Code

builtin-fetch.c (store_updated_refs): Honor update_local_ref() return value
[git.git] / builtin-pack-objects.c
index d3efeff03f89cc0f4d0da463ddf878c28effb31e..70d2f5d4161a0bb62f4734be97d0a8dd2a5098dc 100644 (file)
@@ -8,14 +8,17 @@
 #include "tree.h"
 #include "delta.h"
 #include "pack.h"
+#include "pack-revindex.h"
 #include "csum-file.h"
 #include "tree-walk.h"
 #include "diff.h"
 #include "revision.h"
 #include "list-objects.h"
 #include "progress.h"
+#include "refs.h"
 
 #ifdef THREADED_DELTA_SEARCH
+#include "thread-utils.h"
 #include <pthread.h>
 #endif
 
@@ -25,7 +28,9 @@ git-pack-objects [{ -q | --progress | --all-progress }] \n\
        [--window=N] [--window-memory=N] [--depth=N] \n\
        [--no-reuse-delta] [--no-reuse-object] [--delta-base-offset] \n\
        [--threads=N] [--non-empty] [--revs [--unpacked | --all]*] [--reflog] \n\
-       [--stdout | base-name] [--keep-unreachable] [<ref-list | <object-list]";
+       [--stdout | base-name] [--include-tag] \n\
+       [--keep-unreachable | --unpack-unreachable] \n\
+       [<ref-list | <object-list]";
 
 struct object_entry {
        struct pack_idx_entry idx;
@@ -39,6 +44,7 @@ struct object_entry {
                                             */
        void *delta_data;       /* cached delta (uncompressed) */
        unsigned long delta_size;       /* delta data size (uncompressed) */
+       unsigned long z_delta_size;     /* delta data size (compressed) */
        unsigned int hash;      /* name hint hash */
        enum object_type type;
        enum object_type in_pack_type;  /* could be delta */
@@ -61,14 +67,15 @@ static struct pack_idx_entry **written_list;
 static uint32_t nr_objects, nr_alloc, nr_result, nr_written;
 
 static int non_empty;
-static int no_reuse_delta, no_reuse_object, keep_unreachable;
+static int reuse_delta = 1, reuse_object = 1;
+static int keep_unreachable, unpack_unreachable, include_tag;
 static int local;
 static int incremental;
 static int allow_ofs_delta;
 static const char *base_name;
 static int progress = 1;
 static int window = 10;
-static uint32_t pack_size_limit;
+static uint32_t pack_size_limit, pack_size_limit_cfg;
 static int depth = 50;
 static int delta_search_threads = 1;
 static int pack_to_stdout;
@@ -91,177 +98,60 @@ static unsigned long window_memory_limit = 0;
 static int *object_ix;
 static int object_ix_hashsz;
 
-/*
- * Pack index for existing packs give us easy access to the offsets into
- * corresponding pack file where each object's data starts, but the entries
- * do not store the size of the compressed representation (uncompressed
- * size is easily available by examining the pack entry header).  It is
- * also rather expensive to find the sha1 for an object given its offset.
- *
- * We build a hashtable of existing packs (pack_revindex), and keep reverse
- * index here -- pack index file is sorted by object name mapping to offset;
- * this pack_revindex[].revindex array is a list of offset/index_nr pairs
- * ordered by offset, so if you know the offset of an object, next offset
- * is where its packed representation ends and the index_nr can be used to
- * get the object sha1 from the main index.
- */
-struct revindex_entry {
-       off_t offset;
-       unsigned int nr;
-};
-struct pack_revindex {
-       struct packed_git *p;
-       struct revindex_entry *revindex;
-};
-static struct  pack_revindex *pack_revindex;
-static int pack_revindex_hashsz;
-
 /*
  * stats
  */
 static uint32_t written, written_delta;
 static uint32_t reused, reused_delta;
 
