2017-06-23 07:01:37 +00:00
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#include "../cache.h"
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#include "../refs.h"
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#include "refs-internal.h"
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#include "ref-cache.h"
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#include "packed-backend.h"
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#include "../iterator.h"
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#include "../lockfile.h"
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struct packed_ref_cache {
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struct ref_cache *cache;
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/*
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* Count of references to the data structure in this instance,
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* including the pointer from files_ref_store::packed if any.
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* The data will not be freed as long as the reference count
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* is nonzero.
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*/
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unsigned int referrers;
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/* The metadata from when this packed-refs cache was read */
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struct stat_validity validity;
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};
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/*
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* Increment the reference count of *packed_refs.
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*/
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static void acquire_packed_ref_cache(struct packed_ref_cache *packed_refs)
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{
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packed_refs->referrers++;
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}
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/*
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* Decrease the reference count of *packed_refs. If it goes to zero,
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* free *packed_refs and return true; otherwise return false.
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*/
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static int release_packed_ref_cache(struct packed_ref_cache *packed_refs)
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{
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if (!--packed_refs->referrers) {
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free_ref_cache(packed_refs->cache);
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stat_validity_clear(&packed_refs->validity);
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free(packed_refs);
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return 1;
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} else {
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return 0;
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}
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}
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/*
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* A container for `packed-refs`-related data. It is not (yet) a
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* `ref_store`.
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*/
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struct packed_ref_store {
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2017-06-23 07:01:38 +00:00
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struct ref_store base;
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2017-06-23 07:01:37 +00:00
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unsigned int store_flags;
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/* The path of the "packed-refs" file: */
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char *path;
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/*
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* A cache of the values read from the `packed-refs` file, if
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* it might still be current; otherwise, NULL.
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*/
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struct packed_ref_cache *cache;
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/*
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* Lock used for the "packed-refs" file. Note that this (and
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* thus the enclosing `packed_ref_store`) must not be freed.
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*/
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struct lock_file lock;
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};
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2017-06-23 07:01:38 +00:00
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struct ref_store *packed_ref_store_create(const char *path,
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unsigned int store_flags)
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2017-06-23 07:01:37 +00:00
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{
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struct packed_ref_store *refs = xcalloc(1, sizeof(*refs));
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2017-06-23 07:01:38 +00:00
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struct ref_store *ref_store = (struct ref_store *)refs;
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2017-06-23 07:01:37 +00:00
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2017-06-23 07:01:38 +00:00
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base_ref_store_init(ref_store, &refs_be_packed);
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2017-06-23 07:01:37 +00:00
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refs->store_flags = store_flags;
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2017-06-23 07:01:38 +00:00
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2017-06-23 07:01:37 +00:00
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refs->path = xstrdup(path);
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2017-06-23 07:01:38 +00:00
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return ref_store;
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2017-06-23 07:01:37 +00:00
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}
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/*
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* Die if refs is not the main ref store. caller is used in any
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* necessary error messages.
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*/
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static void packed_assert_main_repository(struct packed_ref_store *refs,
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const char *caller)
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{
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if (refs->store_flags & REF_STORE_MAIN)
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return;
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die("BUG: operation %s only allowed for main ref store", caller);
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}
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2017-06-23 07:01:38 +00:00
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/*
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* Downcast `ref_store` to `packed_ref_store`. Die if `ref_store` is
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* not a `packed_ref_store`. Also die if `packed_ref_store` doesn't
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* support at least the flags specified in `required_flags`. `caller`
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* is used in any necessary error messages.
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*/
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static struct packed_ref_store *packed_downcast(struct ref_store *ref_store,
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unsigned int required_flags,
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const char *caller)
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{
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struct packed_ref_store *refs;
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if (ref_store->be != &refs_be_packed)
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die("BUG: ref_store is type \"%s\" not \"packed\" in %s",
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ref_store->be->name, caller);
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refs = (struct packed_ref_store *)ref_store;
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if ((refs->store_flags & required_flags) != required_flags)
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die("BUG: unallowed operation (%s), requires %x, has %x\n",
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caller, required_flags, refs->store_flags);
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return refs;
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}
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2017-06-23 07:01:37 +00:00
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static void clear_packed_ref_cache(struct packed_ref_store *refs)
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{
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if (refs->cache) {
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struct packed_ref_cache *cache = refs->cache;
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if (is_lock_file_locked(&refs->lock))
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die("BUG: packed-ref cache cleared while locked");
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refs->cache = NULL;
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release_packed_ref_cache(cache);
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}
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}
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/* The length of a peeled reference line in packed-refs, including EOL: */
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#define PEELED_LINE_LENGTH 42
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/*
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* Parse one line from a packed-refs file. Write the SHA1 to sha1.
