Multiline commands have two spaces in front: breaks heredocs

Travis CI Discussions & Feedback
1

I’d like to use heredocs to populate config files: e.g. something like:

cat > file << EOF
foo
bar
EOF

However something in travis adds two space in front of commands, that’s visible from a simple script I made, sed replaces the first character on each line:

- |
  sed 's/./x/' << EOF
  first line
  second line
  EOF

However the first character is somewhere else:

Screenshot%20from%202019-03-22%2002-40-35

This is very annoying bug, which prevents me from using multiline literals

2

Could you give a complete configuration and the build that exhibits the problem? This seems to behave correctly to me.

yields https://travis-ci.org/BanzaiMan/travis_production_test/builds/509729392#L463-L469

$ sed 's/./x/' << EOF
first line
second line
EOF

xirst line
xecond line
3

The original job failing is https://travis-ci.org/haskell-servant/servant/jobs/509699540 cat > $CABALHOME/config << EOF; and https://travis-ci.org/haskell-servant/servant/jobs/509708016 where I tried sed. Maybe it works in script but not in before_install / install ?

4

As curious as it sounds, I confirmed this to be the case. We are adding indentations (with white spaces) in certain parts of the build script we compile, and commands sensitive to such modifications are affected.

For complex use cases such as this (and when you have many commands in a build phase), I encourage you to write a script to handle them instead.

5

Is this extra indentation necessary? I guess it’s handy for eye-checking the generated script, but bash doesn’t care, right?

This is really surprising behaviour. I’ve hit this yesterday. At first I suspected my (lack of) understanding of YAML block literals, then Travis’ YAML parser, but it was always two spaces regardless of the indent in YAML, so it couldn’t be the parser guessing the indent incorrectly.

I think this could be fixed, if the extra indent is to be retained, by indenting the command-line as it comes from to_bash as a whole; instead of splitting it on newlines, indenting each one and joining them back together.

6

Just encountered this. Seems like a bug in travis. Can those extra spaces be removed?