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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:34:27 +0000
commit4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f (patch)
tree47c1d492e9c956c1cd2b74dbd3b9d8b0db44dc4e /packfile.c
parentInitial commit. (diff)
downloadgit-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.tar.xz
git-4dbdc42d9e7c3968ff7f690d00680419c9b8cb0f.zip
Adding upstream version 1:2.43.0.upstream/1%2.43.0
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'packfile.c')
-rw-r--r--packfile.c2292
1 files changed, 2292 insertions, 0 deletions
diff --git a/packfile.c b/packfile.c
new file mode 100644
index 0000000..9cc0a2e
--- /dev/null
+++ b/packfile.c
@@ -0,0 +1,2292 @@
+#include "git-compat-util.h"
+#include "environment.h"
+#include "gettext.h"
+#include "hex.h"
+#include "list.h"
+#include "pack.h"
+#include "repository.h"
+#include "dir.h"
+#include "mergesort.h"
+#include "packfile.h"
+#include "delta.h"
+#include "streaming.h"
+#include "hash-lookup.h"
+#include "commit.h"
+#include "object.h"
+#include "tag.h"
+#include "trace.h"
+#include "tree-walk.h"
+#include "tree.h"
+#include "object-file.h"
+#include "object-store-ll.h"
+#include "midx.h"
+#include "commit-graph.h"
+#include "pack-revindex.h"
+#include "promisor-remote.h"
+
+char *odb_pack_name(struct strbuf *buf,
+ const unsigned char *hash,
+ const char *ext)
+{
+ strbuf_reset(buf);
+ strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
+ hash_to_hex(hash), ext);
+ return buf->buf;
+}
+
+char *sha1_pack_name(const unsigned char *sha1)
+{
+ static struct strbuf buf = STRBUF_INIT;
+ return odb_pack_name(&buf, sha1, "pack");
+}
+
+char *sha1_pack_index_name(const unsigned char *sha1)
+{
+ static struct strbuf buf = STRBUF_INIT;
+ return odb_pack_name(&buf, sha1, "idx");
+}
+
+static unsigned int pack_used_ctr;
+static unsigned int pack_mmap_calls;
+static unsigned int peak_pack_open_windows;
+static unsigned int pack_open_windows;
+static unsigned int pack_open_fds;
+static unsigned int pack_max_fds;
+static size_t peak_pack_mapped;
+static size_t pack_mapped;
+
+#define SZ_FMT PRIuMAX
+static inline uintmax_t sz_fmt(size_t s) { return s; }
+
+void pack_report(void)
+{
+ fprintf(stderr,
+ "pack_report: getpagesize() = %10" SZ_FMT "\n"
+ "pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
+ "pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
+ sz_fmt(getpagesize()),
+ sz_fmt(packed_git_window_size),
+ sz_fmt(packed_git_limit));
+ fprintf(stderr,
+ "pack_report: pack_used_ctr = %10u\n"
+ "pack_report: pack_mmap_calls = %10u\n"
+ "pack_report: pack_open_windows = %10u / %10u\n"
+ "pack_report: pack_mapped = "
+ "%10" SZ_FMT " / %10" SZ_FMT "\n",
+ pack_used_ctr,
+ pack_mmap_calls,
+ pack_open_windows, peak_pack_open_windows,
+ sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
+}
+
+/*
+ * Open and mmap the index file at path, perform a couple of
+ * consistency checks, then record its information to p. Return 0 on
+ * success.
+ */
+static int check_packed_git_idx(const char *path, struct packed_git *p)
+{
+ void *idx_map;
+ size_t idx_size;
+ int fd = git_open(path), ret;
+ struct stat st;
+ const unsigned int hashsz = the_hash_algo->rawsz;
+
+ if (fd < 0)
+ return -1;
+ if (fstat(fd, &st)) {
+ close(fd);
+ return -1;
+ }
+ idx_size = xsize_t(st.st_size);
+ if (idx_size < 4 * 256 + hashsz + hashsz) {
+ close(fd);
+ return error("index file %s is too small", path);
+ }
+ idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
+ close(fd);
+
+ ret = load_idx(path, hashsz, idx_map, idx_size, p);
+
+ if (ret)
+ munmap(idx_map, idx_size);
+
+ return ret;
+}
+
+int load_idx(const char *path, const unsigned int hashsz, void *idx_map,
+ size_t idx_size, struct packed_git *p)
+{
+ struct pack_idx_header *hdr = idx_map;
+ uint32_t version, nr, i, *index;
+
+ if (idx_size < 4 * 256 + hashsz + hashsz)
+ return error("index file %s is too small", path);
+ if (!idx_map)
+ return error("empty data");
+
+ if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
+ version = ntohl(hdr->idx_version);
+ if (version < 2 || version > 2)
+ return error("index file %s is version %"PRIu32
+ " and is not supported by this binary"
+ " (try upgrading GIT to a newer version)",
+ path, version);
+ } else
+ version = 1;
+
+ nr = 0;
+ index = idx_map;
+ if (version > 1)
+ index += 2; /* skip index header */
+ for (i = 0; i < 256; i++) {
+ uint32_t n = ntohl(index[i]);
+ if (n < nr)
+ return error("non-monotonic index %s", path);
+ nr = n;
+ }
+
+ if (version == 1) {
+ /*
+ * Total size:
+ * - 256 index entries 4 bytes each
+ * - 24-byte entries * nr (object ID + 4-byte offset)
+ * - hash of the packfile
+ * - file checksum
+ */
+ if (idx_size != st_add(4 * 256 + hashsz + hashsz, st_mult(nr, hashsz + 4)))
+ return error("wrong index v1 file size in %s", path);
+ } else if (version == 2) {
+ /*
+ * Minimum size:
+ * - 8 bytes of header
+ * - 256 index entries 4 bytes each
+ * - object ID entry * nr
+ * - 4-byte crc entry * nr
+ * - 4-byte offset entry * nr
+ * - hash of the packfile
+ * - file checksum
+ * And after the 4-byte offset table might be a
+ * variable sized table containing 8-byte entries
+ * for offsets larger than 2^31.
+ */
+ size_t min_size = st_add(8 + 4*256 + hashsz + hashsz, st_mult(nr, hashsz + 4 + 4));
+ size_t max_size = min_size;
+ if (nr)
+ max_size = st_add(max_size, st_mult(nr - 1, 8));
+ if (idx_size < min_size || idx_size > max_size)
+ return error("wrong index v2 file size in %s", path);
+ if (idx_size != min_size &&
+ /*
+ * make sure we can deal with large pack offsets.
+ * 31-bit signed offset won't be enough, neither
+ * 32-bit unsigned one will be.