-static int pack_revindex_ix(struct packed_git *p)
-{
-       unsigned long ui = (unsigned long)p;
-       int i;
-
-       ui = ui ^ (ui >> 16); /* defeat structure alignment */
-       i = (int)(ui % pack_revindex_hashsz);
-       while (pack_revindex[i].p) {
-               if (pack_revindex[i].p == p)
-                       return i;
-               if (++i == pack_revindex_hashsz)
-                       i = 0;
-       }
-       return -1 - i;
-}
-
-static void prepare_pack_ix(void)
-{
-       int num;
-       struct packed_git *p;
-       for (num = 0, p = packed_git; p; p = p->next)
-               num++;
-       if (!num)
-               return;
-       pack_revindex_hashsz = num * 11;
-       pack_revindex = xcalloc(sizeof(*pack_revindex), pack_revindex_hashsz);
-       for (p = packed_git; p; p = p->next) {
-               num = pack_revindex_ix(p);
-               num = - 1 - num;
-               pack_revindex[num].p = p;
-       }
-       /* revindex elements are lazily initialized */
-}
-
-static int cmp_offset(const void *a_, const void *b_)
-{
-       const struct revindex_entry *a = a_;
-       const struct revindex_entry *b = b_;
-       return (a->offset < b->offset) ? -1 : (a->offset > b->offset) ? 1 : 0;
-}
-
-/*
- * Ordered list of offsets of objects in the pack.
- */
-static void prepare_pack_revindex(struct pack_revindex *rix)
-{
-       struct packed_git *p = rix->p;
-       int num_ent = p->num_objects;
-       int i;
-       const char *index = p->index_data;
-
-       rix->revindex = xmalloc(sizeof(*rix->revindex) * (num_ent + 1));
-       index += 4 * 256;
-
-       if (p->index_version > 1) {
-               const uint32_t *off_32 =
-                       (uint32_t *)(index + 8 + p->num_objects * (20 + 4));
-               const uint32_t *off_64 = off_32 + p->num_objects;
-               for (i = 0; i < num_ent; i++) {
-                       uint32_t off = ntohl(*off_32++);
-                       if (!(off & 0x80000000)) {
-                               rix->revindex[i].offset = off;
-                       } else {
-                               rix->revindex[i].offset =
-                                       ((uint64_t)ntohl(*off_64++)) << 32;
-                               rix->revindex[i].offset |=
-                                       ntohl(*off_64++);
-                       }
-                       rix->revindex[i].nr = i;
-               }
-       } else {
-               for (i = 0; i < num_ent; i++) {
-                       uint32_t hl = *((uint32_t *)(index + 24 * i));
-                       rix->revindex[i].offset = ntohl(hl);
-                       rix->revindex[i].nr = i;
-               }
-       }
-
-       /* This knows the pack format -- the 20-byte trailer
-        * follows immediately after the last object data.
-        */
-       rix->revindex[num_ent].offset = p->pack_size - 20;
-       rix->revindex[num_ent].nr = -1;
-       qsort(rix->revindex, num_ent, sizeof(*rix->revindex), cmp_offset);
-}
-
-static struct revindex_entry * find_packed_object(struct packed_git *p,
-                                                 off_t ofs)
-{
-       int num;
-       int lo, hi;
-       struct pack_revindex *rix;
-       struct revindex_entry *revindex;
-       num = pack_revindex_ix(p);
-       if (num < 0)
-               die("internal error: pack revindex uninitialized");
-       rix = &pack_revindex[num];
-       if (!rix->revindex)
-               prepare_pack_revindex(rix);
-       revindex = rix->revindex;
-       lo = 0;
-       hi = p->num_objects + 1;
-       do {
-               int mi = (lo + hi) / 2;
-               if (revindex[mi].offset == ofs) {
-                       return revindex + mi;
-               }
-               else if (ofs < revindex[mi].offset)
-                       hi = mi;
-               else
-                       lo = mi + 1;
-       } while (lo < hi);
-       die("internal error: pack revindex corrupt");
-}
-
-static const unsigned char *find_packed_object_name(struct packed_git *p,
-                                                   off_t ofs)
-{
-       struct revindex_entry *entry = find_packed_object(p, ofs);
-       return nth_packed_object_sha1(p, entry->nr);
-}
 
-static void *delta_against(void *buf, unsigned long size, struct object_entry *entry)
+static void *get_delta(struct object_entry *entry)
 {
-       unsigned long othersize, delta_size;
+       unsigned long size, base_size, delta_size;
+       void *buf, *base_buf, *delta_buf;
        enum object_type type;
-       void *otherbuf = read_sha1_file(entry->delta->idx.sha1, &type, &othersize);
-       void *delta_buf;
 
