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https://github.com/libguestfs/libguestfs.git
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9e82936393
This is useful for generating Linux initramfses from other types of filesystems. For example: guestfish --ro -a disk.img -i cpio-out / - | gzip -9 > initrd.img
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2014 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include "read-file.h"
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#include "guestfs_protocol.h"
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#include "daemon.h"
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#include "actions.h"
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#include "optgroups.h"
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GUESTFSD_EXT_CMD(str_cpio, cpio);
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/* Has one FileOut parameter. */
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/* Takes optional arguments, consult optargs_bitmask. */
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int
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do_cpio_out (const char *dir, const char *format)
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{
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CLEANUP_FREE char *buf = NULL;
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struct stat statbuf;
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int r;
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FILE *fp;
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CLEANUP_FREE char *cmd = NULL;
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char buffer[GUESTFS_MAX_CHUNK_SIZE];
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/* Check the filename exists and is a directory (RHBZ#908322). */
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buf = sysroot_path (dir);
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if (buf == NULL) {
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reply_with_perror ("malloc");
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return -1;
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}
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if (stat (buf, &statbuf) == -1) {
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reply_with_perror ("stat: %s", dir);
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return -1;
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}
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if (! S_ISDIR (statbuf.st_mode)) {
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reply_with_error ("%s: not a directory", dir);
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return -1;
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}
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/* Check the format is one of the permitted ones. */
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if ((optargs_bitmask & GUESTFS_CPIO_OUT_FORMAT_BITMASK)) {
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if (STRNEQ (format, "newc") && STRNEQ (format, "crc")) {
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reply_with_error ("%s: format must be 'newc' or 'crc'", format);
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return -1;
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}
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}
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else
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format = "newc";
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if (asprintf_nowarn (&cmd, "cd %Q && find -print0 | %s -0 -o -H %s --quiet",
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buf,
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str_cpio,
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format) == -1) {
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reply_with_perror ("asprintf");
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return -1;
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}
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if (verbose)
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fprintf (stderr, "%s\n", cmd);
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fp = popen (cmd, "r");
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if (fp == NULL) {
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reply_with_perror ("%s", cmd);
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return -1;
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}
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/* Now we must send the reply message, before the file contents. After
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* this there is no opportunity in the protocol to send any error
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* message back. Instead we can only cancel the transfer.
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*/
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reply (NULL, NULL);
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while ((r = fread (buffer, 1, sizeof buffer, fp)) > 0) {
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if (send_file_write (buffer, r) < 0) {
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pclose (fp);
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return -1;
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}
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}
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if (ferror (fp)) {
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fprintf (stderr, "fread: %s: %m\n", dir);
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send_file_end (1); /* Cancel. */
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pclose (fp);
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return -1;
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}
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if (pclose (fp) != 0) {
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fprintf (stderr, "pclose: %s: %m\n", dir);
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send_file_end (1); /* Cancel. */
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return -1;
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}
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if (send_file_end (0)) /* Normal end of file. */
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return -1;
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return 0;
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}
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