git.oblomov.eu Git - git/blob - builtin/commit-graph.c

   1 #include "builtin.h"
   2 #include "config.h"
   3 #include "dir.h"
   4 #include "lockfile.h"
   5 #include "parse-options.h"
   6 #include "commit-graph.h"
   7
   8 static char const * const builtin_commit_graph_usage[] = {
   9         N_("git commit-graph [--object-dir <objdir>]"),
  10         N_("git commit-graph read [--object-dir <objdir>] [--file=<hash>]"),
  11         N_("git commit-graph write [--object-dir <objdir>] [--set-latest] [--delete-expired]"),
  12         NULL
  13 };
  14
  15 static const char * const builtin_commit_graph_read_usage[] = {
  16         N_("git commit-graph read [--object-dir <objdir>] [--file=<hash>]"),
  17         NULL
  18 };
  19
  20 static const char * const builtin_commit_graph_write_usage[] = {
  21         N_("git commit-graph write [--object-dir <objdir>] [--set-latest] [--delete-expired]"),
  22         NULL
  23 };
  24
  25 static struct opts_commit_graph {
  26         const char *obj_dir;
  27         const char *graph_file;
  28         int set_latest;
  29         int delete_expired;
  30 } opts;
  31
  32 static int graph_read(int argc, const char **argv)
  33 {
  34         struct commit_graph *graph = 0;
  35         struct strbuf full_path = STRBUF_INIT;
  36
  37         static struct option builtin_commit_graph_read_options[] = {
  38                 { OPTION_STRING, 'o', "object-dir", &opts.obj_dir,
  39                         N_("dir"),
  40                         N_("The object directory to store the graph") },
  41                 { OPTION_STRING, 'H', "file", &opts.graph_file,
  42                         N_("file"),
  43                         N_("The filename for a specific commit graph file in the object directory."),
  44                         PARSE_OPT_OPTARG, NULL, (intptr_t) "" },
  45                 OPT_END(),
  46         };
  47
  48         argc = parse_options(argc, argv, NULL,
  49                              builtin_commit_graph_read_options,
  50                              builtin_commit_graph_read_usage, 0);
  51
  52         if (!opts.obj_dir)
  53                 opts.obj_dir = get_object_directory();
  54
  55         if (!opts.graph_file)
  56                 die("no graph hash specified");
  57
  58         strbuf_addf(&full_path, "%s/info/%s", opts.obj_dir, opts.graph_file);
  59         graph = load_commit_graph_one(full_path.buf);
  60
  61         if (!graph)
  62                 die("graph file %s does not exist", full_path.buf);
  63
  64         printf("header: %08x %d %d %d %d\n",
  65                 ntohl(*(uint32_t*)graph->data),
  66                 *(unsigned char*)(graph->data + 4),
  67                 *(unsigned char*)(graph->data + 5),
  68                 *(unsigned char*)(graph->data + 6),
  69                 *(unsigned char*)(graph->data + 7));
  70         printf("num_commits: %u\n", graph->num_commits);
  71         printf("chunks:");
  72
  73         if (graph->chunk_oid_fanout)
  74                 printf(" oid_fanout");
  75         if (graph->chunk_oid_lookup)
  76                 printf(" oid_lookup");
  77         if (graph->chunk_commit_data)
  78                 printf(" commit_metadata");
  79         if (graph->chunk_large_edges)
  80                 printf(" large_edges");
  81         printf("\n");
  82
  83         return 0;
  84 }
  85
  86 static void set_latest_file(const char *obj_dir, const char *graph_file)
  87 {
  88         int fd;
  89         struct lock_file lk = LOCK_INIT;
  90         char *latest_fname = get_graph_latest_filename(obj_dir);
  91
  92         fd = hold_lock_file_for_update(&lk, latest_fname, LOCK_DIE_ON_ERROR);
  93         FREE_AND_NULL(latest_fname);
  94
  95         if (fd < 0)
  96                 die_errno("unable to open graph-head");
  97
  98         write_in_full(fd, graph_file, strlen(graph_file));
  99         commit_lock_file(&lk);
 100 }
 101
 102 /*
 103  * To avoid race conditions and deleting graph files that are being
 104  * used by other processes, look inside a pack directory for all files
 105  * of the form "graph-<hash>.graph" that do not match the old or new
 106  * graph hashes and delete them.
