2017-06-23 07:01:37 +00:00
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#include "../cache.h"
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2017-08-22 17:29:16 +00:00
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#include "../config.h"
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2017-06-23 07:01:37 +00:00
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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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2017-09-13 17:15:57 +00:00
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struct packed_ref_store;
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2017-06-23 07:01:37 +00:00
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struct packed_ref_cache {
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2017-09-13 17:15:57 +00:00
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/*
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* A back-pointer to the packed_ref_store with which this
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* cache is associated:
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*/
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struct packed_ref_store *refs;
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2017-06-23 07:01:37 +00:00
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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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2017-06-23 07:01:40 +00:00
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/*
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* Temporary file used when rewriting new contents to the
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* "packed-refs" file. Note that this (and thus the enclosing
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* `packed_ref_store`) must not be freed.
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*/
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struct tempfile tempfile;
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2017-06-23 07:01:37 +00:00
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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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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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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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2017-09-13 17:15:58 +00:00
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static NORETURN void die_unterminated_line(const char *path,
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const char *p, size_t len)
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{
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if (len < 80)
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die("unterminated line in %s: %.*s", path, (int)len, p);
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else
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die("unterminated line in %s: %.75s...", path, p);
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}
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static NORETURN void die_invalid_line(const char *path,
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const char *p, size_t len)
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{
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const char *eol = memchr(p, '\n', len);
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if (!eol)
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die_unterminated_line(path, p, len);
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else if (eol - p < 80)
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die("unexpected line in %s: %.*s", path, (int)(eol - p), p);
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else
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die("unexpected line in %s: %.75s...", path, p);
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}
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2017-06-23 07:01:37 +00:00
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/*
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2017-09-13 17:15:57 +00:00
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* Read from the `packed-refs` file into a newly-allocated
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2017-06-23 07:01:37 +00:00
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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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2017-09-13 17:15:57 +00:00
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static struct packed_ref_cache *read_packed_refs(struct packed_ref_store *refs)
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2017-06-23 07:01:37 +00:00
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{
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struct packed_ref_cache *packed_refs = xcalloc(1, sizeof(*packed_refs));
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2017-09-13 17:15:59 +00:00
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int fd;
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struct stat st;
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size_t size;
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char *buf;
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const char *pos, *eol, *eof;
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2017-06-23 07:01:37 +00:00
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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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2017-09-13 17:15:57 +00:00
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packed_refs->refs = refs;
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2017-06-23 07:01:37 +00:00
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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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2017-09-13 17:15:59 +00:00
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fd = open(refs->path, O_RDONLY);
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if (fd < 0) {
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2017-06-23 07:01:37 +00:00
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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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2017-09-13 17:15:57 +00:00
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die_errno("couldn't read %s", refs->path);
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2017-06-23 07:01:37 +00:00
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}
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}
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2017-09-13 17:15:59 +00:00
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stat_validity_update(&packed_refs->validity, fd);
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if (fstat(fd, &st) < 0)
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die_errno("couldn't stat %s", refs->path);
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size = xsize_t(st.st_size);
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buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
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pos = buf;
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eof = buf + size;
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2017-06-23 07:01:37 +00:00
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2017-09-13 17:16:00 +00:00
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/* If the file has a header line, process it: */
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if (pos < eof && *pos == '#') {
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const char *traits;
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eol = memchr(pos, '\n', eof - pos);
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if (!eol)
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die_unterminated_line(refs->path, pos, eof - pos);
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strbuf_add(&line, pos, eol + 1 - pos);
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if (!skip_prefix(line.buf, "# pack-refs with:", &traits))
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die_invalid_line(refs->path, pos, eof - pos);
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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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/* The "+ 1" is for the LF character. */
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pos = eol + 1;
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strbuf_reset(&line);
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}
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2017-06-23 07:01:37 +00:00
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dir = get_ref_dir(packed_refs->cache->root);
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2017-09-13 17:15:59 +00:00
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while (pos < eof) {
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2017-06-23 07:01:37 +00:00
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struct object_id oid;
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const char *refname;
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2017-09-13 17:15:59 +00:00
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eol = memchr(pos, '\n', eof - pos);
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if (!eol)
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die_unterminated_line(refs->path, pos, eof - pos);
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strbuf_add(&line, pos, eol + 1 - pos);
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2017-07-01 18:31:08 +00:00
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2017-06-23 07:01:37 +00:00
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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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2017-07-01 18:31:08 +00:00
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} else if (last &&
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2017-06-23 07:01:37 +00:00
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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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2017-07-01 18:31:08 +00:00
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} else {
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2017-09-13 17:15:58 +00:00
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die_invalid_line(refs->path, line.buf, line.len);
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2017-06-23 07:01:37 +00:00
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}
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2017-09-13 17:15:59 +00:00
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/* The "+ 1" is for the LF character. */
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pos = eol + 1;
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strbuf_reset(&line);
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2017-06-23 07:01:37 +00:00
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}
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2017-09-13 17:15:59 +00:00
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if (munmap(buf, size))
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die_errno("error ummapping packed-refs file");
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close(fd);
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2017-06-23 07:01:37 +00:00
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2017-09-13 17:15:59 +00:00
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strbuf_release(&line);
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2017-06-23 07:01:37 +00:00
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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
|
|
|
|
* 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)
|
2017-09-13 17:15:57 +00:00
|
|
|
refs->cache = read_packed_refs(refs);
|
2017-06-23 07:01:37 +00:00
|
|
|
|
|
|
|
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));
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
static int packed_read_raw_ref(struct ref_store *ref_store,
|
|
|
|
const char *refname, unsigned char *sha1,
|
|
|
|
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;
|
2017-09-13 17:15:55 +00:00
|
|
|
base_ref_iterator_init(ref_iterator, &packed_ref_iterator_vtable, 1);
|
2017-06-23 07:01:37 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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.
