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190 lines
6.2 KiB
190 lines
6.2 KiB
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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