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.TH "MIGRATE-PUBRING-FROM-CLASSIC-GPG" 1 "April 2016"
.SH NAME
migrate\-pubring\-from\-classic\-gpg \- Migrate a public keyring from "classic" to "modern" GnuPG
.SH SYNOPSIS
.B migrate\-pubring\-from\-classic\-gpg
.RB "[ " GPGHOMEDIR " | "
.IR \-\-default " ]"
.SH DESCRIPTION
.B migrate\-pubring\-from\-classic\-gpg
migrates the public keyring in GnuPG home directory GPGHOMEDIR from
the "classic" keyring format (pubring.gpg) to the "modern" keybox format using GnuPG
versions 2.1 or 2.2 (pubring.kbx).
Specifying
.B \-\-default
selects the standard GnuPG home directory (looking at $GNUPGHOME
first, and falling back to ~/.gnupg if unset.
.SH OPTIONS
.BR \-h ", " \-\-help ", " \-\-usage
Output a short usage information.
.SH DIAGNOSTICS
The program sends quite a bit of text (perhaps too much) to stderr.
During a migration, the tool backs up several pieces of data in a
timestamped subdirectory of the GPGHOMEDIR.
.SH LIMITATIONS
The keybox format rejects a number of OpenPGP certificates that the
"classic" keyring format used to accept. These filters are defensive,
since the certificates rejected are unsafe -- either cryptographically
unsound, or dangerously non-performant. This means that some
migrations may produce warning messages about the migration being
incomplete. This is generally a good thing!
Known limitations:
.B Flooded certificates
.RS 4
Some OpenPGP certificates have been flooded with bogus certifications
as part of an attack on the SKS keyserver network (see
https://tools.ietf.org/html/draft-dkg-openpgp-abuse-resistant-keystore-03#section-2.1).
The keybox format rejects import of any OpenPGP certificate larger
than 5MiB. As of GnuPG 2.2.17, if gpg encounters such a flooded
certificate will retry the import while stripping all third-party
certifications (see "self-sigs-only" in gpg(1)).
The typical error message when migrating a keyring with a flooded
certificate will be something like:
.RE
.RS 8
error writing keyring 'pubring.kbx': Provided object is too large
.RE
.B OpenPGPv3 public keys (a.k.a. "PGP-2" keys)
.RS 4
Modern OpenPGP implementations use so-called "OpenPGP v4" public keys.
Older versions of the public key format have serious known problems.
See https://tools.ietf.org/html/rfc4880#section-5.5.2 for more details
about and reasons for v3 key deprecation.
The keybox format skips v3 keys entirely during migration, and GnuPG
will produce a message like:
.RE
.RS 8
skipped PGP-2 keys: 1
.RE
.SH ENVIRONMENT VARIABLES
.B GNUPGHOME
Selects the GnuPG home directory when set and --default is given.
.B GPG
The name of the
.B gpg
executable (defaults to
.B gpg
).
.SH SEE ALSO
.BR gpg (1)
.SH AUTHOR
Copyright (C) 2016 Daniel Kahn Gillmor for the Debian project. Please
report bugs via the Debian BTS.
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