--- /dev/null
+#ifndef CONFIG_H
+#define CONFIG_H
+
+/* git_config_parse_key() returns these negated: */
+#define CONFIG_INVALID_KEY 1
+#define CONFIG_NO_SECTION_OR_NAME 2
+/* git_config_set_gently(), git_config_set_multivar_gently() return the above or these: */
+#define CONFIG_NO_LOCK -1
+#define CONFIG_INVALID_FILE 3
+#define CONFIG_NO_WRITE 4
+#define CONFIG_NOTHING_SET 5
+#define CONFIG_INVALID_PATTERN 6
+#define CONFIG_GENERIC_ERROR 7
+
+#define CONFIG_REGEX_NONE ((void *)1)
+
+struct git_config_source {
+ unsigned int use_stdin:1;
+ const char *file;
+ const char *blob;
+};
+
+enum config_origin_type {
+ CONFIG_ORIGIN_BLOB,
+ CONFIG_ORIGIN_FILE,
+ CONFIG_ORIGIN_STDIN,
+ CONFIG_ORIGIN_SUBMODULE_BLOB,
+ CONFIG_ORIGIN_CMDLINE
+};
+
+struct config_options {
+ unsigned int respect_includes : 1;
+ const char *commondir;
+ const char *git_dir;
+};
+
+typedef int (*config_fn_t)(const char *, const char *, void *);
+extern int git_default_config(const char *, const char *, void *);
+extern int git_config_from_file(config_fn_t fn, const char *, void *);
+extern int git_config_from_mem(config_fn_t fn, const enum config_origin_type,
+ const char *name, const char *buf, size_t len, void *data);
+extern int git_config_from_blob_oid(config_fn_t fn, const char *name,
+ const struct object_id *oid, void *data);
+extern void git_config_push_parameter(const char *text);
+extern int git_config_from_parameters(config_fn_t fn, void *data);
+extern void read_early_config(config_fn_t cb, void *data);
+extern void git_config(config_fn_t fn, void *);
+extern int config_with_options(config_fn_t fn, void *,
+ struct git_config_source *config_source,
+ const struct config_options *opts);
+extern int git_parse_ulong(const char *, unsigned long *);
+extern int git_parse_maybe_bool(const char *);
+extern int git_config_int(const char *, const char *);
+extern int64_t git_config_int64(const char *, const char *);
+extern unsigned long git_config_ulong(const char *, const char *);
+extern ssize_t git_config_ssize_t(const char *, const char *);
+extern int git_config_bool_or_int(const char *, const char *, int *);
+extern int git_config_bool(const char *, const char *);
+extern int git_config_maybe_bool(const char *, const char *);
+extern int git_config_string(const char **, const char *, const char *);
+extern int git_config_pathname(const char **, const char *, const char *);
+extern int git_config_set_in_file_gently(const char *, const char *, const char *);
+extern void git_config_set_in_file(const char *, const char *, const char *);
+extern int git_config_set_gently(const char *, const char *);
+extern void git_config_set(const char *, const char *);
+extern int git_config_parse_key(const char *, char **, int *);
+extern int git_config_key_is_valid(const char *key);
+extern int git_config_set_multivar_gently(const char *, const char *, const char *, int);
+extern void git_config_set_multivar(const char *, const char *, const char *, int);
+extern int git_config_set_multivar_in_file_gently(const char *, const char *, const char *, const char *, int);
+extern void git_config_set_multivar_in_file(const char *, const char *, const char *, const char *, int);
+extern int git_config_rename_section(const char *, const char *);
+extern int git_config_rename_section_in_file(const char *, const char *, const char *);
++extern int git_config_copy_section(const char *, const char *);
++extern int git_config_copy_section_in_file(const char *, const char *, const char *);
+extern const char *git_etc_gitconfig(void);
+extern int git_env_bool(const char *, int);
+extern unsigned long git_env_ulong(const char *, unsigned long);
+extern int git_config_system(void);
+extern int config_error_nonbool(const char *);
+#if defined(__GNUC__)
+#define config_error_nonbool(s) (config_error_nonbool(s), const_error())
+#endif
+
+extern int git_config_parse_parameter(const char *, config_fn_t fn, void *data);
+
+enum config_scope {
+ CONFIG_SCOPE_UNKNOWN = 0,
+ CONFIG_SCOPE_SYSTEM,
+ CONFIG_SCOPE_GLOBAL,
+ CONFIG_SCOPE_REPO,
+ CONFIG_SCOPE_CMDLINE,
+};
+
+extern enum config_scope current_config_scope(void);
+extern const char *current_config_origin_type(void);
+extern const char *current_config_name(void);
+
+struct config_include_data {
+ int depth;
+ config_fn_t fn;
+ void *data;
+ const struct config_options *opts;
+};
+#define CONFIG_INCLUDE_INIT { 0 }
+extern int git_config_include(const char *name, const char *value, void *data);
+
+/*
+ * Match and parse a config key of the form:
+ *
+ * section.(subsection.)?key
+ *
+ * (i.e., what gets handed to a config_fn_t). The caller provides the section;
+ * we return -1 if it does not match, 0 otherwise. The subsection and key
+ * out-parameters are filled by the function (and *subsection is NULL if it is
+ * missing).