-       if (!otherbuf)
+       buf = read_sha1_file(entry->idx.sha1, &type, &size);
+       if (!buf)
+               die("unable to read %s", sha1_to_hex(entry->idx.sha1));
+       base_buf = read_sha1_file(entry->delta->idx.sha1, &type, &base_size);
+       if (!base_buf)
                die("unable to read %s", sha1_to_hex(entry->delta->idx.sha1));
-        delta_buf = diff_delta(otherbuf, othersize,
+       delta_buf = diff_delta(base_buf, base_size,
                               buf, size, &delta_size, 0);
-        if (!delta_buf || delta_size != entry->delta_size)
+       if (!delta_buf || delta_size != entry->delta_size)
                die("delta size changed");
-        free(buf);
-        free(otherbuf);
+       free(buf);
+       free(base_buf);
        return delta_buf;
 }
 
+static unsigned long do_compress(void **pptr, unsigned long size)
+{
+       z_stream stream;
+       void *in, *out;
+       unsigned long maxsize;
+
+       memset(&stream, 0, sizeof(stream));
+       deflateInit(&stream, pack_compression_level);
+       maxsize = deflateBound(&stream, size);
+
+       in = *pptr;
+       out = xmalloc(maxsize);
+       *pptr = out;
+
+       stream.next_in = in;
+       stream.avail_in = size;
+       stream.next_out = out;
+       stream.avail_out = maxsize;
+       while (deflate(&stream, Z_FINISH) == Z_OK)
+               ; /* nothing */
+       deflateEnd(&stream);
+
+       free(in);
+       return stream.total_out;
+}
+
 /*
  * The per-object header is a pretty dense thing, which is
  *  - first byte: low four bits are "size", then three bits of "type",
@@ -364,42 +254,42 @@ static unsigned long write_object(struct sha1file *f,
                                  struct object_entry *entry,
                                  off_t write_offset)
 {
-       unsigned long size;
-       enum object_type type;
+       unsigned long size, limit, datalen;
        void *buf;
-       unsigned char header[10];
-       unsigned char dheader[10];
+       unsigned char header[10], dheader[10];
        unsigned hdrlen;
-       off_t datalen;
-       enum object_type obj_type;
-       int to_reuse = 0;
-       /* write limit if limited packsize and not first object */
-       unsigned long limit = pack_size_limit && nr_written ?
-                               pack_size_limit - write_offset : 0;
-                               /* no if no delta */
-       int usable_delta =      !entry->delta ? 0 :
-                               /* yes if unlimited packfile */
-                               !pack_size_limit ? 1 :
-                               /* no if base written to previous pack */
-                               entry->delta->idx.offset == (off_t)-1 ? 0 :
-                               /* otherwise double-check written to this
-                                * pack,  like we do below
-                                */
-                               entry->delta->idx.offset ? 1 : 0;
+       enum object_type type;
+       int usable_delta, to_reuse;
 
        if (!pack_to_stdout)
                crc32_begin(f);
 
-       obj_type = entry->type;
-       if (no_reuse_object)
+       type = entry->type;
+
+       /* write limit if limited packsize and not first object */
+       limit = pack_size_limit && nr_written ?
+                       pack_size_limit - write_offset : 0;
+
+       if (!entry->delta)
+               usable_delta = 0;       /* no delta */
+       else if (!pack_size_limit)
+              usable_delta = 1;        /* unlimited packfile */
+       else if (entry->delta->idx.offset == (off_t)-1)
+               usable_delta = 0;       /* base was written to another pack */
+       else if (entry->delta->idx.offset)
+               usable_delta = 1;       /* base already exists in this pack */
+       else
+               usable_delta = 0;       /* base could end up in another pack */
+
+       if (!reuse_object)
                to_reuse = 0;   /* explicit */
        else if (!entry->in_pack)
                to_reuse = 0;   /* can't reuse what we don't have */
-       else if (obj_type == OBJ_REF_DELTA || obj_type == OBJ_OFS_DELTA)
+       else if (type == OBJ_REF_DELTA || type == OBJ_OFS_DELTA)
                                /* check_object() decided it for us ... */
                to_reuse = usable_delta;
                                /* ... but pack split may override that */
-       else if (obj_type != entry->in_pack_type)
+       else if (type != entry->in_pack_type)
                to_reuse = 0;   /* pack has delta which is unusable */
        else if (entry->delta)
                to_reuse = 0;   /* we want to pack afresh */
@@ -409,50 +299,42 @@ static unsigned long write_object(struct sha1file *f,
                                 */
 
