#include "cache.h"
+#include "tag.h"
#include "commit.h"
+#include "tree.h"
+#include "blob.h"
static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
{
return NULL;
}
+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;
+ }
+ return slash;
+ }
+ return slash;
+}
+
static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
{
static const char *prefix[] = {
NULL
};
const char **p;
+ int found = 0;
if (len == 40 && !get_sha1_hex(str, sha1))
return 0;
+ /* Accept only unambiguous ref paths. */
+ 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))
- return 0;
- }
- return -1;
+ 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);
+ }
+ }
+ switch (found) {
+ case 0:
+ return -1;
+ case 1:
+ return 0;
+ default:
+ return error("ambiguous refname '%.*s'", len, str);
+ }
}
static int get_sha1_1(const char *name, int len, unsigned char *sha1);
return 0;
}
+static int peel_onion(const char *name, int len, unsigned char *sha1)
+{
+ unsigned char outer[20];
+ const char *sp;
+ const char *type_string = NULL;
+ 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 (!strncmp(commit_type, sp, 6) && sp[6] == '}')
+ type_string = commit_type;
+ else if (!strncmp(tree_type, sp, 4) && sp[4] == '}')
+ type_string = tree_type;
+ else if (!strncmp(blob_type, sp, 4) && sp[4] == '}')
+ type_string = blob_type;
+ else if (sp[0] == '}')
+ type_string = NULL;
+ else
+ return -1;
+
+ if (get_sha1_1(name, sp - name - 2, outer))
+ return -1;
+
+ o = parse_object(outer);
+ if (!o)
+ return -1;
+ if (!type_string) {
+ o = deref_tag(o, name, sp - name - 2);
+ if (!o || (!o->parsed && !parse_object(o->sha1)))
+ return -1;
+ memcpy(sha1, o->sha1, 20);
+ }
+ else {
+ /* At this point, the syntax look correct, so
+ * if we do not get the needed object, we should
+ * barf.
+ */
+
+ while (1) {
+ if (!o || (!o->parsed && !parse_object(o->sha1)))
+ return -1;
+ if (o->type == type_string) {
+ memcpy(sha1, o->sha1, 20);
+ return 0;
+ }
+ if (o->type == tag_type)
+ o = ((struct tag*) o)->tagged;
+ else if (o->type == commit_type)
+ o = &(((struct commit *) o)->tree->object);
+ else
+ return error("%.*s: expected %s type, but the object dereferences to %s type",
+ len, name, type_string,
+ o->type);
+ if (!o->parsed)
+ parse_object(o->sha1);
+ }
+ }
+ return 0;
+}
+
static int get_sha1_1(const char *name, int len, unsigned char *sha1)
{
int parent, ret;
return get_nth_ancestor(name, len1, sha1, parent);
}
+ ret = peel_onion(name, len, sha1);
+ if (!ret)
+ return 0;
+
ret = get_sha1_basic(name, len, sha1);
if (!ret)
return 0;
projects / git.git / blobdiff