+ *
+ * If the subsection pointer-to-pointer passed in is NULL, returns 0 only if
+ * there is no subsection at all.
+ */
+extern int parse_config_key(const char *var,
+ const char *section,
+ const char **subsection, int *subsection_len,
+ const char **key);
+
+struct config_set_element {
+ struct hashmap_entry ent;
+ char *key;
+ struct string_list value_list;
+};
+
+struct configset_list_item {
+ struct config_set_element *e;
+ int value_index;
+};
+
+/*
+ * the contents of the list are ordered according to their
+ * position in the config files and order of parsing the files.
+ * (i.e. key-value pair at the last position of .git/config will
+ * be at the last item of the list)
+ */
+struct configset_list {
+ struct configset_list_item *items;
+ unsigned int nr, alloc;
+};
+
+struct config_set {
+ struct hashmap config_hash;
+ int hash_initialized;
+ struct configset_list list;
+};
+
+extern void git_configset_init(struct config_set *cs);
+extern int git_configset_add_file(struct config_set *cs, const char *filename);
+extern int git_configset_get_value(struct config_set *cs, const char *key, const char **value);
+extern const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key);
+extern void git_configset_clear(struct config_set *cs);
+extern int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest);
+extern int git_configset_get_string(struct config_set *cs, const char *key, char **dest);
+extern int git_configset_get_int(struct config_set *cs, const char *key, int *dest);
+extern int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest);
+extern int git_configset_get_bool(struct config_set *cs, const char *key, int *dest);
+extern int git_configset_get_bool_or_int(struct config_set *cs, const char *key, int *is_bool, int *dest);
+extern int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest);
+extern int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest);
+
+/* Functions for reading a repository's config */
+struct repository;
+extern void repo_config(struct repository *repo, config_fn_t fn, void *data);
+extern int repo_config_get_value(struct repository *repo,
+ const char *key, const char **value);
+extern const struct string_list *repo_config_get_value_multi(struct repository *repo,
+ const char *key);
+extern int repo_config_get_string_const(struct repository *repo,
+ const char *key, const char **dest);
+extern int repo_config_get_string(struct repository *repo,
+ const char *key, char **dest);
+extern int repo_config_get_int(struct repository *repo,
+ const char *key, int *dest);
+extern int repo_config_get_ulong(struct repository *repo,
+ const char *key, unsigned long *dest);
+extern int repo_config_get_bool(struct repository *repo,
+ const char *key, int *dest);
+extern int repo_config_get_bool_or_int(struct repository *repo,
+ const char *key, int *is_bool, int *dest);
+extern int repo_config_get_maybe_bool(struct repository *repo,
+ const char *key, int *dest);
+extern int repo_config_get_pathname(struct repository *repo,
+ const char *key, const char **dest);
+
+extern int git_config_get_value(const char *key, const char **value);
+extern const struct string_list *git_config_get_value_multi(const char *key);
+extern void git_config_clear(void);
+extern int git_config_get_string_const(const char *key, const char **dest);
+extern int git_config_get_string(const char *key, char **dest);
+extern int git_config_get_int(const char *key, int *dest);
+extern int git_config_get_ulong(const char *key, unsigned long *dest);
+extern int git_config_get_bool(const char *key, int *dest);
+extern int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest);
+extern int git_config_get_maybe_bool(const char *key, int *dest);
+extern int git_config_get_pathname(const char *key, const char **dest);
+extern int git_config_get_untracked_cache(void);
+extern int git_config_get_split_index(void);
+extern int git_config_get_max_percent_split_change(void);
+
+/* This dies if the configured or default date is in the future */
+extern int git_config_get_expiry(const char *key, const char **output);
+
+struct key_value_info {
+ const char *filename;
+ int linenr;
+ enum config_origin_type origin_type;
+ enum config_scope scope;
+};
+
+extern NORETURN void git_die_config(const char *key, const char *err, ...) __attribute__((format(printf, 2, 3)));
+extern NORETURN void git_die_config_linenr(const char *key, const char *filename, int linenr);
+
+#endif /* CONFIG_H */
--- /dev/null
+#include "../cache.h"
+#include "../config.h"
+#include "../refs.h"
+#include "refs-internal.h"
+#include "ref-cache.h"
+#include "packed-backend.h"
+#include "../iterator.h"
+#include "../lockfile.h"
+
+struct packed_ref_cache {
+ struct ref_cache *cache;
+
+ /*
+ * Count of references to the data structure in this instance,
+ * including the pointer from files_ref_store::packed if any.
