#include "refs.h"
#include "cache.h"
+#include "object.h"
+#include "tag.h"
#include <errno.h>
+/* ISSYMREF=01 and ISPACKED=02 are public interfaces */
+#define REF_KNOWS_PEELED 04
+
+struct ref_list {
+ struct ref_list *next;
+ unsigned char flag; /* ISSYMREF? ISPACKED? */
+ unsigned char sha1[20];
+ unsigned char peeled[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,
+ struct ref_list **new_entry)
+{
+ 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) {
+ if (new_entry)
+ *new_entry = entry;
+ 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);
+ hashclr(entry->peeled);
+ memcpy(entry->name, name, len);
+ entry->flag = flag;
+ entry->next = *p;
+ *p = entry;
+ if (new_entry)
+ *new_entry = entry;
+ return list;
+}
+
+/*
+ * Future: need to be in "struct repository"
+ * when doing a full libification.
+ */
+struct cached_refs {
+ char did_loose;
+ char did_packed;
+ struct ref_list *loose;
+ struct ref_list *packed;
+} cached_refs;
+
+static void free_ref_list(struct ref_list *list)
+{
+ struct ref_list *next;
+ for ( ; list; list = next) {
+ next = list->next;
+ free(list);
+ }
+}
+
+static void invalidate_cached_refs(void)
+{
+ struct cached_refs *ca = &cached_refs;
+
+ 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 void read_packed_refs(FILE *f, struct cached_refs *cached_refs)
+{
+ struct ref_list *list = NULL;
+ struct ref_list *last = NULL;
+ char refline[PATH_MAX];
+ int flag = REF_ISPACKED;
+
+ while (fgets(refline, sizeof(refline), f)) {
+ unsigned char sha1[20];
+ const char *name;
+ static const char header[] = "# pack-refs with:";
+
+ if (!strncmp(refline, header, sizeof(header)-1)) {
+ const char *traits = refline + sizeof(header) - 1;
+ if (strstr(traits, " peeled "))
+ flag |= REF_KNOWS_PEELED;
+ /* perhaps other traits later as well */
+ continue;
+ }
+
+ name = parse_ref_line(refline, sha1);
+ if (name) {
+ list = add_ref(name, sha1, flag, list, &last);
+ continue;
+ }
+ if (last &&
+ refline[0] == '^' &&
+ strlen(refline) == 42 &&
+ refline[41] == '\n' &&
+ !get_sha1_hex(refline + 1, sha1))
+ hashcpy(last->peeled, sha1);
+ }
+ cached_refs->packed = list;
+}
+
+static struct ref_list *get_packed_refs(void)
+{
+ if (!cached_refs.did_packed) {
+ FILE *f = fopen(git_path("packed-refs"), "r");
+ cached_refs.packed = NULL;
+ if (f) {
+ read_packed_refs(f, &cached_refs);
+ fclose(f);
+ }
+ cached_refs.did_packed = 1;
+ }
+ return cached_refs.packed;
+}
+
+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, NULL);
+ }
+ free(ref);
+ closedir(dir);
+ }
+ return list;
+}
+
+static struct ref_list *get_loose_refs(void)
+{
+ if (!cached_refs.did_loose) {
+ cached_refs.loose = get_ref_dir("refs", NULL);
+ cached_refs.did_loose = 1;
+ }
+ return cached_refs.loose;
+}
+
/* We allow "recursive" symbolic refs. Only within reason, though */
#define MAXDEPTH 5
-#ifndef USE_SYMLINK_HEAD
-#define USE_SYMLINK_HEAD 1
-#endif
-
-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;
* 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;
- memset(sha1, 0, 20);
- return path;
+ hashclr(sha1);
+ 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;
}
}
+ /* Is it a directory? */
+ if (S_ISDIR(st.st_mode)) {
+ errno = EISDIR;
+ return NULL;
+ }
+
/*
* Anything else, just open it and try to use it as
* a ref
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);
-#if USE_SYMLINK_HEAD
- if (!only_use_symrefs) {
+#ifndef NO_SYMLINK_HEAD
+ if (prefer_symlink_refs) {
unlink(git_HEAD);
if (!symlink(refs_heads_master, git_HEAD))
return 0;
error("Unable to create %s", git_HEAD);
return -3;
}
+ if (adjust_shared_perm(git_HEAD)) {
+ unlink(lockpath);
+ error("Unable to fix permissions on %s", lockpath);
+ return -4;
+ }
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))
+static int do_one_ref(const char *base, each_ref_fn fn, int trim,
+ void *cb_data, struct ref_list *entry)
{
- int retval = 0;
