;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix 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 GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (guix rpm)
#:autoload (gcrypt hash) (hash-algorithm file-hash md5)
#:use-module (guix build utils)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (ice-9 textual-ports)
#:use-module (rnrs bytevectors)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-71)
#:use-module (srfi srfi-171)
#:export (generate-lead
generate-signature
generate-header
assemble-rpm-metadata
;; XXX: These are internals, but the inline disabling trick
;; doesn't work on them.
make-header-entry
header-entry?
header-entry-tag
header-entry-count
header-entry-value
bytevector->hex-string
fhs-directory?))
;;; Commentary:
;;;
;;; This module provides the building blocks required to construct RPM
;;; archives. It is intended to be importable on the build side, so shouldn't
;;; depend on (guix diagnostics) or other host-side-only modules.
;;;
;;; Code:
(define (gnu-system-triplet->machine-type triplet)
"Return the machine component of TRIPLET, a GNU system triplet."
(first (string-split triplet #\-)))
(define (gnu-machine-type->rpm-arch type)
"Return the canonical RPM architecture string, given machine TYPE."
(match type
("arm" "armv7hl")
("powerpc" "ppc")
("powerpc64le" "ppc64le")
(machine machine))) ;unchanged
(define (gnu-machine-type->rpm-number type)
"Translate machine TYPE to its corresponding RPM integer value."
;; Refer to the rpmrc.in file in the RPM source for the complete
;; translation tables.
(match type
((or "i486" "i586" "i686" "x86_64") 1)
((? (cut string-prefix? "powerpc" <>)) 5)
("mips64el" 11)
((? (cut string-prefix? "arm" <>)) 12)
("aarch64" 19)
((? (cut string-prefix? "riscv" <>)) 22)
(_ (error "no RPM number known for machine type" type))))
(define (u16-number->u8-list number)
"Return a list of byte values made of NUMBER, a 16 bit unsigned integer."
(let ((bv (uint-list->bytevector (list number) (endianness big) 2)))
(bytevector->u8-list bv)))
(define (u32-number->u8-list number)
"Return a list of byte values made of NUMBER, a 32 bit unsigned integer."
(let ((bv (uint-list->bytevector (list number) (endianness big) 4)))
(bytevector->u8-list bv)))
(define (s32-number->u8-list number)
"Return a list of byte values made of NUMBER, a 32 bit signed integer."
(let ((bv (sint-list->bytevector (list number) (endianness big) 4)))
(bytevector->u8-list bv)))
(define (u8-list->u32-number lst)
"Return the 32 bit unsigned integer corresponding to the 4 bytes in LST."
(bytevector-u32-ref (u8-list->bytevector lst) 0 (endianness big)))
;;;
;;; Lead section.
;;;
;; Refer to the docs/manual/format.md file of the RPM source for the details
;; regarding the binary format of an RPM archive.
(define* (generate-lead name-version #:key (target %host-type))
"Generate a RPM lead u8-list that uses NAME-VERSION, the name and version
string of the package, and TARGET, a GNU triplet used to derive the target
machine type."
(define machine-type (gnu-system-triplet->machine-type target))
(define magic (list #xed #xab #xee #xdb))
(define file-format-version (list 3 0)) ;3.0
(define type (list 0 0)) ;0 for binary packages
(define arch-number (u16-number->u8-list
(gnu-machine-type->rpm-number machine-type)))
;; The 66 bytes from 10 to 75 are for the name-version-release string.
(define name
(let ((padding-bytes (make-list (- 66 (string-length name-version)) 0)))
(append (bytevector->u8-list (string->utf8 name-version))
padding-bytes)))
;; There is no OS number corresponding to GNU/Hurd (GNU), only Linux, per
;; rpmrc.in.
(define os-number (list 0 1))
;; For RPM format 3.0, the signature type is 5, which means a "Header-style"
;; signature.