+ */
+ (sizeof(off_t) <= 4))
+ return error("pack too large for current definition of off_t in %s", path);
+ p->crc_offset = st_add(8 + 4 * 256, st_mult(nr, hashsz));
+ }
+
+ p->index_version = version;
+ p->index_data = idx_map;
+ p->index_size = idx_size;
+ p->num_objects = nr;
+ return 0;
+}
+
+int open_pack_index(struct packed_git *p)
+{
+ char *idx_name;
+ size_t len;
+ int ret;
+
+ if (p->index_data)
+ return 0;
+
+ if (!strip_suffix(p->pack_name, ".pack", &len))
+ BUG("pack_name does not end in .pack");
+ idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
+ ret = check_packed_git_idx(idx_name, p);
+ free(idx_name);
+ return ret;
+}
+
+uint32_t get_pack_fanout(struct packed_git *p, uint32_t value)
+{
+ const uint32_t *level1_ofs = p->index_data;
+
+ if (!level1_ofs) {
+ if (open_pack_index(p))
+ return 0;
+ level1_ofs = p->index_data;
+ }
+
+ if (p->index_version > 1) {
+ level1_ofs += 2;
+ }
+
+ return ntohl(level1_ofs[value]);
+}
+
+static struct packed_git *alloc_packed_git(int extra)
+{
+ struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
+ memset(p, 0, sizeof(*p));
+ p->pack_fd = -1;
+ return p;
+}
+
+struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
+{
+ const char *path = sha1_pack_name(sha1);
+ size_t alloc = st_add(strlen(path), 1);
+ struct packed_git *p = alloc_packed_git(alloc);
+
+ memcpy(p->pack_name, path, alloc); /* includes NUL */
+ hashcpy(p->hash, sha1);
+ if (check_packed_git_idx(idx_path, p)) {
+ free(p);
+ return NULL;
+ }
+
+ return p;
+}
+
+static void scan_windows(struct packed_git *p,
+ struct packed_git **lru_p,
+ struct pack_window **lru_w,
+ struct pack_window **lru_l)
+{
+ struct pack_window *w, *w_l;
+
+ for (w_l = NULL, w = p->windows; w; w = w->next) {
+ if (!w->inuse_cnt) {
+ if (!*lru_w || w->last_used < (*lru_w)->last_used) {
+ *lru_p = p;
+ *lru_w = w;
+ *lru_l = w_l;
+ }
+ }
+ w_l = w;
+ }
+}
+
+static int unuse_one_window(struct packed_git *current)
+{
+ struct packed_git *p, *lru_p = NULL;
+ struct pack_window *lru_w = NULL, *lru_l = NULL;
+
+ if (current)
+ scan_windows(current, &lru_p, &lru_w, &lru_l);
+ for (p = the_repository->objects->packed_git; p; p = p->next)
+ scan_windows(p, &lru_p, &lru_w, &lru_l);
+ if (lru_p) {
+ munmap(lru_w->base, lru_w->len);
+ pack_mapped -= lru_w->len;
+ if (lru_l)
+ lru_l->next = lru_w->next;
+ else
+ lru_p->windows = lru_w->next;
+ free(lru_w);
+ pack_open_windows--;
+ return 1;
+ }
+ return 0;
+}
+
+void close_pack_windows(struct packed_git *p)
+{
+ while (p->windows) {
+ struct pack_window *w = p->windows;
+
+ if (w->inuse_cnt)
+ die("pack '%s' still has open windows to it",
+ p->pack_name);
+ munmap(w->base, w->len);
+ pack_mapped -= w->len;
+ pack_open_windows--;
+ p->windows = w->next;
+ free(w);
+ }
+}
+
+int close_pack_fd(struct packed_git *p)
+{
+ if (p->pack_fd < 0)
+ return 0;
+
+ close(p->pack_fd);
+ pack_open_fds--;
+ p->pack_fd = -1;
+
+ return 1;
+}
+
+void close_pack_index(struct packed_git *p)
+{
+ if (p->index_data) {
+ munmap((void *)p->index_data, p->index_size);
+ p->index_data = NULL;
+ }
+}
+
+static void close_pack_revindex(struct packed_git *p)
+{
+ if (!p->revindex_map)
+ return;
+
+ munmap((void *)p->revindex_map, p->revindex_size);
+ p->revindex_map = NULL;
+ p->revindex_data = NULL;
+}
+
+static void close_pack_mtimes(struct packed_git *p)
+{
+ if (!p->mtimes_map)
+ return;
+
+ munmap((void *)p->mtimes_map, p->mtimes_size);
+ p->mtimes_map = NULL;
+}
+
+void close_pack(struct packed_git *p)
+{
+ close_pack_windows(p);
+ close_pack_fd(p);
+ close_pack_index(p);
+ close_pack_revindex(p);
+ close_pack_mtimes(p);
+ oidset_clear(&p->bad_objects);
+}
+
+void close_object_store(struct raw_object_store *o)
+{
+ struct packed_git *p;
+
+ for (p = o->packed_git; p; p = p->next)
+ if (p->do_not_close)
+ BUG("want to close pack marked 'do-not-close'");
+ else
+ close_pack(p);
+
+ if (o->multi_pack_index) {
+ close_midx(o->multi_pack_index);
+ o->multi_pack_index = NULL;
+ }
+
+ close_commit_graph(o);
+}
+
+void unlink_pack_path(const char *pack_name, int force_delete)
+{
+ static const char *exts[] = {".idx", ".pack", ".rev", ".keep", ".bitmap", ".promisor", ".mtimes"};
+ int i;
+ struct strbuf buf = STRBUF_INIT;
+ size_t plen;
+
+ strbuf_addstr(&buf, pack_name);
+ strip_suffix_mem(buf.buf, &buf.len, ".pack");
+ plen = buf.len;
+
+ if (!force_delete) {
+ strbuf_addstr(&buf, ".keep");
+ if (!access(buf.buf, F_OK)) {
+ strbuf_release(&buf);
+ return;
+ }
+ }
+
+ for (i = 0; i < ARRAY_SIZE(exts); i++) {
+ strbuf_setlen(&buf, plen);
+ strbuf_addstr(&buf, exts[i]);
+ unlink(buf.buf);
+ }
+
+ strbuf_release(&buf);
+}
+
+/*
+ * The LRU pack is the one with the oldest MRU window, preferring packs
+ * with no used windows, or the oldest mtime if it has no windows allocated.
+ */
+static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
+{
+ struct pack_window *w, *this_mru_w;
+ int has_windows_inuse = 0;
+
+ /*
+ * Reject this pack if it has windows and the previously selected
+ * one does not. If this pack does not have windows, reject
+ * it if the pack file is newer than the previously selected one.
+ */
+ if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
+ return;
+
+ for (w = this_mru_w = p->windows; w; w = w->next) {
+ /*
+ * Reject this pack if any of its windows are in use,
+ * but the previously selected pack did not have any
+ * inuse windows. Otherwise, record that this pack
+ * has windows in use.
+ */
+ if (w->inuse_cnt) {
+ if (*accept_windows_inuse)
+ has_windows_inuse = 1;
+ else
+ return;
+ }
+
+ if (w->last_used > this_mru_w->last_used)
+ this_mru_w = w;
+
+ /*
+ * Reject this pack if it has windows that have been
+ * used more recently than the previously selected pack.
+ * If the previously selected pack had windows inuse and
+ * we have not encountered a window in this pack that is
+ * inuse, skip this check since we prefer a pack with no
+ * inuse windows to one that has inuse windows.
+ */
+ if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
+ this_mru_w->last_used > (*mru_w)->last_used)
+ return;
+ }
+
+ /*
+ * Select this pack.
+ */
+ *mru_w = this_mru_w;
+ *lru_p = p;
+ *accept_windows_inuse = has_windows_inuse;
+}
+
+static int close_one_pack(void)
+{
+ struct packed_git *p, *lru_p = NULL;
+ struct pack_window *mru_w = NULL;
+ int accept_windows_inuse = 1;
+
+ for (p = the_repository->objects->packed_git; p; p = p->next) {
+ if (p->pack_fd == -1)
+ continue;
+ find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
+ }
+
+ if (lru_p)
+ return close_pack_fd(lru_p);
+
+ return 0;
+}
+
+static unsigned int get_max_fd_limit(void)
+{
+#ifdef RLIMIT_NOFILE
+ {
+ struct rlimit lim;
+
+ if (!getrlimit(RLIMIT_NOFILE, &lim))
+ return lim.rlim_cur;
+ }
+#endif
+
+#ifdef _SC_OPEN_MAX
+ {
+ long open_max = sysconf(_SC_OPEN_MAX);
+ if (0 < open_max)
+ return open_max;
+ /*
+ * Otherwise, we got -1 for one of the two
+ * reasons:
+ *
+ * (1) sysconf() did not understand _SC_OPEN_MAX
+ * and signaled an error with -1; or
+ * (2) sysconf() said there is no limit.
+ *
+ * We _could_ clear errno before calling sysconf() to
+ * tell these two cases apart and return a huge number
+ * in the latter case to let the caller cap it to a
+ * value that is not so selfish, but letting the
+ * fallback OPEN_MAX codepath take care of these cases
+ * is a lot simpler.
+ */
+ }
+#endif
+
+#ifdef OPEN_MAX
+ return OPEN_MAX;
+#else
+ return 1; /* see the caller ;-) */
+#endif
+}
+
+const char *pack_basename(struct packed_git *p)
+{
+ const char *ret = strrchr(p->pack_name, '/');
+ if (ret)
+ ret = ret + 1; /* skip past slash */
+ else
+ ret = p->pack_name; /* we only have a base */
+ return ret;
+}
+
+/*
+ * Do not call this directly as this leaks p->pack_fd on error return;
+ * call open_packed_git() instead.