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* Return a pointer to the refname within the line (null-terminated),
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* or NULL if there was a problem.
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*/
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static const char *parse_ref_line(struct strbuf *line, struct object_id *oid)
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{
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const char *ref;
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if (parse_oid_hex(line->buf, oid, &ref) < 0)
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return NULL;
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if (!isspace(*ref++))
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return NULL;
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if (isspace(*ref))
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return NULL;
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if (line->buf[line->len - 1] != '\n')
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return NULL;
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line->buf[--line->len] = 0;
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return ref;
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}
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/*
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* Read from `packed_refs_file` into a newly-allocated
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* `packed_ref_cache` and return it. The return value will already
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* have its reference count incremented.
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*
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* A comment line of the form "# pack-refs with: " may contain zero or
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* more traits. We interpret the traits as follows:
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*
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* No traits:
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*
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* Probably no references are peeled. But if the file contains a
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* peeled value for a reference, we will use it.
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*
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* peeled:
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*
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* References under "refs/tags/", if they *can* be peeled, *are*
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* peeled in this file. References outside of "refs/tags/" are
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* probably not peeled even if they could have been, but if we find
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* a peeled value for such a reference we will use it.
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*
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* fully-peeled:
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*
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* All references in the file that can be peeled are peeled.
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* Inversely (and this is more important), any references in the
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* file for which no peeled value is recorded is not peelable. This
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* trait should typically be written alongside "peeled" for
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* compatibility with older clients, but we do not require it
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* (i.e., "peeled" is a no-op if "fully-peeled" is set).
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*/
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static struct packed_ref_cache *read_packed_refs(const char *packed_refs_file)
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{
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FILE *f;
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struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
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struct ref_entry *last = NULL;
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struct strbuf line = STRBUF_INIT;
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enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
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struct ref_dir *dir;
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acquire_packed_ref_cache(packed_refs);
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packed_refs->cache = create_ref_cache(NULL, NULL);
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packed_refs->cache->root->flag &= ~REF_INCOMPLETE;
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f = fopen(packed_refs_file, "r");
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if (!f) {
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if (errno == ENOENT) {
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/*
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* This is OK; it just means that no
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* "packed-refs" file has been written yet,
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* which is equivalent to it being empty.
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*/
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return packed_refs;
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} else {
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die_errno("couldn't read %s", packed_refs_file);
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}
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}
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stat_validity_update(&packed_refs->validity, fileno(f));
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dir = get_ref_dir(packed_refs->cache->root);
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while (strbuf_getwholeline(&line, f, '\n') != EOF) {
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struct object_id oid;
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const char *refname;
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const char *traits;
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if (skip_prefix(line.buf, "# pack-refs with:", &traits)) {
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if (strstr(traits, " fully-peeled "))
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peeled = PEELED_FULLY;
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else if (strstr(traits, " peeled "))
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peeled = PEELED_TAGS;
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/* perhaps other traits later as well */
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continue;
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}
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refname = parse_ref_line(&line, &oid);
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if (refname) {
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int flag = REF_ISPACKED;
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if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
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if (!refname_is_safe(refname))
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die("packed refname is dangerous: %s", refname);
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oidclr(&oid);
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flag |= REF_BAD_NAME | REF_ISBROKEN;
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}
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last = create_ref_entry(refname, &oid, flag);
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if (peeled == PEELED_FULLY ||
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(peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
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last->flag |= REF_KNOWS_PEELED;
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add_ref_entry(dir, last);
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continue;
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}
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if (last &&
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line.buf[0] == '^' &&
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line.len == PEELED_LINE_LENGTH &&
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line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
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!get_oid_hex(line.buf + 1, &oid)) {
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oidcpy(&last->u.value.peeled, &oid);
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/*
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* Regardless of what the file header said,
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* we definitely know the value of *this*
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* reference:
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*/
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last->flag |= REF_KNOWS_PEELED;
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}
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}
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fclose(f);
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strbuf_release(&line);
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return packed_refs;
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}
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/*
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* Check that the packed refs cache (if any) still reflects the
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* contents of the file. If not, clear the cache.
