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index 30e08482a076c3a878588f93b7be680e891fbe12..e7843eb6b70b7de6c1ed1992db7adee1d99b27bc 100644 (file)
--- a/refs.c
+++ b/refs.c
/* ISSYMREF=0x01, ISPACKED=0x02 and ISBROKEN=0x04 are public interfaces */
#define REF_KNOWS_PEELED 0x10
-struct ref_list {
- struct ref_list *next;
+struct ref_entry {
unsigned char flag; /* ISSYMREF? ISPACKED? */
unsigned char sha1[20];
unsigned char peeled[20];
char name[FLEX_ARRAY];
};
+struct ref_array {
+ int nr, alloc;
+ struct ref_entry **refs;
+};
+
static const char *parse_ref_line(char *line, unsigned char *sha1)
{
/*
return line;
}
-static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
- int flag, struct ref_list *list,
- struct ref_list **new_entry)
+static void add_ref(const char *name, const unsigned char *sha1,
+ int flag, int check_name, struct ref_array *refs,
+ struct ref_entry **new_entry)
{
int len;
- struct ref_list *entry;
+ struct ref_entry *entry;
/* Allocate it and add it in.. */
len = strlen(name) + 1;
- entry = xmalloc(sizeof(struct ref_list) + len);
+ entry = xmalloc(sizeof(struct ref_entry) + len);
hashcpy(entry->sha1, sha1);
hashclr(entry->peeled);
- if (check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
+ if (check_name &&
+ check_refname_format(name, REFNAME_ALLOW_ONELEVEL|REFNAME_DOT_COMPONENT))
die("Reference has invalid format: '%s'", name);
memcpy(entry->name, name, len);
entry->flag = flag;
- entry->next = list;
if (new_entry)
*new_entry = entry;
- return entry;
+ ALLOC_GROW(refs->refs, refs->nr + 1, refs->alloc);
+ refs->refs[refs->nr++] = entry;
+}
+
+static int ref_entry_cmp(const void *a, const void *b)
+{
+ struct ref_entry *one = *(struct ref_entry **)a;
+ struct ref_entry *two = *(struct ref_entry **)b;
+ return strcmp(one->name, two->name);
}
-/* merge sort the ref list */
-static struct ref_list *sort_ref_list(struct ref_list *list)
+static void sort_ref_array(struct ref_array *array)
{
- int psize, qsize, last_merge_count, cmp;
- struct ref_list *p, *q, *l, *e;
- struct ref_list *new_list = list;
- int k = 1;
- int merge_count = 0;
+ int i = 0, j = 1;
- if (!list)
- return list;
+ /* Nothing to sort unless there are at least two entries */
+ if (array->nr < 2)
+ return;
- do {
- last_merge_count = merge_count;
- merge_count = 0;
+ qsort(array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
- psize = 0;
+ /* Remove any duplicates from the ref_array */
+ for (; j < array->nr; j++) {
+ struct ref_entry *a = array->refs[i];
+ struct ref_entry *b = array->refs[j];
+ if (!strcmp(a->name, b->name)) {
+ if (hashcmp(a->sha1, b->sha1))
+ die("Duplicated ref, and SHA1s don't match: %s",
+ a->name);
+ warning("Duplicated ref: %s", a->name);
+ free(b);
+ continue;
+ }
+ i++;
+ array->refs[i] = array->refs[j];
+ }
+ array->nr = i + 1;
+}
- p = new_list;
- q = new_list;
- new_list = NULL;
- l = NULL;
+static struct ref_entry *search_ref_array(struct ref_array *array, const char *name)
+{
+ struct ref_entry *e, **r;
+ int len;
- while (p) {
- merge_count++;
+ if (name == NULL)
+ return NULL;
- while (psize < k && q->next) {
- q = q->next;
- psize++;
- }
