#include "commit.h"
#include "tree.h"
#include "blob.h"
+#include "tree-walk.h"
static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
{
}
/* Both have unique ones -- do they match? */
if (memcmp(packed_sha1, unpacked_sha1, 20))
- return -2;
+ return SHORT_NAME_AMBIGUOUS;
memcpy(sha1, packed_sha1, 20);
return 0;
}
char canonical[40];
unsigned char res[20];
- if (len < 4)
+ if (len < MINIMUM_ABBREV)
return -1;
memset(res, 0, 20);
memset(canonical, 'x', 40);
const char *find_unique_abbrev(const unsigned char *sha1, int len)
{
- int status;
+ int status, is_null;
static char hex[41];
+
+ is_null = !memcmp(sha1, null_sha1, 20);
memcpy(hex, sha1_to_hex(sha1), 40);
+ if (len == 40)
+ return hex;
while (len < 40) {
unsigned char sha1_ret[20];
status = get_short_sha1(hex, len, sha1_ret, 1);
- if (!status) {
+ if (!status ||
+ (is_null && status != SHORT_NAME_AMBIGUOUS)) {
hex[len] = 0;
return hex;
}
slash = 0;
continue;
}
- return slash;
+ break;
}
return slash;
}
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
{
- static const char *prefix[] = {
- "",
- "refs",
- "refs/tags",
- "refs/heads",
+ static const char *fmt[] = {
+ "%.*s",
+ "refs/%.*s",
+ "refs/tags/%.*s",
+ "refs/heads/%.*s",
+ "refs/remotes/%.*s",
+ "refs/remotes/%.*s/HEAD",
NULL
};
const char **p;
- int found = 0;
+ const char *warning = "warning: refname '%.*s' is ambiguous.\n";
+ char *pathname;
+ int already_found = 0;
+ unsigned char *this_result;
+ unsigned char sha1_from_ref[20];
if (len == 40 && !get_sha1_hex(str, sha1))
return 0;
if (ambiguous_path(str, len))
return -1;
- for (p = prefix; *p; p++) {
- char *pathname = git_path("%s/%.*s", *p, len, str);
-
- if (!read_ref(pathname, sha1)) {
- /* Must be unique; i.e. when heads/foo and
- * tags/foo are both present, reject "foo".
- */
- if (1 < found++)
- return -1;
- }
-
- /* We want to allow .git/description file and
- * "description" branch to exist at the same time.
- * "git-rev-parse description" should silently skip
- * .git/description file as a candidate for
- * get_sha1(). However, having garbage file anywhere
- * under refs/ is not OK, and we would not have caught
- * ambiguous heads and tags with the above test.
- */
- else if (**p && !access(pathname, F_OK)) {
- /* Garbage exists under .git/refs */
- return error("garbage ref found '%s'", pathname);
+ for (p = fmt; *p; p++) {
+ this_result = already_found ? sha1_from_ref : sha1;
+ pathname = git_path(*p, len, str);
+ if (!read_ref(pathname, this_result)) {
+ if (warn_ambiguous_refs) {
+ if (already_found)
+ fprintf(stderr, warning, len, str);
+ already_found++;
+ }
+ else
+ return 0;
}
}
- switch (found) {
- case 0:
- return -1;
- case 1:
+ if (already_found)
return 0;
- default:
- return error("ambiguous refname '%.*s'", len, str);
- }
+ return -1;
}
static int get_sha1_1(const char *name, int len, unsigned char *sha1);
static int get_sha1_1(const char *name, int len, unsigned char *sha1)
{
- int parent, ret;
+ int ret, has_suffix;
const char *cp;
- /* foo^[0-9] or foo^ (== foo^1); we do not do more than 9 parents. */
- if (len > 2 && name[len-2] == '^' &&
- name[len-1] >= '0' && name[len-1] <= '9') {
- parent = name[len-1] - '0';
- len -= 2;
- }
- else if (len > 1 && name[len-1] == '^') {
- parent = 1;
- len--;
- } else
- parent = -1;
-
- if (parent >= 0)
- return get_parent(name, len, sha1, parent);
-
/* "name~3" is "name^^^",
- * "name~12" is "name^^^^^^^^^^^^", and
* "name~" and "name~0" are name -- not "name^0"!
+ * "name^" is not "name^0"; it is "name^1".
*/
- parent = 0;
+ has_suffix = 0;
for (cp = name + len - 1; name <= cp; cp--) {
int ch = *cp;
if ('0' <= ch && ch <= '9')
continue;
- if (ch != '~')
- parent = -1;
+ if (ch == '~' || ch == '^')
+ has_suffix = ch;
break;
}
- if (!parent && *cp == '~') {
+
+ if (has_suffix) {
+ int num = 0;
int len1 = cp - name;
cp++;
while (cp < name + len)
- parent = parent * 10 + *cp++ - '0';
- return get_nth_ancestor(name, len1, sha1, parent);
+ num = num * 10 + *cp++ - '0';
+ if (has_suffix == '^') {
+ if (!num && len1 == len - 1)
+ num = 1;
+ return get_parent(name, len1, sha1, num);
+ }
+ /* else if (has_suffix == '~') -- goes without saying */
+ return get_nth_ancestor(name, len1, sha1, num);
}
ret = peel_onion(name, len, sha1);
*/
int get_sha1(const char *name, unsigned char *sha1)
{
+ int ret;
+ unsigned unused;
+ int namelen = strlen(name);
+ const char *cp;
+
prepare_alt_odb();
- return get_sha1_1(name, strlen(name), sha1);
+ ret = get_sha1_1(name, namelen, sha1);
+ if (!ret)
+ return ret;
+ /* sha1:path --> object name of path in ent sha1
+ * :path -> object name of path in index
+ * :[0-3]:path -> object name of path in index at stage
+ */
+ if (name[0] == ':') {
+ int stage = 0;
+ struct cache_entry *ce;
+ int pos;
+ if (namelen < 3 ||
+ name[2] != ':' ||
+ name[1] < '0' || '3' < name[1])
+ cp = name + 1;
+ else {
+ stage = name[1] - '0';
+ cp = name + 3;
+ }
+ namelen = namelen - (cp - name);
+ if (!active_cache)
+ read_cache();
+ if (active_nr < 0)
+ return -1;
+ 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) {
+ memcpy(sha1, ce->sha1, 20);
+ return 0;
+ }
+ }
+ return -1;
+ }
+ cp = strchr(name, ':');
+ if (cp) {
+ unsigned char tree_sha1[20];
+ if (!get_sha1_1(name, cp-name, tree_sha1))
+ return get_tree_entry(tree_sha1, cp+1, sha1,
+ &unused);
+ }
+ return ret;
}