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-rw-r--r--refs.c361
1 files changed, 260 insertions, 101 deletions
diff --git a/refs.c b/refs.c
index 5e653141c..40f16af18 100644
--- a/refs.c
+++ b/refs.c
@@ -3,15 +3,165 @@
#include <errno.h>
+struct ref_list {
+ struct ref_list *next;
+ unsigned char flag; /* ISSYMREF? ISPACKED? */
+ unsigned char sha1[20];
+ char name[FLEX_ARRAY];
+};
+
+static const char *parse_ref_line(char *line, unsigned char *sha1)
+{
+ /*
+ * 42: the answer to everything.
+ *
+ * In this case, it happens to be the answer to
+ * 40 (length of sha1 hex representation)
+ * +1 (space in between hex and name)
+ * +1 (newline at the end of the line)
+ */
+ int len = strlen(line) - 42;
+
+ if (len <= 0)
+ return NULL;
+ if (get_sha1_hex(line, sha1) < 0)
+ return NULL;
+ if (!isspace(line[40]))
+ return NULL;
+ line += 41;
+ if (isspace(*line))
+ return NULL;
+ if (line[len] != '\n')
+ return NULL;
+ line[len] = 0;
+ return line;
+}
+
+static struct ref_list *add_ref(const char *name, const unsigned char *sha1,
+ int flag, struct ref_list *list)
+{
+ int len;
+ struct ref_list **p = &list, *entry;
+
+ /* Find the place to insert the ref into.. */
+ while ((entry = *p) != NULL) {
+ int cmp = strcmp(entry->name, name);
+ if (cmp > 0)
+ break;
+
+ /* Same as existing entry? */
+ if (!cmp)
+ return list;
+ p = &entry->next;
+ }
+
+ /* Allocate it and add it in.. */
+ len = strlen(name) + 1;
+ entry = xmalloc(sizeof(struct ref_list) + len);
+ hashcpy(entry->sha1, sha1);
+ memcpy(entry->name, name, len);
+ entry->flag = flag;
+ entry->next = *p;
+ *p = entry;
+ return list;
+}
+
+static struct ref_list *get_packed_refs(void)
+{
+ static int did_refs = 0;
+ static struct ref_list *refs = NULL;
+
+ if (!did_refs) {
+ FILE *f = fopen(git_path("packed-refs"), "r");
+ if (f) {
+ struct ref_list *list = NULL;
+ char refline[PATH_MAX];
+ while (fgets(refline, sizeof(refline), f)) {
+ unsigned char sha1[20];
+ const char *name = parse_ref_line(refline, sha1);
+ if (!name)
+ continue;
+ list = add_ref(name, sha1, REF_ISPACKED, list);
+ }
+ fclose(f);
+ refs = list;
+ }
+ did_refs = 1;
+ }
+ return refs;
+}
+
+static struct ref_list *get_ref_dir(const char *base, struct ref_list *list)
+{
+ DIR *dir = opendir(git_path("%s", base));
+
+ if (dir) {
+ struct dirent *de;
+ int baselen = strlen(base);
+ char *ref = xmalloc(baselen + 257);
+
+ memcpy(ref, base, baselen);
+ if (baselen && base[baselen-1] != '/')
+ ref[baselen++] = '/';
+
+ while ((de = readdir(dir)) != NULL) {
+ unsigned char sha1[20];
+ struct stat st;
+ int flag;
+ int namelen;
+
+ if (de->d_name[0] == '.')