        if (!to_reuse) {
-               z_stream stream;
-               unsigned long maxsize;
-               void *out;
                if (!usable_delta) {
-                       buf = read_sha1_file(entry->idx.sha1, &obj_type, &size);
+                       buf = read_sha1_file(entry->idx.sha1, &type, &size);
                        if (!buf)
                                die("unable to read %s", sha1_to_hex(entry->idx.sha1));
+                       /*
+                        * make sure no cached delta data remains from a
+                        * previous attempt before a pack split occured.
+                        */
+                       free(entry->delta_data);
+                       entry->delta_data = NULL;
+                       entry->z_delta_size = 0;
                } else if (entry->delta_data) {
                        size = entry->delta_size;
                        buf = entry->delta_data;
                        entry->delta_data = NULL;
-                       obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+                       type = (allow_ofs_delta && entry->delta->idx.offset) ?
                                OBJ_OFS_DELTA : OBJ_REF_DELTA;
                } else {
-                       buf = read_sha1_file(entry->idx.sha1, &type, &size);
-                       if (!buf)
-                               die("unable to read %s", sha1_to_hex(entry->idx.sha1));
-                       buf = delta_against(buf, size, entry);
+                       buf = get_delta(entry);
                        size = entry->delta_size;
-                       obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+                       type = (allow_ofs_delta && entry->delta->idx.offset) ?
                                OBJ_OFS_DELTA : OBJ_REF_DELTA;
                }
-               /* compress the data to store and put compressed length in datalen */
-               memset(&stream, 0, sizeof(stream));
-               deflateInit(&stream, pack_compression_level);
-               maxsize = deflateBound(&stream, size);
-               out = xmalloc(maxsize);
-               /* Compress it */
-               stream.next_in = buf;
-               stream.avail_in = size;
-               stream.next_out = out;
-               stream.avail_out = maxsize;
-               while (deflate(&stream, Z_FINISH) == Z_OK)
-                       /* nothing */;
-               deflateEnd(&stream);
-               datalen = stream.total_out;
+
+               if (entry->z_delta_size)
+                       datalen = entry->z_delta_size;
+               else
+                       datalen = do_compress(&buf, size);
 
                /*
                 * The object header is a byte of 'type' followed by zero or
                 * more bytes of length.
                 */
-               hdrlen = encode_header(obj_type, size, header);
+               hdrlen = encode_header(type, size, header);
 
-               if (obj_type == OBJ_OFS_DELTA) {
+               if (type == OBJ_OFS_DELTA) {
                        /*
                         * Deltas with relative base contain an additional
                         * encoding of the relative offset for the delta
@@ -464,20 +346,18 @@ static unsigned long write_object(struct sha1file *f,
                        while (ofs >>= 7)
                                dheader[--pos] = 128 | (--ofs & 127);
                        if (limit && hdrlen + sizeof(dheader) - pos + datalen + 20 >= limit) {
-                               free(out);
                                free(buf);
                                return 0;
                        }
                        sha1write(f, header, hdrlen);
                        sha1write(f, dheader + pos, sizeof(dheader) - pos);
                        hdrlen += sizeof(dheader) - pos;
-               } else if (obj_type == OBJ_REF_DELTA) {
+               } else if (type == OBJ_REF_DELTA) {
                        /*
                         * Deltas with a base reference contain
                         * an additional 20 bytes for the base sha1.
                         */
                        if (limit && hdrlen + 20 + datalen + 20 >= limit) {
-                               free(out);
                                free(buf);
                                return 0;
                        }
@@ -486,14 +366,12 @@ static unsigned long write_object(struct sha1file *f,
                        hdrlen += 20;
                } else {
                        if (limit && hdrlen + datalen + 20 >= limit) {
-                               free(out);
                                free(buf);
                                return 0;
                        }
                        sha1write(f, header, hdrlen);
                }
-               sha1write(f, out, datalen);
-               free(out);
+               sha1write(f, buf, datalen);
                free(buf);
        }
        else {
@@ -503,20 +381,20 @@ static unsigned long write_object(struct sha1file *f,
                off_t offset;
 
