
sizeof(*check_all_attr) * attr_nr);
|
|
check_all_attr[a->attr_nr].attr = a;
|
|
check_all_attr[a->attr_nr].value = ATTR__UNKNOWN;
|
|
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".
|
|
*/
|
|
|
|
/* What does a matched pattern decide? */
|
|
struct attr_state {
|
|
struct git_attr *attr;
|
|
const char *setto;
|
|
};
|
|
|
|
struct match_attr {
|
|
union {
|
|
char *pattern;
|
|
struct git_attr *attr;
|
|
} u;
|
|
char is_macro;
|
|
unsigned num_attr;
|
|
struct attr_state state[FLEX_ARRAY];
|
|
};
|
|
|
|
static const char blank[] = " \t\r\n";
|
|
|
|
static const char *parse_attr(const char *src, int lineno, const char *cp,
|
|
int *num_attr, struct match_attr *res)
|
|
{
|
|
const char *ep, *equals;
|
|
int len;
|
|
|
|
ep = cp + strcspn(cp, blank);
|
|
equals = strchr(cp, '=');
|
|
if (equals && ep < equals)
|
|
equals = NULL;
|
|
if (equals)
|
|
len = equals - cp;
|
|
else
|
|
len = ep - cp;
|
|
if (!res) {
|
|
if (*cp == '-' || *cp == '!') {
|
|
cp++;
|
|
len--;
|
|
}
|
|
if (invalid_attr_name(cp, len)) {
|
|
fprintf(stderr,
|
|
"%.*s is not a valid attribute name: %s:%d\n",
|
|
len, cp, src, lineno);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
struct attr_state *e;
|
|
|
|
e = &(res->state[*num_attr]);
|
|
if (*cp == '-' || *cp == '!') {
|
|
e->setto = (*cp == '-') ? ATTR__FALSE : ATTR__UNSET;
|
|
cp++;
|
|
len--;
|
|
}
|
|
else if (!equals)
|
|
e->setto = ATTR__TRUE;
|
|
else {
|
|
e->setto = xmemdupz(equals + 1, ep - equals - 1);
|
|
}
|
|
e->attr = git_attr(cp, len);
|
|
}
|
|
(*num_attr)++;
|
|
return ep + strspn(ep, blank);
|
|
}
|
|
|
|
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;
|
|
struct match_attr *res = NULL;
|
|
int pass;
|
|
int is_macro;
|
|
|
|
cp = line + strspn(line, blank);
|
|
if (!*cp || *cp == '#')
|
|
return NULL;
|
|
name = cp;
|
|
namelen = strcspn(name, blank);
|
|
if (strlen(ATTRIBUTE_MACRO_PREFIX) < namelen &&
|
|
!prefixcmp(name, ATTRIBUTE_MACRO_PREFIX)) {
|
|
if (!macro_ok) {
|
|
fprintf(stderr, "%s not allowed: %s:%d\n",
|
|
name, src, lineno);
|
|
return NULL;
|
|
}
|
|
is_macro = 1;
|
|
name += strlen(ATTRIBUTE_MACRO_PREFIX);
|
|
name += strspn(name, blank);
|
|
namelen = strcspn(name, blank);
|
|
if (invalid_attr_name(name, namelen)) {
|
|
fprintf(stderr,
|
|
"%.*s is not a valid attribute name: %s:%d\n",
|
|
namelen, name, src, lineno);
|
|
return NULL;
|
|
}
|
|
}
|
|
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;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* Like info/exclude and .gitignore, the attribute information can
|
|
* come from many places.
|
|
*
|
|
* (1) .gitattribute file of the same directory;
|
|
* (2) .gitattribute file of the parent directory if (1) does not have
|
|
* any match; this goes recursively upwards, just like .gitignore.
|
|
* (3) $GIT_DIR/info/attributes, which overrides both of the above.
|
|
*
|
|
* In the same file, later entries override the earlier match, so in the
|
|
* global list, we would have entries from info/attributes the earliest
|
|
* (reading the file from top to bottom), .gitattribute of the root
|
|
* directory (again, reading the file from top to bottom) down to the
|
|
* current directory, and then scan the list backwards to find the first match.