- DIR *dir = opendir(git_path("%s", base));
+ if (strncmp(base, entry->name, trim))
+ return 0;
+ if (is_null_sha1(entry->sha1))
+ return 0;
+ if (!has_sha1_file(entry->sha1)) {
+ error("%s does not point to a valid object!", entry->name);
+ return 0;
+ }
+ return fn(entry->name + trim, entry->sha1, entry->flag, cb_data);
+}
- if (dir) {
- struct dirent *de;
- int baselen = strlen(base);
- char *path = xmalloc(baselen + 257);
+int peel_ref(const char *ref, unsigned char *sha1)
+{
+ int flag;
+ unsigned char base[20];
+ struct object *o;
- if (!strncmp(base, "./", 2)) {
- base += 2;
- baselen -= 2;
- }
- memcpy(path, base, baselen);
- if (baselen && base[baselen-1] != '/')
- path[baselen++] = '/';
+ if (!resolve_ref(ref, base, 1, &flag))
+ return -1;
- while ((de = readdir(dir)) != NULL) {
- unsigned char sha1[20];
- struct stat st;
- int namelen;
+ if ((flag & REF_ISPACKED)) {
+ struct ref_list *list = get_packed_refs();
- if (de->d_name[0] == '.')
- continue;
- namelen = strlen(de->d_name);
- if (namelen > 255)
- 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);
- if (retval)
- break;
- continue;
- }
- if (read_ref(git_path("%s", path), sha1) < 0)
- continue;
- if (!has_sha1_file(sha1))
- continue;
- retval = fn(path, sha1);
- if (retval)
+ 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;
+ }
+ }
+
+ /* fallback - callers should not call this for unpacked refs */
+ o = parse_object(base);
+ if (o->type == OBJ_TAG) {
+ o = deref_tag(o, ref, 0);
+ if (o) {
+ hashcpy(sha1, o->sha1);
+ return 0;
}
- free(path);
- closedir(dir);
}
- return retval;
+ return -1;
}
-int head_ref(int (*fn)(const char *path, const unsigned char *sha1))
+static int do_for_each_ref(const char *base, each_ref_fn fn, int trim,
+ void *cb_data)
{
- unsigned char sha1[20];
- if (!read_ref(git_path("HEAD"), sha1))
- return fn("HEAD", sha1);
+ 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;
+ }
+ if (cmp > 0) {
+ entry = loose;
+ loose = loose->next;
+ } else {
+ entry = packed;
+ packed = packed->next;
+ }
+ retval = do_one_ref(base, fn, trim, cb_data, entry);
+ if (retval)
+ return retval;
+ }
+
+ for (packed = packed ? packed : loose; packed; packed = packed->next) {
+ retval = do_one_ref(base, fn, trim, cb_data, packed);
+ if (retval)
+ return retval;
+ }
return 0;
}
-int for_each_ref(int (*fn)(const char *path, const unsigned char *sha1))
+int head_ref(each_ref_fn fn, void *cb_data)
{
- return do_for_each_ref("refs", fn);
-}
+ unsigned char sha1[20];
+ int flag;
-static char *ref_file_name(const char *ref)
-{
- char *base = get_refs_directory();
- int baselen = strlen(base);
- int reflen = strlen(ref);
- char *ret = xmalloc(baselen + 2 + reflen);
- sprintf(ret, "%s/%s", base, ref);
- return ret;
+ if (resolve_ref("HEAD", sha1, 1, &flag))
+ return fn("HEAD", sha1, flag, cb_data);
+ return 0;
}
-static char *ref_lock_file_name(const char *ref)
+int for_each_ref(each_ref_fn fn, void *cb_data)
{
- char *base = get_refs_directory();
- int baselen = strlen(base);
- int reflen = strlen(ref);
- char *ret = xmalloc(baselen + 7 + reflen);
- sprintf(ret, "%s/%s.lock", base, ref);
- return ret;
+ return do_for_each_ref("refs/", fn, 0, cb_data);
}
-int get_ref_sha1(const char *ref, unsigned char *sha1)
+int for_each_tag_ref(each_ref_fn fn, void *cb_data)
{
- const char *filename;
-
- if (check_ref_format(ref))
- return -1;
- filename = git_path("refs/%s", ref);
- return read_ref(filename, sha1);
+ return do_for_each_ref("refs/tags/", fn, 10, cb_data);
}
-static int lock_ref_file(const char *filename, const char *lock_filename,
- const unsigned char *old_sha1)
+int for_each_branch_ref(each_ref_fn fn, void *cb_data)
{
- int fd = open(lock_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
- unsigned char current_sha1[20];
- int retval;
- if (fd < 0) {
- return error("Couldn't open lock file for %s: %s",
