| 110 | } |
| 111 | |
| 112 | static int handshake_version(struct child_process *process, |
| 113 | const char *welcome_prefix, int *versions, |
| 114 | int *chosen_version) |
| 115 | { |
| 116 | int version_scratch; |
| 117 | int i; |
| 118 | char *line; |
| 119 | const char *p; |
| 120 | |
| 121 | if (!chosen_version) |
| 122 | chosen_version = &version_scratch; |
| 123 | |
| 124 | if (packet_write_fmt_gently(process->in, "%s-client\n", |
| 125 | welcome_prefix)) |
| 126 | return error("Could not write client identification"); |
| 127 | for (i = 0; versions[i]; i++) { |
| 128 | if (packet_write_fmt_gently(process->in, "version=%d\n", |
| 129 | versions[i])) |
| 130 | return error("Could not write requested version"); |
| 131 | } |
| 132 | if (packet_flush_gently(process->in)) |
| 133 | return error("Could not write flush packet"); |
| 134 | |
| 135 | if (packet_read_line_gently(process->out, NULL, &line) < 0) |
| 136 | return error("could not read greeting from subprocess '%s'", |
| 137 | process->args.v[0]); |
| 138 | if (!line || !skip_prefix(line, welcome_prefix, &p) || |
| 139 | strcmp(p, "-server")) |
| 140 | return error("Unexpected line '%s', expected %s-server", |
| 141 | line ? line : "<flush packet>", welcome_prefix); |
| 142 | if (packet_read_line_gently(process->out, NULL, &line) < 0) |
| 143 | return error("could not read version from subprocess '%s'", |
| 144 | process->args.v[0]); |
| 145 | if (!line || !skip_prefix(line, "version=", &p) || |
| 146 | strtol_i(p, 10, chosen_version)) |
| 147 | return error("Unexpected line '%s', expected version", |
| 148 | line ? line : "<flush packet>"); |
| 149 | if (packet_read_line_gently(process->out, NULL, &line) < 0) |
| 150 | return error("could not read version flush from subprocess '%s'", |
| 151 | process->args.v[0]); |
| 152 | if (line) |
| 153 | return error("Unexpected line '%s', expected flush", line); |
| 154 | |
| 155 | /* Check to make sure that the version received is supported */ |
| 156 | for (i = 0; versions[i]; i++) { |
| 157 | if (versions[i] == *chosen_version) |
| 158 | break; |
| 159 | } |
| 160 | if (!versions[i]) |
| 161 | return error("Version %d not supported", *chosen_version); |
| 162 | |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | static int handshake_capabilities(struct child_process *process, |
| 167 | struct subprocess_capability *capabilities, |
no test coverage detected