|
|
* This is exactly the same as what excluded() does in dir.c to deal with
|
|
* .gitignore
|
|
*/
|
|
|
|
static struct attr_stack {
|
|
struct attr_stack *prev;
|
|
char *origin;
|
|
unsigned num_matches;
|
|
unsigned alloc;
|
|
struct match_attr **attrs;
|
|
} *attr_stack;
|
|
|
|
static void free_attr_elem(struct attr_stack *e)
|
|
{
|
|
int i;
|
|
free(e->origin);
|
|
for (i = 0; i < e->num_matches; i++) {
|
|
struct match_attr *a = e->attrs[i];
|
|
int j;
|
|
for (j = 0; j < a->num_attr; j++) {
|
|
const char *setto = a->state[j].setto;
|
|
if (setto == ATTR__TRUE ||
|
|
setto == ATTR__FALSE ||
|
|
setto == ATTR__UNSET ||
|
|
setto == ATTR__UNKNOWN)
|
|
;
|
|
else
|
|
free((char*) setto);
|
|
}
|
|
free(a);
|
|
}
|
|
free(e);
|
|
}
|
|
|
|
static const char *builtin_attr[] = {
|
|
"[attr]binary -diff -crlf",
|
|
NULL,
|
|
};
|
|
|
|
static void handle_attr_line(struct attr_stack *res,
|
|
const char *line,
|
|
const char *src,
|
|
int lineno,
|
|
int macro_ok)
|
|
{
|
|
struct match_attr *a;
|
|
|
|
a = parse_attr_line(line, src, lineno, macro_ok);
|
|
if (!a)
|
|
return;
|
|
if (res->alloc <= res->num_matches) {
|
|
res->alloc = alloc_nr(res->num_matches);
|
|
res->attrs = xrealloc(res->attrs,
|
|
sizeof(struct match_attr *) *
|
|
res->alloc);
|
|
}
|
|
res->attrs[res->num_matches++] = a;
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_array(const char **list)
|
|
{
|
|
struct attr_stack *res;
|
|
const char *line;
|
|
int lineno = 0;
|
|
|
|
res = xcalloc(1, sizeof(*res));
|
|
while ((line = *(list++)) != NULL)
|
|
handle_attr_line(res, line, "[builtin]", ++lineno, 1);
|
|
return res;
|
|
}
|
|
|
|
static struct attr_stack *read_attr_from_file(const char *path, int macro_ok)
|
|
{
|
|
FILE *fp = fopen(path, "r");
|
|
struct attr_stack *res;
|
|
char buf[2048];
|
|
int lineno = 0;
|
|
|
|
if (!fp)
|
|
return NULL;
|
|
res = xcalloc(1, sizeof(*res));
|
|
while (fgets(buf, sizeof(buf), fp))
|
|
handle_attr_line(res, buf, path, ++lineno, macro_ok);
|
|
fclose(fp);
|
|
return res;
|
|
}
|
|
|
|
static void *read_index_data(const char *path)
|
|
{
|
|
int pos, len;
|
|
unsigned long sz;
|
|
enum object_type type;
|
|
void *data;
|
|
|
|
len = strlen(path);
|
|
pos = cache_name_pos(path, len);
|
|
if (pos < 0) {
|
|
/*
|
|
* We might be in the middle of a merge, in which
|
|
* case we would read stage #2 (ours).