+ * The data will not be freed as long as the reference count
+ * is nonzero.
+ */
+ unsigned int referrers;
+
+ /* The metadata from when this packed-refs cache was read */
+ struct stat_validity validity;
+};
+
+/*
+ * Increment the reference count of *packed_refs.
+ */
+static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
+{
+ packed_refs->referrers++;
+}
+
+/*
+ * Decrease the reference count of *packed_refs. If it goes to zero,
+ * free *packed_refs and return true; otherwise return false.
+ */
+static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
+{
+ if (!--packed_refs->referrers) {
+ free_ref_cache(packed_refs->cache);
+ stat_validity_clear(&packed_refs->validity);
+ free(packed_refs);
+ return 1;
+ } else {
+ return 0;
+ }
+}
+
+/*
+ * A container for `packed-refs`-related data. It is not (yet) a
+ * `ref_store`.
+ */
+struct packed_ref_store {
+ struct ref_store base;
+
+ unsigned int store_flags;
+
+ /* The path of the "packed-refs" file: */
+ char *path;
+
+ /*
+ * A cache of the values read from the `packed-refs` file, if
+ * it might still be current; otherwise, NULL.
+ */
+ struct packed_ref_cache *cache;
+
+ /*
+ * Lock used for the "packed-refs" file. Note that this (and
+ * thus the enclosing `packed_ref_store`) must not be freed.
+ */
+ struct lock_file lock;
+
+ /*
+ * Temporary file used when rewriting new contents to the
+ * "packed-refs" file. Note that this (and thus the enclosing
+ * `packed_ref_store`) must not be freed.
+ */
+ struct tempfile tempfile;
+};
+
+struct ref_store *packed_ref_store_create(const char *path,
+ unsigned int store_flags)
+{
+ struct packed_ref_store *refs = xcalloc(1, sizeof(*refs));
+ struct ref_store *ref_store = (struct ref_store *)refs;
+
+ base_ref_store_init(ref_store, &refs_be_packed);
+ refs->store_flags = store_flags;
+
+ refs->path = xstrdup(path);
+ return ref_store;
+}
+
+/*
+ * Die if refs is not the main ref store. caller is used in any
+ * necessary error messages.
+ */
+static void packed_assert_main_repository(struct packed_ref_store *refs,
+ const char *caller)
+{
+ if (refs->store_flags & REF_STORE_MAIN)
+ return;
+
+ die("BUG: operation %s only allowed for main ref store", caller);
+}
+
+/*
+ * Downcast `ref_store` to `packed_ref_store`. Die if `ref_store` is
+ * not a `packed_ref_store`. Also die if `packed_ref_store` doesn't
+ * support at least the flags specified in `required_flags`. `caller`
+ * is used in any necessary error messages.
+ */
+static struct packed_ref_store *packed_downcast(struct ref_store *ref_store,
+ unsigned int required_flags,
+ const char *caller)
+{
+ struct packed_ref_store *refs;
+
+ if (ref_store->be != &refs_be_packed)
+ die("BUG: ref_store is type \"%s\" not \"packed\" in %s",
+ ref_store->be->name, caller);
+
+ refs = (struct packed_ref_store *)ref_store;
+
+ if ((refs->store_flags & required_flags) != required_flags)
+ die("BUG: unallowed operation (%s), requires %x, has %x\n",
+ caller, required_flags, refs->store_flags);
+
+ return refs;
+}
+
+static void clear_packed_ref_cache(struct packed_ref_store *refs)
+{
+ if (refs->cache) {
+ struct packed_ref_cache *cache = refs->cache;
+
+ refs->cache = NULL;
+ release_packed_ref_cache(cache);
+ }
+}
+
+/* The length of a peeled reference line in packed-refs, including EOL: */
+#define PEELED_LINE_LENGTH 42
+
+/*
+ * Parse one line from a packed-refs file. Write the SHA1 to sha1.
+ * Return a pointer to the refname within the line (null-terminated),
+ * or NULL if there was a problem.
