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#include "cache.h"
#include "config.h"
#include "tag.h"
#include "commit.h"
#include "tree.h"
#include "blob.h"
#include "tree-walk.h"
#include "refs.h"
#include "remote.h"
#include "dir.h"
#include "sha1-array.h"
#include "packfile.h"
static int get_oid_oneline(const char *, struct object_id *, struct commit_list *);
typedef int (*disambiguate_hint_fn)(const struct object_id *, void *);
struct disambiguate_state {
int len; /* length of prefix in hex chars */
char hex_pfx[GIT_MAX_HEXSZ + 1];
struct object_id bin_pfx;
disambiguate_hint_fn fn;
void *cb_data;
struct object_id candidate;
unsigned candidate_exists:1;
unsigned candidate_checked:1;
unsigned candidate_ok:1;
unsigned disambiguate_fn_used:1;
unsigned ambiguous:1;
unsigned always_call_fn:1;
};
static void update_candidates(struct disambiguate_state *ds, const struct object_id *current)
{
if (ds->always_call_fn) {
ds->ambiguous = ds->fn(current, ds->cb_data) ? 1 : 0;
return;
}
if (!ds->candidate_exists) {
/* this is the first candidate */
oidcpy(&ds->candidate, current);
ds->candidate_exists = 1;
return;
} else if (!oidcmp(&ds->candidate, current)) {
/* the same as what we already have seen */
return;
}
if (!ds->fn) {
/* cannot disambiguate between ds->candidate and current */
ds->ambiguous = 1;
return;
}
if (!ds->candidate_checked) {
ds->candidate_ok = ds->fn(&ds->candidate, ds->cb_data);
ds->disambiguate_fn_used = 1;
ds->candidate_checked = 1;
}
if (!ds->candidate_ok) {
/* discard the candidate; we know it does not satisfy fn */
oidcpy(&ds->candidate, current);
ds->candidate_checked = 0;
return;
}
/* if we reach this point, we know ds->candidate satisfies fn */
if (ds->fn(current, ds->cb_data)) {
/*
* if both current and candidate satisfy fn, we cannot
* disambiguate.
*/
ds->candidate_ok = 0;
ds->ambiguous = 1;
}
/* otherwise, current can be discarded and candidate is still good */
}
static int append_loose_object(const struct object_id *oid, const char *path,
void *data)
{
oid_array_append(data, oid);
return 0;
}
static int match_sha(unsigned, const unsigned char *, const unsigned char *);
static void find_short_object_filename(struct disambiguate_state *ds)
{
int subdir_nr = ds->bin_pfx.hash[0];
struct alternate_object_database *alt;
static struct alternate_object_database *fakeent;
if (!fakeent) {
/*
* Create a "fake" alternate object database that
* points to our own object database, to make it
* easier to get a temporary working space in
* alt->name/alt->base while iterating over the
* object databases including our own.
*/
fakeent = alloc_alt_odb(get_object_directory());
}
fakeent->next = alt_odb_list;
for (alt = fakeent; alt && !ds->ambiguous; alt = alt->next) {
int pos;
if (!alt->loose_objects_subdir_seen[subdir_nr]) {
struct strbuf *buf = alt_scratch_buf(alt);
for_each_file_in_obj_subdir(subdir_nr, buf,
append_loose_object,
NULL, NULL,
&alt->loose_objects_cache);
alt->loose_objects_subdir_seen[subdir_nr] = 1;
}
pos = oid_array_lookup(&alt->loose_objects_cache, &ds->bin_pfx);
if (pos < 0)
pos = -1 - pos;
while (!ds->ambiguous && pos < alt->loose_objects_cache.nr) {
const struct object_id *oid;
oid = alt->loose_objects_cache.oid + pos;
if (!match_sha(ds->len, ds->bin_pfx.hash, oid->hash))
break;
update_candidates(ds, oid);
pos++;
}
}
}
static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
{
do {
if (*a != *b)
return 0;
a++;
b++;
len -= 2;
} while (len > 1);
if (len)
if ((*a ^ *b) & 0xf0)
return 0;
return 1;
}
static void unique_in_pack(struct packed_git *p,
struct disambiguate_state *ds)
{
uint32_t num, last, i, first = 0;
const struct object_id *current = NULL;
if (open_pack_index(p) || !p->num_objects)
return;
num = p->num_objects;
last = num;
while (first < last) {
uint32_t mid = first + (last - first) / 2;
const unsigned char *current;
int cmp;
current = nth_packed_object_sha1(p, mid);
cmp = hashcmp(ds->bin_pfx.hash, current);
if (!cmp) {
first = mid;
break;
}
if (cmp > 0) {
first = mid+1;
continue;
}
last = mid;
}
/*
* At this point, "first" is the location of the lowest object
* with an object name that could match "bin_pfx". See if we have
* 0, 1 or more objects that actually match(es).
*/
for (i = first; i < num && !ds->ambiguous; i++) {
struct object_id oid;
current = nth_packed_object_oid(&oid, p, i);
if (!match_sha(ds->len, ds->bin_pfx.hash, current->hash))
break;
update_candidates(ds, current);
}
}
static void find_short_packed_object(struct disambiguate_state *ds)
{
struct packed_git *p;
prepare_packed_git();
for (p = packed_git; p && !ds->ambiguous; p = p->next)
unique_in_pack(p, ds);
}
#define SHORT_NAME_NOT_FOUND (-1)
#define SHORT_NAME_AMBIGUOUS (-2)
static int finish_object_disambiguation(struct disambiguate_state *ds,
struct object_id *oid)
{
if (ds->ambiguous)
return SHORT_NAME_AMBIGUOUS;
if (!ds->candidate_exists)
return SHORT_NAME_NOT_FOUND;
if (!ds->candidate_checked)
/*
* If this is the only candidate, there is no point
* calling the disambiguation hint callback.
*
* On the other hand, if the current candidate
* replaced an earlier candidate that did _not_ pass
* the disambiguation hint callback, then we do have
* more than one objects that match the short name
* given, so we should make sure this one matches;
* otherwise, if we discovered this one and the one
* that we previously discarded in the reverse order,
* we would end up showing different results in the
* same repository!
