chiark / gitweb /
getty-generator: fix stripping /dev/
[elogind.git] / src / getty-generator / getty-generator.c
index bb7c225..aeb6d71 100644 (file)
 #include "mkdir.h"
 #include "unit-name.h"
 #include "virt.h"
+#include "fileio.h"
+#include "path-util.h"
 
 static const char *arg_dest = "/tmp";
 
 static int add_symlink(const char *fservice, const char *tservice) {
-        char *from = NULL, *to = NULL;
+        _cleanup_free_ char *from = NULL, *to = NULL;
         int r;
 
         assert(fservice);
         assert(tservice);
 
         from = strappend(SYSTEM_DATA_UNIT_PATH "/", fservice);
-        to = join(arg_dest,"/getty.target.wants/", tservice, NULL);
+        if (!from)
+                return log_oom();
 
-        if (!from || !to) {
-                log_error("Out of memory");
-                r = -ENOMEM;
-                goto finish;
-        }
+        to = strjoin(arg_dest,"/getty.target.wants/", tservice, NULL);
+        if (!to)
+                return log_oom();
 
         mkdir_parents_label(to, 0755);
 
@@ -53,39 +54,42 @@ static int add_symlink(const char *fservice, const char *tservice) {
         if (r < 0) {
                 if (errno == EEXIST)
                         /* In case console=hvc0 is passed this will very likely result in EEXIST */
-                        r = 0;
+                        return 0;
                 else {
-                        log_error("Failed to create symlink from %s to %s: %m", from, to);
-                        r = -errno;
+                        log_error("Failed to create symlink %s: %m", to);
+                        return -errno;
                 }
         }
 
-finish:
-
-        free(from);
-        free(to);
-
-        return r;
+        return 0;
 }
 
 static int add_serial_getty(const char *tty) {
-        char *n;
-        int r;
+        _cleanup_free_ char *n = NULL;
 
         assert(tty);
 
         log_debug("Automatically adding serial getty for /dev/%s.", tty);
 
         n = unit_name_replace_instance("serial-getty@.service", tty);
-        if (!n) {
-                log_error("Out of memory");
-                return -ENOMEM;
-        }
+        if (!n)
+                return log_oom();
+
+        return add_symlink("serial-getty@.service", n);
+}
 
-        r = add_symlink("serial-getty@.service", n);
-        free(n);
+static int add_container_getty(const char *tty) {
+        _cleanup_free_ char *n = NULL;
 
-        return r;
+        assert(tty);
+
+        log_debug("Automatically adding container getty for /dev/pts/%s.", tty);
+
+        n = unit_name_replace_instance("container-getty@.service", tty);
+        if (!n)
+                return log_oom();
+
+        return add_symlink("container-getty@.service", n);
 }
 
 int main(int argc, char *argv[]) {
@@ -95,9 +99,9 @@ int main(int argc, char *argv[]) {
                 "xvc0\0"
                 "hvsi0\0";
 
-        int r = EXIT_SUCCESS;
-        char *active;
+        _cleanup_free_ char *active = NULL;
         const char *j;
+        int r;
 
         if (argc > 1 && argc != 4) {
                 log_error("This program takes three or no arguments.");
@@ -114,70 +118,92 @@ int main(int argc, char *argv[]) {
         umask(0022);
 
         if (detect_container(NULL) > 0) {
+                _cleanup_free_ char *container_ttys = NULL;
+
                 log_debug("Automatically adding console shell.");
 
                 if (add_symlink("console-getty.service", "console-getty.service") < 0)
-                        r = EXIT_FAILURE;
+                        return EXIT_FAILURE;
+
+                /* When $container_ttys is set for PID 1, spawn
+                 * gettys on all ptys named therein. Note that despite
+                 * the variable name we only support ptys here. */
+
+                r = getenv_for_pid(1, "container_ttys", &container_ttys);
+                if (r > 0) {
+                        char *w, *state;
+                        size_t l;
+
+                        FOREACH_WORD(w, l, container_ttys, state) {
+                                const char *t;
+                                char tty[l + 1];
+
+                                memcpy(tty, w, l);
+                                tty[l] = 0;
+
+                                /* First strip off /dev/ if it is specified */
+                                t = path_startswith(tty, "/dev/");
+                                if (!t)
+                                        t = tty;
+
+                                /* Then, make sure it's actually a pty */
+                                t = path_startswith(t, "pts/");
+                                if (!t)
+                                        continue;
+
+                                if (add_container_getty(t) < 0)
+                                        return EXIT_FAILURE;
+                        }
+                }
 
                 /* Don't add any further magic if we are in a container */
-                goto finish;
+                return EXIT_SUCCESS;
         }
 
         if (read_one_line_file("/sys/class/tty/console/active", &active) >= 0) {
-                const char *tty;
-
-                tty = strrchr(active, ' ');
-                if (tty)
-                        tty ++;
-                else
-                        tty = active;
-
-                /* Automatically add in a serial getty on the kernel
-                 * console */
-                if (tty_is_vc(tty))
-                        free(active);
-                else {
-                        int k;
+                char *w, *state;
+                size_t l;
+
+                /* Automatically add in a serial getty on all active
+                 * kernel consoles */
+                FOREACH_WORD(w, l, active, state) {
+                        _cleanup_free_ char *tty = NULL;
+
+                        tty = strndup(w, l);
+                        if (!tty) {
+                                log_oom();
+                                return EXIT_FAILURE;
+                        }
+
+                        if (isempty(tty) || tty_is_vc(tty))
+                                continue;
 
                         /* We assume that gettys on virtual terminals are
                          * started via manual configuration and do this magic
                          * only for non-VC terminals. */
 
-                        k = add_serial_getty(tty);
-                        free(active);
-
-                        if (k < 0) {
-                                r = EXIT_FAILURE;
-                                goto finish;
-                        }
+                        if (add_serial_getty(tty) < 0)
+                                return EXIT_FAILURE;
                 }
         }
 
         /* Automatically add in a serial getty on the first
          * virtualizer console */
         NULSTR_FOREACH(j, virtualization_consoles) {
-                char *p;
-                int k;
+                _cleanup_free_ char *p = NULL;
 
-                if (asprintf(&p, "/sys/class/tty/%s", j) < 0) {
-                        log_error("Out of memory");
-                        r = EXIT_FAILURE;
-                        goto finish;
+                p = strappend("/sys/class/tty/", j);
+                if (!p) {
+                        log_oom();
+                        return EXIT_FAILURE;
                 }
 
-                k = access(p, F_OK);
-                free(p);
-
-                if (k < 0)
+                if (access(p, F_OK) < 0)
                         continue;
 
-                k = add_serial_getty(j);
-                if (k < 0) {
-                        r = EXIT_FAILURE;
-                        goto finish;
-                }
+                if (add_serial_getty(j) < 0)
+                        return EXIT_FAILURE;
         }
 
-finish:
-        return r;
+        return EXIT_SUCCESS;
 }