Append a new public key to authorized_key. Useable with git-shell, (putted in git-shell-commands). Forked from http://planzero.org/blog/2012/10/24/hosting_an_admin-friendly_git_server_with_git-shell .

addkey

#!/bin/sh


# Read in the SSH key
echo "Input the key to be added:"
read key

# Place the key in a temporary file (it's hard to get ssh-keygen
# to read from stdin; <<< works for bash, but is non-posix)
keyfile=$(tempfile) &&\
echo "$key" > $keyfile

# Generate a fingerprint
fingerprint=$(ssh-keygen -lf $keyfile)

# Check for errors
if [ $(echo "$fingerprint" | egrep -c '(R|D)SA') -eq 0 ]
then

	# Display the fingerprint error and clean up
	echo "Error: $fingerprint"
	rm $keyfile
	exit 1

fi

# Add the key to the authorised keys file and clean up
mkdir -p .ssh &&\
echo -n "no-agent-forwarding,no-port-forwarding,no-X11-forwarding " >> .ssh/authorized_keys &&\
cat $keyfile >> .ssh/authorized_keys
rm $keyfile

# Display the fingerprint for reference
echo "Success! Added a key with the following fingerprint:"
echo $fingerprint