tools: basic init

tools/init/main.c

@@ -1,6 +1,38 @@
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <pwd.h>
 
 int main() {
-	printf("Hello, world!\n");
-	return 0;
+	printf("init: Welcome to Astral!\n");
+
+	struct passwd* pw = getpwuid(getuid());
+	//setenv("PWD", pw->pw_dir, 1);
+	setenv("HOME", pw->pw_dir, 1);
+	//chdir(pw->pw_dir);
+	setenv("PATH", "/bin:/usr/bin:/usr/local/bin:/sbin:/usr/sbin:/usr/local/sbin", 1);
+	setenv("TERM", "linux", 1);
+
+	printf("init: running /usr/bin/bash\n");
+
+	pid_t pid = fork();
+	if (pid == -1) {
+		perror("init: fork failed:");
+		return EXIT_FAILURE;
+	}
+
+	if (pid == 0) {
+		execl("/usr/bin/bash", "/usr/bin/bash", "-l", NULL);
+		perror("init: execl /usr/bin/bash failed:");
+		return EXIT_FAILURE;
+	}
+
+	for (;;) {
+		int status;
+		if (waitpid(-1, &status, 0) == -1) {
+			perror("init: waitpid failed:");
+			return EXIT_FAILURE;
+		}
+	}
 }