+ */
+static int open_packed_git_1(struct packed_git *p)
+{
+ struct stat st;
+ struct pack_header hdr;
+ unsigned char hash[GIT_MAX_RAWSZ];
+ unsigned char *idx_hash;
+ ssize_t read_result;
+ const unsigned hashsz = the_hash_algo->rawsz;
+
+ if (open_pack_index(p))
+ return error("packfile %s index unavailable", p->pack_name);
+
+ if (!pack_max_fds) {
+ unsigned int max_fds = get_max_fd_limit();
+
+ /* Save 3 for stdin/stdout/stderr, 22 for work */
+ if (25 < max_fds)
+ pack_max_fds = max_fds - 25;
+ else
+ pack_max_fds = 1;
+ }
+
+ while (pack_max_fds <= pack_open_fds && close_one_pack())
+ ; /* nothing */
+
+ p->pack_fd = git_open(p->pack_name);
+ if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
+ return -1;
+ pack_open_fds++;
+
+ /* If we created the struct before we had the pack we lack size. */
+ if (!p->pack_size) {
+ if (!S_ISREG(st.st_mode))
+ return error("packfile %s not a regular file", p->pack_name);
+ p->pack_size = st.st_size;
+ } else if (p->pack_size != st.st_size)
+ return error("packfile %s size changed", p->pack_name);
+
+ /* Verify we recognize this pack file format. */
+ read_result = read_in_full(p->pack_fd, &hdr, sizeof(hdr));
+ if (read_result < 0)
+ return error_errno("error reading from %s", p->pack_name);
+ if (read_result != sizeof(hdr))
+ return error("file %s is far too short to be a packfile", p->pack_name);
+ if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
+ return error("file %s is not a GIT packfile", p->pack_name);
+ if (!pack_version_ok(hdr.hdr_version))
+ return error("packfile %s is version %"PRIu32" and not"
+ " supported (try upgrading GIT to a newer version)",
+ p->pack_name, ntohl(hdr.hdr_version));
+
+ /* Verify the pack matches its index. */
+ if (p->num_objects != ntohl(hdr.hdr_entries))
+ return error("packfile %s claims to have %"PRIu32" objects"
+ " while index indicates %"PRIu32" objects",
+ p->pack_name, ntohl(hdr.hdr_entries),
+ p->num_objects);
+ read_result = pread_in_full(p->pack_fd, hash, hashsz,
+ p->pack_size - hashsz);
+ if (read_result < 0)
+ return error_errno("error reading from %s", p->pack_name);
+ if (read_result != hashsz)
+ return error("packfile %s signature is unavailable", p->pack_name);
+ idx_hash = ((unsigned char *)p->index_data) + p->index_size - hashsz * 2;
+ if (!hasheq(hash, idx_hash))
+ return error("packfile %s does not match index", p->pack_name);
+ return 0;
+}
+
+static int open_packed_git(struct packed_git *p)
+{
+ if (!open_packed_git_1(p))
+ return 0;
+ close_pack_fd(p);
+ return -1;
+}
+
+static int in_window(struct pack_window *win, off_t offset)
+{
+ /* We must promise at least one full hash after the
+ * offset is available from this window, otherwise the offset
+ * is not actually in this window and a different window (which
+ * has that one hash excess) must be used. This is to support
+ * the object header and delta base parsing routines below.
+ */
+ off_t win_off = win->offset;
+ return win_off <= offset
+ && (offset + the_hash_algo->rawsz) <= (win_off + win->len);
+}
+
+unsigned char *use_pack(struct packed_git *p,
+ struct pack_window **w_cursor,
+ off_t offset,
+ unsigned long *left)
+{
+ struct pack_window *win = *w_cursor;
+
+ /* Since packfiles end in a hash of their content and it's
+ * pointless to ask for an offset into the middle of that
+ * hash, and the in_window function above wouldn't match
+ * don't allow an offset too close to the end of the file.
+ */
+ if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
+ die("packfile %s cannot be accessed", p->pack_name);
+ if (offset > (p->pack_size - the_hash_algo->rawsz))
+ die("offset beyond end of packfile (truncated pack?)");
+ if (offset < 0)
+ die(_("offset before end of packfile (broken .idx?)"));
+
+ if (!win || !in_window(win, offset)) {
+ if (win)
+ win->inuse_cnt--;
+ for (win = p->windows; win; win = win->next) {
+ if (in_window(win, offset))
+ break;
+ }
+ if (!win) {
+ size_t window_align = packed_git_window_size / 2;
+ off_t len;
+
+ if (p->pack_fd == -1 && open_packed_git(p))
+ die("packfile %s cannot be accessed", p->pack_name);
+
+ CALLOC_ARRAY(win, 1);
+ win->offset = (offset / window_align) * window_align;
+ len = p->pack_size - win->offset;
+ if (len > packed_git_window_size)
+ len = packed_git_window_size;
+ win->len = (size_t)len;
+ pack_mapped += win->len;
+ while (packed_git_limit < pack_mapped
+ && unuse_one_window(p))
+ ; /* nothing */
+ win->base = xmmap_gently(NULL, win->len,
+ PROT_READ, MAP_PRIVATE,
+ p->pack_fd, win->offset);
+ if (win->base == MAP_FAILED)
+ die_errno(_("packfile %s cannot be mapped%s"),
+ p->pack_name, mmap_os_err());
+ if (!win->offset && win->len == p->pack_size
+ && !p->do_not_close)
+ close_pack_fd(p);
+ pack_mmap_calls++;
+ pack_open_windows++;
+ if (pack_mapped > peak_pack_mapped)
+ peak_pack_mapped = pack_mapped;
+ if (pack_open_windows > peak_pack_open_windows)
+ peak_pack_open_windows = pack_open_windows;
+ win->next = p->windows;
+ p->windows = win;
+ }
+ }
+ if (win != *w_cursor) {
+ win->last_used = pack_used_ctr++;
+ win->inuse_cnt++;
+ *w_cursor = win;
+ }
+ offset -= win->offset;
+ if (left)
+ *left = win->len - xsize_t(offset);
+ return win->base + offset;
+}
+
+void unuse_pack(struct pack_window **w_cursor)
+{
+ struct pack_window *w = *w_cursor;
+ if (w) {
+ w->inuse_cnt--;
+ *w_cursor = NULL;
+ }
+}
+
+struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
+{
+ struct stat st;
+ size_t alloc;
+ struct packed_git *p;
+
+ /*
+ * Make sure a corresponding .pack file exists and that
+ * the index looks sane.
+ */
+ if (!strip_suffix_mem(path, &path_len, ".idx"))
+ return NULL;
+
+ /*
+ * ".promisor" is long enough to hold any suffix we're adding (and
+ * the use xsnprintf double-checks that)
+ */
+ alloc = st_add3(path_len, strlen(".promisor"), 1);
+ p = alloc_packed_git(alloc);
+ memcpy(p->pack_name, path, path_len);
+
+ xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
+ if (!access(p->pack_name, F_OK))
+ p->pack_keep = 1;
+
+ xsnprintf(p->pack_name + path_len, alloc - path_len, ".promisor");
+ if (!access(p->pack_name, F_OK))
+ p->pack_promisor = 1;
+
+ xsnprintf(p->pack_name + path_len, alloc - path_len, ".mtimes");
+ if (!access(p->pack_name, F_OK))
+ p->is_cruft = 1;
+
+ xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
+ if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
+ free(p);
+ return NULL;
+ }
+
+ /* ok, it looks sane as far as we can check without
+ * actually mapping the pack file.
+ */
+ p->pack_size = st.st_size;
+ p->pack_local = local;
+ p->mtime = st.st_mtime;
+ if (path_len < the_hash_algo->hexsz ||
+ get_hash_hex(path + path_len - the_hash_algo->hexsz, p->hash))
+ hashclr(p->hash);
+ return p;
+}
+
+void install_packed_git(struct repository *r, struct packed_git *pack)
+{
+ if (pack->pack_fd != -1)
+ pack_open_fds++;
+
+ pack->next = r->objects->packed_git;
+ r->objects->packed_git = pack;
+
+ hashmap_entry_init(&pack->packmap_ent, strhash(pack->pack_name));
+ hashmap_add(&r->objects->pack_map, &pack->packmap_ent);
+}
+
+void (*report_garbage)(unsigned seen_bits, const char *path);
+
+static void report_helper(const struct string_list *list,
+ int seen_bits, int first, int last)
+{
+ if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
+ return;
+
+ for (; first < last; first++)
+ report_garbage(seen_bits, list->items[first].string);
+}
+
+static void report_pack_garbage(struct string_list *list)
+{
+ int i, baselen = -1, first = 0, seen_bits = 0;
+
+ if (!report_garbage)
+ return;
+
+ string_list_sort(list);
+
+ for (i = 0; i < list->nr; i++) {
+ const char *path = list->items[i].string;
+ if (baselen != -1 &&
+ strncmp(path, list->items[first].string, baselen)) {
+ report_helper(list, seen_bits, first, i);
+ baselen = -1;
+ seen_bits = 0;
+ }
+ if (baselen == -1) {
+ const char *dot = strrchr(path, '.');
+ if (!dot) {
+ report_garbage(PACKDIR_FILE_GARBAGE, path);
+ continue;
+ }
+ baselen = dot - path + 1;
+ first = i;
+ }
+ if (!strcmp(path + baselen, "pack"))
+ seen_bits |= 1;
+ else if (!strcmp(path + baselen, "idx"))
+ seen_bits |= 2;
+ }
+ report_helper(list, seen_bits, first, list->nr);
+}
+
+void for_each_file_in_pack_dir(const char *objdir,
