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191 lines
6.2 KiB
191 lines
6.2 KiB
![]()
6 years ago
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From a3dc6a721873f0365612a5acee952a5f7d33853a Mon Sep 17 00:00:00 2001
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From: Harald Hoyer <harald@redhat.com>
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Date: Fri, 24 Jan 2014 15:27:51 +0100
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Subject: [PATCH] add skipcpio utility
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skipcpio skips a cpio archive at the beginning of a file.
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It is used for skipping an early cpio archive for lsinitrd.
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---
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Makefile | 13 +++++-
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skipcpio/skipcpio.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 135 insertions(+), 1 deletion(-)
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create mode 100644 skipcpio/skipcpio.c
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diff --git a/Makefile b/Makefile
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index e7da9484..5441d8f4 100644
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--- a/Makefile
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+++ b/Makefile
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@@ -40,7 +40,7 @@ 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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@@ -61,8 +61,15 @@ 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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+
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+skipcpio/skipcpio.o: skipcpio/skipcpio.c
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+skipcpio/skipcpio: skipcpio/skipcpio.o
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+
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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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@@ -136,6 +143,9 @@ 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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@@ -155,6 +165,7 @@ clean:
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$(RM) dracut-*.rpm dracut-*.tar.bz2
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$(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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diff --git a/skipcpio/skipcpio.c b/skipcpio/skipcpio.c
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new file mode 100644
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index 00000000..fbf391bf
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--- /dev/null
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+++ b/skipcpio/skipcpio.c
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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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+
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+/* dracut-install.c -- install files and executables
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+
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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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+
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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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+
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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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+
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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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+
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+#define PROGRAM_VERSION_STRING "1"
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+
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+#ifndef _GNU_SOURCE
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+#define _GNU_SOURCE
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+#endif
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+
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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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+
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+#define CPIO_END "TRAILER!!!"
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+#define CPIO_ENDLEN (sizeof(CPIO_END)-1)
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+
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+static char buf[CPIO_ENDLEN * 2 + 1];
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+
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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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+
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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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+
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+ f = fopen(argv[1], "r");
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ for (i = 0; (i < s) && (buf[i] == 0); i++) ;
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+
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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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+
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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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+
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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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