- qsize = k;
-
- while ((psize > 0) || (qsize > 0 && q)) {
- if (qsize == 0 || !q) {
- e = p;
- p = p->next;
- psize--;
- } else if (psize == 0) {
- e = q;
- q = q->next;
- qsize--;
- } else {
- cmp = strcmp(q->name, p->name);
- if (cmp < 0) {
- e = q;
- q = q->next;
- qsize--;
- } else if (cmp > 0) {
- e = p;
- p = p->next;
- psize--;
- } else {
- if (hashcmp(q->sha1, p->sha1))
- die("Duplicated ref, and SHA1s don't match: %s",
- q->name);
- warning("Duplicated ref: %s", q->name);
- e = q;
- q = q->next;
- qsize--;
- free(e);
- e = p;
- p = p->next;
- psize--;
- }
- }
+ if (!array->nr)
+ return NULL;
- e->next = NULL;
+ len = strlen(name) + 1;
+ e = xmalloc(sizeof(struct ref_entry) + len);
+ memcpy(e->name, name, len);
- if (l)
- l->next = e;
- if (!new_list)
- new_list = e;
- l = e;
- }
+ r = bsearch(&e, array->refs, array->nr, sizeof(*array->refs), ref_entry_cmp);
- p = q;
- };
+ free(e);
- k = k * 2;
- } while ((last_merge_count != merge_count) || (last_merge_count != 1));
+ if (r == NULL)
+ return NULL;
- return new_list;
+ return *r;
}
/*
* Future: need to be in "struct repository"
* when doing a full libification.
*/
-static struct cached_refs {
+static struct ref_cache {
+ struct ref_cache *next;
char did_loose;
char did_packed;
- struct ref_list *loose;
- struct ref_list *packed;
-} cached_refs, submodule_refs;
-static struct ref_list *current_ref;
+ struct ref_array loose;
+ struct ref_array packed;
+ /* The submodule name, or "" for the main repo. */
+ char name[FLEX_ARRAY];
+} *ref_cache;
+
+static struct ref_entry *current_ref;
-static struct ref_list *extra_refs;
+static struct ref_array extra_refs;
-static void free_ref_list(struct ref_list *list)
+static void free_ref_array(struct ref_array *array)
{
- struct ref_list *next;
- for ( ; list; list = next) {
- next = list->next;
- free(list);
- }
+ int i;
+ for (i = 0; i < array->nr; i++)
+ free(array->refs[i]);
+ free(array->refs);
+ array->nr = array->alloc = 0;
+ array->refs = NULL;
+}
+
+static void clear_packed_ref_cache(struct ref_cache *refs)
+{
+ if (refs->did_packed)
+ free_ref_array(&refs->packed);
+ refs->did_packed = 0;
}
-static void invalidate_cached_refs(void)
+static void clear_loose_ref_cache(struct ref_cache *refs)
{
- struct cached_refs *ca = &cached_refs;
+ if (refs->did_loose)
+ free_ref_array(&refs->loose);
+ refs->did_loose = 0;
+}
- if (ca->did_loose && ca->loose)
- free_ref_list(ca->loose);
- if (ca->did_packed && ca->packed)
- free_ref_list(ca->packed);
- ca->loose = ca->packed = NULL;
- ca->did_loose = ca->did_packed = 0;
+static struct ref_cache *create_ref_cache(const char *submodule)
+{
+ int len;
+ struct ref_cache *refs;
+ if (!submodule)
+ submodule = "";
+ len = strlen(submodule) + 1;
+ refs = xcalloc(1, sizeof(struct ref_cache) + len);
+ memcpy(refs->name, submodule, len);
+ return refs;
}
-static void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
+/*
+ * Return a pointer to a ref_cache for the specified submodule. For
+ * the main repository, use submodule==NULL. The returned structure
+ * will be allocated and initialized but not necessarily populated; it
+ * should not be freed.