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*/
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static void validate_packed_ref_cache(struct packed_ref_store *refs)
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{
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if (refs->cache &&
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!stat_validity_check(&refs->cache->validity, refs->path))
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clear_packed_ref_cache(refs);
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}
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/*
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* Get the packed_ref_cache for the specified packed_ref_store,
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* creating and populating it if it hasn't been read before or if the
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* file has been changed (according to its `validity` field) since it
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* was last read. On the other hand, if we hold the lock, then assume
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* that the file hasn't been changed out from under us, so skip the
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* extra `stat()` call in `stat_validity_check()`.
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*/
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static struct packed_ref_cache *get_packed_ref_cache(struct packed_ref_store *refs)
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{
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if (!is_lock_file_locked(&refs->lock))
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validate_packed_ref_cache(refs);
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if (!refs->cache)
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refs->cache = read_packed_refs(refs->path);
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return refs->cache;
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}
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static struct ref_dir *get_packed_ref_dir(struct packed_ref_cache *packed_ref_cache)
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{
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return get_ref_dir(packed_ref_cache->cache->root);
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}
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static struct ref_dir *get_packed_refs(struct packed_ref_store *refs)
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{
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return get_packed_ref_dir(get_packed_ref_cache(refs));
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}
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/*
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* Add or overwrite a reference in the in-memory packed reference
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* cache. This may only be called while the packed-refs file is locked
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* (see lock_packed_refs()). To actually write the packed-refs file,
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* call commit_packed_refs().
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*/
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2017-06-23 07:01:38 +00:00
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void add_packed_ref(struct ref_store *ref_store,
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2017-06-23 07:01:37 +00:00
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const char *refname, const struct object_id *oid)
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{
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2017-06-23 07:01:38 +00:00
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struct packed_ref_store *refs =
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packed_downcast(ref_store, REF_STORE_WRITE,
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"add_packed_ref");
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2017-06-23 07:01:37 +00:00
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struct ref_dir *packed_refs;
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struct ref_entry *packed_entry;
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if (!is_lock_file_locked(&refs->lock))
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die("BUG: packed refs not locked");
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if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
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die("Reference has invalid format: '%s'", refname);
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packed_refs = get_packed_refs(refs);
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packed_entry = find_ref_entry(packed_refs, refname);
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if (packed_entry) {
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/* Overwrite the existing entry: */
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oidcpy(&packed_entry->u.value.oid, oid);
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packed_entry->flag = REF_ISPACKED;
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oidclr(&packed_entry->u.value.peeled);
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} else {
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packed_entry = create_ref_entry(refname, oid, REF_ISPACKED);
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add_ref_entry(packed_refs, packed_entry);
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}
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}
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/*
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* Return the ref_entry for the given refname from the packed
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* references. If it does not exist, return NULL.
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*/
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static struct ref_entry *get_packed_ref(struct packed_ref_store *refs,
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const char *refname)
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{
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return find_ref_entry(get_packed_refs(refs), refname);
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}
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2017-06-23 07:01:38 +00:00
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static int packed_read_raw_ref(struct ref_store *ref_store,
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const char *refname, unsigned char *sha1,
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struct strbuf *referent, unsigned int *type)
|
2017-06-23 07:01:37 +00:00
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_READ, "read_raw_ref");
|
|
|
|
|
2017-06-23 07:01:37 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
static int packed_peel_ref(struct ref_store *ref_store,
|
|
|
|
const char *refname, unsigned char *sha1)
|
2017-06-23 07:01:37 +00:00
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_READ | REF_STORE_ODB,
|
|
|
|
"peel_ref");
|
2017-06-23 07:01:37 +00:00
|
|
|
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
|
|
|
|
};
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
static struct ref_iterator *packed_ref_iterator_begin(
|
|
|
|
struct ref_store *ref_store,
|
2017-06-23 07:01:37 +00:00
|
|
|
const char *prefix, unsigned int flags)
|
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs;
|
2017-06-23 07:01:37 +00:00
|
|
|
struct packed_ref_iterator *iter;
|
|
|
|
struct ref_iterator *ref_iterator;
|
2017-06-23 07:01:38 +00:00
|
|
|
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");
|
2017-06-23 07:01:37 +00:00
|
|
|
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
static void write_packed_entry(FILE *fh, const char *refname,
|
|
|
|
const unsigned char *sha1,
|
|
|
|
const unsigned char *peeled)
|
|
|
|
{
|
|
|
|
fprintf_or_die(fh, "%s %s\n", sha1_to_hex(sha1), refname);
|
|
|
|
if (peeled)
|
|
|
|
fprintf_or_die(fh, "^%s\n", sha1_to_hex(peeled));
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
int lock_packed_refs(struct ref_store *ref_store, int flags)
|
2017-06-23 07:01:37 +00:00
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
|
|
|
|
"lock_packed_refs");
|
2017-06-23 07:01:37 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (hold_lock_file_for_update_timeout(
|
|
|
|
&refs->lock,
|
|
|
|
refs->path,
|
|
|
|
flags, timeout_value) < 0)
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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
|
|
|
|
* lock_packed_refs()). Return zero on success. On errors, set errno
|
|
|
|
* and return a nonzero value.