+ each_file_in_pack_dir_fn fn,
+ void *data)
+{
+ struct strbuf path = STRBUF_INIT;
+ size_t dirnamelen;
+ DIR *dir;
+ struct dirent *de;
+
+ strbuf_addstr(&path, objdir);
+ strbuf_addstr(&path, "/pack");
+ dir = opendir(path.buf);
+ if (!dir) {
+ if (errno != ENOENT)
+ error_errno("unable to open object pack directory: %s",
+ path.buf);
+ strbuf_release(&path);
+ return;
+ }
+ strbuf_addch(&path, '/');
+ dirnamelen = path.len;
+ while ((de = readdir_skip_dot_and_dotdot(dir)) != NULL) {
+ strbuf_setlen(&path, dirnamelen);
+ strbuf_addstr(&path, de->d_name);
+
+ fn(path.buf, path.len, de->d_name, data);
+ }
+
+ closedir(dir);
+ strbuf_release(&path);
+}
+
+struct prepare_pack_data {
+ struct repository *r;
+ struct string_list *garbage;
+ int local;
+ struct multi_pack_index *m;
+};
+
+static void prepare_pack(const char *full_name, size_t full_name_len,
+ const char *file_name, void *_data)
+{
+ struct prepare_pack_data *data = (struct prepare_pack_data *)_data;
+ struct packed_git *p;
+ size_t base_len = full_name_len;
+
+ if (strip_suffix_mem(full_name, &base_len, ".idx") &&
+ !(data->m && midx_contains_pack(data->m, file_name))) {
+ struct hashmap_entry hent;
+ char *pack_name = xstrfmt("%.*s.pack", (int)base_len, full_name);
+ unsigned int hash = strhash(pack_name);
+ hashmap_entry_init(&hent, hash);
+
+ /* Don't reopen a pack we already have. */
+ if (!hashmap_get(&data->r->objects->pack_map, &hent, pack_name)) {
+ p = add_packed_git(full_name, full_name_len, data->local);
+ if (p)
+ install_packed_git(data->r, p);
+ }
+ free(pack_name);
+ }
+
+ if (!report_garbage)
+ return;
+
+ if (!strcmp(file_name, "multi-pack-index"))
+ return;
+ if (starts_with(file_name, "multi-pack-index") &&
+ (ends_with(file_name, ".bitmap") || ends_with(file_name, ".rev")))
+ return;
+ if (ends_with(file_name, ".idx") ||
+ ends_with(file_name, ".rev") ||
+ ends_with(file_name, ".pack") ||
+ ends_with(file_name, ".bitmap") ||
+ ends_with(file_name, ".keep") ||
+ ends_with(file_name, ".promisor") ||
+ ends_with(file_name, ".mtimes"))
+ string_list_append(data->garbage, full_name);
+ else
+ report_garbage(PACKDIR_FILE_GARBAGE, full_name);
+}
+
+static void prepare_packed_git_one(struct repository *r, char *objdir, int local)
+{
+ struct prepare_pack_data data;
+ struct string_list garbage = STRING_LIST_INIT_DUP;
+
+ data.m = r->objects->multi_pack_index;
+
+ /* look for the multi-pack-index for this object directory */
+ while (data.m && strcmp(data.m->object_dir, objdir))
+ data.m = data.m->next;
+
+ data.r = r;
+ data.garbage = &garbage;
+ data.local = local;
+
+ for_each_file_in_pack_dir(objdir, prepare_pack, &data);
+
+ report_pack_garbage(data.garbage);
+ string_list_clear(data.garbage, 0);
+}
+
+static void prepare_packed_git(struct repository *r);
+/*
+ * Give a fast, rough count of the number of objects in the repository. This
+ * ignores loose objects completely. If you have a lot of them, then either
+ * you should repack because your performance will be awful, or they are
+ * all unreachable objects about to be pruned, in which case they're not really
+ * interesting as a measure of repo size in the first place.
+ */
+unsigned long repo_approximate_object_count(struct repository *r)
+{
+ if (!r->objects->approximate_object_count_valid) {
+ unsigned long count;
+ struct multi_pack_index *m;
+ struct packed_git *p;
+
+ prepare_packed_git(r);
+ count = 0;
+ for (m = get_multi_pack_index(r); m; m = m->next)
+ count += m->num_objects;
+ for (p = r->objects->packed_git; p; p = p->next) {
+ if (open_pack_index(p))
+ continue;
+ count += p->num_objects;
+ }
+ r->objects->approximate_object_count = count;
+ r->objects->approximate_object_count_valid = 1;
+ }
+ return r->objects->approximate_object_count;
+}
+
+DEFINE_LIST_SORT(static, sort_packs, struct packed_git, next);
+
+static int sort_pack(const struct packed_git *a, const struct packed_git *b)
+{
+ int st;
+
+ /*
+ * Local packs tend to contain objects specific to our
+ * variant of the project than remote ones. In addition,
+ * remote ones could be on a network mounted filesystem.
+ * Favor local ones for these reasons.
+ */
+ st = a->pack_local - b->pack_local;
+ if (st)
+ return -st;
+
+ /*
+ * Younger packs tend to contain more recent objects,
+ * and more recent objects tend to get accessed more
+ * often.
+ */
+ if (a->mtime < b->mtime)
+ return 1;
+ else if (a->mtime == b->mtime)
+ return 0;
+ return -1;
+}
+
+static void rearrange_packed_git(struct repository *r)
+{
+ sort_packs(&r->objects->packed_git, sort_pack);
+}
+
+static void prepare_packed_git_mru(struct repository *r)
+{
+ struct packed_git *p;
+
+ INIT_LIST_HEAD(&r->objects->packed_git_mru);
+
+ for (p = r->objects->packed_git; p; p = p->next)
+ list_add_tail(&p->mru, &r->objects->packed_git_mru);
+}
+
+static void prepare_packed_git(struct repository *r)
+{
+ struct object_directory *odb;
+
+ if (r->objects->packed_git_initialized)
+ return;
+
+ prepare_alt_odb(r);
+ for (odb = r->objects->odb; odb; odb = odb->next) {
+ int local = (odb == r->objects->odb);
+ prepare_multi_pack_index_one(r, odb->path, local);
+ prepare_packed_git_one(r, odb->path, local);
+ }
+ rearrange_packed_git(r);
+
+ prepare_packed_git_mru(r);
+ r->objects->packed_git_initialized = 1;
+}
+
+void reprepare_packed_git(struct repository *r)
+{
+ struct object_directory *odb;
+
+ obj_read_lock();
+
+ /*
+ * Reprepare alt odbs, in case the alternates file was modified
+ * during the course of this process. This only _adds_ odbs to
+ * the linked list, so existing odbs will continue to exist for
+ * the lifetime of the process.
+ */
+ r->objects->loaded_alternates = 0;
+ prepare_alt_odb(r);
+
+ for (odb = r->objects->odb; odb; odb = odb->next)
+ odb_clear_loose_cache(odb);
+
+ r->objects->approximate_object_count_valid = 0;
+ r->objects->packed_git_initialized = 0;
+ prepare_packed_git(r);
+ obj_read_unlock();
+}
+
+struct packed_git *get_packed_git(struct repository *r)
+{
+ prepare_packed_git(r);
+ return r->objects->packed_git;
+}
+
+struct multi_pack_index *get_multi_pack_index(struct repository *r)
+{
+ prepare_packed_git(r);
+ return r->objects->multi_pack_index;
+}
+
+struct multi_pack_index *get_local_multi_pack_index(struct repository *r)
+{
+ struct multi_pack_index *m = get_multi_pack_index(r);
+
+ /* no need to iterate; we always put the local one first (if any) */
+ if (m && m->local)
+ return m;
+
+ return NULL;
+}
+
+struct packed_git *get_all_packs(struct repository *r)
+{
+ struct multi_pack_index *m;
+
+ prepare_packed_git(r);
+ for (m = r->objects->multi_pack_index; m; m = m->next) {
+ uint32_t i;
+ for (i = 0; i < m->num_packs; i++)
+ prepare_midx_pack(r, m, i);
+ }
+
+ return r->objects->packed_git;
+}
+
+struct list_head *get_packed_git_mru(struct repository *r)
+{
+ prepare_packed_git(r);
+ return &r->objects->packed_git_mru;
+}
+
+unsigned long unpack_object_header_buffer(const unsigned char *buf,
+ unsigned long len, enum object_type *type, unsigned long *sizep)
+{
+ unsigned shift;
+ size_t size, c;
+ unsigned long used = 0;
+
+ c = buf[used++];
+ *type = (c >> 4) & 7;
+ size = c & 15;
+ shift = 4;
+ while (c & 0x80) {
+ if (len <= used || (bitsizeof(long) - 7) < shift) {
+ error("bad object header");
+ size = used = 0;
+ break;
+ }
+ c = buf[used++];
+ size = st_add(size, st_left_shift(c & 0x7f, shift));
+ shift += 7;
+ }
+ *sizep = cast_size_t_to_ulong(size);
+ return used;
+}
+
+unsigned long get_size_from_delta(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos)
+{
+ const unsigned char *data;
+ unsigned char delta_head[20], *in;
+ git_zstream stream;
+ int st;
+
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = delta_head;
+ stream.avail_out = sizeof(delta_head);
+
+ git_inflate_init(&stream);
+ do {
+ in = use_pack(p, w_curs, curpos, &stream.avail_in);
+ stream.next_in = in;
+ /*
+ * Note: the window section returned by use_pack() must be
+ * available throughout git_inflate()'s unlocked execution. To
+ * ensure no other thread will modify the window in the
+ * meantime, we rely on the packed_window.inuse_cnt. This
+ * counter is incremented before window reading and checked
+ * before window disposal.
