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init: allow running the user-provided init as pid 1 (fix #223) #424

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Merged
merged 1 commit into from
Oct 21, 2025
Merged

init: allow running the user-provided init as pid 1 (fix #223) #424

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13 changes: 13 additions & 0 deletions init/init.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
Expand Down Expand Up @@ -1044,6 +1045,7 @@ int main(int argc, char **argv)
int sockfd;
int status;
int saved_errno;
bool init_pid1 = false;
char localhost[] = "localhost\0";
char *hostname;
char *krun_home;
Expand All @@ -1052,6 +1054,7 @@ int main(int argc, char **argv)
char *krun_root;
char *krun_root_fstype;
char *krun_root_options;
char *env_init_pid1;
char *config_workdir, *env_workdir;
char *rlimits;
char **config_argv, **exec_argv;
Expand Down Expand Up @@ -1186,12 +1189,21 @@ int main(int argc, char **argv)
exec_argv[0] = &DEFAULT_KRUN_INIT[0];
}

env_init_pid1 = getenv("KRUN_INIT_PID1");
if (env_init_pid1 && *env_init_pid1 == '1') {
init_pid1 = true;
}

#ifdef __TIMESYNC__
if (fork() == 0) {
clock_worker();
}
#endif

if (init_pid1) {
goto exec_init;
}

// We need to fork ourselves, because pid 1 cannot doesn't receive SIGINT
// signal
int child = fork();
Expand All @@ -1201,6 +1213,7 @@ int main(int argc, char **argv)
exit(125);
}
if (child == 0) { // child
exec_init:
if (setup_redirects() < 0) {
exit(125);
}
Expand Down
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