*/
ds->candidate_ok = (!ds->disambiguate_fn_used ||
ds->fn(&ds->candidate, ds->cb_data));
if (!ds->candidate_ok)
return SHORT_NAME_AMBIGUOUS;
oidcpy(oid, &ds->candidate);
return 0;
}
static int disambiguate_commit_only(const struct object_id *oid, void *cb_data_unused)
{
int kind = sha1_object_info(oid->hash, NULL);
return kind == OBJ_COMMIT;
}
static int disambiguate_committish_only(const struct object_id *oid, void *cb_data_unused)
{
struct object *obj;
int kind;
kind = sha1_object_info(oid->hash, NULL);
if (kind == OBJ_COMMIT)
return 1;
if (kind != OBJ_TAG)
return 0;
/* We need to do this the hard way... */
obj = deref_tag(parse_object(oid), NULL, 0);
if (obj && obj->type == OBJ_COMMIT)
return 1;
return 0;
}
static int disambiguate_tree_only(const struct object_id *oid, void *cb_data_unused)
{
int kind = sha1_object_info(oid->hash, NULL);
return kind == OBJ_TREE;
}
static int disambiguate_treeish_only(const struct object_id *oid, void *cb_data_unused)
{
struct object *obj;
int kind;
kind = sha1_object_info(oid->hash, NULL);
if (kind == OBJ_TREE || kind == OBJ_COMMIT)
return 1;
if (kind != OBJ_TAG)
return 0;
/* We need to do this the hard way... */
obj = deref_tag(parse_object(oid), NULL, 0);
if (obj && (obj->type == OBJ_TREE || obj->type == OBJ_COMMIT))
return 1;
return 0;
}
static int disambiguate_blob_only(const struct object_id *oid, void *cb_data_unused)
{
int kind = sha1_object_info(oid->hash, NULL);
return kind == OBJ_BLOB;
}
static disambiguate_hint_fn default_disambiguate_hint;
int set_disambiguate_hint_config(const char *var, const char *value)
{
static const struct {
const char *name;
disambiguate_hint_fn fn;
} hints[] = {
{ "none", NULL },
{ "commit", disambiguate_commit_only },
{ "committish", disambiguate_committish_only },
{ "tree", disambiguate_tree_only },
{ "treeish", disambiguate_treeish_only },
{ "blob", disambiguate_blob_only }
};
int i;
if (!value)
return config_error_nonbool(var);
for (i = 0; i < ARRAY_SIZE(hints); i++) {
if (!strcasecmp(value, hints[i].name)) {
default_disambiguate_hint = hints[i].fn;
return 0;
}
}
return error("unknown hint type for '%s': %s", var, value);
}
static int init_object_disambiguation(const char *name, int len,
struct disambiguate_state *ds)
{
int i;
if (len < MINIMUM_ABBREV || len > GIT_SHA1_HEXSZ)
return -1;
memset(ds, 0, sizeof(*ds));
for (i = 0; i < len ;i++) {
unsigned char c = name[i];
unsigned char val;
if (c >= '0' && c <= '9')
val = c - '0';
else if (c >= 'a' && c <= 'f')
val = c - 'a' + 10;
else if (c >= 'A' && c <='F') {
val = c - 'A' + 10;
c -= 'A' - 'a';
}
else
return -1;
ds->hex_pfx[i] = c;
if (!(i & 1))
val <<= 4;
ds->bin_pfx.hash[i >> 1] |= val;
}
ds->len = len;
ds->hex_pfx[len] = '\0';
prepare_alt_odb();
return 0;
}
static int show_ambiguous_object(const struct object_id *oid, void *data)
{
const struct disambiguate_state *ds = data;
struct strbuf desc = STRBUF_INIT;
int type;
if (ds->fn && !ds->fn(oid, ds->cb_data))
return 0;
type = sha1_object_info(oid->hash, NULL);
if (type == OBJ_COMMIT) {
struct commit *commit = lookup_commit(oid);
if (commit) {
struct pretty_print_context pp = {0};
pp.date_mode.type = DATE_SHORT;
format_commit_message(commit, " %ad - %s", &desc, &pp);
}
} else if (type == OBJ_TAG) {
struct tag *tag = lookup_tag(oid);
if (!parse_tag(tag) && tag->tag)
strbuf_addf(&desc, " %s", tag->tag);
}
advise(" %s %s%s",
find_unique_abbrev(oid->hash, DEFAULT_ABBREV),
typename(type) ? typename(type) : "unknown type",
desc.buf);
strbuf_release(&desc);
return 0;
}
static int get_short_oid(const char *name, int len, struct object_id *oid,
unsigned flags)
{
int status;
struct disambiguate_state ds;
int quietly = !!(flags & GET_OID_QUIETLY);
if (init_object_disambiguation(name, len, &ds) < 0)
return -1;
if (HAS_MULTI_BITS(flags & GET_OID_DISAMBIGUATORS))
die("BUG: multiple get_short_oid disambiguator flags");
if (flags & GET_OID_COMMIT)
ds.fn = disambiguate_commit_only;
else if (flags & GET_OID_COMMITTISH)
ds.fn = disambiguate_committish_only;
else if (flags & GET_OID_TREE)
ds.fn = disambiguate_tree_only;
else if (flags & GET_OID_TREEISH)
ds.fn = disambiguate_treeish_only;
else if (flags & GET_OID_BLOB)
ds.fn = disambiguate_blob_only;
else
ds.fn = default_disambiguate_hint;
find_short_object_filename(&ds);
find_short_packed_object(&ds);
status = finish_object_disambiguation(&ds, oid);
if (!quietly && (status == SHORT_NAME_AMBIGUOUS)) {
error(_("short SHA1 %s is ambiguous"), ds.hex_pfx);
/*
* We may still have ambiguity if we simply saw a series of
* candidates that did not satisfy our hint function. In
* that case, we still want to show them, so disable the hint
* function entirely.
