setup default PATH if it is not in the specified env list

for the issue hyperhq/hyperd#566

Signed-off-by: Wang Xu <gnawux@gmail.com>

Author: gnawux

src/exec.c

@@ -534,6 +534,7 @@ static int hyper_do_exec_cmd(struct hyper_exec *exec, int pipe, struct stdio_con
 // do the exec, no return
 static void hyper_exec_process(struct hyper_exec *exec, struct stdio_config *io)
 {
+	bool defaultPath = false;
 	if (sigprocmask(SIG_SETMASK, &orig_mask, NULL) < 0) {
 		perror("sigprocmask restore mask failed");
 		goto exit;
@@ -550,7 +551,8 @@ static void hyper_exec_process(struct hyper_exec *exec, struct stdio_config *io)
 	}
 
 	// set the process env
-	if (hyper_setup_env(exec->envs, exec->envs_num) < 0) {
+	defaultPath = (exec->argv[0][0] != '/') && (strcmp(exec->container_id, HYPERSTART_EXEC_CONTAINER) != 0);
+	if (hyper_setup_env(exec->envs, exec->envs_num, defaultPath) < 0) {
 		fprintf(stderr, "setup env failed\n");
 		goto exit;
 	}

src/util.c

@@ -30,16 +30,24 @@ char *read_cmdline(void)
 	return NULL;
 }
 
-int hyper_setup_env(struct env *envs, int num)
+int hyper_setup_env(struct env *envs, int num, bool setPATH)
 {
 	int i, ret = 0;
 	struct env *env;
+	if (setPATH) {
+		ret = setenv("PATH", "/usr/local/bin:/usr/bin:/bin:.", 1);
+		if (ret < 0) {
+			perror("fail to setup default PATH");
+			ret = -1;
+		}
+	}
 
 	for (i = 0; i < num; i++) {
 		env = &envs[i];
 		if (setenv(env->env, env->value, 1) < 0) {
 			perror("fail to setup env");
 			ret = -1;
+			continue;
 		}
 	}
 

src/util.h

@@ -18,7 +18,7 @@ struct env;
 #endif
 
 char *read_cmdline(void);
-int hyper_setup_env(struct env *envs, int num);
+int hyper_setup_env(struct env *envs, int num, bool setPATH);
 int hyper_find_sd(char *addr, char **dev);
 int hyper_list_dir(char *path);
 int hyper_copy_dir(char *src, char *dst);