+ *
+ * Other worrying sections could be the call to close_pack_fd(),
+ * which can close packs even with in-use windows, and to
+ * reprepare_packed_git(). Regarding the former, mmap doc says:
+ * "closing the file descriptor does not unmap the region". And
+ * for the latter, it won't re-open already available packs.
+ */
+ obj_read_unlock();
+ st = git_inflate(&stream, Z_FINISH);
+ obj_read_lock();
+ curpos += stream.next_in - in;
+ } while ((st == Z_OK || st == Z_BUF_ERROR) &&
+ stream.total_out < sizeof(delta_head));
+ git_inflate_end(&stream);
+ if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
+ error("delta data unpack-initial failed");
+ return 0;
+ }
+
+ /* Examine the initial part of the delta to figure out
+ * the result size.
+ */
+ data = delta_head;
+
+ /* ignore base size */
+ get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
+
+ /* Read the result size */
+ return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
+}
+
+int unpack_object_header(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t *curpos,
+ unsigned long *sizep)
+{
+ unsigned char *base;
+ unsigned long left;
+ unsigned long used;
+ enum object_type type;
+
+ /* use_pack() assures us we have [base, base + 20) available
+ * as a range that we can look at. (Its actually the hash
+ * size that is assured.) With our object header encoding
+ * the maximum deflated object size is 2^137, which is just
+ * insane, so we know won't exceed what we have been given.
+ */
+ base = use_pack(p, w_curs, *curpos, &left);
+ used = unpack_object_header_buffer(base, left, &type, sizep);
+ if (!used) {
+ type = OBJ_BAD;
+ } else
+ *curpos += used;
+
+ return type;
+}
+
+void mark_bad_packed_object(struct packed_git *p, const struct object_id *oid)
+{
+ oidset_insert(&p->bad_objects, oid);
+}
+
+const struct packed_git *has_packed_and_bad(struct repository *r,
+ const struct object_id *oid)
+{
+ struct packed_git *p;
+
+ for (p = r->objects->packed_git; p; p = p->next)
+ if (oidset_contains(&p->bad_objects, oid))
+ return p;
+ return NULL;
+}
+
+off_t get_delta_base(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t *curpos,
+ enum object_type type,
+ off_t delta_obj_offset)
+{
+ unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
+ off_t base_offset;
+
+ /* use_pack() assured us we have [base_info, base_info + 20)
+ * as a range that we can look at without walking off the
+ * end of the mapped window. Its actually the hash size
+ * that is assured. An OFS_DELTA longer than the hash size
+ * is stupid, as then a REF_DELTA would be smaller to store.
+ */
+ if (type == OBJ_OFS_DELTA) {
+ unsigned used = 0;
+ unsigned char c = base_info[used++];
+ base_offset = c & 127;
+ while (c & 128) {
+ base_offset += 1;
+ if (!base_offset || MSB(base_offset, 7))
+ return 0; /* overflow */
+ c = base_info[used++];
+ base_offset = (base_offset << 7) + (c & 127);
+ }
+ base_offset = delta_obj_offset - base_offset;
+ if (base_offset <= 0 || base_offset >= delta_obj_offset)
+ return 0; /* out of bound */
+ *curpos += used;
+ } else if (type == OBJ_REF_DELTA) {
+ /* The base entry _must_ be in the same pack */
+ base_offset = find_pack_entry_one(base_info, p);
+ *curpos += the_hash_algo->rawsz;
+ } else
+ die("I am totally screwed");
+ return base_offset;
+}
+
+/*
+ * Like get_delta_base above, but we return the sha1 instead of the pack
+ * offset. This means it is cheaper for REF deltas (we do not have to do
+ * the final object lookup), but more expensive for OFS deltas (we
+ * have to load the revidx to convert the offset back into a sha1).
+ */
+static int get_delta_base_oid(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos,
+ struct object_id *oid,
+ enum object_type type,
+ off_t delta_obj_offset)
+{
+ if (type == OBJ_REF_DELTA) {
+ unsigned char *base = use_pack(p, w_curs, curpos, NULL);
+ oidread(oid, base);
+ return 0;
+ } else if (type == OBJ_OFS_DELTA) {
+ uint32_t base_pos;
+ off_t base_offset = get_delta_base(p, w_curs, &curpos,
+ type, delta_obj_offset);
+
+ if (!base_offset)
+ return -1;
+
+ if (offset_to_pack_pos(p, base_offset, &base_pos) < 0)
+ return -1;
+
+ return nth_packed_object_id(oid, p,
+ pack_pos_to_index(p, base_pos));
+ } else
+ return -1;
+}
+
+static int retry_bad_packed_offset(struct repository *r,
+ struct packed_git *p,
+ off_t obj_offset)
+{
+ int type;
+ uint32_t pos;
+ struct object_id oid;
+ if (offset_to_pack_pos(p, obj_offset, &pos) < 0)
+ return OBJ_BAD;
+ nth_packed_object_id(&oid, p, pack_pos_to_index(p, pos));
+ mark_bad_packed_object(p, &oid);
+ type = oid_object_info(r, &oid, NULL);
+ if (type <= OBJ_NONE)
+ return OBJ_BAD;
+ return type;
+}
+
+#define POI_STACK_PREALLOC 64
+
+static enum object_type packed_to_object_type(struct repository *r,
+ struct packed_git *p,
+ off_t obj_offset,
+ enum object_type type,
+ struct pack_window **w_curs,
+ off_t curpos)
+{
+ off_t small_poi_stack[POI_STACK_PREALLOC];
+ off_t *poi_stack = small_poi_stack;
+ int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
+
+ while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+ off_t base_offset;
+ unsigned long size;
+ /* Push the object we're going to leave behind */
+ if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
+ poi_stack_alloc = alloc_nr(poi_stack_nr);
+ ALLOC_ARRAY(poi_stack, poi_stack_alloc);
+ COPY_ARRAY(poi_stack, small_poi_stack, poi_stack_nr);
+ } else {
+ ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
+ }
+ poi_stack[poi_stack_nr++] = obj_offset;
+ /* If parsing the base offset fails, just unwind */
+ base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
+ if (!base_offset)
+ goto unwind;
+ curpos = obj_offset = base_offset;
+ type = unpack_object_header(p, w_curs, &curpos, &size);
+ if (type <= OBJ_NONE) {
+ /* If getting the base itself fails, we first
+ * retry the base, otherwise unwind */
+ type = retry_bad_packed_offset(r, p, base_offset);
+ if (type > OBJ_NONE)
+ goto out;
+ goto unwind;
+ }
+ }
+
+ switch (type) {
+ case OBJ_BAD:
+ case OBJ_COMMIT:
+ case OBJ_TREE:
+ case OBJ_BLOB:
+ case OBJ_TAG:
+ break;
+ default:
+ error("unknown object type %i at offset %"PRIuMAX" in %s",
+ type, (uintmax_t)obj_offset, p->pack_name);
+ type = OBJ_BAD;
+ }
+
+out:
+ if (poi_stack != small_poi_stack)
+ free(poi_stack);
+ return type;
+
+unwind:
+ while (poi_stack_nr) {
+ obj_offset = poi_stack[--poi_stack_nr];
+ type = retry_bad_packed_offset(r, p, obj_offset);
+ if (type > OBJ_NONE)
+ goto out;
+ }
+ type = OBJ_BAD;
+ goto out;
+}
+
+static struct hashmap delta_base_cache;
+static size_t delta_base_cached;
+
+static LIST_HEAD(delta_base_cache_lru);
+
+struct delta_base_cache_key {
+ struct packed_git *p;
+ off_t base_offset;
+};
+
+struct delta_base_cache_entry {
+ struct hashmap_entry ent;
+ struct delta_base_cache_key key;
+ struct list_head lru;
+ void *data;
+ unsigned long size;
+ enum object_type type;
+};
+
+static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
+{
+ unsigned int hash;
+
+ hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
+ hash += (hash >> 8) + (hash >> 16);
+ return hash;
+}
+
+static struct delta_base_cache_entry *
+get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
+{
+ struct hashmap_entry entry, *e;
+ struct delta_base_cache_key key;
+
+ if (!delta_base_cache.cmpfn)
+ return NULL;
+
+ hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
+ key.p = p;
+ key.base_offset = base_offset;
+ e = hashmap_get(&delta_base_cache, &entry, &key);
+ return e ? container_of(e, struct delta_base_cache_entry, ent) : NULL;
+}
+
+static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
+ const struct delta_base_cache_key *b)
+{
+ return a->p == b->p && a->base_offset == b->base_offset;
+}
+
+static int delta_base_cache_hash_cmp(const void *cmp_data UNUSED,
+ const struct hashmap_entry *va,
+ const struct hashmap_entry *vb,
+ const void *vkey)
+{
+ const struct delta_base_cache_entry *a, *b;
+ const struct delta_base_cache_key *key = vkey;
+
+ a = container_of(va, const struct delta_base_cache_entry, ent);
+ b = container_of(vb, const struct delta_base_cache_entry, ent);
+
+ if (key)
+ return !delta_base_cache_key_eq(&a->key, key);
+ else
+ return !delta_base_cache_key_eq(&a->key, &b->key);
+}
+
+static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
+{
+ return !!get_delta_base_cache_entry(p, base_offset);
+}
+
+/*
+ * Remove the entry from the cache, but do _not_ free the associated
+ * entry data. The caller takes ownership of the "data" buffer, and
+ * should copy out any fields it wants before detaching.
