| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | |
| 3 | #include "git-compat-util.h" |
| 4 | #include "gettext.h" |
| 5 | #include "simple-ipc.h" |
| 6 | #include "fsmonitor-ipc.h" |
| 7 | #include "repository.h" |
| 8 | #include "run-command.h" |
| 9 | #include "strbuf.h" |
| 10 | #include "trace2.h" |
| 11 | |
| 12 | #ifndef HAVE_FSMONITOR_DAEMON_BACKEND |
| 13 | |
| 14 | /* |
| 15 | * A trivial implementation of the fsmonitor_ipc__ API for unsupported |
| 16 | * platforms. |
| 17 | */ |
| 18 | |
| 19 | int fsmonitor_ipc__is_supported(void) |
| 20 | { |
| 21 | return 0; |
| 22 | } |
| 23 | |
| 24 | const char *fsmonitor_ipc__get_path(struct repository *r UNUSED) |
| 25 | { |
| 26 | return NULL; |
| 27 | } |
| 28 | |
| 29 | enum ipc_active_state fsmonitor_ipc__get_state(void) |
| 30 | { |
| 31 | return IPC_STATE__OTHER_ERROR; |
| 32 | } |
| 33 | |
| 34 | int fsmonitor_ipc__send_query(const char *since_token UNUSED, |
| 35 | struct strbuf *answer UNUSED) |
| 36 | { |
| 37 | return -1; |
| 38 | } |
| 39 | |
| 40 | int fsmonitor_ipc__send_command(const char *command UNUSED, |
| 41 | struct strbuf *answer UNUSED) |
| 42 | { |
| 43 | return -1; |
| 44 | } |
| 45 | |
| 46 | #else |
| 47 | |
| 48 | int fsmonitor_ipc__is_supported(void) |
| 49 | { |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | enum ipc_active_state fsmonitor_ipc__get_state(void) |
| 54 | { |
| 55 | return ipc_get_active_state(fsmonitor_ipc__get_path(the_repository)); |
| 56 | } |
| 57 | |
| 58 | static int spawn_daemon(void) |
| 59 | { |
| 60 | struct child_process cmd = CHILD_PROCESS_INIT; |
| 61 | |
| 62 | cmd.git_cmd = 1; |
| 63 | cmd.no_stdin = 1; |
| 64 | cmd.no_stdout = 1; |
| 65 | cmd.no_stderr = 1; |
| 66 | cmd.close_fd_above_stderr = 1; |
| 67 | cmd.trace2_child_class = "fsmonitor"; |
| 68 | strvec_pushl(&cmd.args, "fsmonitor--daemon", "start", NULL); |
| 69 | |
| 70 | return run_command(&cmd); |
| 71 | } |
| 72 | |
| 73 | int fsmonitor_ipc__send_query(const char *since_token, |
| 74 | struct strbuf *answer) |
| 75 | { |
| 76 | int ret = -1; |
| 77 | int tried_to_spawn = 0; |
| 78 | enum ipc_active_state state = IPC_STATE__OTHER_ERROR; |
| 79 | struct ipc_client_connection *connection = NULL; |
| 80 | struct ipc_client_connect_options options |
| 81 | = IPC_CLIENT_CONNECT_OPTIONS_INIT; |
| 82 | const char *tok = since_token ? since_token : ""; |
| 83 | size_t tok_len = since_token ? strlen(since_token) : 0; |
| 84 | |
| 85 | options.wait_if_busy = 1; |
| 86 | options.wait_if_not_found = 0; |
| 87 | |
| 88 | trace2_region_enter("fsm_client", "query", NULL); |
| 89 | trace2_data_string("fsm_client", NULL, "query/command", tok); |
| 90 | |
| 91 | try_again: |
| 92 | state = ipc_client_try_connect(fsmonitor_ipc__get_path(the_repository), |
| 93 | &options, &connection); |
| 94 | |
| 95 | switch (state) { |
| 96 | case IPC_STATE__LISTENING: |
| 97 | ret = ipc_client_send_command_to_connection( |
| 98 | connection, tok, tok_len, answer); |
| 99 | ipc_client_close_connection(connection); |
| 100 | |
| 101 | trace2_data_intmax("fsm_client", NULL, |
| 102 | "query/response-length", answer->len); |
| 103 | goto done; |
| 104 | |
| 105 | case IPC_STATE__NOT_LISTENING: |
| 106 | case IPC_STATE__PATH_NOT_FOUND: |
| 107 | if (tried_to_spawn) |
| 108 | goto done; |
| 109 | |
| 110 | tried_to_spawn++; |
| 111 | if (spawn_daemon()) |
| 112 | goto done; |
| 113 | |
| 114 | /* |
| 115 | * Try again, but this time give the daemon a chance to |
| 116 | * actually create the pipe/socket. |
| 117 | * |
| 118 | * Granted, the daemon just started so it can't possibly have |
| 119 | * any FS cached yet, so we'll always get a trivial answer. |
| 120 | * BUT the answer should include a new token that can serve |
| 121 | * as the basis for subsequent requests. |
| 122 | */ |
| 123 | options.wait_if_not_found = 1; |
| 124 | goto try_again; |
| 125 | |
| 126 | case IPC_STATE__INVALID_PATH: |
| 127 | ret = error(_("fsmonitor_ipc__send_query: invalid path '%s'"), |
| 128 | fsmonitor_ipc__get_path(the_repository)); |
| 129 | goto done; |
| 130 | |
| 131 | case IPC_STATE__OTHER_ERROR: |
| 132 | default: |
| 133 | ret = error(_("fsmonitor_ipc__send_query: unspecified error on '%s'"), |
| 134 | fsmonitor_ipc__get_path(the_repository)); |
| 135 | goto done; |
| 136 | } |
| 137 | |
| 138 | done: |
| 139 | trace2_region_leave("fsm_client", "query", NULL); |
| 140 | |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | int fsmonitor_ipc__send_command(const char *command, |
| 145 | struct strbuf *answer) |
| 146 | { |
| 147 | struct ipc_client_connection *connection = NULL; |
| 148 | struct ipc_client_connect_options options |
| 149 | = IPC_CLIENT_CONNECT_OPTIONS_INIT; |
| 150 | int ret; |
| 151 | enum ipc_active_state state; |
| 152 | const char *c = command ? command : ""; |
| 153 | size_t c_len = command ? strlen(command) : 0; |
| 154 | |
| 155 | strbuf_reset(answer); |
| 156 | |
| 157 | options.wait_if_busy = 1; |
| 158 | options.wait_if_not_found = 0; |
| 159 | |
| 160 | state = ipc_client_try_connect(fsmonitor_ipc__get_path(the_repository), |
| 161 | &options, &connection); |
| 162 | if (state != IPC_STATE__LISTENING) { |
| 163 | die(_("fsmonitor--daemon is not running")); |
| 164 | return -1; |
| 165 | } |
| 166 | |
| 167 | ret = ipc_client_send_command_to_connection(connection, c, c_len, |
| 168 | answer); |
| 169 | ipc_client_close_connection(connection); |
| 170 | |
| 171 | if (ret == -1) { |
| 172 | die(_("could not send '%s' command to fsmonitor--daemon"), c); |
| 173 | return -1; |
| 174 | } |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | #endif |