|
|
|
|
*/
|
2017-06-23 07:01:38 +00:00
|
|
|
int commit_packed_refs(struct ref_store *ref_store)
|
2017-06-23 07:01:37 +00:00
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
|
|
|
|
"commit_packed_refs");
|
2017-06-23 07:01:37 +00:00
|
|
|
struct packed_ref_cache *packed_ref_cache =
|
|
|
|
get_packed_ref_cache(refs);
|
|
|
|
int ok, error = 0;
|
|
|
|
int save_errno = 0;
|
|
|
|
FILE *out;
|
|
|
|
struct ref_iterator *iter;
|
|
|
|
|
|
|
|
if (!is_lock_file_locked(&refs->lock))
|
|
|
|
die("BUG: packed-refs not locked");
|
|
|
|
|
|
|
|
out = fdopen_lock_file(&refs->lock, "w");
|
|
|
|
if (!out)
|
|
|
|
die_errno("unable to fdopen packed-refs descriptor");
|
|
|
|
|
|
|
|
fprintf_or_die(out, "%s", PACKED_REFS_HEADER);
|
|
|
|
|
|
|
|
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);
|
|
|
|
|
|
|
|
write_packed_entry(out, iter->refname, iter->oid->hash,
|
|
|
|
peel_error ? NULL : peeled.hash);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ok != ITER_DONE)
|
|
|
|
die("error while iterating over references");
|
|
|
|
|
|
|
|
if (commit_lock_file(&refs->lock)) {
|
|
|
|
save_errno = errno;
|
|
|
|
error = -1;
|
|
|
|
}
|
|
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
|
|
errno = save_errno;
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Rollback the lockfile for the packed-refs file, and discard the
|
|
|
|
* in-memory packed reference cache. (The packed-refs file will be
|
|
|
|
* read anew if it is needed again after this function is called.)
|
|
|
|
*/
|
|
|
|
static void rollback_packed_refs(struct packed_ref_store *refs)
|
|
|
|
{
|
|
|
|
struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs);
|
|
|
|
|
|
|
|
packed_assert_main_repository(refs, "rollback_packed_refs");
|
|
|
|
|
|
|
|
if (!is_lock_file_locked(&refs->lock))
|
|
|
|
die("BUG: packed-refs not locked");
|
|
|
|
rollback_lock_file(&refs->lock);
|
|
|
|
release_packed_ref_cache(packed_ref_cache);
|
|
|
|
clear_packed_ref_cache(refs);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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 refs in 'refnames' needn't be sorted. `err` must not be NULL.
|
|
|
|
*/
|
2017-06-23 07:01:38 +00:00
|
|
|
int repack_without_refs(struct ref_store *ref_store,
|
2017-06-23 07:01:37 +00:00
|
|
|
struct string_list *refnames, struct strbuf *err)
|
|
|
|
{
|
2017-06-23 07:01:38 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_WRITE | REF_STORE_MAIN,
|
|
|
|
"repack_without_refs");
|
2017-06-23 07:01:37 +00:00
|
|
|
struct ref_dir *packed;
|
|
|
|
struct string_list_item *refname;
|
|
|
|
int ret, needs_repacking = 0, removed = 0;
|
|
|
|
|
|
|
|
packed_assert_main_repository(refs, "repack_without_refs");
|
|
|
|
assert(err);
|
|
|
|
|
|
|
|
/* 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 */
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
if (lock_packed_refs(&refs->base, 0)) {
|
2017-06-23 07:01:37 +00:00
|
|
|
unable_to_lock_message(refs->path, errno, err);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
rollback_packed_refs(refs);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Write what remains */
|
2017-06-23 07:01:38 +00:00
|
|
|
ret = commit_packed_refs(&refs->base);
|
2017-06-23 07:01:37 +00:00
|
|
|
if (ret)
|
|
|
|
strbuf_addf(err, "unable to overwrite old ref-pack file: %s",
|
|
|
|
strerror(errno));
|
|
|
|
return ret;
|
|
|
|
}
|
2017-06-23 07:01:38 +00:00
|
|
|
|
|
|
|
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 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_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
|
|
|
|
};
|