siegfried

README

Siegfried

Siegfried is a signature-based file format identification tool, implementing:

• the National Archives UK's PRONOM file format signatures
• freedesktop.org's MIME-info file format signatures
• the Library of Congress's FDD file format signatures (beta).
• Wikidata (beta).

Version

1.11.1

Usage

Command line

sf file.ext
sf *.ext
sf DIR

Options

sf -csv file.ext | *.ext | DIR             // Output CSV rather than YAML
sf -json file.ext | *.ext | DIR            // Output JSON rather than YAML
sf -droid file.ext | *.ext | DIR           // Output DROID CSV rather than YAML
sf -nr DIR                                 // Don't scan subdirectories
sf -z file.zip | *.ext | DIR               // Decompress and scan zip, tar, gzip, warc, arc
sf -zs gzip,tar file.tar.gz | *.ext | DIR  // Selectively decompress and scan 
sf -hash md5 file.ext | *.ext | DIR        // Calculate md5, sha1, sha256, sha512, or crc hash
sf -sig custom.sig *.ext | DIR             // Use a custom signature file
sf -                                       // Scan stream piped to stdin
sf -name file.ext -                        // Provide filename when scanning stream 
sf -f myfiles.txt                          // Scan list of files and directories
sf -v | -version                           // Display version information
sf -home c:\junk -sig custom.sig file.ext  // Use a custom home directory
sf -serve hostname:port                    // Server mode
sf -throttle 10ms DIR                      // Pause for duration (e.g. 1s) between file scans
sf -multi 256 DIR                          // Scan multiple (e.g. 256) files in parallel 
sf -log [comma-sep opts] file.ext          // Log errors etc. to stderr (default) or stdout
sf -log e,w file.ext | *.ext | DIR         // Log errors and warnings to stderr
sf -log u,o file.ext | *.ext | DIR         // Log unknowns to stdout
sf -log d,s file.ext | *.ext | DIR         // Log debugging and slow messages to stderr
sf -log p,t DIR > results.yaml             // Log progress and time while redirecting results
sf -log fmt/1,c DIR > results.yaml         // Log instances of fmt/1 and chart results
sf -replay -log u -csv results.yaml        // Replay results file, convert to csv, log unknowns
sf -setconf -multi 32 -hash sha1           // Save flag defaults in a config file
sf -setconf -serve :5138 -conf srv.conf    // Save/load named config file with '-conf filename' 

Example

Signature files

By default, siegfried uses the latest PRONOM signatures without buffer limits (i.e. it may do full file scans). To use MIME-info or LOC signatures, or to add buffer limits or other customisations, use the roy tool to build your own signature file.

Install

With go installed:

go install github.com/richardlehane/siegfried/cmd/sf@latest

sf -update

Or, without go installed:

Win:

Download a pre-built binary from the releases page. Unzip to a location in your system path. Then run:

sf -update

Mac Homebrew (or Linuxbrew):

brew install mistydemeo/digipres/siegfried

Or, for the most recent updates, you can install from this fork:

brew install richardlehane/digipres/siegfried

Ubuntu/Debian (64 bit):

curl -sL "http://keyserver.ubuntu.com/pks/lookup?op=get&search=0x20F802FE798E6857" | gpg --dearmor | sudo tee /usr/share/keyrings/siegfried-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/siegfried-archive-keyring.gpg] https://www.itforarchivists.com/ buster main" | sudo tee -a /etc/apt/sources.list.d/siegfried.list
sudo apt-get update && sudo apt-get install siegfried

FreeBSD:

pkg install siegfried

Arch Linux:

git clone https://aur.archlinux.org/siegfried.git
cd siegfried
makepkg -si

Changes

v1.11.1 (2023-12-16)

Added

• glob-matching for container signatures; see digital-preservation/pronom#10
• sf -update works for older versions of siegfried; see #231

Changed

• default location for siegfried HOME now follows XDG Base Directory Specification; see #216. Implemented by Bernhard Hampel-Waffenthal
• siegfried prints version before erroring with failed signature load; requested by Ross Spencer
• update PRONOM to v116
• update LOC to 2023-12-14
• update tika-mimetypes to v3.0.0-BETA
• update freedesktop.org to v2.4

Fixed

• panic on malformed zip file during container matching; reported by James Mooney

v1.10.1 (2023-04-24)

Fixed

• glob expansion now only on Windows & when no explicit path match. Implemented by Bernhard Hampel-Waffenthal
• compression algorithm for debian packages changed back to xz. Implemented by Paul Millar
• -multi droid setting returned empty results when priority lists contained self-references. See #218
• CGO disabled for debian package and linux binaries. See #219

v1.10.0 (2023-03-25)

Added

• format classification included as "class" field in PRONOM results. Requested by Robin François. Implemented by Ross Spencer
• -noclass flag added to roy build command. Use this flag to build signatures that omit the new "class" field from results.
• glob paths can be used in place of file or directory paths for identification (e.g. sf *.jpg). Implemented by Ross Spencer
• -multi droid setting for roy build command. Applies priorities after rather than during identification for more DROID-like results. Reported by David Clipsham
• /update command for server mode. Requested by Luis Faria

Changed

• new algorithm for dynamic multi-sequence matching for improved wildcard performance
• update PRONOM to v111
• update LOC to 2023-01-27
• update tika-mimetypes to v2.7.0
• minimum go version to build siegfried is now 1.18

Fixed

• archivematica extensions built into wikidata signatures. Reported by Ross Spencer
• trailing slash for folder paths in URI field in droid output. Reported by Philipp Wittwer
• crash when using sf -replay with droid output

See the CHANGELOG for the full history.