(define signature-type (list 0 5))
(define reserved-bytes (make-list 16 0))
(append magic file-format-version type arch-number name
os-number signature-type reserved-bytes))
;;;
;;; Header section.
;;;
(define header-magic (list #x8e #xad #xe8))
(define header-version (list 1))
(define header-reserved (make-list 4 0)) ;4 reserved bytes
;;; Every header starts with 8 bytes made by the header magic number, the
;;; header version and 4 reserved bytes.
(define header-intro (append header-magic header-version header-reserved))
;;; Header entry data types.
(define NULL 0)
(define CHAR 1)
(define INT8 2)
(define INT16 3) ;2-bytes aligned
(define INT32 4) ;4-bytes aligned
(define INT64 5) ;8-bytes aligned
(define STRING 6)
(define BIN 7)
(define STRING_ARRAY 8)
(define I18NSTRIN_TYPE 9)
;;; Header entry tags.
(define-record-type <rpm-tag>
(make-rpm-tag number type)
rpm-tag?
(number rpm-tag-number)
(type rpm-tag-type))
;;; The following are internal tags used to identify the data sections.
(define RPMTAG_HEADERSIGNATURES (make-rpm-tag 62 BIN)) ;signature header
(define RPMTAG_HEADERIMMUTABLE (make-rpm-tag 63 BIN)) ;main/data header
(define RPMTAG_HEADERI18NTABLE (make-rpm-tag 100 STRING_ARRAY))
;;; Subset of RPM tags from include/rpm/rpmtag.h.
(define RPMTAG_NAME (make-rpm-tag 1000 STRING))
(define RPMTAG_VERSION (make-rpm-tag 1001 STRING))
(define RPMTAG_RELEASE (make-rpm-tag 1002 STRING))
(define RPMTAG_SUMMARY (make-rpm-tag 1004 STRING))
(define RPMTAG_SIZE (make-rpm-tag 1009 INT32))
(define RPMTAG_LICENSE (make-rpm-tag 1014 STRING))
(define RPMTAG_OS (make-rpm-tag 1021 STRING))
(define RPMTAG_ARCH (make-rpm-tag 1022 STRING))
(define RPMTAG_PREIN (make-rpm-tag 1023 STRING))
(define RPMTAG_POSTIN (make-rpm-tag 1024 STRING))
(define RPMTAG_PREUN (make-rpm-tag 1025 STRING))
(define RPMTAG_POSTUN (make-rpm-tag 1026 STRING))
(define RPMTAG_FILESIZES (make-rpm-tag 1028 INT32))
(define RPMTAG_FILEMODES (make-rpm-tag 1030 INT16))
(define RPMTAG_FILEDIGESTS (make-rpm-tag 1035 STRING_ARRAY))
(define RPMTAG_FILELINKTOS (make-rpm-tag 1036 STRING_ARRAY))
(define RPMTAG_FILEUSERNAME (make-rpm-tag 1039 STRING_ARRAY))
(define RPMTAG_GROUPNAME (make-rpm-tag 1040 STRING_ARRAY))
(define RPMTAG_PREFIXES (make-rpm-tag 1098 STRING_ARRAY))
(define RPMTAG_DIRINDEXES (make-rpm-tag 1116 INT32))
(define RPMTAG_BASENAMES (make-rpm-tag 1117 STRING_ARRAY))
(define RPMTAG_DIRNAMES (make-rpm-tag 1118 STRING_ARRAY))
(define RPMTAG_PAYLOADFORMAT (make-rpm-tag 1124 STRING))
(define RPMTAG_PAYLOADCOMPRESSOR (make-rpm-tag 1125 STRING))
(define RPMTAG_LONGFILESIZES (make-rpm-tag 5008 INT64))
(define RPMTAG_LONGSIZE (make-rpm-tag 5009 INT64))
;;; The algorithm used to compute the digest of each file, e.g. RPM_HASH_MD5.
