Reduce image size

[nicoulaj]

The image size is pretty big (310MB). It can be reduced by uninstalling the compile-time only dependencies after build.

[nicoulaj]

Status:

• Images are now squashed (size is only reduced from 310MB to 290MB on current master) => merged on master
• the alpine-linux branch moves from Debian to Alpine Linux as the base image. The image size is reduced from 310MB to 15MB with squashing => not merged on master, as zsh test suite does not seem to work well with busybox instead of GNU coreutils (see this build)

[nicoulaj]

Status:

• On master the image size has been reduced from 310MB to 78MB by removing build dependencies and squashing.
• the alpine-linux branch moves from Debian to Alpine Linux as the base image. The image size is reduced to 15MB => not merged on master, as zsh test suite does not seem to work well with busybox/musl instead of GNU libc/coreutils (see this build)

[danielshahaf]

zsh test suite does not seem to work well with busybox/musl instead of GNU libc/coreutils (see this build)

D03 fails because the diff tool on alpine is not POSIX compliant. See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/diff.html#tag_20_34_10_03 (output form when invoked with two file operands).

[nicoulaj]

Yes, this one could be fixed easily by installing diffutils.

The remaining failures are:

Test ./V09datetime.ztst failed: bad status 1, expected 0 from:
  [[ $(strftime '%@' 0 2> /dev/null) == (%|)@ || $? != 0 ]]

=> looks like musl's strftime() does not implement some extensions, and the test handles it incorrectly

./A01grammar.ztst: starting.
Test ./A01grammar.ztst failed: bad status 127, expected 0 from:
  (exec -a /bin/SPLATTER /bin/sh -c 'echo $0')
Error output:
SPLATTER: applet not found
Was testing: `exec' with -a option
./A01grammar.ztst: test failed.

=> not sure what happens here

[danielshahaf]

``` ./A01grammar.ztst: starting. Test ./A01grammar.ztst failed: bad status 127, expected 0 from: (exec -a /bin/SPLATTER /bin/sh -c 'echo $0') Error output: SPLATTER: applet not found Was testing: `exec' with -a option ./A01grammar.ztst: test failed. ``` => not sure what happens here

Does /etc/zshenv define a function called 'exec'?

[nicoulaj]

No, /etc/zshenv does not exist.

[danielshahaf]

No, `/etc/zshenv` does not exist.

Thanks for checking. How about trying to reproduce the problem minimally: python -c 'import os; os.execv("/bin/sh", ["/bin/SPLATTER", "-c", "echo $0"])' Does that print "/bin/SPLATTER" or an error message?

[nicoulaj]

Step 20/27 : RUN python -c 'import os; os.execv("/bin/sh", ["/bin/SPLATTER", "-c", "echo $0"])'
 ---> Running in 256cd4bca283
SPLATTER: applet not found
The command '/bin/sh -c python -c 'import os; os.execv("/bin/sh", ["/bin/SPLATTER", "-c", "echo $0"])'' returned a non-zero code: 127

From a quick look at busybox docs, it seems it refers to core utilities as "applets" (and may be considers /bin as a special path). The exit code 127 might be incorrectly handled by the test.

[nicoulaj]

Image size is down to 25MB thanks to multi-stage build + minideb.