+ */
+static const char *parse_ref_line(struct strbuf *line, struct object_id *oid)
+{
+ const char *ref;
+
+ if (parse_oid_hex(line->buf, oid, &ref) < 0)
+ return NULL;
+ if (!isspace(*ref++))
+ return NULL;
+
+ if (isspace(*ref))
+ return NULL;
+
+ if (line->buf[line->len - 1] != '\n')
+ return NULL;
+ line->buf[--line->len] = 0;
+
+ return ref;
+}
+
+/*
+ * Read from `packed_refs_file` into a newly-allocated
+ * `packed_ref_cache` and return it. The return value will already
+ * have its reference count incremented.
+ *
+ * A comment line of the form "# pack-refs with: " may contain zero or
+ * more traits. We interpret the traits as follows:
+ *
+ * No traits:
+ *
+ * Probably no references are peeled. But if the file contains a
+ * peeled value for a reference, we will use it.
+ *
+ * peeled:
+ *
+ * References under "refs/tags/", if they *can* be peeled, *are*
+ * peeled in this file. References outside of "refs/tags/" are
+ * probably not peeled even if they could have been, but if we find
+ * a peeled value for such a reference we will use it.
+ *
+ * fully-peeled:
+ *
+ * All references in the file that can be peeled are peeled.
+ * Inversely (and this is more important), any references in the
+ * file for which no peeled value is recorded is not peelable. This
+ * trait should typically be written alongside "peeled" for
+ * compatibility with older clients, but we do not require it
+ * (i.e., "peeled" is a no-op if "fully-peeled" is set).
+ */
+static struct packed_ref_cache *read_packed_refs(const char *packed_refs_file)
+{
+ FILE *f;
+ struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
+ struct ref_entry *last = NULL;
+ struct strbuf line = STRBUF_INIT;
+ enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
+ struct ref_dir *dir;
+
+ acquire_packed_ref_cache(packed_refs);
+ packed_refs->cache = create_ref_cache(NULL, NULL);
+ packed_refs->cache->root->flag &= ~REF_INCOMPLETE;
+
+ f = fopen(packed_refs_file, "r");
+ if (!f) {
+ if (errno == ENOENT) {
+ /*
+ * This is OK; it just means that no
+ * "packed-refs" file has been written yet,
+ * which is equivalent to it being empty.
+ */
+ return packed_refs;
+ } else {
+ die_errno("couldn't read %s", packed_refs_file);
+ }
+ }
+
+ stat_validity_update(&packed_refs->validity, fileno(f));
+
+ dir = get_ref_dir(packed_refs->cache->root);
+ while (strbuf_getwholeline(&line, f, '\n') != EOF) {
+ struct object_id oid;
+ const char *refname;
+ const char *traits;
+
+ if (!line.len || line.buf[line.len - 1] != '\n')
+ die("unterminated line in %s: %s", packed_refs_file, line.buf);
+
+ if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
+ if (strstr(traits, " fully-peeled "))
+ peeled = PEELED_FULLY;
+ else if (strstr(traits, " peeled "))
+ peeled = PEELED_TAGS;
+ /* perhaps other traits later as well */
+ continue;
+ }
+
+ refname = parse_ref_line(&line, &oid);
+ if (refname) {
+ int flag = REF_ISPACKED;
+
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
+ if (!refname_is_safe(refname))
+ die("packed refname is dangerous: %s", refname);
+ oidclr(&oid);
+ flag |= REF_BAD_NAME | REF_ISBROKEN;
+ }
+ last = create_ref_entry(refname, &oid, flag);
+ if (peeled == PEELED_FULLY ||
+ (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
+ last->flag |= REF_KNOWS_PEELED;
+ add_ref_entry(dir, last);
+ } else if (last &&
+ line.buf[0] == '^' &&
+ line.len == PEELED_LINE_LENGTH &&
+ line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
+ !get_oid_hex(line.buf + 1, &oid)) {
+ oidcpy(&last->u.value.peeled, &oid);
+ /*
+ * Regardless of what the file header said,
+ * we definitely know the value of *this*
+ * reference:
+ */
+ last->flag |= REF_KNOWS_PEELED;
+ } else {
+ strbuf_setlen(&line, line.len - 1);
+ die("unexpected line in %s: %s", packed_refs_file, line.buf);
+ }
+ }
+
+ fclose(f);
+ strbuf_release(&line);
+
+ return packed_refs;
+}
+
+/*
+ * Check that the packed refs cache (if any) still reflects the
+ * contents of the file. If not, clear the cache.