+ */
+static struct ref_cache *get_ref_cache(const char *submodule)
{
- struct ref_list *list = NULL;
- struct ref_list *last = NULL;
+ struct ref_cache *refs = ref_cache;
+ if (!submodule)
+ submodule = "";
+ while (refs) {
+ if (!strcmp(submodule, refs->name))
+ return refs;
+ refs = refs->next;
+ }
+
+ refs = create_ref_cache(submodule);
+ refs->next = ref_cache;
+ ref_cache = refs;
+ return refs;
+}
+
+void invalidate_ref_cache(const char *submodule)
+{
+ struct ref_cache *refs = get_ref_cache(submodule);
+ clear_packed_ref_cache(refs);
+ clear_loose_ref_cache(refs);
+}
+
+static void read_packed_refs(FILE *f, struct ref_array *array)
+{
+ struct ref_entry *last = NULL;
char refline[PATH_MAX];
int flag = REF_ISPACKED;
name = parse_ref_line(refline, sha1);
if (name) {
- list = add_ref(name, sha1, flag, list, &last);
+ add_ref(name, sha1, flag, 1, array, &last);
continue;
}
if (last &&
!get_sha1_hex(refline + 1, sha1))
hashcpy(last->peeled, sha1);
}
- cached_refs->packed = sort_ref_list(list);
+ sort_ref_array(array);
}
void add_extra_ref(const char *name, const unsigned char *sha1, int flag)
{
- extra_refs = add_ref(name, sha1, flag, extra_refs, NULL);
+ add_ref(name, sha1, flag, 0, &extra_refs, NULL);
}
void clear_extra_refs(void)
{
- free_ref_list(extra_refs);
- extra_refs = NULL;
+ free_ref_array(&extra_refs);
}
-static struct ref_list *get_packed_refs(const char *submodule)
+static struct ref_array *get_packed_refs(const char *submodule)
{
- const char *packed_refs_file;
- struct cached_refs *refs;
+ struct ref_cache *refs = get_ref_cache(submodule);
- if (submodule) {
- packed_refs_file = git_path_submodule(submodule, "packed-refs");
- refs = &submodule_refs;
- free_ref_list(refs->packed);
- } else {
- packed_refs_file = git_path("packed-refs");
- refs = &cached_refs;
- }
+ if (!refs->did_packed) {
+ const char *packed_refs_file;
+ FILE *f;
- if (!refs->did_packed || submodule) {
- FILE *f = fopen(packed_refs_file, "r");
- refs->packed = NULL;
+ if (submodule)
+ packed_refs_file = git_path_submodule(submodule, "packed-refs");
+ else
+ packed_refs_file = git_path("packed-refs");
+ f = fopen(packed_refs_file, "r");
if (f) {
- read_packed_refs(f, refs);
+ read_packed_refs(f, &refs->packed);
fclose(f);
}
refs->did_packed = 1;
}
- return refs->packed;
+ return &refs->packed;
}
-static struct ref_list *get_ref_dir(const char *submodule, const char *base,
- struct ref_list *list)
+static void get_ref_dir(const char *submodule, const char *base,
+ struct ref_array *array)
{
DIR *dir;
const char *path;
if (stat(refdir, &st) < 0)
continue;
if (S_ISDIR(st.st_mode)) {
- list = get_ref_dir(submodule, ref, list);
+ get_ref_dir(submodule, ref, array);
continue;
}
if (submodule) {
hashclr(sha1);
flag |= REF_ISBROKEN;
}
- } else
- if (!resolve_ref(ref, sha1, 1, &flag)) {
- hashclr(sha1);
- flag |= REF_ISBROKEN;
- }
- list = add_ref(ref, sha1, flag, list, NULL);
+ } else if (!resolve_ref(ref, sha1, 1, &flag)) {
+ hashclr(sha1);
+ flag |= REF_ISBROKEN;
+ }
+ add_ref(ref, sha1, flag, 1, array, NULL);
}
free(ref);
closedir(dir);
}
- return sort_ref_list(list);
}
struct warn_if_dangling_data {
for_each_rawref(warn_if_dangling_symref, &data);
}
-static struct ref_list *get_loose_refs(const char *submodule)
+static struct ref_array *get_loose_refs(const char *submodule)
{
- if (submodule) {
- free_ref_list(submodule_refs.loose);
- submodule_refs.loose = get_ref_dir(submodule, "refs", NULL);
- return submodule_refs.loose;
- }
+ struct ref_cache *refs = get_ref_cache(submodule);
- if (!cached_refs.did_loose) {
- cached_refs.loose = get_ref_dir(NULL, "refs", NULL);
- cached_refs.did_loose = 1;
+ if (!refs->did_loose) {
+ get_ref_dir(submodule, "refs", &refs->loose);
+ sort_ref_array(&refs->loose);
+ refs->did_loose = 1;
}
- return cached_refs.loose;
+ return &refs->loose;
}
/* We allow "recursive" symbolic refs. Only within reason, though */
#define MAXDEPTH 5
#define MAXREFLEN (1024)
+/*
+ * Called by resolve_gitlink_ref_recursive() after it failed to read
+ * from "name", which is "module/.git/<refname>". Find <refname> in
+ * the packed-refs file for the submodule.
