receive-pack.c

   1 #include "cache.h"
   2 #include "refs.h"
   3 #include "pkt-line.h"
   4 #include "run-command.h"
   5
   6 static const char receive_pack_usage[] = "git-receive-pack <git-dir>";
   7
   8 static const char *unpacker[] = { "unpack-objects", NULL };
   9
  10 static int report_status;
  11
  12 static char capabilities[] = "report-status";
  13 static int capabilities_sent;
  14
  15 static int show_ref(const char *path, const unsigned char *sha1, int flag, void *cb_data)
  16 {
  17         if (capabilities_sent)
  18                 packet_write(1, "%s %s\n", sha1_to_hex(sha1), path);
  19         else
  20                 packet_write(1, "%s %s%c%s\n",
  21                              sha1_to_hex(sha1), path, 0, capabilities);
  22         capabilities_sent = 1;
  23         return 0;
  24 }
  25
  26 static void write_head_info(void)
  27 {
  28         for_each_ref(show_ref, NULL);
  29         if (!capabilities_sent)
  30                 show_ref("capabilities^{}", null_sha1, 0, NULL);
  31
  32 }
  33
  34 struct command {
  35         struct command *next;
  36         const char *error_string;
  37         unsigned char old_sha1[20];
  38         unsigned char new_sha1[20];
  39         char ref_name[FLEX_ARRAY]; /* more */
  40 };
  41
  42 static struct command *commands;
  43
  44 static char update_hook[] = "hooks/update";
  45
  46 static int run_update_hook(const char *refname,
  47                            char *old_hex, char *new_hex)
  48 {
  49         int code;
  50
  51         if (access(update_hook, X_OK) < 0)
  52                 return 0;
  53         code = run_command(update_hook, refname, old_hex, new_hex, NULL);
  54         switch (code) {
  55         case 0:
  56                 return 0;
  57         case -ERR_RUN_COMMAND_FORK:
  58                 return error("hook fork failed");
  59         case -ERR_RUN_COMMAND_EXEC:
  60                 return error("hook execute failed");
  61         case -ERR_RUN_COMMAND_WAITPID:
  62                 return error("waitpid failed");
  63         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
  64                 return error("waitpid is confused");
  65         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
  66                 return error("%s died of signal", update_hook);
  67         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
  68                 return error("%s died strangely", update_hook);
  69         default:
  70                 error("%s exited with error code %d", update_hook, -code);
  71                 return -code;
  72         }
  73 }
  74
  75 static int update(struct command *cmd)
  76 {
  77         const char *name = cmd->ref_name;
  78         unsigned char *old_sha1 = cmd->old_sha1;
  79         unsigned char *new_sha1 = cmd->new_sha1;
  80         char new_hex[41], old_hex[41];
  81         struct ref_lock *lock;
  82
  83         cmd->error_string = NULL;
  84         if (!strncmp(name, "refs/", 5) && check_ref_format(name + 5)) {
  85                 cmd->error_string = "funny refname";
  86                 return error("refusing to create funny ref '%s' locally",
  87                              name);
  88         }
  89
  90         strcpy(new_hex, sha1_to_hex(new_sha1));
  91         strcpy(old_hex, sha1_to_hex(old_sha1));
  92         if (!has_sha1_file(new_sha1)) {
  93                 cmd->error_string = "bad pack";
  94                 return error("unpack should have generated %s, "
  95                              "but I can't find it!", new_hex);
  96         }
  97         if (run_update_hook(name, old_hex, new_hex)) {
  98                 cmd->error_string = "hook declined";
  99                 return error("hook declined to update %s", name);
 100         }
 101
 102         lock = lock_any_ref_for_update(name, old_sha1);
 103         if (!lock) {
 104                 cmd->error_string = "failed to lock";
 105                 return error("failed to lock %s", name);
 106         }
 107         write_ref_sha1(lock, new_sha1, "push");
 108
 109         fprintf(stderr, "%s: %s -> %s\n", name, old_hex, new_hex);
 110         return 0;
 111 }
 112
 113 static char update_post_hook[] = "hooks/post-update";
 114
 115 static void run_update_post_hook(struct command *cmd)
 116 {
 117         struct command *cmd_p;
 118         int argc;
 119         const char **argv;
 120
 121         if (access(update_post_hook, X_OK) < 0)
 122                 return;
 123         for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 124                 if (cmd_p->error_string)
 125                         continue;
 126                 argc++;
 127         }
 128         argv = xmalloc(sizeof(*argv) * (1 + argc));
 129         argv[0] = update_post_hook;
 130
 131         for (argc = 1, cmd_p = cmd; cmd_p; cmd_p = cmd_p->next) {
 132                 char *p;
 133                 if (cmd_p->error_string)
 134                         continue;
 135                 p = xmalloc(strlen(cmd_p->ref_name) + 1);
 136                 strcpy(p, cmd_p->ref_name);
 137                 argv[argc] = p;
 138                 argc++;
 139         }
 140         argv[argc] = NULL;
 141         run_command_v_opt(argc, argv, RUN_COMMAND_NO_STDIO);
 142 }
 143
 144 /*
 145  * This gets called after(if) we've successfully
 146  * unpacked the data payload.