+ continue;
+ namelen = strlen(de->d_name);
+ if (namelen > 255)
+ continue;
+ if (has_extension(de->d_name, ".lock"))
+ continue;
+ memcpy(ref + baselen, de->d_name, namelen+1);
+ if (stat(git_path("%s", ref), &st) < 0)
+ continue;
+ if (S_ISDIR(st.st_mode)) {
+ list = get_ref_dir(ref, list);
+ continue;
+ }
+ if (!resolve_ref(ref, sha1, 1, &flag)) {
+ error("%s points nowhere!", ref);
+ continue;
+ }
+ list = add_ref(ref, sha1, flag, list);
+ }
+ free(ref);
+ closedir(dir);
+ }
+ return list;
+}
+
+static struct ref_list *get_loose_refs(void)
+{
+ static int did_refs = 0;
+ static struct ref_list *refs = NULL;
+
+ if (!did_refs) {
+ refs = get_ref_dir("refs", NULL);
+ did_refs = 1;
+ }
+ return refs;
+}
+
/* We allow "recursive" symbolic refs. Only within reason, though */
#define MAXDEPTH 5
-const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
+const char *resolve_ref(const char *ref, unsigned char *sha1, int reading, int *flag)
{
int depth = MAXDEPTH, len;
char buffer[256];
+ static char ref_buffer[256];
+
+ if (flag)
+ *flag = 0;
for (;;) {
+ const char *path = git_path("%s", ref);
struct stat st;
char *buf;
int fd;
@@ -27,17 +177,31 @@ const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
* reading.
*/
if (lstat(path, &st) < 0) {
+ struct ref_list *list = get_packed_refs();
+ while (list) {
+ if (!strcmp(ref, list->name)) {
+ hashcpy(sha1, list->sha1);
+ if (flag)
+ *flag |= REF_ISPACKED;
+ return ref;
+ }
+ list = list->next;
+ }
if (reading || errno != ENOENT)
return NULL;
hashclr(sha1);
- return path;
+ return ref;
}
/* Follow "normalized" - ie "refs/.." symlinks by hand */
if (S_ISLNK(st.st_mode)) {
len = readlink(path, buffer, sizeof(buffer)-1);
if (len >= 5 && !memcmp("refs/", buffer, 5)) {
- path = git_path("%.*s", len, buffer);
+ buffer[len] = 0;
+ strcpy(ref_buffer, buffer);
+ ref = ref_buffer;
+ if (flag)
+ *flag |= REF_ISSYMREF;
continue;
}
}
@@ -62,19 +226,24 @@ const char *resolve_ref(const char *path, unsigned char *sha1, int reading)
while (len && isspace(*buf))
buf++, len--;
while (len && isspace(buf[len-1]))
- buf[--len] = 0;
- path = git_path("%.*s", len, buf);
+ len--;
+ buf[len] = 0;
+ memcpy(ref_buffer, buf, len + 1);
+ ref = ref_buffer;
+ if (flag)
+ *flag |= REF_ISSYMREF;
}
if (len < 40 || get_sha1_hex(buffer, sha1))
return NULL;
- return path;
+ return ref;
}
-int create_symref(const char *git_HEAD, const char *refs_heads_master)
+int create_symref(const char *ref_target, const char *refs_heads_master)
{
const char *lockpath;
char ref[1000];
int fd, len, written;
+ const char *git_HEAD = git_path("%s", ref_target);
#ifndef NO_SYMLINK_HEAD
if (prefer_symlink_refs) {
@@ -112,104 +281,101 @@ int create_symref(const char *git_HEAD, const char *refs_heads_master)
return 0;
}
-int read_ref(const char *filename, unsigned char *sha1)
+int read_ref(const char *ref, unsigned char *sha1)
{
- if (resolve_ref(filename, sha1, 1))
+ if (resolve_ref(ref, sha1, 1, NULL))
return 0;
return -1;
}
-static int do_for_each_ref(const char *base, int (*fn)(const char *path, const unsigned char *sha1), int trim)
+static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
+ void *cb_data)
{
- int retval = 0;
- DIR *dir = opendir(git_path("%s", base));
-
- if (dir) {
- struct dirent *de;
- int baselen = strlen(base);
- char *path = xmalloc(baselen + 257);
-
- if (!strncmp(base, "./", 2)) {
- base += 2;
- baselen -= 2;
+ int retval;
+ struct ref_list *packed = get_packed_refs();
+ struct ref_list *loose = get_loose_refs();
+
+ while (packed && loose) {
+ struct ref_list *entry;
+ int cmp = strcmp(packed->name, loose->name);
+ if (!cmp) {
+ packed = packed->next;
+ continue;
}
- memcpy(path, base, baselen);
- if (baselen && base[baselen-1] != '/')
- path[baselen++] = '/';
-
- while ((de = readdir(dir)) != NULL) {
- unsigned char sha1[20];
- struct stat st;
- int namelen;
+ if (cmp > 0) {
+ entry = loose;
+ loose = loose->next;
+ } else {
+ entry = packed;
+ packed = packed->next;
+ }
+ if (strncmp(base, entry->name, trim))
+ continue;
+ if (is_null_sha1(entry->sha1))
+ continue;
+ if (!has_sha1_file(entry->sha1)) {
+ error("%s does not point to a valid object!", entry->name);
+ continue;
+ }
+ retval = fn(entry->name + trim, entry->sha1,
+ entry->flag, cb_data);
+ if (retval)
+ return retval;
+ }
- if (de->d_name[0] == '.')
