pretend-git/attr.c at master · submitgit/pretend-git · GitHub

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* 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;

int maybe_macro;

int maybe_real;

char name[FLEX_ARRAY];

};

static int attr_nr;

static int cannot_trust_maybe_real;

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++;

a->maybe_macro = 0;

a->maybe_real = 0;

git_attr_hash[pos] = a;

REALLOC_ARRAY(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;

};

struct pattern {

const char *pattern;

int patternlen;

int nowildcardlen;

int flags; /* EXC_FLAG_* */

};

* 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 {

struct pattern pat;

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 &&

starts_with(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);

res->u.attr->maybe_macro = 1;

} else {

char *p = (char *)&(res->state[num_attr]);

memcpy(p, name, namelen);

res->u.pat.pattern = p;

parse_exclude_pattern(&res->u.pat.pattern,

&res->u.pat.patternlen,

&res->u.pat.flags,

&res->u.pat.nowildcardlen);

if (res->u.pat.flags & EXC_FLAG_NEGATIVE) {

warning(_("Negative patterns are ignored in git attributes\n"

"Use '\\!' for literal leading exclamation."));

return NULL;

}

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]));

if (!is_macro)

res->state[i].attr->maybe_real = 1;

if (res->state[i].attr->maybe_macro)

cannot_trust_maybe_real = 1;

}

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 is_excluded() does in dir.c to deal with

* .gitignore

static struct attr_stack {

struct attr_stack *prev;

char *origin;

size_t originlen;

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 -merge -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;

ALLOC_GROW(res->attrs, res->num_matches + 1, 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) {

if (errno != ENOENT && errno != ENOTDIR)

warn_on_inaccessible(path);

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 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_blob_data_from_index(use_index ? use_index : &the_index, path, NULL);

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;

char *xdg_attributes_file;

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) {

home_config_paths(NULL, &xdg_attributes_file, "attributes");

git_attributes_file = xdg_attributes_file;

}

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->originlen = 0;

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;

const char *cp;

* 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, &elem->originlen);

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,

int basename_offset,

const struct pattern *pat,

const char *base, int baselen)

{

const char *pattern = pat->pattern;

int prefix = pat->nowildcardlen;

int isdir = (pathlen && pathname[pathlen - 1] == '/');

if ((pat->flags & EXC_FLAG_MUSTBEDIR) && !isdir)

return 0;

if (pat->flags & EXC_FLAG_NODIR) {

return match_basename(pathname + basename_offset,

pathlen - basename_offset - isdir,

pattern, prefix,

pat->patternlen, pat->flags);

}

return match_pathname(pathname, pathlen - isdir,

base, baselen,

pattern, prefix, pat->patternlen, pat->flags);

}

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.pat.pattern,

attr, v);

*n = v;

rem--;

rem = macroexpand_one(attr->attr_nr, rem);

}

return rem;

}

static int fill(const char *path, int pathlen, int basename_offset,

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, basename_offset,

&a->u.pat, base, stk->originlen))

rem = fill_one("fill", a, rem);

}

return rem;

}

static int macroexpand_one(int nr, int rem)

{

struct attr_stack *stk;

struct match_attr *a = NULL;

int i;

if (check_all_attr[nr].value != ATTR__TRUE ||

!check_all_attr[nr].attr->maybe_macro)

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 == nr)

a = ma;

}

if (a)

rem = fill_one("expand", a, rem);

return rem;

}

* Collect attributes for path into the array pointed to by

* check_all_attr. If num is non-zero, only attributes in check[] are

* collected. Otherwise all attributes are collected.

static void collect_some_attrs(const char *path, int num,

struct git_attr_check *check)

{

struct attr_stack *stk;

int i, pathlen, rem, dirlen;

const char *cp, *last_slash = NULL;

int basename_offset;

for (cp = path; *cp; cp++) {

if (*cp == '/' && cp[1])

last_slash = cp;

}

pathlen = cp - path;

if (last_slash) {

basename_offset = last_slash + 1 - path;

dirlen = last_slash - path;

} else {

basename_offset = 0;

dirlen = 0;

}

prepare_attr_stack(path, dirlen);

for (i = 0; i < attr_nr; i++)

check_all_attr[i].value = ATTR__UNKNOWN;

if (num && !cannot_trust_maybe_real) {

rem = 0;

for (i = 0; i < num; i++) {

if (!check[i].attr->maybe_real) {

struct git_attr_check *c;

c = check_all_attr + check[i].attr->attr_nr;

c->value = ATTR__UNSET;

rem++;

}

if (rem == num)

return;

}

rem = attr_nr;

for (stk = attr_stack; 0 < rem && stk; stk = stk->prev)

rem = fill(path, pathlen, basename_offset, stk, rem);

}

int git_check_attr(const char *path, int num, struct git_attr_check *check)

{

int i;

collect_some_attrs(path, num, check);

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_some_attrs(path, 0, NULL);

/* 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;

}

pretend-git/attr.c at master · submitgit/pretend-git · GitHub

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