*/
if (!ds.ambiguous)
ds.fn = NULL;
advise(_("The candidates are:"));
for_each_abbrev(ds.hex_pfx, show_ambiguous_object, &ds);
}
return status;
}
static int collect_ambiguous(const struct object_id *oid, void *data)
{
oid_array_append(data, oid);
return 0;
}
int for_each_abbrev(const char *prefix, each_abbrev_fn fn, void *cb_data)
{
struct oid_array collect = OID_ARRAY_INIT;
struct disambiguate_state ds;
int ret;
if (init_object_disambiguation(prefix, strlen(prefix), &ds) < 0)
return -1;
ds.always_call_fn = 1;
ds.fn = collect_ambiguous;
ds.cb_data = &collect;
find_short_object_filename(&ds);
find_short_packed_object(&ds);
ret = oid_array_for_each_unique(&collect, fn, cb_data);
oid_array_clear(&collect);
return ret;
}
/*
* Return the slot of the most-significant bit set in "val". There are various
* ways to do this quickly with fls() or __builtin_clzl(), but speed is
* probably not a big deal here.
*/
static unsigned msb(unsigned long val)
{
unsigned r = 0;
while (val >>= 1)
r++;
return r;
}
struct min_abbrev_data {
unsigned int init_len;
unsigned int cur_len;
char *hex;
const unsigned char *hash;
};
static inline char get_hex_char_from_oid(const struct object_id *oid,
unsigned int pos)
{
static const char hex[] = "0123456789abcdef";
if ((pos & 1) == 0)
return hex[oid->hash[pos >> 1] >> 4];
else
return hex[oid->hash[pos >> 1] & 0xf];
}
static int extend_abbrev_len(const struct object_id *oid, void *cb_data)
{
struct min_abbrev_data *mad = cb_data;
unsigned int i = mad->init_len;
while (mad->hex[i] && mad->hex[i] == get_hex_char_from_oid(oid, i))
i++;
if (i < GIT_MAX_RAWSZ && i >= mad->cur_len)
mad->cur_len = i + 1;
return 0;
}
static void find_abbrev_len_for_pack(struct packed_git *p,
struct min_abbrev_data *mad)
{
int match = 0;
uint32_t num, last, first = 0;
struct object_id oid;
if (open_pack_index(p) || !p->num_objects)
return;
num = p->num_objects;
last = num;
while (first < last) {
uint32_t mid = first + (last - first) / 2;
const unsigned char *current;
int cmp;
current = nth_packed_object_sha1(p, mid);
cmp = hashcmp(mad->hash, current);
if (!cmp) {
match = 1;
first = mid;
break;
}
if (cmp > 0) {
first = mid + 1;
continue;
}
last = mid;
}
/*
* first is now the position in the packfile where we would insert
* mad->hash if it does not exist (or the position of mad->hash if
* it does exist). Hence, we consider a maximum of three objects
* nearby for the abbreviation length.
*/
mad->init_len = 0;
if (!match) {
nth_packed_object_oid(&oid, p, first);
extend_abbrev_len(&oid, mad);
} else if (first < num - 1) {
nth_packed_object_oid(&oid, p, first + 1);
extend_abbrev_len(&oid, mad);
}
if (first > 0) {
nth_packed_object_oid(&oid, p, first - 1);
extend_abbrev_len(&oid, mad);
}
mad->init_len = mad->cur_len;
}
static void find_abbrev_len_packed(struct min_abbrev_data *mad)
{
struct packed_git *p;
prepare_packed_git();
for (p = packed_git; p; p = p->next)
find_abbrev_len_for_pack(p, mad);
}
int find_unique_abbrev_r(char *hex, const unsigned char *sha1, int len)
{
struct disambiguate_state ds;
struct min_abbrev_data mad;
struct object_id oid_ret;
if (len < 0) {
unsigned long count = approximate_object_count();
/*
* Add one because the MSB only tells us the highest bit set,
* not including the value of all the _other_ bits (so "15"
* is only one off of 2^4, but the MSB is the 3rd bit.
*/
len = msb(count) + 1;
/*
* We now know we have on the order of 2^len objects, which
* expects a collision at 2^(len/2). But we also care about hex
* chars, not bits, and there are 4 bits per hex. So all
* together we need to divide by 2 and round up.
*/
len = DIV_ROUND_UP(len, 2);
/*
* For very small repos, we stick with our regular fallback.
