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make scw-fetch-ssh-keys atomic #226

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make scw-fetch-ssh-keys atomic #226

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15 changes: 9 additions & 6 deletions bases/overlay-common/usr/local/sbin/scw-fetch-ssh-keys
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ if [ "$1" = "--upgrade" ]; then
/usr/local/bin/scw-metadata > /dev/null
fi

cat << EOF > /root/.ssh/authorized_keys
cat << EOF > /root/.ssh/authorized_keys.new
#
# WARNING: Automatically generated file
# This file will be erased at every boot
Expand All @@ -38,18 +38,21 @@ cat << EOF > /root/.ssh/authorized_keys
EOF

# add Scaleway account keys
/usr/local/bin/scw-metadata --cached | grep SSH_PUBLIC_KEYS_.*_KEY | cut -d'=' -f 2- | tr -d \' >> /root/.ssh/authorized_keys
/usr/local/bin/scw-metadata --cached | grep 'SSH_PUBLIC_KEYS_.*_KEY' | cut -d'=' -f 2- | tr -d \' >> /root/.ssh/authorized_keys.new

# add Server tags keys
/usr/local/bin/scw-metadata --cached | grep TAGS_.*=AUTHORIZED_KEY | cut -d'=' -f 3- | sed 's/_/\ /g' >> /root/.ssh/authorized_keys
/usr/local/bin/scw-metadata --cached | grep 'TAGS_.*=AUTHORIZED_KEY' | cut -d'=' -f 3- | sed 's/_/\ /g' >> /root/.ssh/authorized_keys.new

# Import custom keys
if [ -f /root/.ssh/instance_keys ]; then
cat << EOF >> /root/.ssh/authorized_keys
cat << EOF >> /root/.ssh/authorized_keys.new
# Below your custom ssh keys from '/root/.ssh/instance_keys'
EOF
(cat /root/.ssh/instance_keys | grep -v "^#" || true) >> /root/.ssh/authorized_keys
(cat /root/.ssh/instance_keys | grep -v "^#" || true) >> /root/.ssh/authorized_keys.new
fi

# authorized_keys should only be readable by the owner and no one else
chmod 0600 /root/.ssh/authorized_keys
chmod 0600 /root/.ssh/authorized_keys.new

# replace the existing file automatically
mv /root/.ssh/authorized_keys.new /root/.ssh/authorized_keys