                if (entry->delta) {
-                       obj_type = (allow_ofs_delta && entry->delta->idx.offset) ?
+                       type = (allow_ofs_delta && entry->delta->idx.offset) ?
                                OBJ_OFS_DELTA : OBJ_REF_DELTA;
                        reused_delta++;
                }
-               hdrlen = encode_header(obj_type, entry->size, header);
+               hdrlen = encode_header(type, entry->size, header);
                offset = entry->in_pack_offset;
-               revidx = find_packed_object(p, offset);
+               revidx = find_pack_revindex(p, offset);
                datalen = revidx[1].offset - offset;
                if (!pack_to_stdout && p->index_version > 1 &&
                    check_pack_crc(p, &w_curs, offset, datalen, revidx->nr))
                        die("bad packed object CRC for %s", sha1_to_hex(entry->idx.sha1));
                offset += entry->in_pack_header_size;
                datalen -= entry->in_pack_header_size;
-               if (obj_type == OBJ_OFS_DELTA) {
+               if (type == OBJ_OFS_DELTA) {
                        off_t ofs = entry->idx.offset - entry->delta->idx.offset;
                        unsigned pos = sizeof(dheader) - 1;
                        dheader[pos] = ofs & 127;
@@ -527,7 +405,7 @@ static unsigned long write_object(struct sha1file *f,
                        sha1write(f, header, hdrlen);
                        sha1write(f, dheader + pos, sizeof(dheader) - pos);
                        hdrlen += sizeof(dheader) - pos;
-               } else if (obj_type == OBJ_REF_DELTA) {
+               } else if (type == OBJ_REF_DELTA) {
                        if (limit && hdrlen + 20 + datalen + 20 >= limit)
                                return 0;
                        sha1write(f, header, hdrlen);
@@ -594,10 +472,10 @@ static void write_pack_file(void)
        struct sha1file *f;
        off_t offset, offset_one, last_obj_offset = 0;
        struct pack_header hdr;
-       int do_progress = progress >> pack_to_stdout;
        uint32_t nr_remaining = nr_result;
+       time_t last_mtime = 0;
 
-       if (do_progress)
+       if (progress > pack_to_stdout)
                progress_state = start_progress("Writing objects", nr_result);
        written_list = xmalloc(nr_objects * sizeof(*written_list));
 
@@ -646,6 +524,7 @@ static void write_pack_file(void)
 
                if (!pack_to_stdout) {
                        mode_t mode = umask(0);
+                       struct stat st;
                        char *idx_tmp_name, tmpname[PATH_MAX];
 
                        umask(mode);
@@ -653,6 +532,7 @@ static void write_pack_file(void)
 