|
2017-06-23 07:01:39 +00:00
|
|
|
* 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()`.
|
2017-06-23 07:01:37 +00:00
|
|
|
*/
|
2017-06-23 07:01:39 +00:00
|
|
|
static int write_packed_entry(FILE *fh, const char *refname,
|
|
|
|
const unsigned char *sha1,
|
|
|
|
const unsigned char *peeled)
|
2017-06-23 07:01:37 +00:00
|
|
|
{
|
2017-06-23 07:01:39 +00:00
|
|
|
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;
|
2017-06-23 07:01:37 +00:00
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:42 +00:00
|
|
|
int packed_refs_lock(struct ref_store *ref_store, int flags, struct strbuf *err)
|
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,
|
2017-06-23 07:01:41 +00:00
|
|
|
"packed_refs_lock");
|
2017-06-23 07:01:37 +00:00
|
|
|
static int timeout_configured = 0;
|
|
|
|
static int timeout_value = 1000;
|
|
|
|
|
|
|
|
if (!timeout_configured) {
|
|
|
|
git_config_get_int("core.packedrefstimeout", &timeout_value);
|
|
|
|
timeout_configured = 1;
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:40 +00:00
|
|
|
/*
|
|
|
|
* Note that we close the lockfile immediately because we
|
|
|
|
* don't write new content to it, but rather to a separate
|
|
|
|
* tempfile.
|
|
|
|
*/
|
2017-06-23 07:01:37 +00:00
|
|
|
if (hold_lock_file_for_update_timeout(
|
|
|
|
&refs->lock,
|
|
|
|
refs->path,
|
2017-06-23 07:01:42 +00:00
|
|
|
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));
|
2017-06-23 07:01:37 +00:00
|
|
|
return -1;
|
2017-06-23 07:01:42 +00:00
|
|
|
}
|
2017-06-23 07:01:37 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 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);
|
|
|
|
|
2017-09-08 13:51:43 +00:00
|
|
|
/*
|
|
|
|
* Now make sure that the packed-refs file as it exists in the
|
|
|
|
* locked state is loaded into the cache:
|
|
|
|
*/
|
|
|
|
get_packed_ref_cache(refs);
|
2017-06-23 07:01:37 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:43 +00:00
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
|
|
|
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);
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:37 +00:00
|
|
|
/*
|
|
|
|
* 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";
|
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2017-09-08 13:51:45 +00:00
|
|
|
/*
|
|
|
|
* Write the packed-refs from the cache to the packed-refs tempfile,
|
|
|
|
* incorporating any changes from `updates`. `updates` must be a
|
|
|
|
* sorted string list whose keys are the refnames and whose util
|
|
|
|
* values are `struct ref_update *`. On error, rollback the tempfile,
|
|
|
|
* write an error message to `err`, and return a nonzero value.
|
|
|
|
*
|
|
|
|
* The packfile must be locked before calling this function and will
|
|
|
|
* remain locked when it is done.