|
|
*/
|
|
int i;
|
|
for (i = -pos - 1;
|
|
(pos < 0 && i < active_nr &&
|
|
!strcmp(active_cache[i]->name, path));
|
|
i++)
|
|
if (ce_stage(active_cache[i]) == 2)
|
|
pos = i;
|
|
}
|
|
if (pos < 0)
|
|
return NULL;
|
|
data = read_sha1_file(active_cache[pos]->sha1, &type, &sz);
|
|
if (!data || type != OBJ_BLOB) {
|
|
free(data);
|
|
return NULL;
|
|
}
|
|
return data;
|
|
}
|
|
|
|
static struct attr_stack *read_attr(const char *path, int macro_ok)
|
|
{
|
|
struct attr_stack *res;
|
|
char *buf, *sp;
|
|
int lineno = 0;
|
|
|
|
res = read_attr_from_file(path, macro_ok);
|
|
if (res)
|
|
return res;
|
|
|
|
res = xcalloc(1, sizeof(*res));
|
|
|
|
/*
|
|
* There is no checked out .gitattributes file there, but
|
|
* we might have it in the index. We allow operation in a
|
|
* sparsely checked out work tree, so read from it.
|
|
*/
|
|
buf = read_index_data(path);
|
|
if (!buf)
|
|
return res;
|
|
|
|
for (sp = buf; *sp; ) {
|
|
char *ep;
|
|
int more;
|
|
for (ep = sp; *ep && *ep != '\n'; ep++)
|
|
;
|
|
more = (*ep == '\n');
|
|
*ep = '\0';
|
|
handle_attr_line(res, sp, path, ++lineno, macro_ok);
|
|
sp = ep + more;
|
|
}
|
|
free(buf);
|
|
return res;
|
|
}
|
|
|
|
#if DEBUG_ATTR
|
|
static void debug_info(const char *what, struct attr_stack *elem)
|
|
{
|
|
fprintf(stderr, "%s: %s\n", what, elem->origin ? elem->origin : "()");
|
|
}
|
|
static void debug_set(const char *what, const char *match, struct git_attr *attr, const void *v)
|
|
{
|
|
const char *value = v;
|
|
|
|
if (ATTR_TRUE(value))
|
|
value = "set";
|
|
else if (ATTR_FALSE(value))
|
|
value = "unset";
|
|
else if (ATTR_UNSET(value))
|
|
value = "unspecified";
|
|
|
|
fprintf(stderr, "%s: %s => %s (%s)\n",
|
|
what, attr->name, (char *) value, match);
|
|
}
|
|
#define debug_push(a) debug_info("push", (a))
|
|
#define debug_pop(a) debug_info("pop", (a))
|
|
#else
|
|
#define debug_push(a) do { ; } while (0)
|
|
#define debug_pop(a) do { ; } while (0)
|
|
#define debug_set(a,b,c,d) do { ; } while (0)
|
|
#endif
|
|
|
|
static void bootstrap_attr_stack(void)
|
|
{
|
|
if (!attr_stack) {
|
|
struct attr_stack *elem;
|
|
|
|
elem = read_attr_from_array(builtin_attr);
|
|
elem->origin = NULL;
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
|
|
elem = read_attr(GITATTRIBUTES_FILE, 1);
|
|
elem->origin = strdup("");
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
debug_push(elem);
|
|
|
|
elem = read_attr_from_file(git_path(INFOATTRIBUTES_FILE), 1);
|
|
if (!elem)
|
|
elem = xcalloc(1, sizeof(*elem));
|
|
elem->origin = NULL;
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
}
|
|
}
|
|
|
|
static void prepare_attr_stack(const char *path, int dirlen)
|
|
{
|
|
struct attr_stack *elem, *info;
|
|
int len;
|
|
char pathbuf[PATH_MAX];
|
|
|
|
/*
|
|
* At the bottom of the attribute stack is the built-in
|
|
* set of attribute definitions. 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
|
|
* we always keep the contents of $GIT_DIR/info/attributes.
|
|
*
|
|
* When checking, we use entries from near the top of the
|
|
* stack, preferring $GIT_DIR/info/attributes, then
|
|
* .gitattributes in deeper directories to shallower ones,
|
|
* and finally use the built-in set as the default.
|
|
*/
|
|
if (!attr_stack)
|
|
bootstrap_attr_stack();
|
|
|
|
/*
|
|
* Pop the "info" one that is always at the top of the stack.
|
|
*/
|
|
info = attr_stack;
|
|
attr_stack = info->prev;
|
|
|
|
/*
|
|
* Pop the ones from directories that are not the prefix of
|
|
* the path we are checking.