+ */
+static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
+{
+ hashmap_remove(&delta_base_cache, &ent->ent, &ent->key);
+ list_del(&ent->lru);
+ delta_base_cached -= ent->size;
+ free(ent);
+}
+
+static void *cache_or_unpack_entry(struct repository *r, struct packed_git *p,
+ off_t base_offset, unsigned long *base_size,
+ enum object_type *type)
+{
+ struct delta_base_cache_entry *ent;
+
+ ent = get_delta_base_cache_entry(p, base_offset);
+ if (!ent)
+ return unpack_entry(r, p, base_offset, type, base_size);
+
+ if (type)
+ *type = ent->type;
+ if (base_size)
+ *base_size = ent->size;
+ return xmemdupz(ent->data, ent->size);
+}
+
+static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
+{
+ free(ent->data);
+ detach_delta_base_cache_entry(ent);
+}
+
+void clear_delta_base_cache(void)
+{
+ struct list_head *lru, *tmp;
+ list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
+ struct delta_base_cache_entry *entry =
+ list_entry(lru, struct delta_base_cache_entry, lru);
+ release_delta_base_cache(entry);
+ }
+}
+
+static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
+ void *base, unsigned long base_size, enum object_type type)
+{
+ struct delta_base_cache_entry *ent;
+ struct list_head *lru, *tmp;
+
+ /*
+ * Check required to avoid redundant entries when more than one thread
+ * is unpacking the same object, in unpack_entry() (since its phases I
+ * and III might run concurrently across multiple threads).
+ */
+ if (in_delta_base_cache(p, base_offset)) {
+ free(base);
+ return;
+ }
+
+ delta_base_cached += base_size;
+
+ list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
+ struct delta_base_cache_entry *f =
+ list_entry(lru, struct delta_base_cache_entry, lru);
+ if (delta_base_cached <= delta_base_cache_limit)
+ break;
+ release_delta_base_cache(f);
+ }
+
+ ent = xmalloc(sizeof(*ent));
+ ent->key.p = p;
+ ent->key.base_offset = base_offset;
+ ent->type = type;
+ ent->data = base;
+ ent->size = base_size;
+ list_add_tail(&ent->lru, &delta_base_cache_lru);
+
+ if (!delta_base_cache.cmpfn)
+ hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, NULL, 0);
+ hashmap_entry_init(&ent->ent, pack_entry_hash(p, base_offset));
+ hashmap_add(&delta_base_cache, &ent->ent);
+}
+
+int packed_object_info(struct repository *r, struct packed_git *p,
+ off_t obj_offset, struct object_info *oi)
+{
+ struct pack_window *w_curs = NULL;
+ unsigned long size;
+ off_t curpos = obj_offset;
+ enum object_type type;
+
+ /*
+ * We always get the representation type, but only convert it to
+ * a "real" type later if the caller is interested.
+ */
+ if (oi->contentp) {
+ *oi->contentp = cache_or_unpack_entry(r, p, obj_offset, oi->sizep,
+ &type);
+ if (!*oi->contentp)
+ type = OBJ_BAD;
+ } else {
+ type = unpack_object_header(p, &w_curs, &curpos, &size);
+ }
+
+ if (!oi->contentp && oi->sizep) {
+ if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+ off_t tmp_pos = curpos;
+ off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
+ type, obj_offset);
+ if (!base_offset) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ *oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
+ if (*oi->sizep == 0) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ } else {
+ *oi->sizep = size;
+ }
+ }
+
+ if (oi->disk_sizep) {
+ uint32_t pos;
+ if (offset_to_pack_pos(p, obj_offset, &pos) < 0) {
+ error("could not find object at offset %"PRIuMAX" "
+ "in pack %s", (uintmax_t)obj_offset, p->pack_name);
+ type = OBJ_BAD;
+ goto out;
+ }
+
+ *oi->disk_sizep = pack_pos_to_offset(p, pos + 1) - obj_offset;
+ }
+
+ if (oi->typep || oi->type_name) {
+ enum object_type ptot;
+ ptot = packed_to_object_type(r, p, obj_offset,
+ type, &w_curs, curpos);
+ if (oi->typep)
+ *oi->typep = ptot;
+ if (oi->type_name) {
+ const char *tn = type_name(ptot);
+ if (tn)
+ strbuf_addstr(oi->type_name, tn);
+ }
+ if (ptot < 0) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ }
+
+ if (oi->delta_base_oid) {
+ if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
+ if (get_delta_base_oid(p, &w_curs, curpos,
+ oi->delta_base_oid,
+ type, obj_offset) < 0) {
+ type = OBJ_BAD;
+ goto out;
+ }
+ } else
+ oidclr(oi->delta_base_oid);
+ }
+
+ oi->whence = in_delta_base_cache(p, obj_offset) ? OI_DBCACHED :
+ OI_PACKED;
+
+out:
+ unuse_pack(&w_curs);
+ return type;
+}
+
+static void *unpack_compressed_entry(struct packed_git *p,
+ struct pack_window **w_curs,
+ off_t curpos,
+ unsigned long size)
+{
+ int st;
+ git_zstream stream;
+ unsigned char *buffer, *in;
+
+ buffer = xmallocz_gently(size);
+ if (!buffer)
+ return NULL;
+ memset(&stream, 0, sizeof(stream));
+ stream.next_out = buffer;
+ stream.avail_out = size + 1;
+
+ git_inflate_init(&stream);
+ do {
+ in = use_pack(p, w_curs, curpos, &stream.avail_in);
+ stream.next_in = in;
+ /*
+ * Note: we must ensure the window section returned by
+ * use_pack() will be available throughout git_inflate()'s
+ * unlocked execution. Please refer to the comment at
+ * get_size_from_delta() to see how this is done.
+ */
+ obj_read_unlock();
+ st = git_inflate(&stream, Z_FINISH);
+ obj_read_lock();
+ if (!stream.avail_out)
+ break; /* the payload is larger than it should be */
+ curpos += stream.next_in - in;
+ } while (st == Z_OK || st == Z_BUF_ERROR);
+ git_inflate_end(&stream);
+ if ((st != Z_STREAM_END) || stream.total_out != size) {
+ free(buffer);
+ return NULL;
+ }
+
+ /* versions of zlib can clobber unconsumed portion of outbuf */
+ buffer[size] = '\0';
+
+ return buffer;
+}
+
+static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
+{
+ static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
+ trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
+ p->pack_name, (uintmax_t)obj_offset);
+}
+
+int do_check_packed_object_crc;
+
+#define UNPACK_ENTRY_STACK_PREALLOC 64
+struct unpack_entry_stack_ent {
+ off_t obj_offset;
+ off_t curpos;
+ unsigned long size;
+};
+
+void *unpack_entry(struct repository *r, struct packed_git *p, off_t obj_offset,
+ enum object_type *final_type, unsigned long *final_size)
+{
+ struct pack_window *w_curs = NULL;
+ off_t curpos = obj_offset;
+ void *data = NULL;
+ unsigned long size;
+ enum object_type type;
+ struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
+ struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
+ int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
+ int base_from_cache = 0;
+
+ write_pack_access_log(p, obj_offset);
+
+ /* PHASE 1: drill down to the innermost base object */
+ for (;;) {
+ off_t base_offset;
+ int i;
+ struct delta_base_cache_entry *ent;
+
+ ent = get_delta_base_cache_entry(p, curpos);
+ if (ent) {
+ type = ent->type;
+ data = ent->data;
+ size = ent->size;
+ detach_delta_base_cache_entry(ent);
+ base_from_cache = 1;
+ break;
+ }
+
+ if (do_check_packed_object_crc && p->index_version > 1) {
+ uint32_t pack_pos, index_pos;
+ off_t len;
+
+ if (offset_to_pack_pos(p, obj_offset, &pack_pos) < 0) {
+ error("could not find object at offset %"PRIuMAX" in pack %s",
+ (uintmax_t)obj_offset, p->pack_name);
+ data = NULL;
+ goto out;
+ }
+
+ len = pack_pos_to_offset(p, pack_pos + 1) - obj_offset;
+ index_pos = pack_pos_to_index(p, pack_pos);
+ if (check_pack_crc(p, &w_curs, obj_offset, len, index_pos)) {
+ struct object_id oid;
+ nth_packed_object_id(&oid, p, index_pos);
+ error("bad packed object CRC for %s",
+ oid_to_hex(&oid));
+ mark_bad_packed_object(p, &oid);
+ data = NULL;
+ goto out;
+ }
+ }
+
+ type = unpack_object_header(p, &w_curs, &curpos, &size);
+ if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
+ break;
+
+ base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
+ if (!base_offset) {
+ error("failed to validate delta base reference "
+ "at offset %"PRIuMAX" from %s",
+ (uintmax_t)curpos, p->pack_name);
+ /* bail to phase 2, in hopes of recovery */
+ data = NULL;
+ break;
+ }
+
+ /* push object, proceed to base */
+ if (delta_stack_nr >= delta_stack_alloc
+ && delta_stack == small_delta_stack) {
+ delta_stack_alloc = alloc_nr(delta_stack_nr);
+ ALLOC_ARRAY(delta_stack, delta_stack_alloc);
+ COPY_ARRAY(delta_stack, small_delta_stack,
+ delta_stack_nr);
+ } else {
+ ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
+ }
+ i = delta_stack_nr++;
+ delta_stack[i].obj_offset = obj_offset;
+ delta_stack[i].curpos = curpos;
+ delta_stack[i].size = size;
+
+ curpos = obj_offset = base_offset;
+ }
+
+ /* PHASE 2: handle the base */
+ switch (type) {
+ case OBJ_OFS_DELTA:
+ case OBJ_REF_DELTA:
+ if (data)
+ BUG("unpack_entry: left loop at a valid delta");
+ break;
+ case OBJ_COMMIT:
+ case OBJ_TREE:
+ case OBJ_BLOB:
+ case OBJ_TAG:
+ if (!base_from_cache)
+ data = unpack_compressed_entry(p, &w_curs, curpos, size);
+ break;
+ default:
+ data = NULL;
+ error("unknown object type %i at offset %"PRIuMAX" in %s",
+ type, (uintmax_t)obj_offset, p->pack_name);
+ }
+
+ /* PHASE 3: apply deltas in order */
+
+ /* invariants:
+ * 'data' holds the base data, or NULL if there was corruption
+ */
+ while (delta_stack_nr) {
+ void *delta_data;
+ void *base = data;
+ void *external_base = NULL;
+ unsigned long delta_size, base_size = size;
+ int i;
+ off_t base_obj_offset = obj_offset;
+
+ data = NULL;
+
+ if (!base) {
+ /*
+ * We're probably in deep shit, but let's try to fetch
+ * the required base anyway from another pack or loose.