|
|
|
|
*/
|
|
|
|
static int write_with_updates(struct packed_ref_store *refs,
|
|
|
|
struct string_list *updates,
|
|
|
|
struct strbuf *err)
|
|
|
|
{
|
|
|
|
struct ref_iterator *iter = NULL;
|
|
|
|
size_t i;
|
|
|
|
int ok;
|
|
|
|
FILE *out;
|
|
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
char *packed_refs_path;
|
|
|
|
|
|
|
|
if (!is_lock_file_locked(&refs->lock))
|
|
|
|
die("BUG: write_with_updates() called while unlocked");
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If packed-refs is a symlink, we want to overwrite the
|
|
|
|
* symlinked-to file, not the symlink itself. Also, put the
|
|
|
|
* staging file next to it:
|
|
|
|
*/
|
|
|
|
packed_refs_path = get_locked_file_path(&refs->lock);
|
|
|
|
strbuf_addf(&sb, "%s.new", packed_refs_path);
|
|
|
|
free(packed_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)
|
|
|
|
goto write_error;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We iterate in parallel through the current list of refs and
|
|
|
|
* the list of updates, processing an entry from at least one
|
|
|
|
* of the lists each time through the loop. When the current
|
|
|
|
* list of refs is exhausted, set iter to NULL. When the list
|
|
|
|
* of updates is exhausted, leave i set to updates->nr.
|
|
|
|
*/
|
|
|
|
iter = packed_ref_iterator_begin(&refs->base, "",
|
|
|
|
DO_FOR_EACH_INCLUDE_BROKEN);
|
|
|
|
if ((ok = ref_iterator_advance(iter)) != ITER_OK)
|
|
|
|
iter = NULL;
|
|
|
|
|
|
|
|
i = 0;
|
|
|
|
|
|
|
|
while (iter || i < updates->nr) {
|
|
|
|
struct ref_update *update = NULL;
|
|
|
|
int cmp;
|
|
|
|
|
|
|
|
if (i >= updates->nr) {
|
|
|
|
cmp = -1;
|
|
|
|
} else {
|
|
|
|
update = updates->items[i].util;
|
|
|
|
|
|
|
|
if (!iter)
|
|
|
|
cmp = +1;
|
|
|
|
else
|
|
|
|
cmp = strcmp(iter->refname, update->refname);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!cmp) {
|
|
|
|
/*
|
|
|
|
* There is both an old value and an update
|
|
|
|
* for this reference. Check the old value if
|
|
|
|
* necessary:
|
|
|
|
*/
|
|
|
|
if ((update->flags & REF_HAVE_OLD)) {
|
|
|
|
if (is_null_oid(&update->old_oid)) {
|
|
|
|
strbuf_addf(err, "cannot update ref '%s': "
|
|
|
|
"reference already exists",
|
|
|
|
update->refname);
|
|
|
|
goto error;
|
|
|
|
} else if (oidcmp(&update->old_oid, iter->oid)) {
|
|
|
|
strbuf_addf(err, "cannot update ref '%s': "
|
|
|
|
"is at %s but expected %s",
|
|
|
|
update->refname,
|
|
|
|
oid_to_hex(iter->oid),
|
|
|
|
oid_to_hex(&update->old_oid));
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Now figure out what to use for the new value: */
|
|
|
|
if ((update->flags & REF_HAVE_NEW)) {
|
|
|
|
/*
|
|
|
|
* The update takes precedence. Skip
|
|
|
|
* the iterator over the unneeded
|
|
|
|
* value.
|
|
|
|
*/
|
|
|
|
if ((ok = ref_iterator_advance(iter)) != ITER_OK)
|
|
|
|
iter = NULL;
|
|
|
|
cmp = +1;
|
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* The update doesn't actually want to
|
|
|
|
* change anything. We're done with it.
|
|
|
|
*/
|
|
|
|
i++;
|
|
|
|
cmp = -1;
|
|
|
|
}
|
|
|
|
} else if (cmp > 0) {
|
|
|
|
/*
|
|
|
|
* There is no old value but there is an
|
|
|
|
* update for this reference. Make sure that
|
|
|
|
* the update didn't expect an existing value:
|
|
|
|
*/
|
|
|
|
if ((update->flags & REF_HAVE_OLD) &&
|
|
|
|
!is_null_oid(&update->old_oid)) {
|
|
|
|
strbuf_addf(err, "cannot update ref '%s': "
|
|
|
|
"reference is missing but expected %s",
|
|
|
|
update->refname,
|
|
|
|
oid_to_hex(&update->old_oid));
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (cmp < 0) {
|
|
|
|
/* Pass the old reference through. */
|
|
|
|
|
|
|
|
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))
|
|
|
|
goto write_error;
|
|
|
|
|
|
|
|
if ((ok = ref_iterator_advance(iter)) != ITER_OK)
|
|
|
|
iter = NULL;
|
|
|
|
} else if (is_null_oid(&update->new_oid)) {
|
|
|
|
/*
|
|
|
|
* The update wants to delete the reference,
|
|
|
|
* and the reference either didn't exist or we
|
|
|
|
* have already skipped it. So we're done with
|
|
|
|
* the update (and don't have to write
|
|
|
|
* anything).