                        idx_tmp_name = write_idx_file(NULL, written_list,
                                                      nr_written, sha1);
+
                        snprintf(tmpname, sizeof(tmpname), "%s-%s.pack",
                                 base_name, sha1_to_hex(sha1));
                        if (adjust_perm(pack_tmp_name, mode))
@@ -661,6 +541,28 @@ static void write_pack_file(void)
                        if (rename(pack_tmp_name, tmpname))
                                die("unable to rename temporary pack file: %s",
                                    strerror(errno));
+
+                       /*
+                        * Packs are runtime accessed in their mtime
+                        * order since newer packs are more likely to contain
+                        * younger objects.  So if we are creating multiple
+                        * packs then we should modify the mtime of later ones
+                        * to preserve this property.
+                        */
+                       if (stat(tmpname, &st) < 0) {
+                               warning("failed to stat %s: %s",
+                                       tmpname, strerror(errno));
+                       } else if (!last_mtime) {
+                               last_mtime = st.st_mtime;
+                       } else {
+                               struct utimbuf utb;
+                               utb.actime = st.st_atime;
+                               utb.modtime = --last_mtime;
+                               if (utime(tmpname, &utb) < 0)
+                                       warning("failed utime() on %s: %s",
+                                               tmpname, strerror(errno));
+                       }
+
                        snprintf(tmpname, sizeof(tmpname), "%s-%s.idx",
                                 base_name, sha1_to_hex(sha1));
                        if (adjust_perm(idx_tmp_name, mode))
@@ -669,6 +571,7 @@ static void write_pack_file(void)
                        if (rename(idx_tmp_name, tmpname))
                                die("unable to rename temporary index file: %s",
                                    strerror(errno));
+
                        free(idx_tmp_name);
                        free(pack_tmp_name);
                        puts(sha1_to_hex(sha1));
@@ -1138,7 +1041,7 @@ static void check_object(struct object_entry *entry)
                        unuse_pack(&w_curs);
                        return;
                case OBJ_REF_DELTA:
-                       if (!no_reuse_delta && !entry->preferred_base)
+                       if (reuse_delta && !entry->preferred_base)
                                base_ref = use_pack(p, &w_curs,
                                                entry->in_pack_offset + used, NULL);
                        entry->in_pack_header_size = used + 20;
@@ -1161,8 +1064,11 @@ static void check_object(struct object_entry *entry)
                                die("delta base offset out of bound for %s",
                                    sha1_to_hex(entry->idx.sha1));
                        ofs = entry->in_pack_offset - ofs;
-                       if (!no_reuse_delta && !entry->preferred_base)
-                               base_ref = find_packed_object_name(p, ofs);
+                       if (reuse_delta && !entry->preferred_base) {
+                               struct revindex_entry *revidx;
+                               revidx = find_pack_revindex(p, ofs);
+                               base_ref = nth_packed_object_sha1(p, revidx->nr);
+                       }
                        entry->in_pack_header_size = used + used_0;
                        break;
                }
@@ -1239,9 +1145,11 @@ static void get_object_details(void)
                sorted_by_offset[i] = objects + i;
        qsort(sorted_by_offset, nr_objects, sizeof(*sorted_by_offset), pack_offset_sort);
 
-       prepare_pack_ix();
+       init_pack_revindex();
+
        for (i = 0; i < nr_objects; i++)
                check_object(sorted_by_offset[i]);
+
        free(sorted_by_offset);
 }
 
@@ -1344,7 +1252,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
         * We do not bother to try a delta that we discarded
         * on an earlier try, but only when reusing delta data.
         */
-       if (!no_reuse_delta && trg_entry->in_pack &&
+       if (reuse_delta && trg_entry->in_pack &&
            trg_entry->in_pack == src_entry->in_pack &&
            trg_entry->in_pack_type != OBJ_REF_DELTA &&
            trg_entry->in_pack_type != OBJ_OFS_DELTA)
@@ -1428,8 +1336,7 @@ static int try_delta(struct unpacked *trg, struct unpacked *src,
         * accounting lock.  Compiler will optimize the strangeness
         * away when THREADED_DELTA_SEARCH is not defined.
         */
-       if (trg_entry->delta_data)
-               free(trg_entry->delta_data);
+       free(trg_entry->delta_data);
        cache_lock();
        if (trg_entry->delta_data) {
                delta_cache_size -= trg_entry->delta_size;
@@ -1553,11 +1460,34 @@ static void find_deltas(struct object_entry **list, unsigned *list_size,
                                best_base = other_idx;
                }
 
+               /*
+                * If we decided to cache the delta data, then it is best
+                * to compress it right away.  First because we have to do
+                * it anyway, and doing it here while we're threaded will
+                * save a lot of time in the non threaded write phase,
+                * as well as allow for caching more deltas within
+                * the same cache size limit.
+                * ...
+                * But only if not writing to stdout, since in that case
+                * the network is most likely throttling writes anyway,
+                * and therefore it is best to go to the write phase ASAP
+                * instead, as we can afford spending more time compressing
+                * between writes at that moment.
+                */
+               if (entry->delta_data && !pack_to_stdout) {
+                       entry->z_delta_size = do_compress(&entry->delta_data,
+                                                         entry->delta_size);
+                       cache_lock();
+                       delta_cache_size -= entry->delta_size;
+                       delta_cache_size += entry->z_delta_size;
+                       cache_unlock();
+               }
+
                /* if we made n a delta, and if n is already at max
                 * depth, leaving it in the window is pointless.  we
                 * should evict it first.
                 */
-               if (entry->delta && depth <= n->depth)
+               if (entry->delta && max_depth <= n->depth)
                        continue;
 