+ */
static int resolve_gitlink_packed_ref(char *name, int pathlen, const char *refname, unsigned char *result)
{
- FILE *f;
- struct cached_refs refs;
- struct ref_list *ref;
- int retval;
+ int retval = -1;
+ struct ref_entry *ref;
+ struct ref_array *array;
- strcpy(name + pathlen, "packed-refs");
- f = fopen(name, "r");
- if (!f)
- return -1;
- read_packed_refs(f, &refs);
- fclose(f);
- ref = refs.packed;
- retval = -1;
- while (ref) {
- if (!strcmp(ref->name, refname)) {
- retval = 0;
- memcpy(result, ref->sha1, 20);
- break;
- }
- ref = ref->next;
+ /* being defensive: resolve_gitlink_ref() did this for us */
+ if (pathlen < 6 || memcmp(name + pathlen - 6, "/.git/", 6))
+ die("Oops");
+ name[pathlen - 6] = '\0'; /* make it path to the submodule */
+ array = get_packed_refs(name);
+ ref = search_ref_array(array, refname);
+ if (ref != NULL) {
+ memcpy(result, ref->sha1, 20);
+ retval = 0;
}
- free_ref_list(refs.packed);
return retval;
}
@@ -472,13 +488,11 @@ int resolve_gitlink_ref(const char *path, const char *refname, unsigned char *re
*/
static int get_packed_ref(const char *ref, unsigned char *sha1)
{
- struct ref_list *list = get_packed_refs(NULL);
- while (list) {
- if (!strcmp(ref, list->name)) {
- hashcpy(sha1, list->sha1);
- return 0;
- }
- list = list->next;
+ struct ref_array *packed = get_packed_refs(NULL);
+ struct ref_entry *entry = search_ref_array(packed, ref);
+ if (entry) {
+ hashcpy(sha1, entry->sha1);
+ return 0;
}
return -1;
}
@@ -489,7 +503,6 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
ssize_t len;
char buffer[256];
static char ref_buffer[256];
- char path[PATH_MAX];
if (flag)
*flag = 0;
@@ -498,6 +511,7 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
return NULL;
for (;;) {
+ char path[PATH_MAX];
struct stat st;
char *buf;
int fd;
@@ -570,21 +584,22 @@ const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *
*/
if (prefixcmp(buffer, "ref:"))
break;
+ if (flag)
+ *flag |= REF_ISSYMREF;
buf = buffer + 4;
while (isspace(*buf))
buf++;
if (check_refname_format(buf, REFNAME_ALLOW_ONELEVEL)) {
- warning("symbolic reference in %s is formatted incorrectly",
- path);
+ if (flag)
+ *flag |= REF_ISBROKEN;
return NULL;
}
ref = strcpy(ref_buffer, buf);
- if (flag)
- *flag |= REF_ISSYMREF;
}
/* Please note that FETCH_HEAD has a second line containing other data. */
if (get_sha1_hex(buffer, sha1) || (buffer[40] != '\0' && !isspace(buffer[40]))) {
- warning("reference in %s is formatted incorrectly", path);
+ if (flag)
+ *flag |= REF_ISBROKEN;
return NULL;
}
return ref;
#define DO_FOR_EACH_INCLUDE_BROKEN 01
static int do_one_ref(const char *base, each_ref_fn fn, int trim,
- int flags, void *cb_data, struct ref_list *entry)
+ int flags, void *cb_data, struct ref_entry *entry)
{
if (prefixcmp(entry->name, base))
return 0;
return -1;
if ((flag & REF_ISPACKED)) {
- struct ref_list *list = get_packed_refs(NULL);
+ struct ref_array *array = get_packed_refs(NULL);
