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[image] Add "imgextract" command for extracting archive images

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Add the concept of extracting an image from an archive (which could be
a single-file archive such as a gzip-compressed file), along with an
"imgextract" command to expose this functionality to scripts.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2021-05-06 13:11:31 +01:00
parent de4f31cdca
commit 5c9c8d2b9b
9 changed files with 326 additions and 0 deletions
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104
src/core/archive.c Normal file
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/*
* Copyright (C) 2021 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <string.h>
#include <errno.h>
#include <ipxe/image.h>
/** @file
*
* Archive images
*
*/
/**
* Extract archive image
*
* @v image Image
* @v name Extracted image name
* @v extracted Extracted image to fill in
* @ret rc Return status code
*/
int image_extract ( struct image *image, const char *name,
struct image **extracted ) {
char *dot;
int rc;
/* Check that this image can be used to extract an archive image */
if ( ! ( image->type && image->type->extract ) ) {
rc = -ENOTSUP;
goto err_unsupported;
}
/* Allocate new image */
*extracted = alloc_image ( image->uri );
if ( ! *extracted ) {
rc = -ENOMEM;
goto err_alloc;
}
/* Set image name */
if ( ( rc = image_set_name ( *extracted,
( name ? name : image->name ) ) ) != 0 ) {
goto err_set_name;
}
/* Strip any archive or compression suffix from implicit name */
if ( ( ! name ) && ( (*extracted)->name ) &&
( ( dot = strrchr ( (*extracted)->name, '.' ) ) != NULL ) ) {
*dot = '\0';
}
/* Try extracting archive image */
if ( ( rc = image->type->extract ( image, *extracted ) ) != 0 ) {
DBGC ( image, "IMAGE %s could not extract image: %s\n",
image->name, strerror ( rc ) );
goto err_extract;
}
/* Register image */
if ( ( rc = register_image ( *extracted ) ) != 0 )
goto err_register;
/* Drop local reference to image */
image_put ( *extracted );
return 0;
unregister_image ( *extracted );
err_register:
err_extract:
err_set_name:
image_put ( *extracted );
err_alloc:
err_unsupported:
return rc;
}
/* Drag in objects via image_extract() */
REQUIRING_SYMBOL ( image_extract );
/* Drag in archive image formats */
REQUIRE_OBJECT ( config_archive );