cmdline, linuxrc, Makefile
This commit is contained in:
Denis Knauf
commit
4c5ec0343d
25
Makefile
Normal file
25
Makefile
Normal file
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@ -0,0 +1,25 @@
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CC ?= cc
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INSTALL ?= install
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RM ?= rm
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D ?= /
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PREFIX ?= /
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BIN_PREFIX ?= $(PREFIX)/bin
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CFLAGS ?= -Os
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all: cmdline
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cmdline: cmdline.c
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$(CC) $(CFLAGS) -o $@ -Dcmdline_main=main $<
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install:
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$(INSTALL) -D -m 0755 cmdline $(D)/$(BIN_PREFIX)
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$(INSTALL) -D -m 0744 isirc $(D)/$(BIN_PREFIX)
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$(LN) -s isirc $(D)/init
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$(LN) -s isirc $(D)/linuxrc
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clean:
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$(RM) cmdline
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.PHONY: all install clean
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159
cmdline.c
Normal file
159
cmdline.c
Normal file
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@ -0,0 +1,159 @@
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#define MAXREAD 1024
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int scan( const char *key, const char *arg) {
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int i = 0;
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for( i = 0; key[i] && arg[i] && key[i] == arg[i]; i++);
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if( key[i])
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return 0;
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switch( arg[i]) {
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case '=':
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puts( arg+i+1);
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case 0:
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return 1;
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}
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return 0;
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}
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#define IFS( X) ((X) == 0 || (X) == ' ' || (X) == '\t' || (X) == '\n' || (X) == '\r')
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#define BUFREAD( I, S, D, F, M, E) \
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if( !( ++i < s)) { \
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if( -1 == (s = read( fd, d, MAXREAD))) \
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goto ERROR; \
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if( !s) \
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break; \
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i = 0; \
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}
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int scan_fd( char *key, int fd, char **val) {
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ssize_t s = 0;
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char *d = malloc( MAXREAD);
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int i = 0, j, ret = 0;
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if( -1 == (s = read( fd, d, MAXREAD)))
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goto ERROR;
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while( s) {
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// liest solange ein leeres zeichen da ist.
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while( IFS( d[i]))
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BUFREAD( i, s, d, fd, MAXREAD, ERROR);
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// vergleicht das naechste wort mit dem schluessel.
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j = 0;
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while( key[j] && d[i] == key[j]) {
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j++;
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BUFREAD( i, s, d, fd, MAXREAD, ERROR);
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}
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// wenn das letzte zeichen vom schluessel erreicht wurde,
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// stimmt der schluessel mit dem gescanten wort ueberein.
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if( !key[j] && ( d[i] == '=' || IFS( d[i])))
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goto FOUND;
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while( !IFS( d[i]))
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BUFREAD( i, s, d, fd, MAXREAD, ERROR);
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}
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free( d);
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return 0;
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FOUND:
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// key gefunden und der wert wird ausgegeben.
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if( d[i] == '=') {
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char *p;
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i++;
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for( j = 0; i+j < s && !IFS( d[i+j]); j++);
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if( !(p = malloc( j+1)))
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goto ERROR;
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memcpy( p, d+i, j);
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i = 0;
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if( !IFS( d[i+j])) {
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if( -1 == (s = read( fd, d, MAXREAD)))
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goto ERROR;
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if( s) {
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while( !IFS( d[i]) && s) {
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if( !( ++i < s)) {
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if( !(p = realloc( p, j+i+1)))
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goto ERROR;
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memcpy( p+j, d, i);
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j += i;
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if( -1 == (s = read( fd, d, MAXREAD)))
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goto ERROR;
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if( !s)
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break;
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}
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}
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if( !(p = realloc( p, j+i+1)))
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goto ERROR;
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memcpy( p+j, d, i);
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}
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}
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p[j+i] = 0;
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*val = p;
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ret = 1;
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}
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// key gefunden, hat aber keinen wert, der ausgegeben werden muss.