                /*
@@ -1770,6 +1700,18 @@ static void ll_find_deltas(struct object_entry **list, unsigned list_size,
 #define ll_find_deltas(l, s, w, d, p)  find_deltas(l, &s, w, d, p)
 #endif
 
+static int add_ref_tag(const char *path, const unsigned char *sha1, int flag, void *cb_data)
+{
+       unsigned char peeled[20];
+
+       if (!prefixcmp(path, "refs/tags/") && /* is a tag? */
+           !peel_ref(path, peeled)        && /* peelable? */
+           !is_null_sha1(peeled)          && /* annotated tag? */
+           locate_object_entry(peeled))      /* object packed? */
+               add_object_entry(sha1, OBJ_TAG, NULL, 0);
+       return 0;
+}
+
 static void prepare_pack(int window, int depth)
 {
        struct object_entry **delta_list;
@@ -1788,7 +1730,7 @@ static void prepare_pack(int window, int depth)
 
                if (entry->delta)
                        /* This happens if we decided to reuse existing
-                        * delta from a pack.  "!no_reuse_delta &&" is implied.
+                        * delta from a pack.  "reuse_delta &&" is implied.
                         */
                        continue;
 
@@ -1818,7 +1760,7 @@ static void prepare_pack(int window, int depth)
        free(delta_list);
 }
 
-static int git_pack_config(const char *k, const char *v)
+static int git_pack_config(const char *k, const char *v, void *cb)
 {
        if(!strcmp(k, "pack.window")) {
                window = git_config_int(k, v);
@@ -1852,11 +1794,11 @@ static int git_pack_config(const char *k, const char *v)
        }
        if (!strcmp(k, "pack.threads")) {
                delta_search_threads = git_config_int(k, v);
-               if (delta_search_threads < 1)
+               if (delta_search_threads < 0)
                        die("invalid number of threads specified (%d)",
                            delta_search_threads);
 #ifndef THREADED_DELTA_SEARCH
-               if (delta_search_threads > 1)
+               if (delta_search_threads != 1)
                        warning("no threads support, ignoring %s", k);
 #endif
                return 0;
@@ -1867,7 +1809,11 @@ static int git_pack_config(const char *k, const char *v)
                        die("bad pack.indexversion=%d", pack_idx_default_version);
                return 0;
        }
-       return git_default_config(k, v);
+       if (!strcmp(k, "pack.packsizelimit")) {
+               pack_size_limit_cfg = git_config_ulong(k, v);
+               return 0;
+       }
+       return git_default_config(k, v, cb);
 }
 
 static void read_object_list_from_stdin(void)
@@ -2001,6 +1947,32 @@ static void add_objects_in_unpacked_packs(struct rev_info *revs)
        free(in_pack.array);
 }
 
+static void loosen_unused_packed_objects(struct rev_info *revs)
+{
+       struct packed_git *p;
+       uint32_t i;
+       const unsigned char *sha1;
+
+       for (p = packed_git; p; p = p->next) {
+               for (i = 0; i < revs->num_ignore_packed; i++) {
+                       if (matches_pack_name(p, revs->ignore_packed[i]))
+                               break;
+               }
+               if (revs->num_ignore_packed <= i)
+                       continue;
+
+               if (open_pack_index(p))
+                       die("cannot open pack index");
+
+               for (i = 0; i < p->num_objects; i++) {
+                       sha1 = nth_packed_object_sha1(p, i);
+                       if (!locate_object_entry(sha1))
+                               if (force_object_loose(sha1, p->mtime))
+                                       die("unable to force loose object");
+               }
+       }
+}
+
 static void get_object_list(int ac, const char **av)
 {
        struct rev_info revs;
@@ -2009,7 +1981,6 @@ static void get_object_list(int ac, const char **av)
 
        init_revisions(&revs, NULL);
        save_commit_buffer = 0;
-       track_object_refs = 0;
        setup_revisions(ac, av, &revs, NULL);
 
        while (fgets(line, sizeof(line), stdin) != NULL) {
@@ -2029,12 +2000,15 @@ static void get_object_list(int ac, const char **av)
                        die("bad revision '%s'", line);
        }
 
