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#!/bin/bash
#
# Copyright (C) 2026 Danilo M. <danix@danix.xyz>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program 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.
#
# The user's details, read and written where other programs look for them.
#
# userctl get key=value: name email avatar language location signingkey
# userctl keys fingerprint<TAB>uid per gpg secret key
# userctl set <key> <val> write one field to every store holding it
#
# Stores: AccountsService (and through SetRealName the passwd GECOS that
# LibreOffice reads), KDE's ~/.config/emaildefaults, the global git config.
# Polkit lets a user change their own AccountsService entry without a prompt.
#
# set prints nothing on success. On a failing write it prints the command and
# its error on stdout, for the drawer page, and exits 1 without trying the
# remaining stores. A new field is one case below and one entry in the
# page's field list.
set -u
# Character-wise ${x:0:1}, so an accented initial is not cut in half.
export LC_ALL=C.UTF-8
ACC=org.freedesktop.Accounts
OBJ="/org/freedesktop/Accounts/User$(id -u)"
IFACE=org.freedesktop.Accounts.User
usage() {
printf 'usage: %s get | keys | set <name|email|avatar|language|location|signingkey> <value>\n' \
"${0##*/}" >&2
exit 2
}
run() {
local err
if ! err="$("$@" 2>&1 >/dev/null)"; then
printf '%s: %s\n' "$1" "${err:-failed}"
exit 1
fi
}
# --json, because plain get-property prints non-ASCII as octal escapes.
# Fails with the first line of stderr as its output, so get can report it.
prop() {
local out
out="$(busctl --system --json=short get-property "$ACC" "$OBJ" "$IFACE" "$1" 2>&1)" \
|| { head -n1 <<< "${out:-failed}"; return 1; }
jq -r .data <<< "$out"
}
acc() { run busctl --system call -- "$ACC" "$OBJ" "$IFACE" "$1" s "$2"; }
kde() { run kwriteconfig6 --file emaildefaults --group PROFILE_Default --key "$1" -- "$2"; }
# The surname as an initial, for commits: "Jane Doèr" -> "Jane D.".
gitname() {
local -a w
read -ra w <<< "$1"
local n=${#w[@]}
if (( n < 2 )); then printf '%s' "${w[*]}"; return; fi
printf '%s %s.' "${w[*]:0:n-1}" "${w[n-1]:0:1}"
}
[[ $# -ge 1 ]] || usage
case "$1" in
get)
out=
# Read everything first: one error line and exit 1, never blank fields.
for p in RealName:name Email:email IconFile:avatar Language:language Location:location; do
val="$(prop "${p%%:*}")" || { printf 'error=%s\n' "$val"; exit 1; }
out+="${p#*:}=$val"$'\n'
done
printf '%s' "$out"
printf 'signingkey=%s\n' "$(git config --global --get user.signingkey)"
;;
keys)
# The first fpr after a sec is the primary key's; the first uid
# after that names it. ssb fingerprints come later and are skipped.
gpg --list-secret-keys --with-colons 2>/dev/null | awk -F: '
$1 == "sec" { want = ($2 !~ /^[rei]$/ && $12 ~ /S/) ? 1 : 0; next }
$1 == "fpr" && want == 1 { fpr = $10; want = 2; next }
$1 == "uid" && want == 2 && $2 !~ /^[re]$/ { print fpr "\t" $10; want = 0 }'
;;
set)
[[ $# -eq 3 ]] || usage
v="$3"
case "$2" in
name)
acc SetRealName "$v"
kde FullName "$v"
run git config --global user.name "$(gitname "$v")"
;;
email)
acc SetEmail "$v"
kde EmailAddress "$v"
run git config --global user.email "$v"
;;
avatar) acc SetIconFile "$v" ;;
language) acc SetLanguage "$v" ;;
location) acc SetLocation "$v" ;;
signingkey)
if [[ -n "$v" ]]; then
run git config --global user.signingkey "$v"
elif git config --global --get user.signingkey >/dev/null; then
run git config --global --unset-all user.signingkey
fi
;;
*) usage ;;
esac
;;
*) usage ;;
esac
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