+ */
+static void validate_packed_ref_cache(struct packed_ref_store *refs)
+{
+ if (refs->cache &&
+ !stat_validity_check(&refs->cache->validity, refs->path))
+ clear_packed_ref_cache(refs);
+}
+
+/*
+ * Get the packed_ref_cache for the specified packed_ref_store,
+ * creating and populating it if it hasn't been read before or if the
+ * file has been changed (according to its `validity` field) since it
+ * was last read. On the other hand, if we hold the lock, then assume
+ * that the file hasn't been changed out from under us, so skip the
+ * extra `stat()` call in `stat_validity_check()`.
+ */
+static struct packed_ref_cache *get_packed_ref_cache(struct packed_ref_store *refs)
+{
+ if (!is_lock_file_locked(&refs->lock))
+ validate_packed_ref_cache(refs);
+
+ if (!refs->cache)
+ refs->cache = read_packed_refs(refs->path);
+
+ return refs->cache;
+}
+
+static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
+{
+ return get_ref_dir(packed_ref_cache->cache->root);
+}
+
+static struct ref_dir *get_packed_refs(struct packed_ref_store *refs)
+{
+ return get_packed_ref_dir(get_packed_ref_cache(refs));
+}
+
+/*
+ * Add or overwrite a reference in the in-memory packed reference
+ * cache. This may only be called while the packed-refs file is locked
+ * (see packed_refs_lock()). To actually write the packed-refs file,
+ * call commit_packed_refs().
+ */
+void add_packed_ref(struct ref_store *ref_store,
+ const char *refname, const struct object_id *oid)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_WRITE,
+ "add_packed_ref");
+ struct ref_dir *packed_refs;
+ struct ref_entry *packed_entry;
+
+ if (!is_lock_file_locked(&refs->lock))
+ die("BUG: packed refs not locked");
+
+ if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
+ die("Reference has invalid format: '%s'", refname);
+
+ packed_refs = get_packed_refs(refs);
+ packed_entry = find_ref_entry(packed_refs, refname);
+ if (packed_entry) {
+ /* Overwrite the existing entry: */
+ oidcpy(&packed_entry->u.value.oid, oid);
+ packed_entry->flag = REF_ISPACKED;
+ oidclr(&packed_entry->u.value.peeled);
+ } else {
+ packed_entry = create_ref_entry(refname, oid, REF_ISPACKED);
+ add_ref_entry(packed_refs, packed_entry);
+ }
+}
+
+/*
+ * Return the ref_entry for the given refname from the packed
+ * references. If it does not exist, return NULL.
+ */
+static struct ref_entry *get_packed_ref(struct packed_ref_store *refs,
+ const char *refname)
+{
+ return find_ref_entry(get_packed_refs(refs), refname);
+}
+
+static int packed_read_raw_ref(struct ref_store *ref_store,
+ const char *refname, unsigned char *sha1,
+ struct strbuf *referent, unsigned int *type)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
+
+ struct ref_entry *entry;
+
+ *type = 0;
+
+ entry = get_packed_ref(refs, refname);
+ if (!entry) {
+ errno = ENOENT;
+ return -1;
+ }
+
+ hashcpy(sha1, entry->u.value.oid.hash);
+ *type = REF_ISPACKED;
+ return 0;
+}
+
+static int packed_peel_ref(struct ref_store *ref_store,
+ const char *refname, unsigned char *sha1)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB,
+ "peel_ref");
+ struct ref_entry *r = get_packed_ref(refs, refname);
+
+ if (!r || peel_entry(r, 0))
+ return -1;
+
+ hashcpy(sha1, r->u.value.peeled.hash);
+ return 0;
+}
+
+struct packed_ref_iterator {
+ struct ref_iterator base;
+
+ struct packed_ref_cache *cache;
+ struct ref_iterator *iter0;
+ unsigned int flags;
+};
+
+static int packed_ref_iterator_advance(struct ref_iterator *ref_iterator)
+{
+ struct packed_ref_iterator *iter =
+ (struct packed_ref_iterator *)ref_iterator;
+ int ok;
+
+ while ((ok = ref_iterator_advance(iter->iter0)) == ITER_OK) {
+ if (iter->flags & DO_FOR_EACH_PER_WORKTREE_ONLY &&
+ ref_type(iter->iter0->refname) != REF_TYPE_PER_WORKTREE)
+ continue;
+
+ if (!(iter->flags & DO_FOR_EACH_INCLUDE_BROKEN) &&