+ struct ref_entry *r = search_ref_array(array, ref);
- while (list) {
- if (!strcmp(list->name, ref)) {
- if (list->flag & REF_KNOWS_PEELED) {
- hashcpy(sha1, list->peeled);
- return 0;
- }
- /* older pack-refs did not leave peeled ones */
- break;
- }
- list = list->next;
+ if (r != NULL && r->flag & REF_KNOWS_PEELED) {
+ hashcpy(sha1, r->peeled);
+ return 0;
}
}
static int do_for_each_ref(const char *submodule, const char *base, each_ref_fn fn,
int trim, int flags, void *cb_data)
{
- int retval = 0;
- struct ref_list *packed = get_packed_refs(submodule);
- struct ref_list *loose = get_loose_refs(submodule);
+ int retval = 0, i, p = 0, l = 0;
+ struct ref_array *packed = get_packed_refs(submodule);
+ struct ref_array *loose = get_loose_refs(submodule);
- struct ref_list *extra;
+ struct ref_array *extra = &extra_refs;
- for (extra = extra_refs; extra; extra = extra->next)
- retval = do_one_ref(base, fn, trim, flags, cb_data, extra);
+ for (i = 0; i < extra->nr; i++)
+ retval = do_one_ref(base, fn, trim, flags, cb_data, extra->refs[i]);
- while (packed && loose) {
- struct ref_list *entry;
- int cmp = strcmp(packed->name, loose->name);
+ while (p < packed->nr && l < loose->nr) {
+ struct ref_entry *entry;
+ int cmp = strcmp(packed->refs[p]->name, loose->refs[l]->name);
if (!cmp) {
- packed = packed->next;
+ p++;
continue;
}
if (cmp > 0) {
- entry = loose;
- loose = loose->next;
+ entry = loose->refs[l++];
} else {
- entry = packed;
- packed = packed->next;
+ entry = packed->refs[p++];
}
retval = do_one_ref(base, fn, trim, flags, cb_data, entry);
if (retval)
goto end_each;
}
- for (packed = packed ? packed : loose; packed; packed = packed->next) {
- retval = do_one_ref(base, fn, trim, flags, cb_data, packed);
+ if (l < loose->nr) {
+ p = l;
+ packed = loose;
+ }
+
+ for (; p < packed->nr; p++) {
+ retval = do_one_ref(base, fn, trim, flags, cb_data, packed->refs[p]);
if (retval)
goto end_each;
}
}
static int is_refname_available(const char *ref, const char *oldref,
- struct ref_list *list, int quiet)
-{
- int namlen = strlen(ref); /* e.g. 'foo/bar' */
- while (list) {
- /* list->name could be 'foo' or 'foo/bar/baz' */
- if (!oldref || strcmp(oldref, list->name)) {
- int len = strlen(list->name);
+ struct ref_array *array, int quiet)
+{
+ int i, namlen = strlen(ref); /* e.g. 'foo/bar' */
+ for (i = 0; i < array->nr; i++ ) {
+ struct ref_entry *entry = array->refs[i];
+ /* entry->name could be 'foo' or 'foo/bar/baz' */
+ if (!oldref || strcmp(oldref, entry->name)) {
+ int len = strlen(entry->name);
int cmplen = (namlen < len) ? namlen : len;
- const char *lead = (namlen < len) ? list->name : ref;
- if (!strncmp(ref, list->name, cmplen) &&
+ const char *lead = (namlen < len) ? entry->name : ref;
+ if (!strncmp(ref, entry->name, cmplen) &&
lead[cmplen] == '/') {
if (!quiet)
error("'%s' exists; cannot create '%s'",
- list->name, ref);
+ entry->name, ref);
return 0;
}
}
- list = list->next;
}
return 1;
}
*ref = xstrdup(r);