- continue;
- namelen = strlen(de->d_name);
- if (namelen > 255)
- continue;
- if (has_extension(de->d_name, ".lock"))
- continue;
- memcpy(path + baselen, de->d_name, namelen+1);
- if (stat(git_path("%s", path), &st) < 0)
- continue;
- if (S_ISDIR(st.st_mode)) {
- retval = do_for_each_ref(path, fn, trim);
- if (retval)
- break;
- continue;
- }
- if (read_ref(git_path("%s", path), sha1) < 0) {
- error("%s points nowhere!", path);
- continue;
- }
- if (!has_sha1_file(sha1)) {
- error("%s does not point to a valid "
- "commit object!", path);
- continue;
- }
- retval = fn(path + trim, sha1);
+ packed = packed ? packed : loose;
+ while (packed) {
+ if (!strncmp(base, packed->name, trim)) {
+ retval = fn(packed->name + trim, packed->sha1,
+ packed->flag, cb_data);
if (retval)
- break;
+ return retval;
}
- free(path);
- closedir(dir);
+ packed = packed->next;
}
- return retval;
+ return 0;
}
-int head_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int head_ref(each_ref_fn fn, void *cb_data)
{
unsigned char sha1[20];
- if (!read_ref(git_path("HEAD"), sha1))
- return fn("HEAD", sha1);
+ int flag;
+
+ if (resolve_ref("HEAD", sha1, 1, &flag))
+ return fn("HEAD", sha1, flag, cb_data);
return 0;
}
-int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int for_each_ref(each_ref_fn fn, void *cb_data)
{
- return do_for_each_ref("refs", fn, 0);
+ return do_for_each_ref("refs/", fn, 0, cb_data);
}
-int for_each_tag_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
- return do_for_each_ref("refs/tags", fn, 10);
+ return do_for_each_ref("refs/tags/", fn, 10, cb_data);
}
-int for_each_branch_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
- return do_for_each_ref("refs/heads", fn, 11);
+ return do_for_each_ref("refs/heads/", fn, 11, cb_data);
}
-int for_each_remote_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
{
- return do_for_each_ref("refs/remotes", fn, 13);
+ return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
}
+/* NEEDSWORK: This is only used by ssh-upload and it should go; the
+ * caller should do resolve_ref or read_ref like everybody else. Or
+ * maybe everybody else should use get_ref_sha1() instead of doing
+ * read_ref().