- filename, strerror(errno));
- }
- retval = read_ref(filename, current_sha1);
- if (old_sha1) {
- if (retval) {
- close(fd);
- unlink(lock_filename);
- return error("Could not read the current value of %s",
- filename);
- }
- if (memcmp(current_sha1, old_sha1, 20)) {
- close(fd);
- unlink(lock_filename);
- error("The current value of %s is %s",
- filename, sha1_to_hex(current_sha1));
- return error("Expected %s",
- sha1_to_hex(old_sha1));
- }
- } else {
- if (!retval) {
- close(fd);
- unlink(lock_filename);
- return error("Unexpectedly found a value of %s for %s",
- sha1_to_hex(current_sha1), filename);
- }
- }
- return fd;
+ return do_for_each_ref("refs/heads/", fn, 11, cb_data);
}
-int lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
+int for_each_remote_ref(each_ref_fn fn, void *cb_data)
{
- char *filename;
- char *lock_filename;
- int retval;
- if (check_ref_format(ref))
- return -1;
- filename = ref_file_name(ref);
- lock_filename = ref_lock_file_name(ref);
- retval = lock_ref_file(filename, lock_filename, old_sha1);
- free(filename);
- free(lock_filename);
- return retval;
-}
-
-static int write_ref_file(const char *filename,
- const char *lock_filename, int fd,
- const unsigned char *sha1)
-{
- char *hex = sha1_to_hex(sha1);
- char term = '\n';
- if (write(fd, hex, 40) < 40 ||
- write(fd, &term, 1) < 1) {
- error("Couldn't write %s\n", filename);
- close(fd);
- return -1;
- }
- close(fd);
- rename(lock_filename, filename);
- return 0;
+ return do_for_each_ref("refs/remotes/", fn, 13, cb_data);
}
-int write_ref_sha1(const char *ref, int fd, const unsigned char *sha1)
+/* 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)
{
- char *filename;
- char *lock_filename;
- int retval;
- if (fd < 0)
- return -1;
if (check_ref_format(ref))
return -1;
- filename = ref_file_name(ref);
- lock_filename = ref_lock_file_name(ref);
- if (safe_create_leading_directories(filename))
- die("unable to create leading directory for %s", filename);
- retval = write_ref_file(filename, lock_filename, fd, sha1);
- free(filename);
- free(lock_filename);
- return retval;
+ return read_ref(mkpath("refs/%s", ref), sha1);
}
/*
static inline int bad_ref_char(int ch)
{
return (((unsigned) ch) <= ' ' ||
- ch == '~' || ch == '^' || ch == ':');
+ ch == '~' || ch == '^' || ch == ':' ||
+ /* 2.13 Pattern Matching Notation */
+ ch == '?' || ch == '*' || ch == '[');
}
int check_ref_format(const char *ref)
}
}
-int write_ref_sha1_unlocked(const char *ref, const unsigned char *sha1)
+static struct ref_lock *verify_lock(struct ref_lock *lock,
+ const unsigned char *old_sha1, int mustexist)
{
- char *filename;
- char *lock_filename;
- int fd;
- int retval;
+ 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_name,
+ sha1_to_hex(lock->old_sha1), sha1_to_hex(old_sha1));
+ unlock_ref(lock);
+ return NULL;
+ }
+ return lock;
+}
+
+static int remove_empty_dir_recursive(char *path, int len)
+{
+ DIR *dir = opendir(path);
+ struct dirent *e;
+ int ret = 0;
+
+ if (!dir)
+ return -1;
+ if (path[len-1] != '/')
+ path[len++] = '/';
+ while ((e = readdir(dir)) != NULL) {
+ struct stat st;
+ int namlen;
+ if ((e->d_name[0] == '.') &&
+ ((e->d_name[1] == 0) ||
+ ((e->d_name[1] == '.') && e->d_name[2] == 0)))
+ continue; /* "." and ".." */
+
+ namlen = strlen(e->d_name);
+ if ((len + namlen < PATH_MAX) &&
+ strcpy(path + len, e->d_name) &&
+ !lstat(path, &st) &&
+ S_ISDIR(st.st_mode) &&
+ !remove_empty_dir_recursive(path, len + namlen))
+ continue; /* happy */
+
+ /* path too long, stat fails, or non-directory still exists */
+ ret = -1;
+ break;
+ }
+ closedir(dir);
+ if (!ret) {
+ path[len] = 0;
+ ret = rmdir(path);
+ }
+ return ret;
+}
+
+static int remove_empty_directories(char *file)
+{
+ /* we want to create a file but there is a directory there;
+ * if that is an empty directory (or a directory that contains
+ * only empty directories), remove them.
