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gpg --import YOUR_CODE_SIGNING_SECRET_KEY
 
echo > ~/.rpmmacros <<__EOT__
"%_gpg_name YOUR_CODE_SIGNING_KEY_ID
__EOT__

" > ~/.rpmmacros
yum install -y rpm-sign createrepo

cd /tmp
 
# Sign all RPM packages (This step required to input passphrase, so don't copy and paste the entire script here)
rpm --addsign `find centos-7 -name \*rpm`
 
# Recreate the metadata for repository
createrepo centos-7
 
# Armor the metadata
gpg --detach-sign --armor centos-7/repodata/repomd.xml