 107  */
 108 static void do_delete_expired(const char *obj_dir,
 109                               const char *old_graph_name,
 110                               const char *new_graph_name)
 111 {
 112         DIR *dir;
 113         struct dirent *de;
 114         int dirnamelen;
 115         struct strbuf path = STRBUF_INIT;
 116
 117         strbuf_addf(&path, "%s/info", obj_dir);
 118         dir = opendir(path.buf);
 119         if (!dir) {
 120                 if (errno != ENOENT)
 121                         error_errno("unable to open object pack directory: %s",
 122                                     obj_dir);
 123                 return;
 124         }
 125
 126         strbuf_addch(&path, '/');
 127         dirnamelen = path.len;
 128         while ((de = readdir(dir)) != NULL) {
 129                 size_t base_len;
 130
 131                 if (is_dot_or_dotdot(de->d_name))
 132                         continue;
 133
 134                 strbuf_setlen(&path, dirnamelen);
 135                 strbuf_addstr(&path, de->d_name);
 136
 137                 base_len = path.len;
 138                 if (strip_suffix_mem(path.buf, &base_len, ".graph") &&
 139                     strcmp(new_graph_name, de->d_name) &&
 140                     (!old_graph_name || strcmp(old_graph_name, de->d_name)) &&
 141                     remove_path(path.buf))
 142                         die("failed to remove path %s", path.buf);
 143         }
 144
 145         strbuf_release(&path);
 146 }
 147
 148 static int graph_write(int argc, const char **argv)
 149 {
 150         char *graph_name;
 151         char *old_graph_name;
 152
 153         static struct option builtin_commit_graph_write_options[] = {
 154                 { OPTION_STRING, 'o', "object-dir", &opts.obj_dir,
 155                         N_("dir"),
 156                         N_("The object directory to store the graph") },
 157                 OPT_BOOL('u', "set-latest", &opts.set_latest,
 158                         N_("update graph-head to written graph file")),
 159                 OPT_BOOL('d', "delete-expired", &opts.delete_expired,
 160                         N_("delete expired head graph file")),
 161                 OPT_END(),
 162         };
 163
 164         argc = parse_options(argc, argv, NULL,
 165                              builtin_commit_graph_write_options,
 166                              builtin_commit_graph_write_usage, 0);
 167
 168         if (!opts.obj_dir)
 169                 opts.obj_dir = get_object_directory();
 170
 171         old_graph_name = get_graph_latest_contents(opts.obj_dir);
 172
 173         graph_name = write_commit_graph(opts.obj_dir);
 174
 175         if (graph_name) {
 176                 if (opts.set_latest)
 177                         set_latest_file(opts.obj_dir, graph_name);
 178
 179                 if (opts.delete_expired)
 180                         do_delete_expired(opts.obj_dir,
 181                                           old_graph_name,
 182                                           graph_name);
 183
 184                 printf("%s\n", graph_name);
 185                 FREE_AND_NULL(graph_name);
 186         }
 187
 188         return 0;
 189 }
 190
 191 int cmd_commit_graph(int argc, const char **argv, const char *prefix)
 192 {
 193         static struct option builtin_commit_graph_options[] = {
 194                 { OPTION_STRING, 'o', "object-dir", &opts.obj_dir,
 195                         N_("dir"),
 196                         N_("The object directory to store the graph") },
 197                 OPT_END(),
 198         };
 199
 200         if (argc == 2 && !strcmp(argv[1], "-h"))
 201                 usage_with_options(builtin_commit_graph_usage,
 202                                    builtin_commit_graph_options);
 203
 204         git_config(git_default_config, NULL);
 205         argc = parse_options(argc, argv, prefix,
 206                              builtin_commit_graph_options,
 207                              builtin_commit_graph_usage,
 208                              PARSE_OPT_STOP_AT_NON_OPTION);
 209
 210         if (argc > 0) {
 211                 if (!strcmp(argv[0], "read"))
 212                         return graph_read(argc, argv);
 213                 if (!strcmp(argv[0], "write"))
 214                         return graph_write(argc, argv);
 215         }
 216
 217         usage_with_options(builtin_commit_graph_usage,
 218                            builtin_commit_graph_options);
 219 }