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preinit: print errno (in hex, it's easier) for failures

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This commit is contained in:
Daniel Barlow
2023-11-04 23:58:33 +00:00
parent 6db982f25f
commit c3ccee6506
2 changed files with 48 additions and 10 deletions
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19
pkgs/preinit/preinit.c
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@@ -13,7 +13,9 @@
void parseopts(char * cmdline, char **root, char **rootfstype);
#define ERR(x) write(2, x, strlen(x))
#define AVER(c) do { if(c < 0) ERR("failed: " #c); } while(0)
#define AVER(c) do { if(c < 0) { ERR("failed: " #c ": error=0x" ); pr_u32(errno); ERR("\n"); } } while(0)
char * pr_u32(int32_t input);
static void die() {
/* if init exits, it causes a kernel panic. On the Turris
@@ -52,7 +54,7 @@ int main(int argc, char *argv[], char *envp[])
write(1, banner, strlen(banner));
mount("none", "/proc", "proc", 0, NULL);
AVER(mount("none", "/proc", "proc", 0, NULL));
int cmdline = open("/proc/cmdline", O_RDONLY, 0);
@@ -66,18 +68,19 @@ int main(int argc, char *argv[], char *envp[])
write(1, "cmdline: \"", 10);
write(1, buf, len);
write(1, "\"\n", 2);
};
} else {
ERR("failed: open(\"/proc/cmdline\")\n");
die();
}
parseopts(buf, &rootdevice, &rootfstype);
if(rootdevice) {
if(!rootfstype) rootfstype = "jffs2"; /* backward compatibility */
write(1, "rootdevice ", 11);
write(1, rootdevice, strlen(rootdevice));
write(1, " (", 2);
write(1, rootfstype, strlen(rootfstype));
write(1, ")\n", 1);
write(1, ")\n", 2);
AVER(mount(rootdevice, "/target/persist", rootfstype, 0, NULL));
AVER(mount("/target/persist/nix", "/target/nix",
"bind", MS_BIND, NULL));
@@ -87,7 +90,7 @@ int main(int argc, char *argv[], char *envp[])
AVER(chdir("/target"));
AVER(mount("/target", "/", "bind", MS_BIND | MS_REC, NULL));
AVER(chroot("."));
AVER(chroot("."));
argv[0] = "init";
argv[1] = NULL;