Andrew's git - gitweb.git/blob - builtin/upload-archive.c

   1/*
   2 * Copyright (c) 2006 Franck Bui-Huu
   3 */
   4#include "cache.h"
   5#include "builtin.h"
   6#include "archive.h"
   7#include "pkt-line.h"
   8#include "sideband.h"
   9#include "run-command.h"
  10#include "argv-array.h"
  11
  12static const char upload_archive_usage[] =
  13        "git upload-archive <repo>";
  14
  15static const char deadchild[] =
  16"git upload-archive: archiver died with error";
  17
  18#define MAX_ARGS (64)
  19
  20int cmd_upload_archive_writer(int argc, const char **argv, const char *prefix)
  21{
  22        struct argv_array sent_argv = ARGV_ARRAY_INIT;
  23        const char *arg_cmd = "argument ";
  24
  25        if (argc != 2)
  26                usage(upload_archive_usage);
  27
  28        if (!enter_repo(argv[1], 0))
  29                die("'%s' does not appear to be a git repository", argv[1]);
  30
  31        /* put received options in sent_argv[] */
  32        argv_array_push(&sent_argv, "git-upload-archive");
  33        for (;;) {
  34                char *buf = packet_read_line(0, NULL);
  35                if (!buf)
  36                        break;  /* got a flush */
  37                if (sent_argv.argc > MAX_ARGS)
  38                        die("Too many options (>%d)", MAX_ARGS - 1);
  39
  40                if (!starts_with(buf, arg_cmd))
  41                        die("'argument' token or flush expected");
  42                argv_array_push(&sent_argv, buf + strlen(arg_cmd));
  43        }
  44
  45        /* parse all options sent by the client */
  46        return write_archive(sent_argv.argc, sent_argv.argv, prefix, 0, NULL, 1);
  47}
  48
  49__attribute__((format (printf, 1, 2)))
  50static void error_clnt(const char *fmt, ...)
  51{
  52        struct strbuf buf = STRBUF_INIT;
  53        va_list params;
  54
  55        va_start(params, fmt);
  56        strbuf_vaddf(&buf, fmt, params);
  57        va_end(params);
  58        send_sideband(1, 3, buf.buf, buf.len, LARGE_PACKET_MAX);
  59        die("sent error to the client: %s", buf.buf);
  60}
  61
  62static ssize_t process_input(int child_fd, int band)
  63{
  64        char buf[16384];
  65        ssize_t sz = read(child_fd, buf, sizeof(buf));
  66        if (sz < 0) {
  67                if (errno != EAGAIN && errno != EINTR)
  68                        error_clnt("read error: %s\n", strerror(errno));
  69                return sz;
  70        }
  71        send_sideband(1, band, buf, sz, LARGE_PACKET_MAX);
  72        return sz;
  73}
  74
  75int cmd_upload_archive(int argc, const char **argv, const char *prefix)
  76{
  77        struct child_process writer = { argv };
  78
  79        /*
  80         * Set up sideband subprocess.
  81         *
  82         * We (parent) monitor and read from child, sending its fd#1 and fd#2
  83         * multiplexed out to our fd#1.  If the child dies, we tell the other
  84         * end over channel #3.
  85         */
  86        argv[0] = "upload-archive--writer";
  87        writer.out = writer.err = -1;
  88        writer.git_cmd = 1;
  89        if (start_command(&writer)) {
  90                int err = errno;
  91                packet_write(1, "NACK unable to spawn subprocess\n");
  92                die("upload-archive: %s", strerror(err));
  93        }
  94
  95        packet_write(1, "ACK\n");
  96        packet_flush(1);
  97
  98        while (1) {
  99                struct pollfd pfd[2];
 100
 101                pfd[0].fd = writer.out;
 102                pfd[0].events = POLLIN;
 103                pfd[1].fd = writer.err;
 104                pfd[1].events = POLLIN;
 105                if (poll(pfd, 2, -1) < 0) {
 106                        if (errno != EINTR) {
 107                                error("poll failed resuming: %s",
 108                                      strerror(errno));
 109                                sleep(1);
 110                        }
 111                        continue;
 112                }
 113                if (pfd[1].revents & POLLIN)
 114                        /* Status stream ready */
 115                        if (process_input(pfd[1].fd, 2))
 116                                continue;
 117                if (pfd[0].revents & POLLIN)
 118                        /* Data stream ready */
 119                        if (process_input(pfd[0].fd, 1))
 120                                continue;
 121
 122                if (finish_command(&writer))
 123                        error_clnt("%s", deadchild);
 124                packet_flush(1);
 125                break;
 126        }
 127        return 0;
 128}