+ * This is costly but should happen only in the presence
+ * of a corrupted pack, and is better than failing outright.
+ */
+ uint32_t pos;
+ struct object_id base_oid;
+ if (!(offset_to_pack_pos(p, obj_offset, &pos))) {
+ struct object_info oi = OBJECT_INFO_INIT;
+
+ nth_packed_object_id(&base_oid, p,
+ pack_pos_to_index(p, pos));
+ error("failed to read delta base object %s"
+ " at offset %"PRIuMAX" from %s",
+ oid_to_hex(&base_oid), (uintmax_t)obj_offset,
+ p->pack_name);
+ mark_bad_packed_object(p, &base_oid);
+
+ oi.typep = &type;
+ oi.sizep = &base_size;
+ oi.contentp = &base;
+ if (oid_object_info_extended(r, &base_oid, &oi, 0) < 0)
+ base = NULL;
+
+ external_base = base;
+ }
+ }
+
+ i = --delta_stack_nr;
+ obj_offset = delta_stack[i].obj_offset;
+ curpos = delta_stack[i].curpos;
+ delta_size = delta_stack[i].size;
+
+ if (!base)
+ continue;
+
+ delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
+
+ if (!delta_data) {
+ error("failed to unpack compressed delta "
+ "at offset %"PRIuMAX" from %s",
+ (uintmax_t)curpos, p->pack_name);
+ data = NULL;
+ } else {
+ data = patch_delta(base, base_size, delta_data,
+ delta_size, &size);
+
+ /*
+ * We could not apply the delta; warn the user, but
+ * keep going. Our failure will be noticed either in
+ * the next iteration of the loop, or if this is the
+ * final delta, in the caller when we return NULL.
+ * Those code paths will take care of making a more
+ * explicit warning and retrying with another copy of
+ * the object.
+ */
+ if (!data)
+ error("failed to apply delta");
+ }
+
+ /*
+ * We delay adding `base` to the cache until the end of the loop
+ * because unpack_compressed_entry() momentarily releases the
+ * obj_read_mutex, giving another thread the chance to access
+ * the cache. Therefore, if `base` was already there, this other
+ * thread could free() it (e.g. to make space for another entry)
+ * before we are done using it.
+ */
+ if (!external_base)
+ add_delta_base_cache(p, base_obj_offset, base, base_size, type);
+
+ free(delta_data);
+ free(external_base);
+ }
+
+ if (final_type)
+ *final_type = type;
+ if (final_size)
+ *final_size = size;
+
+out:
+ unuse_pack(&w_curs);
+
+ if (delta_stack != small_delta_stack)
+ free(delta_stack);
+
+ return data;
+}
+
+int bsearch_pack(const struct object_id *oid, const struct packed_git *p, uint32_t *result)
+{
+ const unsigned char *index_fanout = p->index_data;
+ const unsigned char *index_lookup;
+ const unsigned int hashsz = the_hash_algo->rawsz;
+ int index_lookup_width;
+
+ if (!index_fanout)
+ BUG("bsearch_pack called without a valid pack-index");
+
+ index_lookup = index_fanout + 4 * 256;
+ if (p->index_version == 1) {
+ index_lookup_width = hashsz + 4;
+ index_lookup += 4;
+ } else {
+ index_lookup_width = hashsz;
+ index_fanout += 8;
+ index_lookup += 8;
+ }
+
+ return bsearch_hash(oid->hash, (const uint32_t*)index_fanout,
+ index_lookup, index_lookup_width, result);
+}
+
+int nth_packed_object_id(struct object_id *oid,
+ struct packed_git *p,
+ uint32_t n)
+{
+ const unsigned char *index = p->index_data;
+ const unsigned int hashsz = the_hash_algo->rawsz;
+ if (!index) {
+ if (open_pack_index(p))
+ return -1;
+ index = p->index_data;
+ }
+ if (n >= p->num_objects)
+ return -1;
+ index += 4 * 256;
+ if (p->index_version == 1) {
+ oidread(oid, index + st_add(st_mult(hashsz + 4, n), 4));
+ } else {
+ index += 8;
+ oidread(oid, index + st_mult(hashsz, n));
+ }
+ return 0;
+}
+
+void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
+{
+ const unsigned char *ptr = vptr;
+ const unsigned char *start = p->index_data;
+ const unsigned char *end = start + p->index_size;
+ if (ptr < start)
+ die(_("offset before start of pack index for %s (corrupt index?)"),
+ p->pack_name);
+ /* No need to check for underflow; .idx files must be at least 8 bytes */
+ if (ptr >= end - 8)
+ die(_("offset beyond end of pack index for %s (truncated index?)"),
+ p->pack_name);
+}
+
+off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
+{
+ const unsigned char *index = p->index_data;
+ const unsigned int hashsz = the_hash_algo->rawsz;
+ index += 4 * 256;
+ if (p->index_version == 1) {
+ return ntohl(*((uint32_t *)(index + st_mult(hashsz + 4, n))));
+ } else {
+ uint32_t off;
+ index += st_add(8, st_mult(p->num_objects, hashsz + 4));
+ off = ntohl(*((uint32_t *)(index + st_mult(4, n))));
+ if (!(off & 0x80000000))
+ return off;
+ index += st_add(st_mult(p->num_objects, 4),
+ st_mult(off & 0x7fffffff, 8));
+ check_pack_index_ptr(p, index);
+ return get_be64(index);
+ }
+}
+
+off_t find_pack_entry_one(const unsigned char *sha1,
+ struct packed_git *p)
+{
+ const unsigned char *index = p->index_data;
+ struct object_id oid;
+ uint32_t result;
+
+ if (!index) {
+ if (open_pack_index(p))
+ return 0;
+ }
+
+ hashcpy(oid.hash, sha1);
+ if (bsearch_pack(&oid, p, &result))
+ return nth_packed_object_offset(p, result);
+ return 0;
+}
+
+int is_pack_valid(struct packed_git *p)
+{
+ /* An already open pack is known to be valid. */
+ if (p->pack_fd != -1)
+ return 1;
+
+ /* If the pack has one window completely covering the
+ * file size, the pack is known to be valid even if
+ * the descriptor is not currently open.
