Argument error in parse_version

[angelikatyborska]

In the official Docker image postgres:10.2, my Ecto application failes to start or execute any mix task due to an argument error:

$ mix ecto.drop
15:56:25.597 [error] GenServer #PID<0.288.0> terminating
** (ArgumentError) argument error
    (postgrex) lib/postgrex/utils.ex:69: anonymous fn/1 in Postgrex.Utils.parse_version/1
    (elixir) lib/enum.ex:1294: Enum."-map/2-lists^map/1-0-"/2
    (elixir) lib/enum.ex:1294: Enum."-map/2-lists^map/1-0-"/2
    (postgrex) lib/postgrex/utils.ex:69: Postgrex.Utils.parse_version/1
    (postgrex) lib/postgrex/protocol.ex:642: Postgrex.Protocol.bootstrap_send/6
    (postgrex) lib/postgrex/protocol.ex:475: Postgrex.Protocol.handshake/2
    (db_connection) lib/db_connection/connection.ex:134: DBConnection.Connection.connect/2
    (connection) lib/connection.ex:622: Connection.enter_connect/5
    (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3
Last message: nil
State: Postgrex.Protocol
** (Mix) The database for Schemas.Repo couldn't be dropped: an exception was raised:
    ** (ArgumentError) argument error
        (postgrex) lib/postgrex/utils.ex:69: anonymous fn/1 in Postgrex.Utils.parse_version/1
        (elixir) lib/enum.ex:1294: Enum."-map/2-lists^map/1-0-"/2
        (elixir) lib/enum.ex:1294: Enum."-map/2-lists^map/1-0-"/2
        (postgrex) lib/postgrex/utils.ex:69: Postgrex.Utils.parse_version/1
        (postgrex) lib/postgrex/protocol.ex:642: Postgrex.Protocol.bootstrap_send/6
        (postgrex) lib/postgrex/protocol.ex:475: Postgrex.Protocol.handshake/2
        (db_connection) lib/db_connection/connection.ex:134: DBConnection.Connection.connect/2
        (connection) lib/connection.ex:622: Connection.enter_connect/5
        (stdlib) proc_lib.erl:247: :proc_lib.init_p_do_apply/3

I have checked that the string that Postgrex.Utils.parse_version tries to parse is "10.2 (Debian 10.2-1.pgdg90+1)".

I also noticed this difference between the new and some older PostgreSQL Docker images:

$ docker run -ti postgres:9.5.10 /bin/sh
# psql --version
psql (PostgreSQL) 9.5.10

$ docker run -ti postgres:10 /bin/sh
# psql --version
psql (PostgreSQL) 10.2 (Debian 10.2-1.pgdg90+1)

[josevalim]

HI @angelikatyborska! We have just backported a fix for this in the v0.13 branch, can you try it out for now and let us know how it goes? Thank you!

[angelikatyborska]

Oh, I did not notice that! I only looked through open and closed issues.

Yes, I confirm that the fix on branch v0.13 works for me.

 defp deps do
    [
      {:ecto, "~> 2.0"},
      {:postgrex, git: "https://github.com/elixir-ecto/postgrex", branch: "v0.13", override: true},
      # ...
    ]
  end

👍

[kulshekhar]

Ran into this issue an hour ago and can confirm this fix worked for me as well.

Some additional info in case it helps - the setup worked fine without the fix but broke after my system received upgrades for Postgres (among others)

[josevalim]

Since many people are running into this I will ship a new version still today. :)

[josevalim]

Done!