Fix cookbook redoxer stage root selection

local/patches/relibc/P3-fd-event-tests.patch

@@ -0,0 +1,94 @@
+diff --git a/tests/sys_eventfd/eventfd.c b/tests/sys_eventfd/eventfd.c
+new file mode 100644
+--- /dev/null
++++ b/tests/sys_eventfd/eventfd.c
+@@ -0,0 +1,27 @@
++#include <assert.h>
++#include <stdint.h>
++#include <stdio.h>
++#include <sys/eventfd.h>
++#include <unistd.h>
++
++int main(void) {
++    int fd = eventfd(2, 0);
++    assert(fd >= 0);
++    eventfd_t value = 0;
++    assert(eventfd_read(fd, &value) == 0);
++    assert(value == 2);
++    assert(eventfd_write(fd, 5) == 0);
++    assert(eventfd_read(fd, &value) == 0);
++    assert(value == 5);
++    assert(close(fd) == 0);
++
++    int semfd = eventfd(2, EFD_SEMAPHORE);
++    assert(semfd >= 0);
++    assert(eventfd_read(semfd, &value) == 0);
++    assert(value == 1);
++    assert(eventfd_read(semfd, &value) == 0);
++    assert(value == 1);
++    assert(close(semfd) == 0);
++    puts("eventfd ok");
++    return 0;
++}
+diff --git a/tests/sys_signalfd/signalfd.c b/tests/sys_signalfd/signalfd.c
+new file mode 100644
+--- /dev/null
++++ b/tests/sys_signalfd/signalfd.c
+@@ -0,0 +1,22 @@
++#include <assert.h>
++#include <signal.h>
++#include <stdio.h>
++#include <stdint.h>
++#include <sys/signalfd.h>
++#include <unistd.h>
++
++int main(void) {
++    sigset_t mask;
++    assert(sigemptyset(&mask) == 0);
++    assert(sigaddset(&mask, SIGUSR1) == 0);
++    assert(sigprocmask(SIG_BLOCK, &mask, NULL) == 0);
++    int fd = signalfd(-1, &mask, sizeof(mask));
++    assert(fd >= 0);
++    assert(kill(getpid(), SIGUSR1) == 0);
++    struct signalfd_siginfo info;
++    assert(read(fd, &info, sizeof(info)) == (ssize_t)sizeof(info));
++    assert(info.ssi_signo == SIGUSR1);
++    assert(info.ssi_pid == (uint32_t)getpid());
++    assert(close(fd) == 0);
++    puts("signalfd ok");
++    return 0;
++}
+diff --git a/tests/sys_timerfd/timerfd.c b/tests/sys_timerfd/timerfd.c
+new file mode 100644
+--- /dev/null
++++ b/tests/sys_timerfd/timerfd.c
+@@ -0,0 +1,27 @@
++#include <assert.h>
++#include <stdint.h>
++#include <stdio.h>
++#include <string.h>
++#include <sys/timerfd.h>
++#include <unistd.h>
++
++int main(void) {
++    int fd = timerfd_create(CLOCK_REALTIME, 0);
++    assert(fd >= 0);
++    struct itimerspec spec;
++    memset(&spec, 0, sizeof(spec));
++    spec.it_value.tv_nsec = 1000000;
++    assert(timerfd_settime(fd, 0, &spec, NULL) == 0);
++
++    uint64_t expirations = 0;
++    assert(read(fd, &expirations, sizeof(expirations)) == (ssize_t)sizeof(expirations));
++    assert(expirations >= 1);
++
++    struct itimerspec cur;
++    assert(timerfd_gettime(fd, &cur) == 0);
++
++    memset(&spec, 0, sizeof(spec));
++    spec.it_value.tv_sec = 1;
++    assert(timerfd_settime(fd, TFD_TIMER_ABSTIME | TFD_TIMER_CANCEL_ON_SET, &spec, NULL) == 0);
++    assert(close(fd) == 0);
++    puts("timerfd ok");
++    return 0;
++}

src/bin/cookbook_redoxer.rs

@@ -1,4 +1,5 @@
 use std::env;
+use std::path::Path;
 
 fn main() {
     let mut args: Vec<String> = env::args().collect();
@@ -7,10 +8,15 @@ fn main() {
         args.insert(2, "--".to_string());
         if args[1] == "write-exec" {
             if let Ok(stage_dir) = std::env::var("COOKBOOK_STAGE") {
-                args.insert(2, format!("{}/root", stage_dir));
+                let folder = format!("{stage_dir}/root");
-                args.insert(2, "--folder".to_string());
+
                 args.insert(2, stage_dir);
                 args.insert(2, "--root".to_string());
+
+                if Path::new(&folder).exists() {
+                    args.insert(2, folder);
+                    args.insert(2, "--folder".to_string());
+                }
             }
         }
     }