(define RPMTAG_FILEDIGESTALGO (make-rpm-tag 5011 INT32))
;;; RPMTAG_ENCODING specifies the encoding used for strings, e.g. "utf-8".
(define RPMTAG_ENCODING (make-rpm-tag 5062 STRING))
;;; Compressed payload digest. Its type is a string array, but currently in
;;; practice it is equivalent to STRING, since only the first element is used.
(define RPMTAG_PAYLOADDIGEST (make-rpm-tag 5092 STRING_ARRAY))
;;; The algorithm used to compute the payload digest, e.g. RPM_HASH_SHA256.
(define RPMTAG_PAYLOADDIGESTALGO (make-rpm-tag 5093 INT32))
;;; The following are taken from the rpmHashAlgo_e enum in rpmcrypto.h.
(define RPM_HASH_MD5 1)
(define RPM_HASH_SHA256 8)
;;; Other useful internal definitions.
(define REGION_TAG_COUNT 16) ;number of bytes
(define INT32_MAX (1- (expt 2 32))) ;4294967295 bytes (unsigned)
(define (rpm-tag->u8-list tag)
"Return the u8 list corresponding to RPM-TAG, a <rpm-tag> object."
(append (u32-number->u8-list (rpm-tag-number tag))
(u32-number->u8-list (rpm-tag-type tag))))
(define-record-type <header-entry>
(make-header-entry tag count value)
header-entry?
(tag header-entry-tag) ;<rpm-tag>
(count header-entry-count) ;number (u32)
(value header-entry-value)) ;string|number|list|...
(define (entry-type->alignement type)
"Return the byte alignment of TYPE, an RPM header entry type."
(cond ((= INT16 type) 2)
((= INT32 type) 4)
((= INT64 type) 8)
(else 1)))
(define (next-aligned-offset offset alignment)
"Return the next position from OFFSET which satisfies ALIGNMENT."
(if (= 0 (modulo offset alignment))
offset
(next-aligned-offset (1+ offset) alignment)))
(define (header-entry->data entry)
"Return the data of ENTRY, a <header-entry> object, as a u8 list."
(let* ((tag (header-entry-tag entry))
(count (header-entry-count entry))
(value (header-entry-value entry))
(number (rpm-tag-number tag))
(type (rpm-tag-type tag)))
(cond
((= STRING type)
(unless (string? value)
(error "expected string value for STRING type, got" value))
(unless (= 1 count)
(error "count must be 1 for STRING type"))
(let ((value (cond ((= (rpm-tag-number RPMTAG_VERSION) number)
;; Hyphens are not allowed in version strings.
(string-map (match-lambda
(#\- #\+)
(c c))
value))
(else value))))
(append (bytevector->u8-list (string->utf8 value))
(list 0)))) ;strings must end with null byte
((= STRING_ARRAY type)
(unless (list? value)
(error "expected a list of strings for STRING_ARRAY type, got" value))
(unless (= count (length value))
(error "expected count to be equal to" (length value) 'got count))
(append-map (lambda (s)
(append (bytevector->u8-list (string->utf8 s))
(list 0))) ;null byte separated
value))
((member type (list INT8 INT16 INT32))
(if (= 1 count)
(unless (number? value)
(error "expected number value for scalar INT type; got" value))
(unless (list? value)
(error "expected list value for array INT type; got" value)))
(if (list? value)
(cond ((= INT8 type) value)
((= INT16 type) (append-map u16-number->u8-list value))
((= INT32 type) (append-map u32-number->u8-list value))
(else (error "unexpected type" type)))
(cond ((= INT8 type) (list value))
((= INT16 type) (u16-number->u8-list value))
((= INT32 type) (u32-number->u8-list value))
(else (error "unexpected type" type)))))
((= BIN type)
(unless (list? value)
(error "expected list value for BIN type; got" value))
value)
(else (error "unimplemented type" type)))))
(define (make-header-index+data entries)
"Return the index and data sections as u8 number lists, via multiple values.
