2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009 Michael Stapelberg and contributors (see also: LICENSE)
7 * display_version.c: displays the running i3 version, runs as part of
13 #include <sys/types.h>
16 #include <sys/socket.h>
21 static bool human_readable_key, loaded_config_file_name_key;
22 static char *human_readable_version, *loaded_config_file_name;
24 static int version_string(void *ctx, const unsigned char *val, size_t len) {
25 if (human_readable_key)
26 sasprintf(&human_readable_version, "%.*s", (int)len, val);
27 if (loaded_config_file_name_key)
28 sasprintf(&loaded_config_file_name, "%.*s", (int)len, val);
32 static int version_map_key(void *ctx, const unsigned char *stringval, size_t stringlen) {
33 human_readable_key = (stringlen == strlen("human_readable") &&
34 strncmp((const char *)stringval, "human_readable", strlen("human_readable")) == 0);
35 loaded_config_file_name_key = (stringlen == strlen("loaded_config_file_name") &&
36 strncmp((const char *)stringval, "loaded_config_file_name", strlen("loaded_config_file_name")) == 0);
40 static yajl_callbacks version_callbacks = {
41 .yajl_string = version_string,
42 .yajl_map_key = version_map_key,
46 * Connects to i3 to find out the currently running version. Useful since it
47 * might be different from the version compiled into this binary (maybe the
48 * user didn’t correctly install i3 or forgot te restart it).
50 * The output looks like this:
51 * Running i3 version: 4.2-202-gb8e782c (2012-08-12, branch "next") (pid 14804)
53 * The i3 binary you just called: /home/michael/i3/i3
54 * The i3 binary you are running: /home/michael/i3/i3
57 void display_running_version(void) {
58 char *socket_path = root_atom_contents("I3_SOCKET_PATH", conn, conn_screen);
59 if (socket_path == NULL)
62 char *pid_from_atom = root_atom_contents("I3_PID", conn, conn_screen);
63 if (pid_from_atom == NULL) {
64 /* If I3_PID is not set, the running version is older than 4.2-200. */
65 printf("\nRunning version: < 4.2-200\n");
69 /* Inform the user of what we are doing. While a single IPC request is
70 * really fast normally, in case i3 hangs, this will not terminate. */
71 printf("(Getting version from running i3, press ctrl-c to abort…)");
74 /* TODO: refactor this with the code for sending commands */
75 int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);
77 err(EXIT_FAILURE, "Could not create socket");
79 struct sockaddr_un addr;
80 memset(&addr, 0, sizeof(struct sockaddr_un));
81 addr.sun_family = AF_LOCAL;
82 strncpy(addr.sun_path, socket_path, sizeof(addr.sun_path) - 1);
83 if (connect(sockfd, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un)) < 0)
84 err(EXIT_FAILURE, "Could not connect to i3");
86 if (ipc_send_message(sockfd, 0, I3_IPC_MESSAGE_TYPE_GET_VERSION,
88 err(EXIT_FAILURE, "IPC: write()");
90 uint32_t reply_length;
94 if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
96 err(EXIT_FAILURE, "IPC: read()");
100 if (reply_type != I3_IPC_MESSAGE_TYPE_GET_VERSION)
101 errx(EXIT_FAILURE, "Got reply type %d, but expected %d (GET_VERSION)", reply_type, I3_IPC_MESSAGE_TYPE_GET_VERSION);
103 yajl_handle handle = yajl_alloc(&version_callbacks, NULL, NULL);
105 yajl_status state = yajl_parse(handle, (const unsigned char *)reply, (int)reply_length);
106 if (state != yajl_status_ok)
107 errx(EXIT_FAILURE, "Could not parse my own reply. That's weird. reply is %.*s", (int)reply_length, reply);
109 printf("\rRunning i3 version: %s (pid %s)\n", human_readable_version, pid_from_atom);
111 if (loaded_config_file_name) {
115 printf("Loaded i3 config: %s", loaded_config_file_name);
116 if (stat(loaded_config_file_name, &sb) == -1) {
118 ELOG("Cannot stat config file \"%s\"\n", loaded_config_file_name);
120 strftime(mtime, sizeof(mtime), "%c", localtime(&(sb.st_mtime)));
122 printf(" (Last modified: %s, %.f seconds ago)\n", mtime, difftime(now, sb.st_mtime));
127 size_t destpath_size = 1024;
130 char *destpath = smalloc(destpath_size);
132 sasprintf(&exepath, "/proc/%d/exe", getpid());
134 while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
135 destpath_size = destpath_size * 2;
136 destpath = srealloc(destpath, destpath_size);
139 err(EXIT_FAILURE, "readlink(%s)", exepath);
141 /* readlink() does not NULL-terminate strings, so we have to. */
142 destpath[linksize] = '\0';
145 printf("The i3 binary you just called: %s\n", destpath);
148 sasprintf(&exepath, "/proc/%s/exe", pid_from_atom);
150 while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
151 destpath_size = destpath_size * 2;
152 destpath = srealloc(destpath, destpath_size);
155 err(EXIT_FAILURE, "readlink(%s)", exepath);
157 /* readlink() does not NULL-terminate strings, so we have to. */
158 destpath[linksize] = '\0';
160 /* Check if "(deleted)" is the readlink result. If so, the running version
161 * does not match the file on disk. */
162 if (strstr(destpath, "(deleted)") != NULL)
163 printf("RUNNING BINARY DIFFERENT FROM BINARY ON DISK!\n");
165 /* Since readlink() might put a "(deleted)" somewhere in the buffer and
166 * stripping that out seems hackish and ugly, we read the process’s argv[0]
169 sasprintf(&exepath, "/proc/%s/cmdline", pid_from_atom);
172 if ((fd = open(exepath, O_RDONLY)) == -1)
173 err(EXIT_FAILURE, "open(%s)", exepath);
174 if (read(fd, destpath, sizeof(destpath)) == -1)
175 err(EXIT_FAILURE, "read(%s)", exepath);
178 printf("The i3 binary you are running: %s\n", destpath);