-       prepare_revision_walk(&revs);
+       if (prepare_revision_walk(&revs))
+               die("revision walk setup failed");
        mark_edges_uninteresting(revs.commits, &revs, show_edge);
        traverse_commit_list(&revs, show_commit, show_object);
 
        if (keep_unreachable)
                add_objects_in_unpacked_packs(&revs);
+       if (unpack_unreachable)
+               loosen_unused_packed_objects(&revs);
 }
 
 static int adjust_perm(const char *path, mode_t mode)
@@ -2059,7 +2033,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
        rp_av[1] = "--objects"; /* --thin will make it --objects-edge */
        rp_ac = 2;
 
-       git_config(git_pack_config);
+       git_config(git_pack_config, NULL);
        if (!pack_compression_seen && core_compression_seen)
                pack_compression_level = core_compression_level;
 
@@ -2096,6 +2070,7 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                }
                if (!prefixcmp(arg, "--max-pack-size=")) {
                        char *end;
+                       pack_size_limit_cfg = 0;
                        pack_size_limit = strtoul(arg+16, &end, 0) * 1024 * 1024;
                        if (!arg[16] || *end)
                                usage(pack_usage);
@@ -2116,10 +2091,10 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                if (!prefixcmp(arg, "--threads=")) {
                        char *end;
                        delta_search_threads = strtoul(arg+10, &end, 0);
-                       if (!arg[10] || *end || delta_search_threads < 1)
+                       if (!arg[10] || *end || delta_search_threads < 0)
                                usage(pack_usage);
 #ifndef THREADED_DELTA_SEARCH
-                       if (delta_search_threads > 1)
+                       if (delta_search_threads != 1)
                                warning("no threads support, "
                                        "ignoring %s", arg);
 #endif
@@ -2145,11 +2120,11 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                        continue;
                }
                if (!strcmp("--no-reuse-delta", arg)) {
-                       no_reuse_delta = 1;
+                       reuse_delta = 0;
                        continue;
                }
                if (!strcmp("--no-reuse-object", arg)) {
-                       no_reuse_object = no_reuse_delta = 1;
+                       reuse_object = reuse_delta = 0;
                        continue;
                }
                if (!strcmp("--delta-base-offset", arg)) {
@@ -2168,6 +2143,14 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                        keep_unreachable = 1;
                        continue;
                }
+               if (!strcmp("--unpack-unreachable", arg)) {
+                       unpack_unreachable = 1;
+                       continue;
+               }
+               if (!strcmp("--include-tag", arg)) {
+                       include_tag = 1;
+                       continue;
+               }
                if (!strcmp("--unpacked", arg) ||
                    !prefixcmp(arg, "--unpacked=") ||
                    !strcmp("--reflog", arg) ||
@@ -2220,12 +2203,23 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
        if (pack_to_stdout != !base_name)
                usage(pack_usage);
 
+       if (!pack_to_stdout && !pack_size_limit)
+               pack_size_limit = pack_size_limit_cfg;
+
        if (pack_to_stdout && pack_size_limit)
                die("--max-pack-size cannot be used to build a pack for transfer.");
 
        if (!pack_to_stdout && thin)
                die("--thin cannot be used to build an indexable pack.");
 
+       if (keep_unreachable && unpack_unreachable)
+               die("--keep-unreachable and --unpack-unreachable are incompatible.");
+
+#ifdef THREADED_DELTA_SEARCH
+       if (!delta_search_threads)      /* --threads=0 means autodetect */
+               delta_search_threads = online_cpus();
+#endif
+
        prepare_packed_git();
 
        if (progress)
@@ -2236,6 +2230,8 @@ int cmd_pack_objects(int argc, const char **argv, const char *prefix)
                rp_av[rp_ac] = NULL;
                get_object_list(rp_ac, rp_av);
        }
+       if (include_tag && nr_result)
+               for_each_ref(add_ref_tag, NULL);
        stop_progress(&progress_state);
 
        if (non_empty && !nr_result)