az cli install script fails for alpine

[pragyamehta]

Running the az cli install script inside Alpine docker image fails with multiple errors

To Reproduce
use the below Dockerfile

FROM alpine:3.7
RUN apk add --update --no-cache bash python3 libffi openssl curl
RUN ln -s /usr/bin/python3 /usr/bin/python
RUN curl -L https://aka.ms/InstallAzureCli | bash

Expected behavior
Image is successfully built and container has az installed in it

Environment summary
Docker on windows
docker version
Client:
Version: 18.06.1-ce
API version: 1.38
Go version: go1.10.3
Git commit: e68fc7a
Built: Tue Aug 21 17:21:34 2018
OS/Arch: windows/amd64
Experimental: false

Server:
Engine:
Version: 18.06.1-ce
API version: 1.38 (minimum version 1.12)
Go version: go1.10.3
Git commit: e68fc7a
Built: Tue Aug 21 17:29:02 2018
OS/Arch: linux/amd64
Experimental: false

Additional context
I see the below errors :

1. mktemp expects a template that ends with XXXXXX and not XXXX
2. If I manually edit the script and run, I see the error "./install-azure-cli.sh: line 33: /dev/tty: No such device or address"
3. If I manually run the install script inside the container without "< /dev/tty", I get the error :
   Command "/root/lib/azure-cli/bin/python -m pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-m1zf6io_ --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools wheel "cffi>=1.4.1; python_implementation != 'PyPy'"" failed with error code 1 in None
   Traceback (most recent call last):
   File "./azure_cli_install_tmp_PeaOmb", line 370, in
   main()
   File "./azure_cli_install_tmp_PeaOmb", line 356, in main
   install_cli(install_dir, tmp_dir)
   File "./azure_cli_install_tmp_PeaOmb", line 140, in install_cli
   exec_command(cmd)
   File "./azure_cli_install_tmp_PeaOmb", line 100, in exec_command
   subprocess.check_call(command_list, cwd=cwd, env=env)
   File "/usr/lib/python3.6/subprocess.py", line 291, in check_call
   raise CalledProcessError(retcode, cmd)
   subprocess.CalledProcessError: Command '['/root/lib/azure-cli/bin/pip', 'install', '--cache-dir', '/tmp/tmputs58c2j', 'azure-cli', '--upgrade']' returned non-zero exit status 1.

[yugangw-msft]

CC: @troydai
I don't believe install-azure-cli.sh is supported any more for linux.
You best option is to follow the docker file

[mrumpf]

The fix is just to make the "XXXX" longer by 2 "X" :)
The alpine mktemp expects the TEMPLATE to have 6x"X": "XXXXXX":

BusyBox v1.28.4 (2018-07-17 15:21:40 UTC) multi-call binary.

Usage: mktemp [-dt] [-p DIR] [TEMPLATE]

Create a temporary file with name based on TEMPLATE and print its name.
TEMPLATE must end with XXXXXX (e.g. [/dir/]nameXXXXXX).
Without TEMPLATE, -t tmp.XXXXXX is assumed.

	-d	Make directory, not file
	-q	Fail silently on errors
	-t	Prepend base directory name to TEMPLATE
	-p DIR	Use DIR as a base directory (implies -t)
	-u	Do not create anything; print a name

Base directory is: -p DIR, else $TMPDIR, else /tmp

[mrumpf]

So the fix is like this:

curl -L https://aka.ms/InstallAzureCli | sed -e "s/XXXX/XXXXXX/g" | bash