+ */
+ if (p->windows) {
+ struct pack_window *w = p->windows;
+
+ if (!w->offset && w->len == p->pack_size)
+ return 1;
+ }
+
+ /* Force the pack to open to prove its valid. */
+ return !open_packed_git(p);
+}
+
+struct packed_git *find_sha1_pack(const unsigned char *sha1,
+ struct packed_git *packs)
+{
+ struct packed_git *p;
+
+ for (p = packs; p; p = p->next) {
+ if (find_pack_entry_one(sha1, p))
+ return p;
+ }
+ return NULL;
+
+}
+
+static int fill_pack_entry(const struct object_id *oid,
+ struct pack_entry *e,
+ struct packed_git *p)
+{
+ off_t offset;
+
+ if (oidset_size(&p->bad_objects) &&
+ oidset_contains(&p->bad_objects, oid))
+ return 0;
+
+ offset = find_pack_entry_one(oid->hash, p);
+ if (!offset)
+ return 0;
+
+ /*
+ * We are about to tell the caller where they can locate the
+ * requested object. We better make sure the packfile is
+ * still here and can be accessed before supplying that
+ * answer, as it may have been deleted since the index was
+ * loaded!
+ */
+ if (!is_pack_valid(p))
+ return 0;
+ e->offset = offset;
+ e->p = p;
+ return 1;
+}
+
+int find_pack_entry(struct repository *r, const struct object_id *oid, struct pack_entry *e)
+{
+ struct list_head *pos;
+ struct multi_pack_index *m;
+
+ prepare_packed_git(r);
+ if (!r->objects->packed_git && !r->objects->multi_pack_index)
+ return 0;
+
+ for (m = r->objects->multi_pack_index; m; m = m->next) {
+ if (fill_midx_entry(r, oid, e, m))
+ return 1;
+ }
+
+ list_for_each(pos, &r->objects->packed_git_mru) {
+ struct packed_git *p = list_entry(pos, struct packed_git, mru);
+ if (!p->multi_pack_index && fill_pack_entry(oid, e, p)) {
+ list_move(&p->mru, &r->objects->packed_git_mru);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void maybe_invalidate_kept_pack_cache(struct repository *r,
+ unsigned flags)
+{
+ if (!r->objects->kept_pack_cache.packs)
+ return;
+ if (r->objects->kept_pack_cache.flags == flags)
+ return;
+ FREE_AND_NULL(r->objects->kept_pack_cache.packs);
+ r->objects->kept_pack_cache.flags = 0;
+}
+
+static struct packed_git **kept_pack_cache(struct repository *r, unsigned flags)
+{
+ maybe_invalidate_kept_pack_cache(r, flags);
+
+ if (!r->objects->kept_pack_cache.packs) {
+ struct packed_git **packs = NULL;
+ size_t nr = 0, alloc = 0;
+ struct packed_git *p;
+
+ /*
+ * We want "all" packs here, because we need to cover ones that
+ * are used by a midx, as well. We need to look in every one of
+ * them (instead of the midx itself) to cover duplicates. It's
+ * possible that an object is found in two packs that the midx
+ * covers, one kept and one not kept, but the midx returns only
+ * the non-kept version.
+ */
+ for (p = get_all_packs(r); p; p = p->next) {
+ if ((p->pack_keep && (flags & ON_DISK_KEEP_PACKS)) ||
+ (p->pack_keep_in_core && (flags & IN_CORE_KEEP_PACKS))) {
+ ALLOC_GROW(packs, nr + 1, alloc);
+ packs[nr++] = p;
+ }
+ }
+ ALLOC_GROW(packs, nr + 1, alloc);
+ packs[nr] = NULL;
+
+ r->objects->kept_pack_cache.packs = packs;
+ r->objects->kept_pack_cache.flags = flags;
+ }
+
+ return r->objects->kept_pack_cache.packs;
+}
+
+int find_kept_pack_entry(struct repository *r,
+ const struct object_id *oid,
+ unsigned flags,
+ struct pack_entry *e)
+{
+ struct packed_git **cache;
+
+ for (cache = kept_pack_cache(r, flags); *cache; cache++) {
+ struct packed_git *p = *cache;
+ if (fill_pack_entry(oid, e, p))
+ return 1;
+ }
+
+ return 0;
+}
+
+int has_object_pack(const struct object_id *oid)
+{
+ struct pack_entry e;
+ return find_pack_entry(the_repository, oid, &e);
+}
+
+int has_object_kept_pack(const struct object_id *oid, unsigned flags)
+{
+ struct pack_entry e;
+ return find_kept_pack_entry(the_repository, oid, flags, &e);
+}
+
+int has_pack_index(const unsigned char *sha1)
+{
+ struct stat st;
+ if (stat(sha1_pack_index_name(sha1), &st))
+ return 0;
+ return 1;
+}
+
+int for_each_object_in_pack(struct packed_git *p,
+ each_packed_object_fn cb, void *data,
+ enum for_each_object_flags flags)
+{
+ uint32_t i;
+ int r = 0;
+
+ if (flags & FOR_EACH_OBJECT_PACK_ORDER) {
+ if (load_pack_revindex(the_repository, p))
+ return -1;
+ }
+
+ for (i = 0; i < p->num_objects; i++) {
+ uint32_t index_pos;
+ struct object_id oid;
+
+ /*
+ * We are iterating "i" from 0 up to num_objects, but its
+ * meaning may be different, depending on the requested output
+ * order:
+ *
+ * - in object-name order, it is the same as the index order
+ * used by nth_packed_object_id(), so we can pass it
+ * directly
+ *
+ * - in pack-order, it is pack position, which we must
+ * convert to an index position in order to get the oid.
+ */
+ if (flags & FOR_EACH_OBJECT_PACK_ORDER)
+ index_pos = pack_pos_to_index(p, i);
+ else
+ index_pos = i;
+
+ if (nth_packed_object_id(&oid, p, index_pos) < 0)
+ return error("unable to get sha1 of object %u in %s",
+ index_pos, p->pack_name);
+
+ r = cb(&oid, p, index_pos, data);
+ if (r)
+ break;
+ }
+ return r;
+}
+
+int for_each_packed_object(each_packed_object_fn cb, void *data,
+ enum for_each_object_flags flags)
+{
+ struct packed_git *p;
+ int r = 0;
+ int pack_errors = 0;
+
+ prepare_packed_git(the_repository);
+ for (p = get_all_packs(the_repository); p; p = p->next) {
+ if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
+ continue;
+ if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) &&
+ !p->pack_promisor)
+ continue;
+ if ((flags & FOR_EACH_OBJECT_SKIP_IN_CORE_KEPT_PACKS) &&
+ p->pack_keep_in_core)
+ continue;
+ if ((flags & FOR_EACH_OBJECT_SKIP_ON_DISK_KEPT_PACKS) &&
+ p->pack_keep)
+ continue;
+ if (open_pack_index(p)) {
+ pack_errors = 1;
+ continue;
+ }
+ r = for_each_object_in_pack(p, cb, data, flags);
+ if (r)
+ break;
+ }
+ return r ? r : pack_errors;
+}
+
+static int add_promisor_object(const struct object_id *oid,
+ struct packed_git *pack UNUSED,
+ uint32_t pos UNUSED,
+ void *set_)
+{
+ struct oidset *set = set_;
+ struct object *obj;
+ int we_parsed_object;
+
+ obj = lookup_object(the_repository, oid);
+ if (obj && obj->parsed) {
+ we_parsed_object = 0;
+ } else {
+ we_parsed_object = 1;
+ obj = parse_object(the_repository, oid);
+ }
+
+ if (!obj)
+ return 1;
+
+ oidset_insert(set, oid);
+
+ /*
+ * If this is a tree, commit, or tag, the objects it refers
+ * to are also promisor objects. (Blobs refer to no objects->)
+ */
+ if (obj->type == OBJ_TREE) {
+ struct tree *tree = (struct tree *)obj;
+ struct tree_desc desc;
+ struct name_entry entry;
+ if (init_tree_desc_gently(&desc, tree->buffer, tree->size, 0))
+ /*
+ * Error messages are given when packs are
+ * verified, so do not print any here.
+ */
+ return 0;
+ while (tree_entry_gently(&desc, &entry))
+ oidset_insert(set, &entry.oid);
+ if (we_parsed_object)
+ free_tree_buffer(tree);
+ } else if (obj->type == OBJ_COMMIT) {
+ struct commit *commit = (struct commit *) obj;
+ struct commit_list *parents = commit->parents;
+
+ oidset_insert(set, get_commit_tree_oid(commit));
+ for (; parents; parents = parents->next)
+ oidset_insert(set, &parents->item->object.oid);
+ } else if (obj->type == OBJ_TAG) {
+ struct tag *tag = (struct tag *) obj;
+ oidset_insert(set, get_tagged_oid(tag));
+ }
+ return 0;
+}
+
+int is_promisor_object(const struct object_id *oid)
+{
+ static struct oidset promisor_objects;
+ static int promisor_objects_prepared;
+
+ if (!promisor_objects_prepared) {
+ if (repo_has_promisor_remote(the_repository)) {
+ for_each_packed_object(add_promisor_object,
+ &promisor_objects,
+ FOR_EACH_OBJECT_PROMISOR_ONLY |
+ FOR_EACH_OBJECT_PACK_ORDER);
+ }
+ promisor_objects_prepared = 1;
+ }
+ return oidset_contains(&promisor_objects, oid);
+}