Rights

Copyright 2024 Richard Lehane, Ross Spencer

Licensed under the Apache License, Version 2.0

Announcements

Join the Google Group for updates, signature releases, and help.

Contributing

Like siegfried and want to get involved in its development? That'd be wonderful! There are some notes on the wiki to get you started, and please get in touch.

Thanks

Thanks TNA for http://www.nationalarchives.gov.uk/pronom/ and http://www.nationalarchives.gov.uk/information-management/projects-and-work/droid.htm

Thanks Ross for https://github.com/exponential-decay/skeleton-test-suite-generator and http://exponentialdecay.co.uk/sd/index.htm, both are very handy!

Thanks Misty for the brew and ubuntu packaging

Thanks Steffen for the FreeBSD and Arch Linux packaging

Documentation

Overview

Package siegfried identifies file formats

Example:

s, err := siegfried.Load("pronom.sig")
if err != nil {
	log.Fatal(err)
}
f, err := os.Open("file")
if err != nil {
	log.Fatal(err)
}
defer f.Close()
ids, err := s.Identify(f, "filename.ext", "application/xml")
if err != nil {
	log.Fatal(err)
}
for _, id := range ids {
	fmt.Println(id)
}

Index

• type Siegfried
  • func Load(path string) (*Siegfried, error)
  • func LoadReader(r io.Reader) (*Siegfried, error)
  • func New() *Siegfried
  • func (s *Siegfried) Add(i core.Identifier) error
  • func (s *Siegfried) Blame(idx, ct int, cn string) string
  • func (s *Siegfried) Buffer(r io.Reader) (*siegreader.Buffer, error)
  • func (s *Siegfried) Fields() [][]string
  • func (s *Siegfried) Identifiers() [][2]string
  • func (s *Siegfried) Identify(r io.Reader, name, mime string) ([]core.Identification, error)
  • func (s *Siegfried) IdentifyBuffer(buffer *siegreader.Buffer, err error, name, mime string) ([]core.Identification, error)
  • func (s *Siegfried) Inspect(t core.MatcherType) string
  • func (s *Siegfried) Label(id core.Identification) [][2]string
  • func (s *Siegfried) Put(buffer *siegreader.Buffer)
  • func (s *Siegfried) Save(path string) error
  • func (s *Siegfried) SaveWriter(w io.Writer) error

Types

type Siegfried

type Siegfried struct {
	// immutable fields
	C time.Time // signature create time
	// contains filtered or unexported fields
}

Siegfried structs are persisent objects that can be serialised to disk and used to identify file formats. They contain three matchers as well as a slice of identifiers. When identifiers are added to a Siegfried struct, they are registered with each matcher.

func Load

func Load(path string) (*Siegfried, error)

Load creates a Siegfried struct and loads content from path

func LoadReader

func LoadReader(r io.Reader) (*Siegfried, error)

LoadReader creates a Siegfried struct and loads content from a reader

func New

func New() *Siegfried

New creates a new Siegfried struct. It initializes the three matchers.

Example:

s := New()
p, err := pronom.New() // create a new PRONOM identifier
if err != nil {
	log.Fatal(err)
}
err = s.Add(p) // add the identifier to the Siegfried
if err != nil {
	log.Fatal(err)
}
err = s.Save("pronom.sig") // save the Siegfried

func (*Siegfried) Add

func (s *Siegfried) Add(i core.Identifier) error

Add adds an identifier to a Siegfried struct.

func (*Siegfried) Blame

func (s *Siegfried) Blame(idx, ct int, cn string) string

Blame checks with the byte matcher to see what identification results subscribe to a particular result or test tree index. It can be used when identifying in a debug mode to check which identification results trigger which strikes.

func (*Siegfried) Buffer

func (s *Siegfried) Buffer(r io.Reader) (*siegreader.Buffer, error)

Buffer gets a siegreader buffer from the pool

func (*Siegfried) Fields

func (s *Siegfried) Fields() [][]string

Fields returns a slice of the names of the fields in each identifier.

func (*Siegfried) Identifiers

func (s *Siegfried) Identifiers() [][2]string

Identifiers returns a slice of the names and details of each identifier.

func (*Siegfried) Identify

func (s *Siegfried) Identify(r io.Reader, name, mime string) ([]core.Identification, error)

Identify identifies a stream or file object. It takes an io.Reader and the name and mimetype of the file/stream (if unknown, give empty strings). It returns a slice of identifications and an error.

func (*Siegfried) IdentifyBuffer

func (s *Siegfried) IdentifyBuffer(buffer *siegreader.Buffer, err error, name, mime string) ([]core.Identification, error)

IdentifyBuffer identifies a siegreader buffer. Supply the error from Get as the second argument.

func (*Siegfried) Inspect

func (s *Siegfried) Inspect(t core.MatcherType) string

Inspect returns a string containing detail about the various matchers in the Siegfried struct.

func (*Siegfried) Label

func (s *Siegfried) Label(id core.Identification) [][2]string

Label takes the values of a core.Identification and returns a slice that pairs these values with the relevant identifier's field labels.

func (*Siegfried) Put

func (s *Siegfried) Put(buffer *siegreader.Buffer)

Put returns a siegreader buffer to the pool

func (*Siegfried) Save

func (s *Siegfried) Save(path string) error

Save persists a Siegfried struct to disk (path)

func (*Siegfried) SaveWriter

func (s *Siegfried) SaveWriter(w io.Writer) error

SaveWriter persists a Siegfried struct to an io.Writer