An index is composed of four u32 (16 bytes total) quantities, in order: tag,
type, offset and count."
(match (fold (match-lambda*
((entry (offset . (index . data)))
(let* ((tag (header-entry-tag entry))
(tag-number (rpm-tag-number tag))
(tag-type (rpm-tag-type tag))
(count (header-entry-count entry))
(data* (header-entry->data entry))
(alignment (entry-type->alignement tag-type))
(aligned-offset (next-aligned-offset offset alignment))
(padding (make-list (- aligned-offset offset) 0)))
(cons (+ aligned-offset (length data*))
(cons (append index
(u32-number->u8-list tag-number)
(u32-number->u8-list tag-type)
(u32-number->u8-list aligned-offset)
(u32-number->u8-list count))
(append data padding data*))))))
'(0 . (() . ()))
entries)
((offset . (index . data))
(values index data))))
;; Prevent inlining of the variables/procedures accessed by unit tests.
(set! make-header-index+data make-header-index+data)
(set! RPMTAG_ARCH RPMTAG_ARCH)
(set! RPMTAG_LICENSE RPMTAG_LICENSE)
(set! RPMTAG_NAME RPMTAG_NAME)
(set! RPMTAG_OS RPMTAG_OS)
(set! RPMTAG_RELEASE RPMTAG_RELEASE)
(set! RPMTAG_SUMMARY RPMTAG_SUMMARY)
(set! RPMTAG_VERSION RPMTAG_VERSION)
(define (wrap-in-region-tags header region-tag)
"Wrap HEADER, a header provided as u8-list with REGION-TAG."
(let* ((type (rpm-tag-type region-tag))
(header-intro (take header 16))
(header-rest (drop header 16))
;; Increment the existing index value to account for the added region
;; tag index.
(index-length (1+ (u8-list->u32-number
(drop-right (drop header-intro 8) 4)))) ;bytes 8-11
;; Increment the data length value to account for the added region
;; tag data.
(data-length (+ REGION_TAG_COUNT
(u8-list->u32-number
(take-right header-intro 4))))) ;last 4 bytes of intro
(unless (member region-tag (list RPMTAG_HEADERSIGNATURES
RPMTAG_HEADERIMMUTABLE))
(error "expected RPMTAG_HEADERSIGNATURES or RPMTAG_HEADERIMMUTABLE, got"
region-tag))
(append (drop-right header-intro 8) ;strip existing index and data lengths
(u32-number->u8-list index-length)
(u32-number->u8-list data-length)
;; Region tag (16 bytes).
(u32-number->u8-list (rpm-tag-number region-tag)) ;number
(u32-number->u8-list type) ;type
(u32-number->u8-list (- data-length REGION_TAG_COUNT)) ;offset
(u32-number->u8-list REGION_TAG_COUNT) ;count
;; Immutable region.
header-rest
;; Region tag trailer (16 bytes). Note: the trailer offset value
;; is an enforced convention; it has no practical use.
(u32-number->u8-list (rpm-tag-number region-tag)) ;number
(u32-number->u8-list type) ;type
(s32-number->u8-list (* -1 index-length 16)) ;negative offset
(u32-number->u8-list REGION_TAG_COUNT)))) ;count
(define (bytevector->hex-string bv)
(format #f "~{~2,'0x~}" (bytevector->u8-list bv)))
(define (files->md5-checksums files)
"Return the MD5 checksums (formatted as hexadecimal strings) for FILES."
(let ((file-md5 (cut file-hash (hash-algorithm md5) <>)))
(map (lambda (f)
(or (and=> (false-if-exception (file-md5 f))
bytevector->hex-string)
;; Only regular files (e.g., not directories) can have their
;; checksum computed.
""))
files)))
(define (strip-leading-dot name)
"Remove the leading \".\" from NAME, if present. If a single \".\" is
encountered, translate it to \"/\"."