+ */
+ char path[PATH_MAX];
+ int len = strlen(file);
+
+ if (len >= PATH_MAX) /* path too long ;-) */
+ return -1;
+ strcpy(path, file);
+ return remove_empty_dir_recursive(path, len);
+}
+
+static struct ref_lock *lock_ref_sha1_basic(const char *ref, const unsigned char *old_sha1, int *flag)
+{
+ char *ref_file;
+ const char *orig_ref = ref;
+ struct ref_lock *lock;
+ struct stat st;
+ int last_errno = 0;
+ int mustexist = (old_sha1 && !is_null_sha1(old_sha1));
+
+ lock = xcalloc(1, sizeof(struct ref_lock));
+ lock->lock_fd = -1;
+
+ ref = resolve_ref(ref, lock->old_sha1, mustexist, flag);
+ if (!ref && errno == EISDIR) {
+ /* we are trying to lock foo but we used to
+ * have foo/bar which now does not exist;
+ * it is normal for the empty directory 'foo'
+ * to remain.
+ */
+ ref_file = git_path("%s", orig_ref);
+ if (remove_empty_directories(ref_file)) {
+ last_errno = errno;
+ error("there are still refs under '%s'", orig_ref);
+ goto error_return;
+ }
+ ref = resolve_ref(orig_ref, lock->old_sha1, mustexist, flag);
+ }
+ if (!ref) {
+ last_errno = errno;
+ error("unable to resolve reference %s: %s",
+ orig_ref, strerror(errno));
+ goto error_return;
+ }
+ if (is_null_sha1(lock->old_sha1)) {
+ /* The ref did not exist and we are creating it.
+ * Make sure there is no existing ref that is packed
+ * whose name begins with our refname, nor a ref whose
+ * name is a proper prefix of our refname.
+ */
+ int namlen = strlen(ref); /* e.g. 'foo/bar' */
+ struct ref_list *list = get_packed_refs();
+ while (list) {
+ /* list->name could be 'foo' or 'foo/bar/baz' */
+ int len = strlen(list->name);
+ int cmplen = (namlen < len) ? namlen : len;
+ const char *lead = (namlen < len) ? list->name : ref;
+
+ if (!strncmp(ref, list->name, cmplen) &&
+ lead[cmplen] == '/') {
+ error("'%s' exists; cannot create '%s'",
+ list->name, ref);
+ goto error_return;
+ }
+ list = list->next;
+ }
+ }
+
+ lock->lk = xcalloc(1, sizeof(struct lock_file));
+
+ lock->ref_name = xstrdup(ref);
+ lock->log_file = xstrdup(git_path("logs/%s", ref));
+ ref_file = git_path("%s", ref);
+ lock->force_write = lstat(ref_file, &st) && errno == ENOENT;
+
+ if (safe_create_leading_directories(ref_file)) {
+ last_errno = errno;
+ error("unable to create directory for %s", ref_file);
+ goto error_return;
+ }
+ lock->lock_fd = hold_lock_file_for_update(lock->lk, ref_file, 1);
+
+ return old_sha1 ? verify_lock(lock, old_sha1, mustexist) : lock;
+
+ error_return:
+ unlock_ref(lock);
+ errno = last_errno;
+ return NULL;
+}
+
+struct ref_lock *lock_ref_sha1(const char *ref, const unsigned char *old_sha1)
+{
+ char refpath[PATH_MAX];
if (check_ref_format(ref))
+ return NULL;
+ strcpy(refpath, mkpath("refs/%s", ref));
+ return lock_ref_sha1_basic(refpath, old_sha1, NULL);
+}
+
+struct ref_lock *lock_any_ref_for_update(const char *ref, const unsigned char *old_sha1)
+{
+ return lock_ref_sha1_basic(ref, old_sha1, NULL);
+}
+
+static struct lock_file packlock;
+
+static int repack_without_ref(const char *refname)
+{
+ struct ref_list *list, *packed_ref_list;
+ int fd;
+ int found = 0;
+
+ packed_ref_list = get_packed_refs();
+ for (list = packed_ref_list; list; list = list->next) {
+ if (!strcmp(refname, list->name)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ return 0;
+ memset(&packlock, 0, sizeof(packlock));