*/
if (len < FALLBACK_DEFAULT_ABBREV)
len = FALLBACK_DEFAULT_ABBREV;
}
sha1_to_hex_r(hex, sha1);
if (len == GIT_SHA1_HEXSZ || !len)
return GIT_SHA1_HEXSZ;
mad.init_len = len;
mad.cur_len = len;
mad.hex = hex;
mad.hash = sha1;
find_abbrev_len_packed(&mad);
if (init_object_disambiguation(hex, mad.cur_len, &ds) < 0)
return -1;
ds.fn = extend_abbrev_len;
ds.always_call_fn = 1;
ds.cb_data = (void *)&mad;
find_short_object_filename(&ds);
(void)finish_object_disambiguation(&ds, &oid_ret);
hex[mad.cur_len] = 0;
return mad.cur_len;
}
const char *find_unique_abbrev(const unsigned char *sha1, int len)
{
static int bufno;
static char hexbuffer[4][GIT_MAX_HEXSZ + 1];
char *hex = hexbuffer[bufno];
bufno = (bufno + 1) % ARRAY_SIZE(hexbuffer);
find_unique_abbrev_r(hex, sha1, len);
return hex;
}
static int ambiguous_path(const char *path, int len)
{
int slash = 1;
int cnt;
for (cnt = 0; cnt < len; cnt++) {
switch (*path++) {
case '\0':
break;
case '/':
if (slash)
break;
slash = 1;
continue;
case '.':
continue;
default:
slash = 0;
continue;
}
break;
}
return slash;
}
static inline int at_mark(const char *string, int len,
const char **suffix, int nr)
{
int i;
for (i = 0; i < nr; i++) {
int suffix_len = strlen(suffix[i]);
if (suffix_len <= len
&& !strncasecmp(string, suffix[i], suffix_len))
return suffix_len;
}
return 0;
}
static inline int upstream_mark(const char *string, int len)
{
const char *suffix[] = { "@{upstream}", "@{u}" };
return at_mark(string, len, suffix, ARRAY_SIZE(suffix));
}
static inline int push_mark(const char *string, int len)
{
const char *suffix[] = { "@{push}" };
return at_mark(string, len, suffix, ARRAY_SIZE(suffix));
}
static int get_oid_1(const char *name, int len, struct object_id *oid, unsigned lookup_flags);
static int interpret_nth_prior_checkout(const char *name, int namelen, struct strbuf *buf);
static int get_oid_basic(const char *str, int len, struct object_id *oid,
unsigned int flags)
{
static const char *warn_msg = "refname '%.*s' is ambiguous.";
static const char *object_name_msg = N_(
"Git normally never creates a ref that ends with 40 hex characters\n"
"because it will be ignored when you just specify 40-hex. These refs\n"
"may be created by mistake. For example,\n"
"\n"
" git checkout -b $br $(git rev-parse ...)\n"
"\n"
"where \"$br\" is somehow empty and a 40-hex ref is created. Please\n"
"examine these refs and maybe delete them. Turn this message off by\n"
"running \"git config advice.objectNameWarning false\"");
struct object_id tmp_oid;
char *real_ref = NULL;
int refs_found = 0;
int at, reflog_len, nth_prior = 0;
if (len == GIT_SHA1_HEXSZ && !get_oid_hex(str, oid)) {
if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) {
refs_found = dwim_ref(str, len, &tmp_oid, &real_ref);
if (refs_found > 0) {
warning(warn_msg, len, str);
if (advice_object_name_warning)
fprintf(stderr, "%s\n", _(object_name_msg));
}
free(real_ref);
}
return 0;
}
/* basic@{time or number or -number} format to query ref-log */
reflog_len = at = 0;
if (len && str[len-1] == '}') {
for (at = len-4; at >= 0; at--) {
if (str[at] == '@' && str[at+1] == '{') {
if (str[at+2] == '-') {
if (at != 0)
/* @{-N} not at start */
return -1;
nth_prior = 1;
continue;
}
if (!upstream_mark(str + at, len - at) &&
!push_mark(str + at, len - at)) {
reflog_len = (len-1) - (at+2);
len = at;
}
break;
}
}
}
/* Accept only unambiguous ref paths. */
if (len && ambiguous_path(str, len))
return -1;
if (nth_prior) {
struct strbuf buf = STRBUF_INIT;
int detached;
if (interpret_nth_prior_checkout(str, len, &buf) > 0) {
detached = (buf.len == GIT_SHA1_HEXSZ && !get_oid_hex(buf.buf, oid));
strbuf_release(&buf);
if (detached)
return 0;
}
}
if (!len && reflog_len)
/* allow "@{...}" to mean the current branch reflog */
refs_found = dwim_ref("HEAD", 4, oid, &real_ref);
else if (reflog_len)
refs_found = dwim_log(str, len, oid, &real_ref);
else
refs_found = dwim_ref(str, len, oid, &real_ref);
if (!refs_found)
return -1;
if (warn_ambiguous_refs && !(flags & GET_OID_QUIETLY) &&
(refs_found > 1 ||
!get_short_oid(str, len, &tmp_oid, GET_OID_QUIETLY)))
warning(warn_msg, len, str);
if (reflog_len) {
int nth, i;
timestamp_t at_time;
timestamp_t co_time;
int co_tz, co_cnt;
/* Is it asking for N-th entry, or approxidate? */
for (i = nth = 0; 0 <= nth && i < reflog_len; i++) {
char ch = str[at+2+i];
if ('0' <= ch && ch <= '9')
nth = nth * 10 + ch - '0';
else
nth = -1;
}
if (100000000 <= nth) {
at_time = nth;
nth = -1;
} else if (0 <= nth)
at_time = 0;
else {
int errors = 0;
char *tmp = xstrndup(str + at + 2, reflog_len);
at_time = approxidate_careful(tmp, &errors);
free(tmp);
if (errors) {
free(real_ref);
return -1;
}
}
if (read_ref_at(real_ref, flags, at_time, nth, oid, NULL,
&co_time, &co_tz, &co_cnt)) {
if (!len) {
if (starts_with(real_ref, "refs/heads/")) {
str = real_ref + 11;
len = strlen(real_ref + 11);
} else {
/* detached HEAD */
str = "HEAD";
len = 4;
}
}
if (at_time) {
if (!(flags & GET_OID_QUIETLY)) {
warning("Log for '%.*s' only goes "
"back to %s.", len, str,
show_date(co_time, co_tz, DATE_MODE(RFC2822)));
}
} else {
if (flags & GET_OID_QUIETLY) {
exit(128);
}
die("Log for '%.*s' only has %d entries.",
len, str, co_cnt);
}
}
}
free(real_ref);
return 0;
}
static int get_parent(const char *name, int len,
struct object_id *result, int idx)
{
struct object_id oid;
int ret = get_oid_1(name, len, &oid, GET_OID_COMMITTISH);
struct commit *commit;
struct commit_list *p;
if (ret)
return ret;
commit = lookup_commit_reference(&oid);
if (parse_commit(commit))
return -1;
if (!idx) {
oidcpy(result, &commit->object.oid);
return 0;
}
p = commit->parents;
while (p) {
if (!--idx) {
oidcpy(result, &p->item->object.oid);
return 0;
}
p = p->next;
}
return -1;
}
static int get_nth_ancestor(const char *name, int len,
struct object_id *result, int generation)
{
struct object_id oid;
struct commit *commit;
int ret;
ret = get_oid_1(name, len, &oid, GET_OID_COMMITTISH);
if (ret)
return ret;
commit = lookup_commit_reference(&oid);
if (!commit)
return -1;
while (generation--) {
if (parse_commit(commit) || !commit->parents)
return -1;
commit = commit->parents->item;
}
oidcpy(result, &commit->object.oid);
return 0;
}
struct object *peel_to_type(const char *name, int namelen,
struct object *o, enum object_type expected_type)
{
if (name && !namelen)
namelen = strlen(name);
while (1) {
if (!o || (!o->parsed && !parse_object(&o->oid)))
return NULL;
if (expected_type == OBJ_ANY || o->type == expected_type)
return o;
if (o->type == OBJ_TAG)
o = ((struct tag*) o)->tagged;
else if (o->type == OBJ_COMMIT)
o = &(((struct commit *) o)->tree->object);
else {
if (name)
error("%.*s: expected %s type, but the object "
"dereferences to %s type",
namelen, name, typename(expected_type),
typename(o->type));
return NULL;
}
}
}
static int peel_onion(const char *name, int len, struct object_id *oid,
unsigned lookup_flags)
{
struct object_id outer;
const char *sp;
unsigned int expected_type = 0;
struct object *o;
/*
* "ref^{type}" dereferences ref repeatedly until you cannot
* dereference anymore, or you get an object of given type,
* whichever comes first. "ref^{}" means just dereference
* tags until you get a non-tag. "ref^0" is a shorthand for
* "ref^{commit}". "commit^{tree}" could be used to find the
* top-level tree of the given commit.