+ */
int get_ref_sha1(const char *ref, unsigned char *sha1)
{
if (check_ref_format(ref))
return -1;
- return read_ref(git_path("refs/%s", ref), sha1);
+ return read_ref(mkpath("refs/%s", ref), sha1);
}
/*
@@ -267,22 +433,13 @@ int check_ref_format(const char *ref)
static struct ref_lock *verify_lock(struct ref_lock *lock,
const unsigned char *old_sha1, int mustexist)
{
- char buf[40];
- int nr, fd = open(lock->ref_file, O_RDONLY);
- if (fd < 0 && (mustexist || errno != ENOENT)) {
- error("Can't verify ref %s", lock->ref_file);
- unlock_ref(lock);
- return NULL;
- }
- nr = read(fd, buf, 40);
- close(fd);
- if (nr != 40 || get_sha1_hex(buf, lock->old_sha1) < 0) {
- error("Can't verify ref %s", lock->ref_file);
+ if (!resolve_ref(lock->ref_name, lock->old_sha1, mustexist, NULL)) {
+ error("Can't verify ref %s", lock->ref_name);
unlock_ref(lock);
return NULL;
}
if (hashcmp(lock->old_sha1, old_sha1)) {
- error("Ref %s is at %s but expected %s", lock->ref_file,
+ error("Ref %s is at %s but expected %s", lock->ref_name,
sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
unlock_ref(lock);
return NULL;
@@ -290,36 +447,37 @@ static struct ref_lock *verify_lock(struct ref_lock *lock,
return lock;
}
-static struct ref_lock *lock_ref_sha1_basic(const char *path,
+static struct ref_lock *lock_ref_sha1_basic(const char *ref,
int plen,
const unsigned char *old_sha1, int mustexist)
{
- const char *orig_path = path;
+ char *ref_file;
+ const char *orig_ref = ref;
struct ref_lock *lock;
struct stat st;
lock = xcalloc(1, sizeof(struct ref_lock));
lock->lock_fd = -1;
- plen = strlen(path) - plen;
- path = resolve_ref(path, lock->old_sha1, mustexist);
- if (!path) {
+ ref = resolve_ref(ref, lock->old_sha1, mustexist, NULL);
+ if (!ref) {
int last_errno = errno;
error("unable to resolve reference %s: %s",
- orig_path, strerror(errno));
+ orig_ref, strerror(errno));
unlock_ref(lock);
errno = last_errno;
return NULL;
}
lock->lk = xcalloc(1, sizeof(struct lock_file));
- lock->ref_file = xstrdup(path);
- lock->log_file = xstrdup(git_path("logs/%s", lock->ref_file + plen));
- lock->force_write = lstat(lock->ref_file, &st) && errno == ENOENT;
+ lock->ref_name = xstrdup(ref);
+ lock->log_file = xstrdup(git_path("logs/%s", ref));
+ ref_file = git_path(ref);
+ lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
- if (safe_create_leading_directories(lock->ref_file))
- die("unable to create directory for %s", lock->ref_file);
- lock->lock_fd = hold_lock_file_for_update(lock->lk, lock->ref_file, 1);
+ if (safe_create_leading_directories(ref_file))
+ die("unable to create directory for %s", ref_file);
+ lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
}
@@ -327,17 +485,18 @@ static struct ref_lock *lock_ref_sha1_basic(const char *path,
struct ref_lock *lock_ref_sha1(const char *ref,
const unsigned char *old_sha1, int mustexist)
{
+ char refpath[PATH_MAX];
if (check_ref_format(ref))
return NULL;
- return lock_ref_sha1_basic(git_path("refs/%s", ref),
- 5 + strlen(ref), old_sha1, mustexist);
+ strcpy(refpath, mkpath("refs/%s", ref));
+ return lock_ref_sha1_basic(refpath, strlen(refpath),
+ old_sha1, mustexist);
}
struct ref_lock *lock_any_ref_for_update(const char *ref,
const unsigned char *old_sha1, int mustexist)
{
- return lock_ref_sha1_basic(git_path("%s", ref),
- strlen(ref), old_sha1, mustexist);
+ return lock_ref_sha1_basic(ref, strlen(ref), old_sha1, mustexist);
}
void unlock_ref(struct ref_lock *lock)
@@ -348,7 +507,7 @@ void unlock_ref(struct ref_lock *lock)
if (lock->lk)
rollback_lock_file(lock->lk);
}
- free(lock->ref_file);
+ free(lock->ref_name);
free(lock->log_file);
free(lock);
}
@@ -425,7 +584,7 @@ int write_ref_sha1(struct ref_lock *lock,
return -1;
}
if (commit_lock_file(lock->lk)) {
- error("Couldn't set %s", lock->ref_file);
+ error("Couldn't set %s", lock->ref_name);
unlock_ref(lock);
return -1;
}
generated by cgit v1.2.1 (git 2.18.0) at 2024-10-03 11:02:42 +0000