Revision 3adab6f3a7793253b22a4a7aae34221d19e0236a authored by Junio C Hamano on 09 February 2012, 21:30:52 UTC, committed by Junio C Hamano on 09 February 2012, 21:30:52 UTC
When the user explicitly asked us not to, don't launch an editor. But do everything else the same way as the "edit" case, i.e. leave the comment with verification result in the log template and record the mergesig in the resulting merge commit for later inspection. Based on initiail analysis by Jonathan Nieder. Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent b5c9f1c
attr.c
/*
* 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";
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
/* 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]);
char *git_attr_name(struct git_attr *attr)
{
return attr->name;
}
static unsigned hash_name(const char *name, int namelen)
{
unsigned val = 0, 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 must consist of
* characters from [-A-Za-z0-9_.].
*/
if (namelen <= 0 || *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;
}
static struct git_attr *git_attr_internal(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;
}
struct git_attr *git_attr(const char *name)
{
return git_attr_internal(name, strlen(name));
}
/* What does a matched pattern decide? */
struct attr_state {
struct git_attr *attr;
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;
struct git_attr *attr;
} u;
char is_macro;
unsigned num_attr;
struct attr_state state[FLEX_ARRAY];
};
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,
struct attr_state *e)
{
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 (!e) {
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 {
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_internal(cp, len);
}
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, i;
const char *cp, *name, *states;
struct match_attr *res = NULL;
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;
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;
}
/*
* 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->attrs);
free(e);
}
static const char *builtin_attr[] = {
"[attr]binary -diff -text",
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 enum git_attr_direction direction;
static struct index_state *use_index;
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;
struct index_state *istate = use_index ? use_index : &the_index;
len = strlen(path);
pos = index_name_pos(istate, 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 < istate->cache_nr &&
!strcmp(istate->cache[i]->name, path));
i++)
if (ce_stage(istate->cache[i]) == 2)
pos = i;
}
if (pos < 0)
return NULL;
data = read_sha1_file(istate->cache[pos]->sha1, &type, &sz);
if (!data || type != OBJ_BLOB) {
free(data);
return NULL;
}
return data;
}
static struct attr_stack *read_attr_from_index(const char *path, int macro_ok)
{
struct attr_stack *res;
char *buf, *sp;
int lineno = 0;
buf = read_index_data(path);
if (!buf)
return NULL;
res = xcalloc(1, sizeof(*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;
}
static struct attr_stack *read_attr(const char *path, int macro_ok)
{
struct attr_stack *res;
if (direction == GIT_ATTR_CHECKOUT) {
res = read_attr_from_index(path, macro_ok);
if (!res)
res = read_attr_from_file(path, macro_ok);
}
else if (direction == GIT_ATTR_CHECKIN) {
res = read_attr_from_file(path, macro_ok);
if (!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.
*/
res = read_attr_from_index(path, macro_ok);
}
else
res = read_attr_from_index(path, macro_ok);
if (!res)
res = xcalloc(1, sizeof(*res));
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 drop_attr_stack(void)
{
while (attr_stack) {
struct attr_stack *elem = attr_stack;
attr_stack = elem->prev;
free_attr_elem(elem);
}
}
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)
{
struct attr_stack *elem;
if (attr_stack)
return;
elem = read_attr_from_array(builtin_attr);
elem->origin = NULL;
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 = xstrdup("");
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)
{
struct attr_stack *elem, *info;
int dirlen, len;
const char *cp;
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, 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
* 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.
*/
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. Break out of the loop when we see
* the root one (whose origin is an empty string "") or the builtin
* one (whose origin is NULL) without popping it.
*/
while (attr_stack->origin) {
int namelen = strlen(attr_stack->origin);
elem = attr_stack;
if (namelen <= dirlen &&
!strncmp(elem->origin, path, namelen) &&
(!namelen || path[namelen] == '/'))
break;
debug_pop(elem);
attr_stack = elem->prev;
free_attr_elem(elem);
}
/*
* Read from parent directories and push them down
*/
if (!is_bare_repository() || direction == GIT_ATTR_INDEX) {
/*
* bootstrap_attr_stack() should have added, and the
* above loop should have stopped before popping, the
* root element whose attr_stack->origin is set to an
* empty string.
*/
struct strbuf pathbuf = STRBUF_INIT;
assert(attr_stack->origin);
while (1) {
len = strlen(attr_stack->origin);
if (dirlen <= len)
break;
cp = memchr(path + len + 1, '/', dirlen - len - 1);
if (!cp)
cp = path + dirlen;
strbuf_add(&pathbuf, path, cp - path);
strbuf_addch(&pathbuf, '/');
strbuf_addstr(&pathbuf, GITATTRIBUTES_FILE);
elem = read_attr(pathbuf.buf, 0);
strbuf_setlen(&pathbuf, cp - path);
elem->origin = strbuf_detach(&pathbuf, NULL);
elem->prev = attr_stack;
attr_stack = elem;
debug_push(elem);
}
strbuf_release(&pathbuf);
}
/*
* 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_icase(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_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 = 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->is_macro ? a->u.attr->name : a->u.pattern,
attr, v);
*n = v;
rem--;
rem = macroexpand_one(attr->attr_nr, 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_one(int attr_nr, int rem)
{
struct attr_stack *stk;
struct match_attr *a = NULL;
int i;
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;
}
/*
* 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;
int i, pathlen, rem;
prepare_attr_stack(path);
for (i = 0; i < attr_nr; i++)
check_all_attr[i].value = ATTR__UNKNOWN;
pathlen = strlen(path);
rem = attr_nr;
for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)
rem = fill(path, pathlen, 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;
if (value == ATTR__UNKNOWN)
value = ATTR__UNSET;
check[i].value = value;
}
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;
if (is_bare_repository() && new != GIT_ATTR_INDEX)
die("BUG: non-INDEX attr direction in a bare repo");
direction = new;
if (new != old)
drop_attr_stack();
use_index = istate;
}
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