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gen_init_cpio: support -o <output_file> parameter

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This is another preparatory change to allow for reflink-optimized
cpio archives with file data written / cloned via copy_file_range().
The output file is truncated prior to write, so that it maps to
usr/gen_initramfs.sh usage. It may make sense to offer an append option
in future, for easier archive concatenation.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Nicolas Schier <nsc@kernel.org>
Link: https://lore.kernel.org/r/20250819032607.28727-3-ddiss@suse.de
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
This commit is contained in:
David Disseldorp 2025-08-19 13:05:45 +10:00 committed by Nathan Chancellor
parent 1400227773
commit ae18b94099
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GPG key ID: 1D6B269171C01A96
1 changed files with 16 additions and 4 deletions
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20
usr/gen_init_cpio.c
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@ -1,4 +1,5 @@
// SPDX-License-Identifier: GPL-2.0 // SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <stdint.h> #include <stdint.h>
@ -110,7 +111,7 @@ static int cpio_trailer(void)
push_pad(padlen(offset, 512)) < 0) push_pad(padlen(offset, 512)) < 0)
return -1; return -1;
return 0; return fsync(outfd);
} }
static int cpio_mkslink(const char *name, const char *target, static int cpio_mkslink(const char *name, const char *target,
@ -532,7 +533,7 @@ static int cpio_mkfile_line(const char *line)
static void usage(const char *prog) static void usage(const char *prog)
{ {
fprintf(stderr, "Usage:\n" fprintf(stderr, "Usage:\n"
"\t%s [-t <timestamp>] [-c] <cpio_list>\n" "\t%s [-t <timestamp>] [-c] [-o <output_file>] <cpio_list>\n"
"\n" "\n"
"<cpio_list> is a file containing newline separated entries that\n" "<cpio_list> is a file containing newline separated entries that\n"
"describe the files to be included in the initramfs archive:\n" "describe the files to be included in the initramfs archive:\n"
@ -569,7 +570,8 @@ static void usage(const char *prog)
"as mtime for symlinks, directories, regular and special files.\n" "as mtime for symlinks, directories, regular and special files.\n"
"The default is to use the current time for all files, but\n" "The default is to use the current time for all files, but\n"
"preserve modification time for regular files.\n" "preserve modification time for regular files.\n"
"-c: calculate and store 32-bit checksums for file data.\n", "-c: calculate and store 32-bit checksums for file data.\n"
"<output_file>: write cpio to this file instead of stdout\n",
prog); prog);
} }
@ -611,7 +613,7 @@ int main (int argc, char *argv[])
default_mtime = time(NULL); default_mtime = time(NULL);
while (1) { while (1) {
int opt = getopt(argc, argv, "t:ch"); int opt = getopt(argc, argv, "t:cho:");
char *invalid; char *invalid;
if (opt == -1) if (opt == -1)
@ -630,6 +632,16 @@ int main (int argc, char *argv[])
case 'c': case 'c':
do_csum = true; do_csum = true;
break; break;
case 'o':
outfd = open(optarg,
O_WRONLY | O_CREAT | O_LARGEFILE | O_TRUNC,
0600);
if (outfd < 0) {
fprintf(stderr, "failed to open %s\n", optarg);
usage(argv[0]);
exit(1);
}
break;
case 'h': case 'h':
case '?': case '?':
usage(argv[0]); usage(argv[0]);