+ 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) {
+ char line[PATH_MAX + 100];
+ int len;
+
+ if (!strcmp(refname, list->name))
+ continue;
+ len = snprintf(line, sizeof(line), "%s %s\n",
+ sha1_to_hex(list->sha1), list->name);
+ /* this should not happen but just being defensive */
+ if (len > sizeof(line))
+ die("too long a refname '%s'", list->name);
+ write_or_die(fd, line, len);
+ }
+ return commit_lock_file(&packlock);
+}
+
+int delete_ref(const char *refname, unsigned char *sha1)
+{
+ struct ref_lock *lock;
+ int err, i, ret = 0, flag = 0;
+
+ lock = lock_ref_sha1_basic(refname, sha1, &flag);
+ if (!lock)
+ return 1;
+ if (!(flag & REF_ISPACKED)) {
+ /* loose */
+ i = strlen(lock->lk->filename) - 5; /* .lock */
+ lock->lk->filename[i] = 0;
+ err = unlink(lock->lk->filename);
+ if (err) {
+ ret = 1;
+ error("unlink(%s) failed: %s",
+ lock->lk->filename, strerror(errno));
+ }
+ lock->lk->filename[i] = '.';
+ }
+ /* removing the loose one could have resurrected an earlier
+ * packed one. Also, if it was not loose we need to repack
+ * without it.
+ */
+ ret |= repack_without_ref(refname);
+
+ err = unlink(lock->log_file);
+ if (err && errno != ENOENT)
+ fprintf(stderr, "warning: unlink(%s) failed: %s",
+ lock->log_file, strerror(errno));
+ invalidate_cached_refs();
+ unlock_ref(lock);
+ return ret;
+}
+
+void unlock_ref(struct ref_lock *lock)
+{
+ if (lock->lock_fd >= 0) {
+ close(lock->lock_fd);
+ /* Do not free lock->lk -- atexit() still looks at them */
+ if (lock->lk)
+ rollback_lock_file(lock->lk);
+ }
+ free(lock->ref_name);
+ free(lock->log_file);
+ free(lock);
+}
+
+static int log_ref_write(struct ref_lock *lock,
+ const unsigned char *sha1, const char *msg)
+{
+ int logfd, written, oflags = O_APPEND | O_WRONLY;
+ unsigned maxlen, len;
+ char *logrec;
+ const char *committer;
+
+ if (log_all_ref_updates &&
+ !strncmp(lock->ref_name, "refs/heads/", 11)) {
+ if (safe_create_leading_directories(lock->log_file) < 0)
+ return error("unable to create directory for %s",
+ lock->log_file);
+ oflags |= O_CREAT;
+ }
+
+ logfd = open(lock->log_file, oflags, 0666);
+ if (logfd < 0) {
+ if (!(oflags & O_CREAT) && errno == ENOENT)
+ return 0;
+
+ if ((oflags & O_CREAT) && errno == EISDIR) {
+ if (remove_empty_directories(lock->log_file)) {
+ return error("There are still logs under '%s'",
+ lock->log_file);
+ }
+ logfd = open(lock->log_file, oflags, 0666);
+ }
+
+ if (logfd < 0)
+ return error("Unable to append to %s: %s",
+ lock->log_file, strerror(errno));
+ }
+
+ committer = git_committer_info(1);
+ if (msg) {
+ maxlen = strlen(committer) + strlen(msg) + 2*40 + 5;
+ logrec = xmalloc(maxlen);
+ len = snprintf(logrec, maxlen, "%s %s %s\t%s\n",
+ sha1_to_hex(lock->old_sha1),
+ sha1_to_hex(sha1),
+ committer,
+ msg);
+ }
+ else {
+ maxlen = strlen(committer) + 2*40 + 4;
+ logrec = xmalloc(maxlen);
+ len = snprintf(logrec, maxlen, "%s %s %s\n",
+ sha1_to_hex(lock->old_sha1),
+ sha1_to_hex(sha1),
+ committer);
+ }
+ written = len <= maxlen ? write(logfd, logrec, len) : -1;
+ free(logrec);
+ close(logfd);
+ if (written != len)
+ return error("Unable to append to %s", lock->log_file);
+ return 0;
+}
+
+int write_ref_sha1(struct ref_lock *lock,
+ const unsigned char *sha1, const char *logmsg)
+{
+ static char term = '\n';
+
+ if (!lock)
+ return -1;