+ !ref_resolves_to_object(iter->iter0->refname,
+ iter->iter0->oid,
+ iter->iter0->flags))
+ continue;
+
+ iter->base.refname = iter->iter0->refname;
+ iter->base.oid = iter->iter0->oid;
+ iter->base.flags = iter->iter0->flags;
+ return ITER_OK;
+ }
+
+ iter->iter0 = NULL;
+ if (ref_iterator_abort(ref_iterator) != ITER_DONE)
+ ok = ITER_ERROR;
+
+ return ok;
+}
+
+static int packed_ref_iterator_peel(struct ref_iterator *ref_iterator,
+ struct object_id *peeled)
+{
+ struct packed_ref_iterator *iter =
+ (struct packed_ref_iterator *)ref_iterator;
+
+ return ref_iterator_peel(iter->iter0, peeled);
+}
+
+static int packed_ref_iterator_abort(struct ref_iterator *ref_iterator)
+{
+ struct packed_ref_iterator *iter =
+ (struct packed_ref_iterator *)ref_iterator;
+ int ok = ITER_DONE;
+
+ if (iter->iter0)
+ ok = ref_iterator_abort(iter->iter0);
+
+ release_packed_ref_cache(iter->cache);
+ base_ref_iterator_free(ref_iterator);
+ return ok;
+}
+
+static struct ref_iterator_vtable packed_ref_iterator_vtable = {
+ packed_ref_iterator_advance,
+ packed_ref_iterator_peel,
+ packed_ref_iterator_abort
+};
+
+static struct ref_iterator *packed_ref_iterator_begin(
+ struct ref_store *ref_store,
+ const char *prefix, unsigned int flags)
+{
+ struct packed_ref_store *refs;
+ struct packed_ref_iterator *iter;
+ struct ref_iterator *ref_iterator;
+ unsigned int required_flags = REF_STORE_READ;
+
+ if (!(flags & DO_FOR_EACH_INCLUDE_BROKEN))
+ required_flags |= REF_STORE_ODB;
+ refs = packed_downcast(ref_store, required_flags, "ref_iterator_begin");
+
+ iter = xcalloc(1, sizeof(*iter));
+ ref_iterator = &iter->base;
+ base_ref_iterator_init(ref_iterator, &packed_ref_iterator_vtable);
+
+ /*
+ * Note that get_packed_ref_cache() internally checks whether
+ * the packed-ref cache is up to date with what is on disk,
+ * and re-reads it if not.
+ */
+
+ iter->cache = get_packed_ref_cache(refs);
+ acquire_packed_ref_cache(iter->cache);
+ iter->iter0 = cache_ref_iterator_begin(iter->cache->cache, prefix, 0);
+
+ iter->flags = flags;
+
+ return ref_iterator;
+}
+
+/*
+ * Write an entry to the packed-refs file for the specified refname.
+ * If peeled is non-NULL, write it as the entry's peeled value. On
+ * error, return a nonzero value and leave errno set at the value left
+ * by the failing call to `fprintf()`.
+ */
+static int write_packed_entry(FILE *fh, const char *refname,
+ const unsigned char *sha1,
+ const unsigned char *peeled)
+{
+ if (fprintf(fh, "%s %s\n", sha1_to_hex(sha1), refname) < 0 ||
+ (peeled && fprintf(fh, "^%s\n", sha1_to_hex(peeled)) < 0))
+ return -1;
+
+ return 0;
+}
+
+int packed_refs_lock(struct ref_store *ref_store, int flags, struct strbuf *err)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
+ "packed_refs_lock");
+ static int timeout_configured = 0;
+ static int timeout_value = 1000;
+ struct packed_ref_cache *packed_ref_cache;
+
+ if (!timeout_configured) {
+ git_config_get_int("core.packedrefstimeout", &timeout_value);
+ timeout_configured = 1;
+ }
+
+ /*
+ * Note that we close the lockfile immediately because we
+ * don't write new content to it, but rather to a separate
+ * tempfile.
+ */
+ if (hold_lock_file_for_update_timeout(
+ &refs->lock,
+ refs->path,
+ flags, timeout_value) < 0) {
+ unable_to_lock_message(refs->path, errno, err);
+ return -1;
+ }
+
+ if (close_lock_file(&refs->lock)) {
+ strbuf_addf(err, "unable to close %s: %s", refs->path, strerror(errno));
+ return -1;
+ }
+
+ /*
+ * Now that we hold the `packed-refs` lock, make sure that our
+ * cache matches the current version of the file. Normally
+ * `get_packed_ref_cache()` does that for us, but that
+ * function assumes that when the file is locked, any existing
+ * cache is still valid. We've just locked the file, but it
+ * might have changed the moment *before* we locked it.
