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/*
* vim:ts=4:sw=4:expandtab
*
* i3 - an improved dynamic tiling window manager
* © 2009 Michael Stapelberg and contributors (see also: LICENSE)
*
* display_version.c: displays the running i3 version, runs as part of
* i3 --moreversion.
*
*/
#include "all.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <fcntl.h>
#include <time.h>
static bool human_readable_key, loaded_config_file_name_key;
static char *human_readable_version, *loaded_config_file_name;
static int version_string(void *ctx, const unsigned char *val, size_t len) {
if (human_readable_key)
sasprintf(&human_readable_version, "%.*s", (int)len, val);
if (loaded_config_file_name_key)
sasprintf(&loaded_config_file_name, "%.*s", (int)len, val);
return 1;
}
static int version_map_key(void *ctx, const unsigned char *stringval, size_t stringlen) {
human_readable_key = (stringlen == strlen("human_readable") &&
strncmp((const char *)stringval, "human_readable", strlen("human_readable")) == 0);
loaded_config_file_name_key = (stringlen == strlen("loaded_config_file_name") &&
strncmp((const char *)stringval, "loaded_config_file_name", strlen("loaded_config_file_name")) == 0);
return 1;
}
static yajl_callbacks version_callbacks = {
.yajl_string = version_string,
.yajl_map_key = version_map_key,
};
/*
* Connects to i3 to find out the currently running version. Useful since it
* might be different from the version compiled into this binary (maybe the
* user didn’t correctly install i3 or forgot te restart it).
*
* The output looks like this:
* Running i3 version: 4.2-202-gb8e782c (2012-08-12, branch "next") (pid 14804)
*
* The i3 binary you just called: /home/michael/i3/i3
* The i3 binary you are running: /home/michael/i3/i3
*
*/
void display_running_version(void) {
if (getenv("DISPLAY") == NULL) {
fprintf(stderr, "\nYour DISPLAY environment variable is not set.\n");
fprintf(stderr, "Are you running i3 via SSH or on a virtual console?\n");
fprintf(stderr, "Try DISPLAY=:0 i3 --moreversion\n");
exit(EXIT_FAILURE);
}
char *pid_from_atom = root_atom_contents("I3_PID", conn, conn_screen);
if (pid_from_atom == NULL) {
/* If I3_PID is not set, the running version is older than 4.2-200. */
printf("\nRunning version: < 4.2-200\n");
exit(EXIT_SUCCESS);
}
/* Inform the user of what we are doing. While a single IPC request is
* really fast normally, in case i3 hangs, this will not terminate. */
printf("(Getting version from running i3, press ctrl-c to abort…)");
fflush(stdout);
int sockfd = ipc_connect(NULL);
if (ipc_send_message(sockfd, 0, I3_IPC_MESSAGE_TYPE_GET_VERSION,
(uint8_t *)"") == -1)
err(EXIT_FAILURE, "IPC: write()");
uint32_t reply_length;
uint32_t reply_type;
uint8_t *reply;
int ret;
if ((ret = ipc_recv_message(sockfd, &reply_type, &reply_length, &reply)) != 0) {
if (ret == -1)
err(EXIT_FAILURE, "IPC: read()");
exit(EXIT_FAILURE);
}
if (reply_type != I3_IPC_MESSAGE_TYPE_GET_VERSION)
errx(EXIT_FAILURE, "Got reply type %d, but expected %d (GET_VERSION)", reply_type, I3_IPC_MESSAGE_TYPE_GET_VERSION);
yajl_handle handle = yajl_alloc(&version_callbacks, NULL, NULL);
yajl_status state = yajl_parse(handle, (const unsigned char *)reply, (int)reply_length);
if (state != yajl_status_ok)
errx(EXIT_FAILURE, "Could not parse my own reply. That's weird. reply is %.*s", (int)reply_length, reply);
printf("\rRunning i3 version: %s (pid %s)\n", human_readable_version, pid_from_atom);
if (loaded_config_file_name) {
struct stat sb;
time_t now;
char mtime[64];
printf("Loaded i3 config: %s", loaded_config_file_name);
if (stat(loaded_config_file_name, &sb) == -1) {
printf("\n");
ELOG("Cannot stat config file \"%s\"\n", loaded_config_file_name);
} else {
strftime(mtime, sizeof(mtime), "%c", localtime(&(sb.st_mtime)));
time(&now);
printf(" (Last modified: %s, %.f seconds ago)\n", mtime, difftime(now, sb.st_mtime));
}
}
#ifdef __linux__
size_t destpath_size = 1024;
ssize_t linksize;
char *exepath;
char *destpath = smalloc(destpath_size);
sasprintf(&exepath, "/proc/%d/exe", getpid());
while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
destpath_size = destpath_size * 2;
destpath = srealloc(destpath, destpath_size);
}
if (linksize == -1)
err(EXIT_FAILURE, "readlink(%s)", exepath);
/* readlink() does not NULL-terminate strings, so we have to. */
destpath[linksize] = '\0';
printf("\n");
printf("The i3 binary you just called: %s\n", destpath);
free(exepath);
sasprintf(&exepath, "/proc/%s/exe", pid_from_atom);
while ((linksize = readlink(exepath, destpath, destpath_size)) == (ssize_t)destpath_size) {
destpath_size = destpath_size * 2;
destpath = srealloc(destpath, destpath_size);
}
if (linksize == -1)
err(EXIT_FAILURE, "readlink(%s)", exepath);
/* readlink() does not NULL-terminate strings, so we have to. */
destpath[linksize] = '\0';
/* Check if "(deleted)" is the readlink result. If so, the running version
* does not match the file on disk. */
if (strstr(destpath, "(deleted)") != NULL)
printf("RUNNING BINARY DIFFERENT FROM BINARY ON DISK!\n");
/* Since readlink() might put a "(deleted)" somewhere in the buffer and
* stripping that out seems hackish and ugly, we read the process’s argv[0]
* instead. */
free(exepath);
sasprintf(&exepath, "/proc/%s/cmdline", pid_from_atom);
int fd;
if ((fd = open(exepath, O_RDONLY)) == -1)
err(EXIT_FAILURE, "open(%s)", exepath);
if (read(fd, destpath, sizeof(destpath)) == -1)
err(EXIT_FAILURE, "read(%s)", exepath);
close(fd);
printf("The i3 binary you are running: %s\n", destpath);
free(exepath);
free(destpath);
#endif
yajl_free(handle);
free(reply);
free(pid_from_atom);
}
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