Install fails on Ubuntu 18.04 and 18.10

[sabrehagen]

I'm finding the oh-my-zsh install script fails with exit 1 and no error message when installing on ubuntu:18.04 and ubuntu:18.10.

FROM ubuntu:18.10
ENV TERM screen-256color

RUN apt update && apt install -y curl zsh git

RUN sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"

docker build -t ubuntu-zsh .
...
Cloning into '/root/.oh-my-zsh'...
Looking for an existing zsh config...
Using the Oh My Zsh template file and adding it to ~/.zshrc
The command '/bin/sh -c sh -c "$(curl -fsSL https://raw.githubusercontent.com/robbyrussell/oh-my-zsh/master/tools/install.sh)"'
  returned a non-zero code: 1

---

I've added the command

ENV TERM screen-256color

which silences the following error:

tput: No value for $TERM and no -T specified

It appears to be non-fatal.

[sabrehagen]

By console logging I found out it's crashing on this line.

FROM ubuntu:18.10

RUN apt update
RUN apt install -y curl zsh git

RUN sh -c "$(curl -fsSL https://raw.githubusercontent.com/sabrehagen/oh-my-zsh/cabf1ef50dd10084d91c2c4e5386821f5bb1be79/tools/install.sh)"

docker build -t ubuntu-zsh .
...
Using the Oh My Zsh template file and adding it to ~/.zshrc
before
The command '/bin/sh -c sh -c "$(curl -fsSL https://raw.githubusercontent.com/sabrehagen/oh-my-zsh/cabf1ef50dd10084d91c2c4e5386821f5bb1be79/tools/install.sh)"'
   returned a non-zero code: 1

[mcornella]

Try with the following change to install.sh:

   # If this user's login shell is not already "zsh", attempt to switch.
-  TEST_CURRENT_SHELL=$(expr "$SHELL" : '.*/\(.*\)')
+  TEST_CURRENT_SHELL=$(basename "$SHELL")

[sabrehagen]

Yes, install succeeds with that change.