+ */
+ validate_packed_ref_cache(refs);
+
+ packed_ref_cache = get_packed_ref_cache(refs);
+ /* Increment the reference count to prevent it from being freed: */
+ acquire_packed_ref_cache(packed_ref_cache);
+ return 0;
+}
+
+void packed_refs_unlock(struct ref_store *ref_store)
+{
+ struct packed_ref_store *refs = packed_downcast(
+ ref_store,
+ REF_STORE_READ | REF_STORE_WRITE,
+ "packed_refs_unlock");
+
+ if (!is_lock_file_locked(&refs->lock))
+ die("BUG: packed_refs_unlock() called when not locked");
+ rollback_lock_file(&refs->lock);
+ release_packed_ref_cache(refs->cache);
+}
+
+int packed_refs_is_locked(struct ref_store *ref_store)
+{
+ struct packed_ref_store *refs = packed_downcast(
+ ref_store,
+ REF_STORE_READ | REF_STORE_WRITE,
+ "packed_refs_is_locked");
+
+ return is_lock_file_locked(&refs->lock);
+}
+
+/*
+ * The packed-refs header line that we write out. Perhaps other
+ * traits will be added later. The trailing space is required.
+ */
+static const char PACKED_REFS_HEADER[] =
+ "# pack-refs with: peeled fully-peeled \n";
+
+/*
+ * Write the current version of the packed refs cache from memory to
+ * disk. The packed-refs file must already be locked for writing (see
+ * packed_refs_lock()). Return zero on success. On errors, rollback
+ * the lockfile, write an error message to `err`, and return a nonzero
+ * value.
+ */
+int commit_packed_refs(struct ref_store *ref_store, struct strbuf *err)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
+ "commit_packed_refs");
+ struct packed_ref_cache *packed_ref_cache =
+ get_packed_ref_cache(refs);
+ int ok;
+ struct strbuf sb = STRBUF_INIT;
+ FILE *out;
+ struct ref_iterator *iter;
+
+ if (!is_lock_file_locked(&refs->lock))
+ die("BUG: commit_packed_refs() called when unlocked");
+
+ strbuf_addf(&sb, "%s.new", refs->path);
+ if (create_tempfile(&refs->tempfile, sb.buf) < 0) {
+ strbuf_addf(err, "unable to create file %s: %s",
+ sb.buf, strerror(errno));
+ strbuf_release(&sb);
+ return -1;
+ }
+ strbuf_release(&sb);
+
+ out = fdopen_tempfile(&refs->tempfile, "w");
+ if (!out) {
+ strbuf_addf(err, "unable to fdopen packed-refs tempfile: %s",
+ strerror(errno));
+ goto error;
+ }
+
+ if (fprintf(out, "%s", PACKED_REFS_HEADER) < 0) {
+ strbuf_addf(err, "error writing to %s: %s",
+ get_tempfile_path(&refs->tempfile), strerror(errno));
+ goto error;
+ }
+
+ iter = cache_ref_iterator_begin(packed_ref_cache->cache, NULL, 0);
+ while ((ok = ref_iterator_advance(iter)) == ITER_OK) {
+ struct object_id peeled;
+ int peel_error = ref_iterator_peel(iter, &peeled);
+
+ if (write_packed_entry(out, iter->refname, iter->oid->hash,
+ peel_error ? NULL : peeled.hash)) {
+ strbuf_addf(err, "error writing to %s: %s",
+ get_tempfile_path(&refs->tempfile),
+ strerror(errno));
+ ref_iterator_abort(iter);
+ goto error;
+ }
+ }
+
+ if (ok != ITER_DONE) {
+ strbuf_addf(err, "unable to rewrite packed-refs file: "
+ "error iterating over old contents");
+ goto error;
+ }
+
+ if (rename_tempfile(&refs->tempfile, refs->path)) {
+ strbuf_addf(err, "error replacing %s: %s",
+ refs->path, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+
+error:
+ delete_tempfile(&refs->tempfile);
+ return -1;
+}
+
+/*
+ * Rewrite the packed-refs file, omitting any refs listed in
+ * 'refnames'. On error, leave packed-refs unchanged, write an error
+ * message to 'err', and return a nonzero value. The packed refs lock
+ * must be held when calling this function; it will still be held when
+ * the function returns.
+ *
+ * The refs in 'refnames' needn't be sorted. `err` must not be NULL.
+ */
+int repack_without_refs(struct ref_store *ref_store,
+ struct string_list *refnames, struct strbuf *err)
+{
+ struct packed_ref_store *refs =
+ packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
+ "repack_without_refs");
+ struct ref_dir *packed;
+ struct string_list_item *refname;
+ int needs_repacking = 0, removed = 0;
+
+ packed_assert_main_repository(refs, "repack_without_refs");
+ assert(err);
+
+ if (!is_lock_file_locked(&refs->lock))
+ die("BUG: repack_without_refs called without holding lock");
+
+ /* Look for a packed ref */
+ for_each_string_list_item(refname, refnames) {
+ if (get_packed_ref(refs, refname->string)) {
+ needs_repacking = 1;
+ break;
+ }
+ }
+
+ /* Avoid locking if we have nothing to do */
+ if (!needs_repacking)
+ return 0; /* no refname exists in packed refs */
+
+ packed = get_packed_refs(refs);
+
+ /* Remove refnames from the cache */
+ for_each_string_list_item(refname, refnames)
+ if (remove_entry_from_dir(packed, refname->string) != -1)
+ removed = 1;
+ if (!removed) {
+ /*
+ * All packed entries disappeared while we were
+ * acquiring the lock.
