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 if (getenv("DISPLAY") == NULL) {
59 fprintf(stderr, "\nYour DISPLAY environment variable is not set.\n");
60 fprintf(stderr, "Are you running i3 via SSH or on a virtual console?\n");
61 fprintf(stderr, "Try DISPLAY=:0 i3 --moreversion\n");
65 char *pid_from_atom = root_atom_contents("I3_PID", conn, conn_screen);
66 if (pid_from_atom == NULL) {
67 /* If I3_PID is not set, the running version is older than 4.2-200. */
68 printf("\nRunning version: < 4.2-200\n");
72 /* Inform the user of what we are doing. While a single IPC request is
73 * really fast normally, in case i3 hangs, this will not terminate. */
74 printf("(Getting version from running i3, press ctrl-c to abort…)");
77 int sockfd = ipc_connect(NULL);
78 if (ipc_send_message(sockfd, 0, I3_IPC_MESSAGE_TYPE_GET_VERSION,
80 err(EXIT_FAILURE, "IPC: write()");
82 uint32_t reply_length;
86 if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
88 err(EXIT_FAILURE, "IPC: read()");
92 if (reply_type != I3_IPC_MESSAGE_TYPE_GET_VERSION)
93 errx(EXIT_FAILURE, "Got reply type %d, but expected %d (GET_VERSION)", reply_type, I3_IPC_MESSAGE_TYPE_GET_VERSION);
95 yajl_handle handle = yajl_alloc(&version_callbacks, NULL, NULL);
97 yajl_status state = yajl_parse(handle, (const unsigned char *)reply, (int)reply_length);
98 if (state != yajl_status_ok)
99 errx(EXIT_FAILURE, "Could not parse my own reply. That's weird. reply is %.*s", (int)reply_length, reply);
101 printf("\rRunning i3 version: %s (pid %s)\n", human_readable_version, pid_from_atom);
103 if (loaded_config_file_name) {
107 printf("Loaded i3 config: %s", loaded_config_file_name);
108 if (stat(loaded_config_file_name, &sb) == -1) {
110 ELOG("Cannot stat config file \"%s\"\n", loaded_config_file_name);
112 strftime(mtime, sizeof(mtime), "%c", localtime(&(sb.st_mtime)));
114 printf(" (Last modified: %s, %.f seconds ago)\n", mtime, difftime(now, sb.st_mtime));
119 size_t destpath_size = 1024;
122 char *destpath = smalloc(destpath_size);
124 sasprintf(&exepath, "/proc/%d/exe", getpid());
126 while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
127 destpath_size = destpath_size * 2;
128 destpath = srealloc(destpath, destpath_size);
131 err(EXIT_FAILURE, "readlink(%s)", exepath);
133 /* readlink() does not NULL-terminate strings, so we have to. */
134 destpath[linksize] = '\0';
137 printf("The i3 binary you just called: %s\n", destpath);
140 sasprintf(&exepath, "/proc/%s/exe", pid_from_atom);
142 while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
143 destpath_size = destpath_size * 2;
144 destpath = srealloc(destpath, destpath_size);
147 err(EXIT_FAILURE, "readlink(%s)", exepath);
149 /* readlink() does not NULL-terminate strings, so we have to. */
150 destpath[linksize] = '\0';
152 /* Check if "(deleted)" is the readlink result. If so, the running version
153 * does not match the file on disk. */
154 if (strstr(destpath, "(deleted)") != NULL)
155 printf("RUNNING BINARY DIFFERENT FROM BINARY ON DISK!\n");
157 /* Since readlink() might put a "(deleted)" somewhere in the buffer and
158 * stripping that out seems hackish and ugly, we read the process’s argv[0]
161 sasprintf(&exepath, "/proc/%s/cmdline", pid_from_atom);
164 if ((fd = open(exepath, O_RDONLY)) == -1)
165 err(EXIT_FAILURE, "open(%s)", exepath);
166 if (read(fd, destpath, sizeof(destpath)) == -1)
167 err(EXIT_FAILURE, "read(%s)", exepath);
170 printf("The i3 binary you are running: %s\n", destpath);