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else
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ret = 2;
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free( d);
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return ret;
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ERROR:
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free( d);
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return -1;
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}
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extern int cmdline_main( int argc, char **argv) {
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int i = 0, action = 'a', fd = 0, ret = 255;
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char c, *key = NULL, *val, *file = "/proc/cmdline";
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while( (c = getopt( argc, argv, "+hcf:")) != -1)
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switch( c) {
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case 'h':
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fprintf( stderr, "usage: %s [-c] [-f file] keyword [args...]\n", argv[0]);
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fprintf( stderr, "parse the linux-like cmdline, which are given via args or:\n");
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fprintf( stderr, "\t-c: cmdline; -f file: file. file can be '-'.\n");
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exit( 0);
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case 'f': file = optarg;
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case 'c': action = 'f';
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}
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if( !( argc > optind))
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return 3;
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key = argv[optind];
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switch( action) {
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case 'a':
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for( i = optind+1; i < argc; i++)
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if( scan( key, argv[i])) {
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ret = 0;
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break;
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}
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break;
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case 'f':
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if( !( file[0] == '-' && file[1] == 0))
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if( -1 == (fd = open( file, O_RDONLY))) {
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perror( argv[0]);
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ret = 2;
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}
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switch( scan_fd( key, fd, &val)) {
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case 1:
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puts( val);
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case 2:
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ret = 0;
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break;
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case 0:
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ret = 1;
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break;
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case -1:
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ret = 2;
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perror( argv[0]);
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}
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if( !fd)
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close( fd);
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}
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return ret;
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}
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90
linuxrc
Executable file
90
linuxrc
Executable file
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@ -0,0 +1,90 @@
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#!/bin/sh
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QUITE=false
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log() {
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if [ "X$QUITE" != "Xtrue" ]
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then
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echo "$*"
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fi
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}
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err() {
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echo "$*" >&2
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}
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if [ "x${1}x" != "x-rx" ]
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then
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exec </dev/console >/dev/console 2>&1
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log "### ISIRD ###"
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PATH=/bin
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cd /
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log " mount proc and sysfs and / as rw"
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mount -t proc proc /proc
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mount -t sysfs sysfs /sys
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mount -o remount,rw /
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log " mdev"
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mdev -s
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log " activate volume groups"
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vgscan --mknodes --ignorelockingfailure
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vgchange --ignorelockingfailure -P -a y
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if cmdline -c isirdsh
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then
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log " start shell"
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exec sh
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fi
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else
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log " returned"
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fi
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log " detect cmdline options..."
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ROOT="$(cmdline -c root)"
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log " root: #{ROOT}"
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FLAGS="$(cmdline -c rootflags)"
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log " flags: ${FLAGS}"
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if cmdline -c ro
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then
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FLAGS="${FLAGS},ro"
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elif cmdline -c rw
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then
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FLAGS="${FLAGS},rw"
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fi
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log " flags: ${FLAGS}"
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FSTYPE="$(cmdline -c rootfstype)"
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FSTYPE="${FSTYPE:-auto}"
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log " umount sysfs"
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umount /sys
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FLAGS="${FLAGS#,}"
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log " mount ${ROOT} as ${FSTYPE} with ${FLAGS}"
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if ! mount -o "${FLAGS}" -t "${FSTYPE}" "${ROOT}" /mnt
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then
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err "Can't mount root!"
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exec sh
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fi
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if ! test -d /mnt/initrd || mkdir /mnt/initrd
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then
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err "/initrd doesn't exist on root!"
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exec sh
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fi
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log " Change to new root"
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cd /mnt
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if ! pivot_root . initrd
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then
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err "Can't pivot root!"
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cd /
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exec sh
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fi
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log " OK :)"
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export LD_LIBRARY_PATH="/initrd/lib"
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LD_SO="${LD_LIBRARY_PATH}/ld-linux.so.2"
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${LD_SO} /initrd/bin/ls /mnt/dev/*
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echo 0x0100 > /initrd/proc/sys/kernel/real-root-dev
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${LD_SO} /initrd/bin/umount -n /initrd/proc
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exit 0
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