*/
if (len < 4 || name[len-1] != '}')
return -1;
for (sp = name + len - 1; name <= sp; sp--) {
int ch = *sp;
if (ch == '{' && name < sp && sp[-1] == '^')
break;
}
if (sp <= name)
return -1;
sp++; /* beginning of type name, or closing brace for empty */
if (starts_with(sp, "commit}"))
expected_type = OBJ_COMMIT;
else if (starts_with(sp, "tag}"))
expected_type = OBJ_TAG;
else if (starts_with(sp, "tree}"))
expected_type = OBJ_TREE;
else if (starts_with(sp, "blob}"))
expected_type = OBJ_BLOB;
else if (starts_with(sp, "object}"))
expected_type = OBJ_ANY;
else if (sp[0] == '}')
expected_type = OBJ_NONE;
else if (sp[0] == '/')
expected_type = OBJ_COMMIT;
else
return -1;
lookup_flags &= ~GET_OID_DISAMBIGUATORS;
if (expected_type == OBJ_COMMIT)
lookup_flags |= GET_OID_COMMITTISH;
else if (expected_type == OBJ_TREE)
lookup_flags |= GET_OID_TREEISH;
if (get_oid_1(name, sp - name - 2, &outer, lookup_flags))
return -1;
o = parse_object(&outer);
if (!o)
return -1;
if (!expected_type) {
o = deref_tag(o, name, sp - name - 2);
if (!o || (!o->parsed && !parse_object(&o->oid)))
return -1;
oidcpy(oid, &o->oid);
return 0;
}
/*
* At this point, the syntax look correct, so
* if we do not get the needed object, we should
* barf.
*/
o = peel_to_type(name, len, o, expected_type);
if (!o)
return -1;
oidcpy(oid, &o->oid);
if (sp[0] == '/') {
/* "$commit^{/foo}" */
char *prefix;
int ret;
struct commit_list *list = NULL;
/*
* $commit^{/}. Some regex implementation may reject.
* We don't need regex anyway. '' pattern always matches.
*/
if (sp[1] == '}')
return 0;
prefix = xstrndup(sp + 1, name + len - 1 - (sp + 1));
commit_list_insert((struct commit *)o, &list);
ret = get_oid_oneline(prefix, oid, list);
free(prefix);
return ret;
}
return 0;
}
static int get_describe_name(const char *name, int len, struct object_id *oid)
{
const char *cp;
unsigned flags = GET_OID_QUIETLY | GET_OID_COMMIT;
for (cp = name + len - 1; name + 2 <= cp; cp--) {
char ch = *cp;
if (!isxdigit(ch)) {
/* We must be looking at g in "SOMETHING-g"
* for it to be describe output.
*/
if (ch == 'g' && cp[-1] == '-') {
cp++;
len -= cp - name;
return get_short_oid(cp, len, oid, flags);
}
}
}
return -1;
}
static int get_oid_1(const char *name, int len, struct object_id *oid, unsigned lookup_flags)
{
int ret, has_suffix;
const char *cp;
/*
* "name~3" is "name^^^", "name~" is "name~1", and "name^" is "name^1".
*/
has_suffix = 0;
for (cp = name + len - 1; name <= cp; cp--) {
int ch = *cp;
if ('0' <= ch && ch <= '9')
continue;
if (ch == '~' || ch == '^')
has_suffix = ch;
break;
}
if (has_suffix) {
int num = 0;
int len1 = cp - name;
cp++;
while (cp < name + len)
num = num * 10 + *cp++ - '0';
if (!num && len1 == len - 1)
num = 1;
if (has_suffix == '^')
return get_parent(name, len1, oid, num);
/* else if (has_suffix == '~') -- goes without saying */
return get_nth_ancestor(name, len1, oid, num);
}
ret = peel_onion(name, len, oid, lookup_flags);
if (!ret)
return 0;
ret = get_oid_basic(name, len, oid, lookup_flags);
if (!ret)
return 0;
/* It could be describe output that is "SOMETHING-gXXXX" */
ret = get_describe_name(name, len, oid);
if (!ret)
return 0;
return get_short_oid(name, len, oid, lookup_flags);
}
/*
* This interprets names like ':/Initial revision of "git"' by searching
* through history and returning the first commit whose message starts
* the given regular expression.
*
* For negative-matching, prefix the pattern-part with '!-', like: ':/!-WIP'.
*
* For a literal '!' character at the beginning of a pattern, you have to repeat
* that, like: ':/!!foo'
*
* For future extension, all other sequences beginning with ':/!' are reserved.
