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Filename : applygnupgdefaults
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#!/bin/sh
# Apply defaults from /etc/gnupg/gpgconf.conf to all users       -*- sh -*-
#
# Copyright 2007 Free Software Foundation, Inc.
#
# This file is free software; as a special exception the author gives
# unlimited permission to copy and/or distribute it, with or without
# modifications, as long as this notice is preserved.
#
# This file is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

PGM=applygnupgdefaults
errorfile=

error () {
  echo "$PGM: $*" >&2
  [ -n "$errorfile" ] && echo "$PGM: $*" >>$errorfile
}

info () {
  echo "$PGM: $*" >&2
}

if [ -n "$1" ]; then
    echo "usage: $PGM" >&2
    exit 1
fi

# Cleanup on exit
cleanup ()
{
    [ -n "$errorfile" -a -f "$errorfile" ] && rm "$errorfile"
}
trap cleanup EXIT SIGINT SIGHUP SIGPIPE
errorfile=$(mktemp "/tmp/$PGM.log.XXXXXX")
[ -n "$errorfile" -a -f "$errorfile" ] || exit 2

# Check whether we can use getent
if getent --help </dev/null >/dev/null 2>&1 ; then
    cat_passwd='getent passwd'
else
    cat_passwd='cat /etc/passwd'
    info "please note that only users from /etc/passwd are processed"
fi

if [ ! -f /etc/gnupg/gpgconf.conf ]; then
    error "global configuration file \`/etc/gnupg/gpgconf.conf' does not exist"
    exit 1
fi
if [ ! -f /etc/shells ]; then
    error "missing file \`/etc/shells'"
    exit 1
fi

if [ $(id -u) -ne 0 ]; then
    error "needs to be run as root"
    exit 1
fi

${cat_passwd} \
  | while IFS=: read -r user dmy_a uid dmy_c dmy_d home shell dmy_rest; do
    # Process only entries with a valid login shell
    grep </etc/shells "^$shell" 2>/dev/null >/dev/null || continue
    # and with an pre-existing gnupg home directory
    [ -d "$home/.gnupg" ] || continue
    # but not root
    [ "${uid:-0}" -eq 0 ] && continue
    info "running \"gpgconf --apply-defaults\" for $user"
    if su -l -s /bin/sh \
       -c 'gpgconf --apply-defaults && echo SUCCESS' $user \
       | tail -1 | grep ^SUCCESS >/dev/null ; then
      :
    else
      error "failed to update gnupg defaults for $user"
    fi
done

[ "$(wc -c <$errorfile)" -gt 0 ] && exit 1
exit 0