lxc/0013-set-env-in-container.patch

From 01d666e795a2cce1d4968202a38c73e673c42e88 Mon Sep 17 00:00:00 2001
From: wujing <wujing50@huawei.com>
Date: Mon, 13 Apr 2020 07:04:20 -0400
Subject: [PATCH 13/49] set env in container

Signed-off-by: wujing <wujing50@huawei.com>
---
 src/lxc/attach.c          |  7 +++++++
 src/lxc/start.c           |  7 +++++++
 src/lxc/tools/lxc_start.c |  4 ++--
 src/lxc/utils.c           | 39 +++++++++++++++++++++++++++++++++++++++
 src/lxc/utils.h           |  2 ++
 5 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/src/lxc/attach.c b/src/lxc/attach.c
index 78b4700..801dc27 100644
--- a/src/lxc/attach.c
+++ b/src/lxc/attach.c
@@ -779,6 +779,13 @@ static int attach_child_main(struct attach_clone_payload *payload)
 	else
 		new_gid = ns_root_gid;
 
+#ifdef HAVE_ISULAD
+	// isulad: set env home in container
+	if (lxc_setup_env_home(new_uid) < 0) {
+		goto on_error;
+	}
+#endif
+
 	if ((init_ctx->container && init_ctx->container->lxc_conf &&
 	     init_ctx->container->lxc_conf->no_new_privs) ||
 	    (options->attach_flags & LXC_ATTACH_NO_NEW_PRIVS)) {
diff --git a/src/lxc/start.c b/src/lxc/start.c
index 70e8282..17766bc 100644
--- a/src/lxc/start.c
+++ b/src/lxc/start.c
@@ -1381,6 +1381,13 @@ static int do_start(void *data)
 	if (new_gid == nsgid)
 		new_gid = LXC_INVALID_GID;
 
+#ifdef HAVE_ISULAD
+	// isulad: set env home in container
+	if (lxc_setup_env_home(new_uid) < 0) {
+		goto out_warn_father;
+	}
+#endif
+
 	/* Make sure that the processes STDIO is correctly owned by the user that we are switching to */
 	ret = fix_stdio_permissions(new_uid);
 	if (ret)
diff --git a/src/lxc/tools/lxc_start.c b/src/lxc/tools/lxc_start.c
index 11ff15b..76802df6 100644
--- a/src/lxc/tools/lxc_start.c
+++ b/src/lxc/tools/lxc_start.c
@@ -139,7 +139,7 @@ static int my_parser(struct lxc_arguments *args, int c, char *arg)
 		break;
 	case OPT_STDERR_FIFO:
 		args->terminal_fifos[2] = arg;
-                break;
+		break;
 	case OPT_EXIT_FIFO:
 		args->exit_monitor_fifo = arg;
 		break;
@@ -328,7 +328,7 @@ int main(int argc, char *argv[])
 
 	if (my_args.terminal_fifos[0] || my_args.terminal_fifos[1] || my_args.terminal_fifos[2]) {
 		c->set_terminal_init_fifos(c, my_args.terminal_fifos[0], my_args.terminal_fifos[1], my_args.terminal_fifos[2]);
-        }
+	}
 
 	/* isulad: fifo used to monitor state of monitor process */
 	if (my_args.exit_monitor_fifo != NULL) {
diff --git a/src/lxc/utils.c b/src/lxc/utils.c
index 90113e0..5b04fa4 100644
--- a/src/lxc/utils.c
+++ b/src/lxc/utils.c
@@ -28,6 +28,7 @@
 #include <sys/wait.h>
 #include <unistd.h>
 #include <sys/sysmacros.h>
+#include <pwd.h>
 
 #include "config.h"
 #include "log.h"
@@ -2079,4 +2080,42 @@ out:
     free(pid_info);
     return startat;
 }
+
+// isulad: set env home in container
+int lxc_setup_env_home(uid_t uid)
+{
+#define __PASSWD_FILE__ "/etc/passwd"
+	char *homedir = "/"; // default home dir is /
+	FILE *stream = NULL;
+	struct passwd pw, *pwbufp = NULL;
+	char buf[BUFSIZ];
+
+	stream = fopen_cloexec(__PASSWD_FILE__, "r");
+	if (stream == NULL) {
+		SYSWARN("Failed to open %s", __PASSWD_FILE__);
+		goto set_env;
+	}
+
+	while (fgetpwent_r(stream, &pw, buf, sizeof(buf), &pwbufp) == 0 && pwbufp != NULL) {
+		if (pwbufp->pw_uid == uid) {
+			homedir = pwbufp->pw_dir;
+			goto set_env;
+		}
+	}
+	WARN("User invalid, can not find user '%u'", uid);
+
+set_env:
+	if (stream)
+		fclose(stream);
+
+	// if we didn't configure HOME, set it based on uid
+	if (setenv("HOME", homedir, 0) < 0) {
+		SYSERROR("Unable to set env 'HOME'");
+		return -1;
+	}
+
+	NOTICE("Setted env 'HOME' to %s", homedir);
+	return 0;
+}
+
 #endif
diff --git a/src/lxc/utils.h b/src/lxc/utils.h
index fbb0d55..677f632 100644
--- a/src/lxc/utils.h
+++ b/src/lxc/utils.h
@@ -316,6 +316,8 @@ extern int fix_stdio_permissions(uid_t uid);
 extern void lxc_write_error_message(int errfd, const char *format, ...);
 extern int lxc_file2str(const char *filename, char ret[], int cap);
 extern int unsigned long long lxc_get_process_startat(pid_t pid);
+// set env home in container
+extern int lxc_setup_env_home(uid_t uid);
 #endif
 
 #endif /* __LXC_UTILS_H */
-- 
1.8.3.1