+ if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
+ unlock_ref(lock);
+ return 0;
+ }
+ if (write(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
+ write(lock->lock_fd, &term, 1) != 1
+ || close(lock->lock_fd) < 0) {
+ error("Couldn't write %s", lock->lk->filename);
+ unlock_ref(lock);
+ return -1;
+ }
+ invalidate_cached_refs();
+ if (log_ref_write(lock, sha1, logmsg) < 0) {
+ unlock_ref(lock);
return -1;
- filename = ref_file_name(ref);
- lock_filename = ref_lock_file_name(ref);
- if (safe_create_leading_directories(filename))
- die("unable to create leading directory for %s", filename);
- fd = open(lock_filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
- if (fd < 0) {
- error("Writing %s", lock_filename);
- perror("Open");
- }
- retval = write_ref_file(filename, lock_filename, fd, sha1);
- free(filename);
- free(lock_filename);
- return retval;
+ }
+ if (commit_lock_file(lock->lk)) {
+ error("Couldn't set %s", lock->ref_name);
+ unlock_ref(lock);
+ return -1;
+ }
+ lock->lock_fd = -1;
+ unlock_ref(lock);
+ return 0;
+}
+
+int read_ref_at(const char *ref, unsigned long at_time, int cnt, unsigned char *sha1)
+{
+ const char *logfile, *logdata, *logend, *rec, *lastgt, *lastrec;
+ char *tz_c;
+ int logfd, tz;
+ struct stat st;
+ unsigned long date;
+ unsigned char logged_sha1[20];
+
+ logfile = git_path("logs/%s", ref);
+ logfd = open(logfile, O_RDONLY, 0);
+ if (logfd < 0)
+ die("Unable to read log %s: %s", logfile, strerror(errno));
+ fstat(logfd, &st);
+ if (!st.st_size)
+ die("Log %s is empty.", logfile);
+ logdata = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, logfd, 0);
+ close(logfd);
+
+ lastrec = NULL;
+ rec = logend = logdata + st.st_size;
+ while (logdata < rec) {
+ if (logdata < rec && *(rec-1) == '\n')
+ rec--;
+ lastgt = NULL;
+ while (logdata < rec && *(rec-1) != '\n') {
+ rec--;
+ if (*rec == '>')
+ lastgt = rec;
+ }
+ if (!lastgt)
+ die("Log %s is corrupt.", logfile);
+ date = strtoul(lastgt + 1, &tz_c, 10);
+ if (date <= at_time || cnt == 0) {
+ if (lastrec) {
+ if (get_sha1_hex(lastrec, logged_sha1))
+ die("Log %s is corrupt.", logfile);
+ if (get_sha1_hex(rec + 41, sha1))
+ die("Log %s is corrupt.", logfile);
+ if (hashcmp(logged_sha1, sha1)) {
+ tz = strtoul(tz_c, NULL, 10);
+ fprintf(stderr,
+ "warning: Log %s has gap after %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ }
+ }
+ else if (date == at_time) {
+ if (get_sha1_hex(rec + 41, sha1))
+ die("Log %s is corrupt.", logfile);
+ }
+ else {
+ if (get_sha1_hex(rec + 41, logged_sha1))
+ die("Log %s is corrupt.", logfile);
+ if (hashcmp(logged_sha1, sha1)) {
+ tz = strtoul(tz_c, NULL, 10);
+ fprintf(stderr,
+ "warning: Log %s unexpectedly ended on %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ }
+ }
+ munmap((void*)logdata, st.st_size);
+ return 0;
+ }
+ lastrec = rec;
+ if (cnt > 0)
+ cnt--;
+ }
+
+ rec = logdata;
+ while (rec < logend && *rec != '>' && *rec != '\n')
+ rec++;
+ if (rec == logend || *rec == '\n')
+ die("Log %s is corrupt.", logfile);
+ date = strtoul(rec + 1, &tz_c, 10);
+ tz = strtoul(tz_c, NULL, 10);
+ if (get_sha1_hex(logdata, sha1))
+ die("Log %s is corrupt.", logfile);
+ munmap((void*)logdata, st.st_size);
+ fprintf(stderr, "warning: Log %s only goes back to %s.\n",
+ logfile, show_rfc2822_date(date, tz));
+ return 0;
}