 147  */
 148 static void execute_commands(void)
 149 {
 150         struct command *cmd = commands;
 151
 152         while (cmd) {
 153                 update(cmd);
 154                 cmd = cmd->next;
 155         }
 156         run_update_post_hook(commands);
 157 }
 158
 159 static void read_head_info(void)
 160 {
 161         struct command **p = &commands;
 162         for (;;) {
 163                 static char line[1000];
 164                 unsigned char old_sha1[20], new_sha1[20];
 165                 struct command *cmd;
 166                 char *refname;
 167                 int len, reflen;
 168
 169                 len = packet_read_line(0, line, sizeof(line));
 170                 if (!len)
 171                         break;
 172                 if (line[len-1] == '\n')
 173                         line[--len] = 0;
 174                 if (len < 83 ||
 175                     line[40] != ' ' ||
 176                     line[81] != ' ' ||
 177                     get_sha1_hex(line, old_sha1) ||
 178                     get_sha1_hex(line + 41, new_sha1))
 179                         die("protocol error: expected old/new/ref, got '%s'",
 180                             line);
 181
 182                 refname = line + 82;
 183                 reflen = strlen(refname);
 184                 if (reflen + 82 < len) {
 185                         if (strstr(refname + reflen + 1, "report-status"))
 186                                 report_status = 1;
 187                 }
 188                 cmd = xmalloc(sizeof(struct command) + len - 80);
 189                 hashcpy(cmd->old_sha1, old_sha1);
 190                 hashcpy(cmd->new_sha1, new_sha1);
 191                 memcpy(cmd->ref_name, line + 82, len - 81);
 192                 cmd->error_string = "n/a (unpacker error)";
 193                 cmd->next = NULL;
 194                 *p = cmd;
 195                 p = &cmd->next;
 196         }
 197 }
 198
 199 static const char *unpack(int *error_code)
 200 {
 201         int code = run_command_v_opt(1, unpacker, RUN_GIT_CMD);
 202
 203         *error_code = 0;
 204         switch (code) {
 205         case 0:
 206                 return NULL;
 207         case -ERR_RUN_COMMAND_FORK:
 208                 return "unpack fork failed";
 209         case -ERR_RUN_COMMAND_EXEC:
 210                 return "unpack execute failed";
 211         case -ERR_RUN_COMMAND_WAITPID:
 212                 return "waitpid failed";
 213         case -ERR_RUN_COMMAND_WAITPID_WRONG_PID:
 214                 return "waitpid is confused";
 215         case -ERR_RUN_COMMAND_WAITPID_SIGNAL:
 216                 return "unpacker died of signal";
 217         case -ERR_RUN_COMMAND_WAITPID_NOEXIT:
 218                 return "unpacker died strangely";
 219         default:
 220                 *error_code = -code;
 221                 return "unpacker exited with error code";
 222         }
 223 }
 224
 225 static void report(const char *unpack_status)
 226 {
 227         struct command *cmd;
 228         packet_write(1, "unpack %s\n",
 229                      unpack_status ? unpack_status : "ok");
 230         for (cmd = commands; cmd; cmd = cmd->next) {
 231                 if (!cmd->error_string)
 232                         packet_write(1, "ok %s\n",
 233                                      cmd->ref_name);
 234                 else
 235                         packet_write(1, "ng %s %s\n",
 236                                      cmd->ref_name, cmd->error_string);
 237         }
 238         packet_flush(1);
 239 }
 240
 241 int main(int argc, char **argv)
 242 {
 243         int i;
 244         char *dir = NULL;
 245
 246         argv++;
 247         for (i = 1; i < argc; i++) {
 248                 char *arg = *argv++;
 249
 250                 if (*arg == '-') {
 251                         /* Do flag handling here */
 252                         usage(receive_pack_usage);
 253                 }
 254                 if (dir)
 255                         usage(receive_pack_usage);
 256                 dir = arg;
 257         }
 258         if (!dir)
 259                 usage(receive_pack_usage);
 260
 261         if (!enter_repo(dir, 0))
 262                 die("'%s': unable to chdir or not a git archive", dir);
 263
 264         setup_ident();
 265         git_config(git_default_config);
 266
 267         write_head_info();
 268
 269         /* EOF */
 270         packet_flush(1);
 271
 272         read_head_info();
 273         if (commands) {
 274                 int code;
 275                 const char *unpack_status = unpack(&code);
 276                 if (!unpack_status)
 277                         execute_commands();
 278                 if (report_status)
 279                         report(unpack_status);
 280         }
 281         return 0;
 282 }