(match name
("." "/") ;special case
((? (cut string-prefix? "." <>))
(string-drop name 1))
(x name)))
;;; An extensive list of required and optional FHS directories, per its 3.0
;;; revision.
(define %fhs-directories
(list "/bin" "/boot" "/dev"
"/etc" "/etc/opt" "/etc/X11" "/etc/sgml" "/etc/xml"
"/home" "/root" "/lib" "/media" "/mnt"
"/opt" "/opt/bin" "/opt/doc" "/opt/include"
"/opt/info" "/opt/lib" "/opt/man"
"/run" "/sbin" "/srv" "/sys" "/tmp"
"/usr" "/usr/bin" "/usr/include" "/usr/libexec"
"/usr/share" "/usr/share/applications"
"/usr/share/color" "/usr/share/dict" "/usr/share/doc" "/usr/share/games"
"/usr/share/icons" "/usr/share/icons/hicolor"
"/usr/share/icons/hicolor/48x48"
"/usr/share/icons/hicolor/48x48/apps"
"/usr/share/icons/hicolor/scalable"
"/usr/share/icons/hicolor/scalable/apps"
"/usr/share/info" "/usr/share/locale" "/usr/share/man"
"/usr/share/metainfo" "/usr/share/misc"
"/usr/share/nls" "/usr/share/ppd" "/usr/share/sgml"
"/usr/share/terminfo" "/usr/share/tmac" "/usr/share/xml"
"/usr/share/zoneinfo" "/usr/local" "/usr/local/bin" "/usr/local/etc"
"/usr/local/games" "/usr/local/include" "/usr/local/lib"
"/usr/local/man" "/usr/local/sbin" "/usr/local/sbin" "/usr/local/share"
"/usr/local/src" "/var" "/var/account" "/var/backups"
"/var/cache" "/var/cache/fonts" "/var/cache/man" "/var/cache/www"
"/var/crash" "/var/cron" "/var/games" "/var/mail" "/var/msgs"
"/var/lib" "/var/lib/color" "/var/lib/hwclock" "/var/lib/misc"
"/var/local" "/var/lock" "/var/log" "/var/opt" "/var/preserve"
"/var/run" "/var/spool" "/var/spool/lpd" "/var/spool/mqueue"
"/var/spool/news" "/var/spool/rwho" "/var/spool/uucp"
"/var/tmp" "/var/yp"))
(define (fhs-directory? file-name)
"Predicate to check if FILE-NAME is a known File Hierarchy Standard (FHS)
directory."
(member (strip-leading-dot file-name) %fhs-directories))
(define (directory->file-entries directory)
"Return the file lists triplet header entries for the files found under
DIRECTORY."
(with-directory-excursion directory
;; Skip the initial "." directory, as its name would get concatenated with
;; the "./" dirname and fail to match "." in the payload.
(let* ((files (cdr (find-files "." #:directories? #t)))
(file-stats (map lstat files))
(directories
(append (list ".")
(filter-map (match-lambda
((index . file)
(let ((st (list-ref file-stats index)))
(and (eq? 'directory (stat:type st))
file))))
(list-transduce (tenumerate) rcons files))))
;; Omit any FHS directories found in FILES to avoid the RPM package
;; from owning them. This can occur when symlinks directives such
;; as "/usr/bin/hello -> bin/hello" are used.
(package-files package-file-stats
(unzip2 (reverse
(fold (lambda (file stat res)
(if (fhs-directory? file)
res
(cons (list file stat) res)))
'() files file-stats))))
;; When provided with the index of a file, the directory index must
;; return the index of the corresponding directory entry.
(dirindexes (map (lambda (d)
(list-index (cut string=? <> d) directories))
(map dirname package-files)))
;; The files owned are those appearing in 'basenames'; own them
;; all.
(basenames (map basename package-files))
;; The directory names must end with a trailing "/".
