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fs.c
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fs.c
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/* SPDX-License-Identifier: LGPL-3.0-or-later */
/* Copyright (C) 2022 Intel Corporation
* Mariusz Zaborski <[email protected]>
*/
/*
* This file contains the implementation of `etc` passthrough.
*/
#include "libos_checkpoint.h"
#include "libos_fs.h"
#include "libos_fs_pseudo.h"
static int provide_etc_hostname(struct libos_dentry* dent, char** out_data, size_t* out_size) {
__UNUSED(dent);
/* Use the string (without null terminator) as file data */
size_t size = strlen(g_pal_public_state->hostname);
char* data = malloc(size);
if (!data)
return -ENOMEM;
memcpy(data, g_pal_public_state->hostname, size);
*out_data = data;
*out_size = size;
return 0;
}
int init_etc(void) {
pseudo_add_str(NULL, "hostname", &provide_etc_hostname);
return 0;
}
int init_mount_etc(void) {
int ret;
if (!g_pal_public_state->passthrough_etc_files)
return 0;
ret = mount_fs(&(struct libos_mount_params){
.type = "pseudo",
.path = "/etc/hostname",
.uri = "hostname",
});
if (ret < 0)
return ret;
return 0;
}
BEGIN_CP_FUNC(etc_info) {
__UNUSED(size);
__UNUSED(obj);
__UNUSED(objp);
/* Propagate hostname */
size_t off = ADD_CP_OFFSET(sizeof(g_pal_public_state->hostname) +
sizeof(g_pal_public_state->passthrough_etc_files));
char* new_hostname = (char*)(base + off);
memcpy(new_hostname, g_pal_public_state->hostname, sizeof(g_pal_public_state->hostname));
/* Propagate passthrough_etc_files */
bool* new_passthrough_etc_files = (bool*)(new_hostname +
sizeof(g_pal_public_state->hostname));
*new_passthrough_etc_files = g_pal_public_state->passthrough_etc_files;
ADD_CP_FUNC_ENTRY(off);
}
END_CP_FUNC(etc_info)
BEGIN_RS_FUNC(etc_info) {
__UNUSED(offset);
__UNUSED(rebase);
const char* hostname = (const char*)(base + GET_CP_FUNC_ENTRY());
memcpy(&g_pal_public_state->hostname, hostname, sizeof(g_pal_public_state->hostname));
g_pal_public_state->passthrough_etc_files = *(bool*)(hostname +
sizeof(g_pal_public_state->hostname));
}
END_RS_FUNC(etc_info)