if (!warn_ambiguous_refs)
break;
- } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD"))
+ } else if ((flag & REF_ISSYMREF) && strcmp(fullref, "HEAD")) {
warning("ignoring dangling symref %s.", fullref);
+ } else if ((flag & REF_ISBROKEN) && strchr(fullref, '/')) {
+ warning("ignoring broken ref %s.", fullref);
+ }
}
free(last_branch);
return refs_found;
static int repack_without_ref(const char *refname)
{
- struct ref_list *list, *packed_ref_list;
- int fd;
- int found = 0;
+ struct ref_array *packed;
+ struct ref_entry *ref;
+ int fd, i;
- packed_ref_list = get_packed_refs(NULL);
- for (list = packed_ref_list; list; list = list->next) {
- if (!strcmp(refname, list->name)) {
- found = 1;
- break;
- }
- }
- if (!found)
+ packed = get_packed_refs(NULL);
+ ref = search_ref_array(packed, refname);
+ if (ref == NULL)
return 0;
fd = hold_lock_file_for_update(&packlock, git_path("packed-refs"), 0);
if (fd < 0) {
return error("cannot delete '%s' from packed refs", refname);
}
- for (list = packed_ref_list; list; list = list->next) {
+ for (i = 0; i < packed->nr; i++) {
char line[PATH_MAX + 100];
int len;
- if (!strcmp(refname, list->name))
+ ref = packed->refs[i];
+
+ if (!strcmp(refname, ref->name))
continue;
len = snprintf(line, sizeof(line), "%s %s\n",
- sha1_to_hex(list->sha1), list->name);
+ sha1_to_hex(ref->sha1), ref->name);
/* this should not happen but just being defensive */
if (len > sizeof(line))
- die("too long a refname '%s'", list->name);
+ die("too long a refname '%s'", ref->name);
write_or_die(fd, line, len);
}
return commit_lock_file(&packlock);
ret |= repack_without_ref(refname);
unlink_or_warn(git_path("logs/%s", lock->ref_name));
- invalidate_cached_refs();
+ invalidate_ref_cache(NULL);
unlock_ref(lock);
return ret;
}
int rename_ref(const char *oldref, const char *newref, const char *logmsg)
{
- static const char renamed_ref[] = "RENAMED-REF";
unsigned char sha1[20], orig_sha1[20];
int flag = 0, logmoved = 0;
struct ref_lock *lock;
if (!is_refname_available(newref, oldref, get_loose_refs(NULL), 0))
return 1;
- lock = lock_ref_sha1_basic(renamed_ref, NULL, 0, NULL);
- if (!lock)
- return error("unable to lock %s", renamed_ref);
- lock->force_write = 1;
- if (write_ref_sha1(lock, orig_sha1, logmsg))
- return error("unable to save current sha1 in %s", renamed_ref);
-
if (log && rename(git_path("logs/%s", oldref), git_path(TMP_RENAMED_LOG)))
return error("unable to move logfile logs/%s to "TMP_RENAMED_LOG": %s",
oldref, strerror(errno));
unlock_ref(lock);
return -1;
}
- invalidate_cached_refs();
+ clear_loose_ref_cache(get_ref_cache(NULL));
if (log_ref_write(lock->ref_name, lock->old_sha1, sha1, logmsg) < 0 ||
(strcmp(lock->ref_name, lock->orig_ref_name) &&
log_ref_write(lock->orig_ref_name, lock->old_sha1, sha1, logmsg) < 0)) {
return 0;
}
-int ref_exists(char *refname)
+int ref_exists(const char *refname)
{
unsigned char sha1[20];
return !!resolve_ref(refname, sha1, 1, NULL);