init: add support for sysupgrades triggered from preinit

[project/procd.git] / initd / preinit.c

diff --git a/initd/preinit.c b/initd/preinit.c
index 729978ea2f2af790653baaee5ae788f05a88a177..dda6576555b04cdedcac75fc745faccaf15a736b 100644 (file)
--- a/initd/preinit.c
+++ b/initd/preinit.c
@@ -27,6 +27,7 @@
 
 #include "init.h"
 #include "../watchdog.h"
+#include "../sysupgrade.h"
 
 static struct uloop_process preinit_proc;
 static struct uloop_process plugd_proc;
@@ -48,24 +49,59 @@ check_dbglvl(void)
                debug = lvl;
 }
 
+static void
+check_sysupgrade(void)
+{
+       char *prefix = NULL, *path = NULL, *command = NULL;
+       size_t n;
+
+       if (chdir("/"))
+               return;
+
+       FILE *sysupgrade = fopen("/tmp/sysupgrade", "r");
+       if (!sysupgrade)
+               return;
+
+       n = 0;
+       if (getdelim(&prefix, &n, 0, sysupgrade) < 0)
+               goto fail;
+       n = 0;
+       if (getdelim(&path, &n, 0, sysupgrade) < 0)
+               goto fail;
+       n = 0;
+       if (getdelim(&command, &n, 0, sysupgrade) < 0)
+               goto fail;
+
+       fclose(sysupgrade);
+
+       sysupgrade_exec_upgraded(prefix, path, command);
+
+       while (true)
+               sleep(1);
+
+fail:
+       fclose(sysupgrade);
+       free(prefix);
+       free(path);
+       free(command);
+}
+
 static void
 spawn_procd(struct uloop_process *proc, int ret)
 {
        char *wdt_fd = watchdog_fd();
        char *argv[] = { "/sbin/procd", NULL};
-       struct stat s;
        char dbg[2];
 
        if (plugd_proc.pid > 0)
                kill(plugd_proc.pid, SIGKILL);
 
-       if (!stat("/tmp/sysupgrade", &s))
-               while (true)
-                       sleep(1);
-
        unsetenv("INITRAMFS");
        unsetenv("PREINIT");
        unlink("/tmp/.preinit");
+
+       check_sysupgrade();
+
        DEBUG(2, "Exec to real procd now\n");
        if (wdt_fd)
                setenv("WDTFD", wdt_fd, 1);