+ workingdir=$(mktemp -d ${TMPDIR:-/tmp}/tmp.XXXXXXXXXX)
+ umask 077
+ mkfifo "$workingdir/passphrase"
+ keysuccess=1
+
+ # FIXME: we're currently allowing any other options to get passed
+ # through to ssh-add. should we limit it to known ones? For
+ # example: -d or -c and/or -t <lifetime>
+
+ for subkey in $authsubkeys; do
+ # choose a label by which this key will be known in the agent:
+ # we are labelling the key by User ID instead of by
+ # fingerprint, but filtering out all / characters to make sure
+ # the filename is legit.
+
+ primaryuid=$(gpg --with-colons --list-key "0x${subkey}!" | grep '^pub:' | cut -f10 -d: | tr -d /)
+
+ #kname="[monkeysphere] $primaryuid"
+ kname="$primaryuid"
+
+ if [ "$1" = '-d' ]; then
+ # we're removing the subkey:
+ gpg --export "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname"
+ (cd "$workingdir" && ssh-add -d "$kname")
+ else
+ # we're adding the subkey:
+ mkfifo "$workingdir/$kname"
+ gpg --quiet --passphrase-fd 3 3<"$workingdir/passphrase" \
+ --export-options export-reset-subkey-passwd,export-minimal,no-export-attributes \
+ --export-secret-subkeys "0x${subkey}!" | openpgp2ssh "$subkey" > "$workingdir/$kname" &
+ (cd "$workingdir" && DISPLAY=nosuchdisplay SSH_ASKPASS=/bin/false ssh-add "$@" "$kname" </dev/null )&
+
+ passphrase_prompt "Enter passphrase for key $kname: " "$workingdir/passphrase"
+ wait %2
+ fi
+ keysuccess="$?"
+
+ rm -f "$workingdir/$kname"
+ done
+
+ rm -rf "$workingdir"
+
+ # FIXME: sort out the return values: we're just returning the
+ # success or failure of the final authentication subkey in this
+ # case. What if earlier ones failed?
+ exit "$keysuccess"
+}
+
+########################################################################
+# MAIN
+########################################################################