|
|
|
|
*/
|
|
|
|
i++;
|
|
|
|
} else {
|
|
|
|
struct object_id peeled;
|
|
|
|
int peel_error = peel_object(update->new_oid.hash,
|
|
|
|
peeled.hash);
|
|
|
|
|
|
|
|
if (write_packed_entry(out, update->refname,
|
|
|
|
update->new_oid.hash,
|
|
|
|
peel_error ? NULL : peeled.hash))
|
|
|
|
goto write_error;
|
|
|
|
|
|
|
|
i++;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (ok != ITER_DONE) {
|
|
|
|
strbuf_addf(err, "unable to write packed-refs file: "
|
|
|
|
"error iterating over old contents");
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (close_tempfile(&refs->tempfile)) {
|
|
|
|
strbuf_addf(err, "error closing file %s: %s",
|
|
|
|
get_tempfile_path(&refs->tempfile),
|
|
|
|
strerror(errno));
|
|
|
|
strbuf_release(&sb);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
write_error:
|
|
|
|
strbuf_addf(err, "error writing to %s: %s",
|
|
|
|
get_tempfile_path(&refs->tempfile), strerror(errno));
|
|
|
|
|
|
|
|
error:
|
|
|
|
if (iter)
|
|
|
|
ref_iterator_abort(iter);
|
|
|
|
|
|
|
|
delete_tempfile(&refs->tempfile);
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
struct packed_transaction_backend_data {
|
|
|
|
/* True iff the transaction owns the packed-refs lock. */
|
|
|
|
int own_lock;
|
|
|
|
|
|
|
|
struct string_list updates;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void packed_transaction_cleanup(struct packed_ref_store *refs,
|
|
|
|
struct ref_transaction *transaction)
|
|
|
|
{
|
|
|
|
struct packed_transaction_backend_data *data = transaction->backend_data;
|
|
|
|
|
|
|
|
if (data) {
|
|
|
|
string_list_clear(&data->updates, 0);
|
|
|
|
|
|
|
|
if (is_tempfile_active(&refs->tempfile))
|
|
|
|
delete_tempfile(&refs->tempfile);
|
|
|
|
|
|
|
|
if (data->own_lock && is_lock_file_locked(&refs->lock)) {
|
|
|
|
packed_refs_unlock(&refs->base);
|
|
|
|
data->own_lock = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
free(data);
|
|
|
|
transaction->backend_data = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
transaction->state = REF_TRANSACTION_CLOSED;
|
|
|
|
}
|
|
|
|
|
2017-06-23 07:01:38 +00:00
|
|
|
static int packed_transaction_prepare(struct ref_store *ref_store,
|
|
|
|
struct ref_transaction *transaction,
|
|
|
|
struct strbuf *err)
|
|
|
|
{
|
2017-09-08 13:51:45 +00:00
|
|
|
struct packed_ref_store *refs = packed_downcast(
|
|
|
|
ref_store,
|
|
|
|
REF_STORE_READ | REF_STORE_WRITE | REF_STORE_ODB,
|
|
|
|
"ref_transaction_prepare");
|
|
|
|
struct packed_transaction_backend_data *data;
|
|
|
|
size_t i;
|
|
|
|
int ret = TRANSACTION_GENERIC_ERROR;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Note that we *don't* skip transactions with zero updates,
|
|
|
|
* because such a transaction might be executed for the side
|
|
|
|
* effect of ensuring that all of the references are peeled.
|
|
|
|
* If the caller wants to optimize away empty transactions, it
|
|
|
|
* should do so itself.