+ */
+ clear_packed_ref_cache(refs);
+ return 0;
+ }
+
+ /* Write what remains */
+ return commit_packed_refs(&refs->base, err);
+}
+
+static int packed_init_db(struct ref_store *ref_store, struct strbuf *err)
+{
+ /* Nothing to do. */
+ return 0;
+}
+
+static int packed_transaction_prepare(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ die("BUG: not implemented yet");
+}
+
+static int packed_transaction_abort(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ die("BUG: not implemented yet");
+}
+
+static int packed_transaction_finish(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ die("BUG: not implemented yet");
+}
+
+static int packed_initial_transaction_commit(struct ref_store *ref_store,
+ struct ref_transaction *transaction,
+ struct strbuf *err)
+{
+ return ref_transaction_commit(transaction, err);
+}
+
+static int packed_delete_refs(struct ref_store *ref_store, const char *msg,
+ struct string_list *refnames, unsigned int flags)
+{
+ die("BUG: not implemented yet");
+}
+
+static int packed_pack_refs(struct ref_store *ref_store, unsigned int flags)
+{
+ /*
+ * Packed refs are already packed. It might be that loose refs
+ * are packed *into* a packed refs store, but that is done by
+ * updating the packed references via a transaction.
+ */
+ return 0;
+}
+
+static int packed_create_symref(struct ref_store *ref_store,
+ const char *refname, const char *target,
+ const char *logmsg)
+{
+ die("BUG: packed reference store does not support symrefs");
+}
+
+static int packed_rename_ref(struct ref_store *ref_store,
+ const char *oldrefname, const char *newrefname,
+ const char *logmsg)
+{
+ die("BUG: packed reference store does not support renaming references");
+}
+
++static int packed_copy_ref(struct ref_store *ref_store,
++ const char *oldrefname, const char *newrefname,
++ const char *logmsg)
++{
++ die("BUG: packed reference store does not support copying references");
++}
++
+static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_store)
+{
+ return empty_ref_iterator_begin();
+}
+
+static int packed_for_each_reflog_ent(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn, void *cb_data)
+{
+ return 0;
+}
+
+static int packed_for_each_reflog_ent_reverse(struct ref_store *ref_store,
+ const char *refname,
+ each_reflog_ent_fn fn,
+ void *cb_data)
+{
+ return 0;
+}
+
+static int packed_reflog_exists(struct ref_store *ref_store,
+ const char *refname)
+{
+ return 0;
+}
+
+static int packed_create_reflog(struct ref_store *ref_store,
+ const char *refname, int force_create,
+ struct strbuf *err)
+{
+ die("BUG: packed reference store does not support reflogs");
+}
+
+static int packed_delete_reflog(struct ref_store *ref_store,
+ const char *refname)
+{
+ return 0;
+}
+
+static int packed_reflog_expire(struct ref_store *ref_store,
+ const char *refname, const unsigned char *sha1,
+ unsigned int flags,
+ reflog_expiry_prepare_fn prepare_fn,
+ reflog_expiry_should_prune_fn should_prune_fn,
+ reflog_expiry_cleanup_fn cleanup_fn,
+ void *policy_cb_data)
+{
+ return 0;
+}
+
+struct ref_storage_be refs_be_packed = {
+ NULL,
+ "packed",
+ packed_ref_store_create,
+ packed_init_db,
+ packed_transaction_prepare,
+ packed_transaction_finish,
+ packed_transaction_abort,
+ packed_initial_transaction_commit,
+
+ packed_pack_refs,
+ packed_peel_ref,
+ packed_create_symref,
+ packed_delete_refs,
+ packed_rename_ref,
++ packed_copy_ref,
+
+ packed_ref_iterator_begin,
+ packed_read_raw_ref,
+
+ packed_reflog_iterator_begin,
+ packed_for_each_reflog_ent,
+ packed_for_each_reflog_ent_reverse,
+ packed_reflog_exists,
+ packed_create_reflog,
+ packed_delete_reflog,
+ packed_reflog_expire
+};
git / git.git / commitdiff