(dirnames (map (compose strip-leading-dot (cut string-append <> "/"))
directories))
;; Note: All the file-related entries must have the same length as
;; the basenames entry.
(symlink-targets (map (lambda (f)
(if (symbolic-link? f)
(readlink f)
"")) ;unused
package-files))
(file-modes (map stat:mode package-file-stats))
(file-sizes (map stat:size package-file-stats))
(file-md5s (files->md5-checksums package-files)))
(let ((basenames-length (length basenames))
(dirindexes-length (length dirindexes)))
(unless (= basenames-length dirindexes-length)
(error "length mismatch for dirIndexes; expected/actual"
basenames-length dirindexes-length))
(append
(if (> (apply max file-sizes) INT32_MAX)
(list (make-header-entry RPMTAG_LONGFILESIZES (length file-sizes)
file-sizes)
(make-header-entry RPMTAG_LONGSIZE 1
(reduce + 0 file-sizes)))
(list (make-header-entry RPMTAG_FILESIZES (length file-sizes)
file-sizes)
(make-header-entry RPMTAG_SIZE 1 (reduce + 0 file-sizes))))
(list
(make-header-entry RPMTAG_FILEMODES (length file-modes) file-modes)
(make-header-entry RPMTAG_FILEDIGESTS (length file-md5s) file-md5s)
(make-header-entry RPMTAG_FILEDIGESTALGO 1 RPM_HASH_MD5)
(make-header-entry RPMTAG_FILELINKTOS (length symlink-targets)
symlink-targets)
(make-header-entry RPMTAG_FILEUSERNAME basenames-length
(make-list basenames-length "root"))
(make-header-entry RPMTAG_GROUPNAME basenames-length
(make-list basenames-length "root"))
;; The dirindexes, basenames and dirnames tags form the so-called RPM
;; "path triplet".
(make-header-entry RPMTAG_DIRINDEXES dirindexes-length dirindexes)
(make-header-entry RPMTAG_BASENAMES basenames-length basenames)
(make-header-entry RPMTAG_DIRNAMES (length dirnames) dirnames)))))))
(define (make-header entries)
"Return the u8 list of a RPM header containing ENTRIES, a list of
<rpm-entry> objects."
(let* ((entries (sort entries (lambda (x y)
(< (rpm-tag-number (header-entry-tag x))
(rpm-tag-number (header-entry-tag y))))))
(count (length entries))
(index data (make-header-index+data entries)))
(append header-intro ;8 bytes
(u32-number->u8-list count) ;4 bytes
(u32-number->u8-list (length data)) ;4 bytes
;; Now starts the header index, which can contain up to 32 entries
;; of 16 bytes each.
index data)))
(define* (generate-header name version
payload-digest
payload-directory
payload-compressor
#:key
relocatable?
prein-file postin-file
preun-file postun-file
(target %host-type)
(release "0")
(license "N/A")
(summary "RPM archive generated by GNU Guix.")
(os "Linux")) ;see rpmrc.in
"Return the u8 list corresponding to the Header section. PAYLOAD-DIGEST is
the SHA256 checksum string of the compressed payload. PAYLOAD-DIRECTORY is
the directory containing the payload files. PAYLOAD-COMPRESSOR is the name of
the compressor used to compress the CPIO payload, such as \"none\", \"gz\",
\"xz\" or \"zstd\"."
(let* ((rpm-arch (gnu-machine-type->rpm-arch
(gnu-system-triplet->machine-type target)))
(file->string (cut call-with-input-file <> get-string-all))
(prein-script (and=> prein-file file->string))
(postin-script (and=> postin-file file->string))
(preun-script (and=> preun-file file->string))
(postun-script (and=> postun-file file->string)))
(wrap-in-region-tags
(make-header (append
(list (make-header-entry RPMTAG_HEADERI18NTABLE 1 (list "C"))
(make-header-entry RPMTAG_NAME 1 name)
(make-header-entry RPMTAG_VERSION 1 version)
(make-header-entry RPMTAG_RELEASE 1 release)
(make-header-entry RPMTAG_SUMMARY 1 summary)
(make-header-entry RPMTAG_LICENSE 1 license)
(make-header-entry RPMTAG_OS 1 os)
(make-header-entry RPMTAG_ARCH 1 rpm-arch))
(directory->file-entries payload-directory)
(if relocatable?