*/
/* Remember to update object flag allocation in object.h */
#define ONELINE_SEEN (1u<<20)
static int handle_one_ref(const char *path, const struct object_id *oid,
int flag, void *cb_data)
{
struct commit_list **list = cb_data;
struct object *object = parse_object(oid);
if (!object)
return 0;
if (object->type == OBJ_TAG) {
object = deref_tag(object, path, strlen(path));
if (!object)
return 0;
}
if (object->type != OBJ_COMMIT)
return 0;
commit_list_insert((struct commit *)object, list);
return 0;
}
static int get_oid_oneline(const char *prefix, struct object_id *oid,
struct commit_list *list)
{
struct commit_list *backup = NULL, *l;
int found = 0;
int negative = 0;
regex_t regex;
if (prefix[0] == '!') {
prefix++;
if (prefix[0] == '-') {
prefix++;
negative = 1;
} else if (prefix[0] != '!') {
return -1;
}
}
if (regcomp(&regex, prefix, REG_EXTENDED))
return -1;
for (l = list; l; l = l->next) {
l->item->object.flags |= ONELINE_SEEN;
commit_list_insert(l->item, &backup);
}
while (list) {
const char *p, *buf;
struct commit *commit;
int matches;
commit = pop_most_recent_commit(&list, ONELINE_SEEN);
if (!parse_object(&commit->object.oid))
continue;
buf = get_commit_buffer(commit, NULL);
p = strstr(buf, "\n\n");
matches = negative ^ (p && !regexec(&regex, p + 2, 0, NULL, 0));
unuse_commit_buffer(commit, buf);
if (matches) {
oidcpy(oid, &commit->object.oid);
found = 1;
break;
}
}
regfree(&regex);
free_commit_list(list);
for (l = backup; l; l = l->next)
clear_commit_marks(l->item, ONELINE_SEEN);
free_commit_list(backup);
return found ? 0 : -1;
}
struct grab_nth_branch_switch_cbdata {
int remaining;
struct strbuf buf;
};
static int grab_nth_branch_switch(struct object_id *ooid, struct object_id *noid,
const char *email, timestamp_t timestamp, int tz,
const char *message, void *cb_data)
{
struct grab_nth_branch_switch_cbdata *cb = cb_data;
const char *match = NULL, *target = NULL;
size_t len;
if (skip_prefix(message, "checkout: moving from ", &match))
target = strstr(match, " to ");
if (!match || !target)
return 0;
if (--(cb->remaining) == 0) {
len = target - match;
strbuf_reset(&cb->buf);
strbuf_add(&cb->buf, match, len);
return 1; /* we are done */
}
return 0;
}
/*
* Parse @{-N} syntax, return the number of characters parsed
* if successful; otherwise signal an error with negative value.
*/
static int interpret_nth_prior_checkout(const char *name, int namelen,
struct strbuf *buf)
{
long nth;
int retval;
struct grab_nth_branch_switch_cbdata cb;
const char *brace;
char *num_end;
if (namelen < 4)
return -1;
if (name[0] != '@' || name[1] != '{' || name[2] != '-')
return -1;
brace = memchr(name, '}', namelen);
if (!brace)
return -1;
nth = strtol(name + 3, &num_end, 10);
if (num_end != brace)
return -1;
if (nth <= 0)
return -1;
cb.remaining = nth;
strbuf_init(&cb.buf, 20);
retval = 0;
if (0 < for_each_reflog_ent_reverse("HEAD", grab_nth_branch_switch, &cb)) {
strbuf_reset(buf);
strbuf_addbuf(buf, &cb.buf);
retval = brace - name + 1;
}
strbuf_release(&cb.buf);
return retval;
}
int get_oid_mb(const char *name, struct object_id *oid)
{
struct commit *one, *two;
struct commit_list *mbs;
struct object_id oid_tmp;
const char *dots;
int st;
dots = strstr(name, "...");
if (!dots)
return get_oid(name, oid);
if (dots == name)
st = get_oid("HEAD", &oid_tmp);
else {
struct strbuf sb;
strbuf_init(&sb, dots - name);
strbuf_add(&sb, name, dots - name);
st = get_oid_committish(sb.buf, &oid_tmp);
strbuf_release(&sb);
}
if (st)
return st;
one = lookup_commit_reference_gently(&oid_tmp, 0);
if (!one)
return -1;
if (get_oid_committish(dots[3] ? (dots + 3) : "HEAD", &oid_tmp))
return -1;
two = lookup_commit_reference_gently(&oid_tmp, 0);
if (!two)
return -1;
mbs = get_merge_bases(one, two);
if (!mbs || mbs->next)
st = -1;
else {
st = 0;
oidcpy(oid, &mbs->item->object.oid);
}
free_commit_list(mbs);
return st;
}
/* parse @something syntax, when 'something' is not {.*} */
static int interpret_empty_at(const char *name, int namelen, int len, struct strbuf *buf)
{
const char *next;
if (len || name[1] == '{')
return -1;
/* make sure it's a single @, or @@{.*}, not @foo */
next = memchr(name + len + 1, '@', namelen - len - 1);
if (next && next[1] != '{')
return -1;
if (!next)
next = name + namelen;
if (next != name + 1)
return -1;
strbuf_reset(buf);
strbuf_add(buf, "HEAD", 4);
return 1;
}
static int reinterpret(const char *name, int namelen, int len,
struct strbuf *buf, unsigned allowed)
{
/* we have extra data, which might need further processing */
struct strbuf tmp = STRBUF_INIT;
int used = buf->len;
int ret;
strbuf_add(buf, name + len, namelen - len);
ret = interpret_branch_name(buf->buf, buf->len, &tmp, allowed);
/* that data was not interpreted, remove our cruft */
if (ret < 0) {
strbuf_setlen(buf, used);
return len;
}
strbuf_reset(buf);
strbuf_addbuf(buf, &tmp);
strbuf_release(&tmp);
/* tweak for size of {-N} versus expanded ref name */
return ret - used + len;
}
static void set_shortened_ref(struct strbuf *buf, const char *ref)
{
char *s = shorten_unambiguous_ref(ref, 0);
strbuf_reset(buf);
strbuf_addstr(buf, s);
free(s);
}
static int branch_interpret_allowed(const char *refname, unsigned allowed)
