| 1 | #include "git-compat-util.h" |
| 2 | #include "repack.h" |
| 3 | #include "hex.h" |
| 4 | #include "pack.h" |
| 5 | #include "packfile.h" |
| 6 | #include "path.h" |
| 7 | #include "repository.h" |
| 8 | #include "run-command.h" |
| 9 | #include "oidset.h" |
| 10 | |
| 11 | struct write_oid_context { |
| 12 | struct child_process *cmd; |
| 13 | const struct git_hash_algo *algop; |
| 14 | const struct oidset *to_drop; |
| 15 | }; |
| 16 | |
| 17 | /* |
| 18 | * Write oid to the given struct child_process's stdin, starting it first if |
| 19 | * necessary. |
| 20 | */ |
| 21 | static int write_oid(const struct object_id *oid, |
| 22 | struct object_info *oi UNUSED, |
| 23 | void *data) |
| 24 | { |
| 25 | struct write_oid_context *ctx = data; |
| 26 | struct child_process *cmd = ctx->cmd; |
| 27 | |
| 28 | /* |
| 29 | * Objects in to_drop are being removed from the repository, so |
| 30 | * omit them from the rebuilt promisor pack. Each such object is a |
| 31 | * promisor object and therefore remains recoverable from the |
| 32 | * promisor remote. |
| 33 | */ |
| 34 | if (ctx->to_drop && oidset_contains(ctx->to_drop, oid)) |
| 35 | return 0; |
| 36 | |
| 37 | if (cmd->in == -1) { |
| 38 | if (start_command(cmd)) |
| 39 | die(_("could not start pack-objects to repack promisor objects")); |
| 40 | } |
| 41 | |
| 42 | if (write_in_full(cmd->in, oid_to_hex(oid), ctx->algop->hexsz) < 0 || |
| 43 | write_in_full(cmd->in, "\n", 1) < 0) |
| 44 | die(_("failed to feed promisor objects to pack-objects")); |
| 45 | return 0; |
| 46 | } |
| 47 | |
| 48 | static void finish_repacking_promisor_objects(struct repository *repo, |
| 49 | struct child_process *cmd, |
| 50 | struct string_list *names, |
| 51 | const char *packtmp) |
| 52 | { |
| 53 | struct strbuf line = STRBUF_INIT; |
| 54 | FILE *out; |
| 55 | |
| 56 | close(cmd->in); |
| 57 | |
| 58 | out = xfdopen(cmd->out, "r"); |
| 59 | while (strbuf_getline_lf(&line, out) != EOF) { |
| 60 | struct string_list_item *item; |
| 61 | char *promisor_name; |
| 62 | |
| 63 | if (line.len != repo->hash_algo->hexsz) |
| 64 | die(_("repack: Expecting full hex object ID lines only from pack-objects.")); |
| 65 | item = string_list_append(names, line.buf); |
| 66 | |
| 67 | /* |
| 68 | * pack-objects creates the .pack and .idx files, but not the |
| 69 | * .promisor file. Create the .promisor file, which is empty. |
| 70 | * |
| 71 | * NEEDSWORK: fetch-pack sometimes generates non-empty |
| 72 | * .promisor files containing the ref names and associated |
| 73 | * hashes at the point of generation of the corresponding |
| 74 | * packfile, but this would not preserve their contents. Maybe |
| 75 | * concatenate the contents of all .promisor files instead of |
| 76 | * just creating a new empty file. |
| 77 | */ |
| 78 | promisor_name = mkpathdup("%s-%s.promisor", packtmp, |
| 79 | line.buf); |
| 80 | write_promisor_file(promisor_name, NULL, 0); |
| 81 | |
| 82 | item->util = generated_pack_populate(item->string, packtmp); |
| 83 | |
| 84 | free(promisor_name); |
| 85 | } |
| 86 | |
| 87 | fclose(out); |
| 88 | if (finish_command(cmd)) |
| 89 | die(_("could not finish pack-objects to repack promisor objects")); |
| 90 | strbuf_release(&line); |
| 91 | } |
| 92 | |
| 93 | void repack_promisor_objects(struct repository *repo, |
| 94 | const struct pack_objects_args *args, |
| 95 | struct string_list *names, const char *packtmp, |
| 96 | const struct oidset *to_drop) |
| 97 | { |
| 98 | struct write_oid_context ctx; |
| 99 | struct child_process cmd = CHILD_PROCESS_INIT; |
| 100 | |
| 101 | prepare_pack_objects(&cmd, args, packtmp); |
| 102 | cmd.in = -1; |
| 103 | |
| 104 | /* |
| 105 | * NEEDSWORK: Giving pack-objects only the OIDs without any ordering |
| 106 | * hints may result in suboptimal deltas in the resulting pack. See if |
| 107 | * the OIDs can be sent with fake paths such that pack-objects can use a |
| 108 | * {type -> existing pack order} ordering when computing deltas instead |
| 109 | * of a {type -> size} ordering, which may produce better deltas. |
| 110 | */ |
| 111 | ctx.cmd = &cmd; |
| 112 | ctx.algop = repo->hash_algo; |
| 113 | ctx.to_drop = to_drop; |
| 114 | odb_for_each_object(repo->objects, NULL, write_oid, &ctx, |
| 115 | ODB_FOR_EACH_OBJECT_PROMISOR_ONLY); |
| 116 | |
| 117 | if (cmd.in == -1) { |
| 118 | /* No packed objects; cmd was never started */ |
| 119 | child_process_clear(&cmd); |
| 120 | return; |
| 121 | } |
| 122 | |
| 123 | finish_repacking_promisor_objects(repo, &cmd, names, packtmp); |
| 124 | } |
| 125 | |
| 126 | void pack_geometry_repack_promisors(struct repository *repo, |
| 127 | const struct pack_objects_args *args, |
| 128 | const struct pack_geometry *geometry, |
| 129 | struct string_list *names, |
| 130 | const char *packtmp) |
| 131 | { |
| 132 | struct child_process cmd = CHILD_PROCESS_INIT; |
| 133 | FILE *in; |
| 134 | |
| 135 | if (!geometry->promisor_split) |
| 136 | return; |
| 137 | |
| 138 | prepare_pack_objects(&cmd, args, packtmp); |
| 139 | strvec_push(&cmd.args, "--stdin-packs"); |
| 140 | cmd.in = -1; |
| 141 | if (start_command(&cmd)) |
| 142 | die(_("could not start pack-objects to repack promisor packs")); |
| 143 | |
| 144 | in = xfdopen(cmd.in, "w"); |
| 145 | for (size_t i = 0; i < geometry->promisor_split; i++) |
| 146 | fprintf(in, "%s\n", pack_basename(geometry->promisor_pack[i])); |
| 147 | for (size_t i = geometry->promisor_split; i < geometry->promisor_pack_nr; i++) |
| 148 | fprintf(in, "^%s\n", pack_basename(geometry->promisor_pack[i])); |
| 149 | fclose(in); |
| 150 | |
| 151 | finish_repacking_promisor_objects(repo, &cmd, names, packtmp); |
| 152 | } |