[SOLVED] Why "bash <(wget -qO- https://example.com)" does not work used with docker's RUN command? But works both from host or container used manually?

Issue

I've create a simple vim distro and I install it manually in my local computer or inside a docker using a command like the following:

bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh)

This script works. But I want to execute it also inside a Dockerfile. Trying to simply add:

 RUN bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh)

I got

 => ERROR [ 9/10] RUN bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh)                                                          0.3s
------
 > [ 9/10] RUN bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh):
#12 0.321 /bin/sh: 1: Syntax error: "(" unexpected
------
executor failed running [/bin/sh -c bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh)]: exit code: 2
ERROR: Service 'php' failed to build : Build failed
make: *** [recreate] Error 1

Then I though to add \ before (.

 RUN bash <\(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh\)

The new error is

 => ERROR [ 9/10] RUN bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh)                                                          0.3s
------
 > [ 9/10] RUN bash <(wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh):
#12 0.310 /bin/sh: 1: cannot open (wget: No such file

Other question (and answer) in stackoverflow does not helping me.

Solution

RUN executes the command using sh, but process substitution with <( is a bash extension.

Use an ordinary pipe

RUN wget -qO- https://raw.githubusercontent.com/sensorario/newdots/master/install.sh | bash

Answered By - Barmar