|
|
*/
|
|
while (attr_stack && attr_stack->origin) {
|
|
int namelen = strlen(attr_stack->origin);
|
|
|
|
elem = attr_stack;
|
|
if (namelen <= dirlen &&
|
|
!strncmp(elem->origin, path, namelen))
|
|
break;
|
|
|
|
debug_pop(elem);
|
|
attr_stack = elem->prev;
|
|
free_attr_elem(elem);
|
|
}
|
|
|
|
/*
|
|
* Read from parent directories and push them down
|
|
*/
|
|
while (1) {
|
|
char *cp;
|
|
|
|
len = strlen(attr_stack->origin);
|
|
if (dirlen <= len)
|
|
break;
|
|
memcpy(pathbuf, path, dirlen);
|
|
memcpy(pathbuf + dirlen, "/", 2);
|
|
cp = strchr(pathbuf + len + 1, '/');
|
|
strcpy(cp + 1, GITATTRIBUTES_FILE);
|
|
elem = read_attr(pathbuf, 0);
|
|
*cp = '\0';
|
|
elem->origin = strdup(pathbuf);
|
|
elem->prev = attr_stack;
|
|
attr_stack = elem;
|
|
debug_push(elem);
|
|
}
|
|
|
|
/*
|
|
* Finally push the "info" one at the top of the stack.
|
|
*/
|
|
info->prev = attr_stack;
|
|
attr_stack = info;
|
|
}
|
|
|
|
static int path_matches(const char *pathname, int pathlen,
|
|
const char *pattern,
|
|
const char *base, int baselen)
|
|
{
|
|
if (!strchr(pattern, '/')) {
|
|
/* match basename */
|
|
const char *basename = strrchr(pathname, '/');
|
|
basename = basename ? basename + 1 : pathname;
|
|
return (fnmatch(pattern, basename, 0) == 0);
|
|
}
|
|
/*
|
|
* match with FNM_PATHNAME; the pattern has base implicitly
|
|
* in front of it.
|
|
*/
|
|
if (*pattern == '/')
|
|
pattern++;
|
|
if (pathlen < baselen ||
|
|
(baselen && pathname[baselen] != '/') ||
|
|
strncmp(pathname, base, baselen))
|
|
return 0;
|
|
if (baselen != 0)
|
|
baselen++;
|
|
return fnmatch(pattern, pathname + baselen, FNM_PATHNAME) == 0;
|
|
}
|
|
|
|
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++) {
|
|
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);
|
|
*n = v;
|
|
rem--;
|
|
}
|
|
}
|
|
return rem;
|
|
}
|
|
|
|
static int fill(const char *path, int pathlen, struct attr_stack *stk, int rem)
|
|
{
|
|
int i;
|
|
const char *base = stk->origin ? stk->origin : "";
|
|
|
|
for (i = stk->num_matches - 1; 0 < rem && 0 <= i; i--) {
|
|
struct match_attr *a = stk->attrs[i];
|
|
if (a->is_macro)
|
|
continue;
|
|
if (path_matches(path, pathlen,
|
|
a->u.pattern, base, strlen(base)))
|
|
rem = fill_one("fill", a, rem);
|
|
}
|
|
return rem;
|
|
}
|
|
|
|
static int macroexpand(struct attr_stack *stk, int rem)
|
|
{
|
|
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;
|
|
rem = fill_one("expand", a, rem);
|
|
}
|
|
return rem;
|
|
}
|
|
|
|
int git_checkattr(const char *path, int num, struct git_attr_check *check)
|
|
{
|
|
struct attr_stack *stk;
|
|
const char *cp;
|
|
int dirlen, pathlen, i, rem;
|
|
|
|
bootstrap_attr_stack();
|
|
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);
|
|
|
|
for (i = 0; i < num; i++) {
|
|
const char *value = check_all_attr[check[i].attr->attr_nr].value;
|
|
if (value == ATTR__UNKNOWN)
|
|
value = ATTR__UNSET;
|
|
check[i].value = value;
|
|
}
|
|
|
|
return 0;
|
|
}
|