deploy: --dev hot-reloads the daemon via docker cp + SIGHUPv0.1.14

- bokfd re-execs its own binary on SIGHUP, closing listeners/db first
- scripts/deploy.sh --dev cross-builds and copies binaries into the
  running container, then verifies the reported version

1 files changed, 18 insertions, 2 deletions

diff --git a/src/bokfd.c b/src/bokfd.c
index 944e910..933b274 100644
--- a/src/bokfd.c
+++ b/src/bokfd.c
@@ -38,6 +38,7 @@ struct conn {
 };
 
 static volatile sig_atomic_t g_stop = 0;
+static volatile sig_atomic_t g_reload = 0;
 static size_t g_line_limit = 1024 * 1024;
 static SSL_CTX *g_tls_ctx = NULL;
 static time_t g_tls_cert_mtime = 0;
@@ -50,6 +51,12 @@ static void on_signal(int sig)
     g_stop = 1;
 }
 
+static void on_reload(int sig)
+{
+    (void)sig;
+    g_reload = 1;
+}
+
 static int mkdir_p(const char *path, mode_t mode)
 {
     char tmp[4096];
@@ -582,6 +589,7 @@ int main(int argc, char **argv)
 
     signal(SIGINT, on_signal);
     signal(SIGTERM, on_signal);
+    signal(SIGHUP, on_reload);
     signal(SIGPIPE, SIG_IGN);
     sessions_init(g_cfg.session_ttl);
 
@@ -599,7 +607,7 @@ int main(int argc, char **argv)
     int lfds[3];
     int ltls[3];
 
-    while (!g_stop) {
+    while (!g_stop && !g_reload) {
         int n = 0;
         int nlisteners = 0;
         lfds[nlisteners] = lfd;
@@ -670,7 +678,10 @@ int main(int argc, char **argv)
         nconns = keep;
     }
 
-    log_info("shutting down");
+    if (g_reload)
+        log_info("reloading on SIGHUP");
+    else
+        log_info("shutting down");
     for (size_t i = 0; i < nconns; i++) {
         if (conns[i].ssl)
             SSL_free(conns[i].ssl);
@@ -691,5 +702,10 @@ int main(int argc, char **argv)
     sessions_free_all();
     sqlite3_close(db);
     config_free();
+    if (g_reload) {
+        execv(argv[0], argv);
+        log_error("re-exec %s failed: %s", argv[0], strerror(errno));
+        return 1;
+    }
     return 0;
 }