matrix-docker-ansible-deploy/roles/matrix-synapse/templates/synapse/usr-local-bin/matrix-synapse-generate-password-hash.j2

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#!/usr/bin/env expect
# Read the password string
set pass [lindex $argv 0]
# Check if password was provided
if { $pass == "" } {
puts "Usage: $argv0 <password>"
exit 1
}
# Disable output
log_user 0
# Execute password hashing script
spawn docker exec -it matrix-synapse /usr/local/bin/hash_password -c /data/homeserver.yaml
expect "Password: "
send "$pass\r"
expect "Confirm password: "
send "$pass\r"
expect "%"
# Save the hash output to a variable
set output $expect_out(buffer)
# Trim the whitespace
regexp {\S+} $output passwordHash
# Output the password hash
puts -nonewline stdout $passwordHash
close stdout