|
|
|
|
*/
|
|
|
|
|
|
|
|
data = xcalloc(1, sizeof(*data));
|
|
|
|
string_list_init(&data->updates, 0);
|
|
|
|
|
|
|
|
transaction->backend_data = data;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Stick the updates in a string list by refname so that we
|
|
|
|
* can sort them:
|
|
|
|
*/
|
|
|
|
for (i = 0; i < transaction->nr; i++) {
|
|
|
|
struct ref_update *update = transaction->updates[i];
|
|
|
|
struct string_list_item *item =
|
|
|
|
string_list_append(&data->updates, update->refname);
|
|
|
|
|
|
|
|
/* Store a pointer to update in item->util: */
|
|
|
|
item->util = update;
|
|
|
|
}
|
|
|
|
string_list_sort(&data->updates);
|
|
|
|
|
|
|
|
if (ref_update_reject_duplicates(&data->updates, err))
|
|
|
|
goto failure;
|
|
|
|
|
|
|
|
if (!is_lock_file_locked(&refs->lock)) {
|
|
|
|
if (packed_refs_lock(ref_store, 0, err))
|
|
|
|
goto failure;
|
|
|
|
data->own_lock = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (write_with_updates(refs, &data->updates, err))
|
|
|
|
goto failure;
|
|
|
|
|
|
|
|
transaction->state = REF_TRANSACTION_PREPARED;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
failure:
|
|
|
|
packed_transaction_cleanup(refs, transaction);
|
|
|
|
return ret;
|
2017-06-23 07:01:38 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int packed_transaction_abort(struct ref_store *ref_store,
|
|
|
|
struct ref_transaction *transaction,
|
|
|
|
struct strbuf *err)
|
|
|
|
{
|
2017-09-08 13:51:45 +00:00
|
|
|
struct packed_ref_store *refs = packed_downcast(
|
|
|
|
ref_store,
|
|
|
|
REF_STORE_READ | REF_STORE_WRITE | REF_STORE_ODB,
|
|
|
|
"ref_transaction_abort");
|
|
|
|
|
|
|
|
packed_transaction_cleanup(refs, transaction);
|
|
|
|
return 0;
|
2017-06-23 07:01:38 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int packed_transaction_finish(struct ref_store *ref_store,
|
|
|
|
struct ref_transaction *transaction,
|
|
|
|
struct strbuf *err)
|
|
|
|
{
|
2017-09-08 13:51:45 +00:00
|
|
|
struct packed_ref_store *refs = packed_downcast(
|
|
|
|
ref_store,
|
|
|
|
REF_STORE_READ | REF_STORE_WRITE | REF_STORE_ODB,
|
|
|
|
"ref_transaction_finish");
|
|
|
|
int ret = TRANSACTION_GENERIC_ERROR;
|
|
|
|
char *packed_refs_path;
|
|
|
|
|
|
|
|
packed_refs_path = get_locked_file_path(&refs->lock);
|
|
|
|
if (rename_tempfile(&refs->tempfile, packed_refs_path)) {
|
|
|
|
strbuf_addf(err, "error replacing %s: %s",
|
|
|
|
refs->path, strerror(errno));
|
|
|
|
goto cleanup;
|
|
|
|
}
|
|
|
|
|
|
|
|
clear_packed_ref_cache(refs);
|
|
|
|
ret = 0;
|
|
|
|
|
|
|
|
cleanup:
|
|
|
|
free(packed_refs_path);
|
|
|
|
packed_transaction_cleanup(refs, transaction);
|
|
|
|
return ret;
|
2017-06-23 07:01:38 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2017-09-08 13:51:46 +00:00
|
|
|
struct packed_ref_store *refs =
|
|
|
|
packed_downcast(ref_store, REF_STORE_WRITE, "delete_refs");
|
|
|
|
struct strbuf err = STRBUF_INIT;
|
|
|
|
struct ref_transaction *transaction;
|
|
|
|
struct string_list_item *item;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
(void)refs; /* We need the check above, but don't use the variable */
|
|
|
|
|
|
|
|
if (!refnames->nr)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Since we don't check the references' old_oids, the
|
|
|
|
* individual updates can't fail, so we can pack all of the
|
|
|
|
* updates into a single transaction.
|
|
|
|
*/
|
|
|
|
|
|
|
|
transaction = ref_store_transaction_begin(ref_store, &err);
|
|
|
|
if (!transaction)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
for_each_string_list_item(item, refnames) {
|
|
|
|
if (ref_transaction_delete(transaction, item->string, NULL,
|
|
|
|
flags, msg, &err)) {
|
|
|
|
warning(_("could not delete reference %s: %s"),
|
|
|
|
item->string, err.buf);
|
|
|
|
strbuf_reset(&err);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
ret = ref_transaction_commit(transaction, &err);
|
|
|
|
|
|
|
|
if (ret) {
|
|
|
|
if (refnames->nr == 1)
|
|
|
|
error(_("could not delete reference %s: %s"),
|
|
|
|
refnames->items[0].string, err.buf);
|
|
|
|
else
|
|
|
|
error(_("could not delete references: %s"), err.buf);
|
|
|
|
}
|
|
|
|
|
|
|
|
ref_transaction_free(transaction);
|
|
|
|
strbuf_release(&err);
|
|
|
|
return ret;
|
2017-06-23 07:01:38 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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
|
|
|
|
};
|