;; Note: RPMTAG_PREFIXES must not have a trailing
;; slash, unless it's '/'. This allows installing the
;; package via 'rpm -i --prefix=/tmp', for example.
(list (make-header-entry RPMTAG_PREFIXES 1 (list "/")))
'())
(if prein-script
(list (make-header-entry RPMTAG_PREIN 1 prein-script))
'())
(if postin-script
(list (make-header-entry RPMTAG_POSTIN 1 postin-script))
'())
(if preun-script
(list (make-header-entry RPMTAG_PREUN 1 preun-script))
'())
(if postun-script
(list (make-header-entry RPMTAG_POSTUN 1 postun-script))
'())
(if (string=? "none" payload-compressor)
'()
(list (make-header-entry RPMTAG_PAYLOADCOMPRESSOR 1
payload-compressor)))
(list (make-header-entry RPMTAG_ENCODING 1 "utf-8")
(make-header-entry RPMTAG_PAYLOADFORMAT 1 "cpio")
(make-header-entry RPMTAG_PAYLOADDIGEST 1
(list payload-digest))
(make-header-entry RPMTAG_PAYLOADDIGESTALGO 1
RPM_HASH_SHA256))))
RPMTAG_HEADERIMMUTABLE)))
;;;
;;; Signature section
;;;
;;; Header sha256 checksum.
(define RPMSIGTAG_SHA256 (make-rpm-tag 273 STRING))
;;; Uncompressed payload size.
(define RPMSIGTAG_PAYLOADSIZE (make-rpm-tag 1007 INT32))
;;; Header and compressed payload combined size.
(define RPMSIGTAG_SIZE (make-rpm-tag 1000 INT32))
;;; Uncompressed payload size (when size > max u32).
(define RPMSIGTAG_LONGARCHIVESIZE (make-rpm-tag 271 INT64))
;;; Header and compressed payload combined size (when size > max u32).
(define RPMSIGTAG_LONGSIZE (make-rpm-tag 270 INT64))
;;; Extra space reserved for signatures (typically 32 bytes).
(define RPMSIGTAG_RESERVEDSPACE (make-rpm-tag 1008 BIN))
(define (generate-signature header-sha256
header+compressed-payload-size
;; uncompressed-payload-size
)
"Return the u8 list representing a signature header containing the
HEADER-SHA256 (a string) and the PAYLOAD-SIZE, which is the combined size of
the header and compressed payload."
(define size-tag (if (> header+compressed-payload-size INT32_MAX)
RPMSIGTAG_LONGSIZE
RPMSIGTAG_SIZE))
(wrap-in-region-tags
(make-header (list (make-header-entry RPMSIGTAG_SHA256 1 header-sha256)
(make-header-entry size-tag 1
header+compressed-payload-size)
;; (make-header-entry RPMSIGTAG_PAYLOADSIZE 1
;; uncompressed-payload-size)
;; Reserve 32 bytes of extra space in case users would
;; like to add signatures, as done in rpmGenerateSignature.
(make-header-entry RPMSIGTAG_RESERVEDSPACE 32
(make-list 32 0))))
RPMTAG_HEADERSIGNATURES))
(define (assemble-rpm-metadata lead signature header)
"Align and append the various u8 list components together, and return the
result as a bytevector."
(let* ((offset (+ (length lead) (length signature)))
(header-offset (next-aligned-offset offset 8))
(padding (make-list (- header-offset offset) 0)))
;; The Header is 8-bytes aligned.
(u8-list->bytevector (append lead signature padding header))))