{
if (!allowed)
return 1;
if ((allowed & INTERPRET_BRANCH_LOCAL) &&
starts_with(refname, "refs/heads/"))
return 1;
if ((allowed & INTERPRET_BRANCH_REMOTE) &&
starts_with(refname, "refs/remotes/"))
return 1;
return 0;
}
static int interpret_branch_mark(const char *name, int namelen,
int at, struct strbuf *buf,
int (*get_mark)(const char *, int),
const char *(*get_data)(struct branch *,
struct strbuf *),
unsigned allowed)
{
int len;
struct branch *branch;
struct strbuf err = STRBUF_INIT;
const char *value;
len = get_mark(name + at, namelen - at);
if (!len)
return -1;
if (memchr(name, ':', at))
return -1;
if (at) {
char *name_str = xmemdupz(name, at);
branch = branch_get(name_str);
free(name_str);
} else
branch = branch_get(NULL);
value = get_data(branch, &err);
if (!value)
die("%s", err.buf);
if (!branch_interpret_allowed(value, allowed))
return -1;
set_shortened_ref(buf, value);
return len + at;
}
int interpret_branch_name(const char *name, int namelen, struct strbuf *buf,
unsigned allowed)
{
char *at;
const char *start;
int len;
if (!namelen)
namelen = strlen(name);
if (!allowed || (allowed & INTERPRET_BRANCH_LOCAL)) {
len = interpret_nth_prior_checkout(name, namelen, buf);
if (!len) {
return len; /* syntax Ok, not enough switches */
} else if (len > 0) {
if (len == namelen)
return len; /* consumed all */
else
return reinterpret(name, namelen, len, buf, allowed);
}
}
for (start = name;
(at = memchr(start, '@', namelen - (start - name)));
start = at + 1) {
if (!allowed || (allowed & INTERPRET_BRANCH_HEAD)) {
len = interpret_empty_at(name, namelen, at - name, buf);
if (len > 0)
return reinterpret(name, namelen, len, buf,
allowed);
}
len = interpret_branch_mark(name, namelen, at - name, buf,
upstream_mark, branch_get_upstream,
allowed);
if (len > 0)
return len;
len = interpret_branch_mark(name, namelen, at - name, buf,
push_mark, branch_get_push,
allowed);
if (len > 0)
return len;
}
return -1;
}
void strbuf_branchname(struct strbuf *sb, const char *name, unsigned allowed)
{
int len = strlen(name);
int used = interpret_branch_name(name, len, sb, allowed);
if (used < 0)
used = 0;
strbuf_add(sb, name + used, len - used);
}
int strbuf_check_branch_ref(struct strbuf *sb, const char *name)
{
if (startup_info->have_repository)
strbuf_branchname(sb, name, INTERPRET_BRANCH_LOCAL);
else
strbuf_addstr(sb, name);
/*
* This splice must be done even if we end up rejecting the
* name; builtin/branch.c::copy_or_rename_branch() still wants
* to see what the name expanded to so that "branch -m" can be
* used as a tool to correct earlier mistakes.
*/
strbuf_splice(sb, 0, 0, "refs/heads/", 11);
if (*name == '-' ||
!strcmp(sb->buf, "refs/heads/HEAD"))
return -1;
return check_refname_format(sb->buf, 0);
}
/*
* This is like "get_oid_basic()", except it allows "object ID expressions",
* notably "xyz^" for "parent of xyz"
*/
int get_oid(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, 0, oid, &unused);
}
/*
* Many callers know that the user meant to name a commit-ish by
* syntactical positions where the object name appears. Calling this
* function allows the machinery to disambiguate shorter-than-unique
* abbreviated object names between commit-ish and others.
*
* Note that this does NOT error out when the named object is not a
* commit-ish. It is merely to give a hint to the disambiguation
* machinery.
*/
int get_oid_committish(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, GET_OID_COMMITTISH,
oid, &unused);
}
int get_oid_treeish(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, GET_OID_TREEISH,
oid, &unused);
}
int get_oid_commit(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, GET_OID_COMMIT,
oid, &unused);
}
int get_oid_tree(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, GET_OID_TREE,
oid, &unused);
}
int get_oid_blob(const char *name, struct object_id *oid)
{
struct object_context unused;
return get_oid_with_context(name, GET_OID_BLOB,
oid, &unused);
}
/* Must be called only when object_name:filename doesn't exist. */
static void diagnose_invalid_oid_path(const char *prefix,
const char *filename,
const struct object_id *tree_oid,
const char *object_name,
int object_name_len)
{
struct object_id oid;
unsigned mode;
if (!prefix)
prefix = "";
if (file_exists(filename))
die("Path '%s' exists on disk, but not in '%.*s'.",
filename, object_name_len, object_name);
if (is_missing_file_error(errno)) {
char *fullname = xstrfmt("%s%s", prefix, filename);
if (!get_tree_entry(tree_oid->hash, fullname,
oid.hash, &mode)) {
die("Path '%s' exists, but not '%s'.\n"
"Did you mean '%.*s:%s' aka '%.*s:./%s'?",
fullname,
filename,
object_name_len, object_name,
fullname,
object_name_len, object_name,
filename);
}
die("Path '%s' does not exist in '%.*s'",
filename, object_name_len, object_name);
}
}
/* Must be called only when :stage:filename doesn't exist. */
static void diagnose_invalid_index_path(int stage,
const char *prefix,
const char *filename)
{
const struct cache_entry *ce;
int pos;
unsigned namelen = strlen(filename);
struct strbuf fullname = STRBUF_INIT;
if (!prefix)
prefix = "";
/* Wrong stage number? */
