add tool to creat an init ram disk
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28
tools/Makefile
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28
tools/Makefile
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MAKE = make
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CC = gcc
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CFLAGS = -O2 -Wall #-m32
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LDFLGAS =
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FILE = ../README.md
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# other implicit rules
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%.o : %.c
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$(CC) -c $(CFLAGS) -o $@ $<
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default: all
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all: make_initrd initrd.img
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initrd.img: $(EXECFILES) make_initrd
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./make_initrd /tmp $(FILE) $(shell basename $(FILE))
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make_initrd: make_initrd.o
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$(CC) $(CFLAGS) -o $@ $< $(LDFLAGS)
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clean:
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$(RM) -rf *.o *~ make_initrd initrd.img
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depend:
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$(CC) -MM $(CFLAGS) *.c > Makefile.dep
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-include Makefile.dep
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# DO NOT DELETE
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134
tools/make_initrd.c
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tools/make_initrd.c
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/*
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* Copyright (c) 2010, Stefan Lankes, RWTH Aachen University
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#define INITRD_MAGIC_NUMBER 0x4711
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#define MAX_FNAME 128
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#define PAGE_SIZE 4096
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typedef struct {
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uint32_t magic;
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uint32_t nfiles;
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char mount_point[MAX_FNAME];
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} initrd_header_t;
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typedef struct {
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uint32_t length;
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uint32_t offset;
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char fname[MAX_FNAME];
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} initrd_file_desc_t;
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static void print_options(void)
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{
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printf(" make_initrd mount_point path name [path name]\n");
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printf("\n");
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printf(" mount_point - mount point of init ram disk, where all file will be mounted.\n");
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printf(" path - path to the file, which will be mounted\n");
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printf(" name - file name, which will be used be the initrd\n");
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}
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int main(int argc, char **argv)
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{
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int i, nfiles = (argc - 2) / 2;
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initrd_header_t header;
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initrd_file_desc_t* file_desc;
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off_t offset;
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FILE* istream;
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FILE* ostream;
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if ((argc < 4) || (strcmp(argv[1], "-h") == 0)) {
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print_options();
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return 0;
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}
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memset(&header, 0x00, sizeof(initrd_header_t));
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header.magic = INITRD_MAGIC_NUMBER;
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header.nfiles = nfiles;
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strncpy(header.mount_point, argv[1], MAX_FNAME);
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file_desc = (initrd_file_desc_t*) malloc(sizeof(initrd_file_desc_t)*nfiles);
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if (!file_desc) {
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fprintf(stderr, "No enough memory\n");
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return -1;
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}
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memset(file_desc, 0x00, sizeof(initrd_file_desc_t)*nfiles);
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offset = sizeof(initrd_header_t) + nfiles * sizeof(initrd_file_desc_t);
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for(i=0; i<nfiles; i++) {
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strncpy(file_desc[i].fname, argv[3 + i * 2], MAX_FNAME);
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if (offset % PAGE_SIZE)
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offset += PAGE_SIZE - offset % PAGE_SIZE;
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file_desc[i].offset = offset;
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istream = fopen(argv[2 + i * 2], "r");
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if (istream == NULL) {
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fprintf(stderr, "Error: file not found: %s\n", argv[2 + i * 2]);
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return -1;
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}
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fseek(istream, 0, SEEK_END);
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file_desc[i].length = ftell(istream);
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offset += file_desc[i].length;
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fclose(istream);
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}
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ostream = fopen("./initrd.img", "w");
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if (ostream == NULL) {
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fprintf(stderr, "Error: unable to create file\n");
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return -1;
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}
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fwrite(&header, sizeof(initrd_header_t), 1, ostream);
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fwrite(file_desc, sizeof(initrd_file_desc_t), nfiles, ostream);
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for(i=0; i<nfiles; i++) {
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unsigned char *buf = (unsigned char *)malloc(file_desc[i].length);
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size_t curr, len = file_desc[i].length;
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istream = fopen(argv[2 + i * 2], "r");
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while (ftell(ostream) < file_desc[i].offset)
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fwrite(buf, 1, sizeof(unsigned char), ostream);
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do {
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curr = fread(buf, 1, len, istream);
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fwrite(buf, 1, len, ostream);
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len -= curr;
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} while(len > 0);
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fclose(istream);
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free(buf);
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}
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fclose(ostream);
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return 0;
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}
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