add skipcpio utility
skipcpio skips a cpio archive at the beginning of a file. It is used for skipping an early cpio archive for lsinitrd.master
Harald Hoyer
parent
8e5db363e8
commit
9ea68421f6
13
Makefile
13
Makefile
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@ -41,7 +41,7 @@ manpages = $(man1pages) $(man5pages) $(man7pages) $(man8pages)
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.PHONY: install clean archive rpm testimage test all check AUTHORS doc dracut-version.sh
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all: dracut-version.sh dracut-install
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all: dracut-version.sh dracut-install skipcpio/skipcpio
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DRACUT_INSTALL_OBJECTS = \
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install/dracut-install.o \
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@ -64,8 +64,15 @@ install/dracut-install: $(DRACUT_INSTALL_OBJECTS)
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dracut-install: install/dracut-install
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ln -fs $< $@
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SKIPCPIO_OBJECTS= \
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skipcpio/skipcpio.o
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skipcpio/skipcpio.o: skipcpio/skipcpio.c
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skipcpio/skipcpio: skipcpio/skipcpio.o
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indent:
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indent -i8 -nut -br -linux -l120 install/dracut-install.c
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indent -i8 -nut -br -linux -l120 skipcpio/skipcpio.c
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doc: $(manpages) dracut.html
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@ -139,6 +146,9 @@ endif
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if [ -f install/dracut-install ]; then \
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install -m 0755 install/dracut-install $(DESTDIR)$(pkglibdir)/dracut-install; \
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fi
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if [ -f skipcpio/skipcpio ]; then \
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install -m 0755 skipcpio/skipcpio $(DESTDIR)$(pkglibdir)/skipcpio; \
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fi
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mkdir -p $(DESTDIR)${prefix}/lib/kernel/install.d
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install -m 0755 50-dracut.install $(DESTDIR)${prefix}/lib/kernel/install.d/50-dracut.install
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install -m 0755 51-dracut-rescue.install $(DESTDIR)${prefix}/lib/kernel/install.d/51-dracut-rescue.install
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@ -158,6 +168,7 @@ clean:
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$(RM) dracut-*.rpm dracut-*.tar.bz2 dracut-*.tar.xz
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$(RM) dracut-version.sh
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$(RM) dracut-install install/dracut-install $(DRACUT_INSTALL_OBJECTS)
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$(RM) skipcpio/skipcpio $(SKIPCPIO_OBJECTS)
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$(RM) $(manpages) dracut.html
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$(MAKE) -C test clean
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@ -0,0 +1,123 @@
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/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/* dracut-install.c -- install files and executables
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Copyright (C) 2012 Harald Hoyer
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Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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This program is free software: you can redistribute it and/or modify
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; If not, see <http://www.gnu.org/licenses/>.
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*/
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#define PROGRAM_VERSION_STRING "1"
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdbool.h>
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#include <stdio.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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#define CPIO_END "TRAILER!!!"
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#define CPIO_ENDLEN (sizeof(CPIO_END)-1)
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static char buf[CPIO_ENDLEN * 2 + 1];
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int main(int argc, char **argv)
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{
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FILE *f;
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size_t s;
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long pos = 0;
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if (argc != 2) {
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fprintf(stderr, "Usage: %s <file>\n", argv[0]);
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exit(1);
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}
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f = fopen(argv[1], "r");
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if (f == NULL) {
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fprintf(stderr, "Cannot open file '%s'\n", argv[1]);
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exit(1);
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}
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s = fread(buf, 6, 1, f);
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if (s <= 0) {
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fprintf(stderr, "Read error from file '%s'\n", argv[1]);
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fclose(f);
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exit(1);
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}
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fseek(f, 0, SEEK_SET);
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/* check, if this is a cpio archive */
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if ((buf[0] == 0x71 && buf[1] == 0xc7)
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|| (buf[0] == '0' && buf[1] == '7' && buf[0] == '0' && buf[1] == '7' && buf[0] == '0' && buf[1] == '1')) {
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/* Search for CPIO_END */
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do {
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char *h;
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fseek(f, pos, SEEK_SET);
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buf[sizeof(buf) - 1] = 0;
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s = fread(buf, CPIO_ENDLEN, 2, f);
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if (s <= 0)
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break;
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h = strstr(buf, CPIO_END);
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if (h) {
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pos = (h - buf) + pos + CPIO_ENDLEN;
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fseek(f, pos, SEEK_SET);
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break;
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}
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pos += CPIO_ENDLEN;
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} while (!feof(f));
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if (feof(f)) {
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/* CPIO_END not found, just cat the whole file */
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fseek(f, 0, SEEK_SET);
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} else {
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/* skip zeros */
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while (!feof(f)) {
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size_t i;
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buf[sizeof(buf) - 1] = 0;
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s = fread(buf, 1, sizeof(buf) - 1, f);
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if (s <= 0)
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break;
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for (i = 0; (i < s) && (buf[i] == 0); i++) ;
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if (buf[i] != 0) {
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pos += i;
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fseek(f, pos, SEEK_SET);
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break;
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}
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pos += s;
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}
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}
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}
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/* cat out the rest */
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while (!feof(f)) {
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s = fread(buf, 1, sizeof(buf), f);
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if (s <= 0)
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break;
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s = fwrite(buf, 1, s, stdout);
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if (s <= 0)
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break;
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}
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fclose(f);
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}
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