pos = cache_name_pos(filename, namelen);
if (pos < 0)
pos = -pos - 1;
if (pos < active_nr) {
ce = active_cache[pos];
if (ce_namelen(ce) == namelen &&
!memcmp(ce->name, filename, namelen))
die("Path '%s' is in the index, but not at stage %d.\n"
"Did you mean ':%d:%s'?",
filename, stage,
ce_stage(ce), filename);
}
/* Confusion between relative and absolute filenames? */
strbuf_addstr(&fullname, prefix);
strbuf_addstr(&fullname, filename);
pos = cache_name_pos(fullname.buf, fullname.len);
if (pos < 0)
pos = -pos - 1;
if (pos < active_nr) {
ce = active_cache[pos];
if (ce_namelen(ce) == fullname.len &&
!memcmp(ce->name, fullname.buf, fullname.len))
die("Path '%s' is in the index, but not '%s'.\n"
"Did you mean ':%d:%s' aka ':%d:./%s'?",
fullname.buf, filename,
ce_stage(ce), fullname.buf,
ce_stage(ce), filename);
}
if (file_exists(filename))
die("Path '%s' exists on disk, but not in the index.", filename);
if (is_missing_file_error(errno))
die("Path '%s' does not exist (neither on disk nor in the index).",
filename);
strbuf_release(&fullname);
}
static char *resolve_relative_path(const char *rel)
{
if (!starts_with(rel, "./") && !starts_with(rel, "../"))
return NULL;
if (!is_inside_work_tree())
die("relative path syntax can't be used outside working tree.");
/* die() inside prefix_path() if resolved path is outside worktree */
return prefix_path(startup_info->prefix,
startup_info->prefix ? strlen(startup_info->prefix) : 0,
rel);
}
static int get_oid_with_context_1(const char *name,
unsigned flags,
const char *prefix,
struct object_id *oid,
struct object_context *oc)
{
int ret, bracket_depth;
int namelen = strlen(name);
const char *cp;
int only_to_die = flags & GET_OID_ONLY_TO_DIE;
if (only_to_die)
flags |= GET_OID_QUIETLY;
memset(oc, 0, sizeof(*oc));
oc->mode = S_IFINVALID;
strbuf_init(&oc->symlink_path, 0);
ret = get_oid_1(name, namelen, oid, flags);
if (!ret)
return ret;
/*
* sha1:path --> object name of path in ent sha1
* :path -> object name of absolute path in index
* :./path -> object name of path relative to cwd in index
* :[0-3]:path -> object name of path in index at stage
* :/foo -> recent commit matching foo
*/
if (name[0] == ':') {
int stage = 0;
const struct cache_entry *ce;
char *new_path = NULL;
int pos;
if (!only_to_die && namelen > 2 && name[1] == '/') {
struct commit_list *list = NULL;
for_each_ref(handle_one_ref, &list);
commit_list_sort_by_date(&list);
return get_oid_oneline(name + 2, oid, list);
}
if (namelen < 3 ||
name[2] != ':' ||
name[1] < '0' || '3' < name[1])
cp = name + 1;
else {
stage = name[1] - '0';
cp = name + 3;
}
new_path = resolve_relative_path(cp);
if (!new_path) {
namelen = namelen - (cp - name);
} else {
cp = new_path;
namelen = strlen(cp);
}
if (flags & GET_OID_RECORD_PATH)
oc->path = xstrdup(cp);
if (!active_cache)
read_cache();
pos = cache_name_pos(cp, namelen);
if (pos < 0)
pos = -pos - 1;
while (pos < active_nr) {
ce = active_cache[pos];
if (ce_namelen(ce) != namelen ||
memcmp(ce->name, cp, namelen))
break;
if (ce_stage(ce) == stage) {
oidcpy(oid, &ce->oid);
oc->mode = ce->ce_mode;
free(new_path);
return 0;
}
pos++;
}
if (only_to_die && name[1] && name[1] != '/')
diagnose_invalid_index_path(stage, prefix, cp);
free(new_path);
return -1;
}
for (cp = name, bracket_depth = 0; *cp; cp++) {
if (*cp == '{')
bracket_depth++;
else if (bracket_depth && *cp == '}')
bracket_depth--;
else if (!bracket_depth && *cp == ':')
break;
}
if (*cp == ':') {
struct object_id tree_oid;
int len = cp - name;
unsigned sub_flags = flags;
sub_flags &= ~GET_OID_DISAMBIGUATORS;
sub_flags |= GET_OID_TREEISH;
if (!get_oid_1(name, len, &tree_oid, sub_flags)) {
const char *filename = cp+1;
char *new_filename = NULL;
new_filename = resolve_relative_path(filename);
if (new_filename)
filename = new_filename;
if (flags & GET_OID_FOLLOW_SYMLINKS) {
ret = get_tree_entry_follow_symlinks(tree_oid.hash,
filename, oid->hash, &oc->symlink_path,
&oc->mode);
} else {
ret = get_tree_entry(tree_oid.hash, filename,
oid->hash, &oc->mode);
if (ret && only_to_die) {
diagnose_invalid_oid_path(prefix,
filename,
&tree_oid,
name, len);
}
}
hashcpy(oc->tree, tree_oid.hash);
if (flags & GET_OID_RECORD_PATH)
oc->path = xstrdup(filename);
free(new_filename);
return ret;
} else {
if (only_to_die)
die("Invalid object name '%.*s'.", len, name);
}
}
return ret;
}
/*
* Call this function when you know "name" given by the end user must
* name an object but it doesn't; the function _may_ die with a better
* diagnostic message than "no such object 'name'", e.g. "Path 'doc' does not
* exist in 'HEAD'" when given "HEAD:doc", or it may return in which case
* you have a chance to diagnose the error further.
*/
void maybe_die_on_misspelt_object_name(const char *name, const char *prefix)
{
struct object_context oc;
struct object_id oid;
get_oid_with_context_1(name, GET_OID_ONLY_TO_DIE, prefix, &oid, &oc);
}
int get_oid_with_context(const char *str, unsigned flags, struct object_id *oid, struct object_context *oc)
{
if (flags & GET_OID_FOLLOW_SYMLINKS && flags & GET_OID_ONLY_TO_DIE)
die("BUG: incompatible flags for get_sha1_with_context");
return get_oid_with_context_1(str, flags, NULL, oid, oc);
}