Signing Packages

[ rough draft ]

Have a GPG key

Create your new key: gpg --gen-key more... [ TBD: how strong should the key be? ]

Back it up: gpg --export-secret-keys --armor <keyid> > my_key_backup.asc more...

In case you need to import the backup later: gpg --import <backup_file>, gpg --edit-key <keyid> and trust it ultimately.

Export the public key: gpg --export --armor <keyid> > my_pub_key.asc

If you're going to use the key for GPG/MIME or share your signed packages with other people, you probably need publish your key: gpg --send-key <keyid> more...

Import into pacman

This is needed because pacman has its own keystore and own rules for trusting keys. Either you get approved as a packager for the MSYS2 project, or you have to import your key manually.

To import and sign your key with pacman-key:

pacman-key --add <pubkeyfile>, or if it's published pacman-key --recv-keys <keyid>
pacman-key --lsign-key <keyid> more...

To make your key a trusted developer key for signing official packages, you have to get your key included in the respective keyring and get it signed by at least 3 master keys. The package and repository is msys2-keyring for MSYS2, see Alexpux/msys2-keyring. The package and repository for Arch Linux is archlinux-keyring, see https://projects.archlinux.org/archlinux-keyring.git/. These packages install keyring files into /usr/share/pacman/keyrings which then can be imported and locally signed in one batch using pacman-key --populate <keyringname>.

Actually sign stuff

Old packages: gpg --detach-sign --no-armor <pkg> for each package (all such packages need to be re-repo-added to make the database aware of the new signatures)
New packages: just add --sign to makepkg command line or set the related makepkg.conf option
Databases: repo-add -s -v <db> <pkg>