Problem description

@jfaltenbacher reported that issue in our internal Slack channel. The daps command fails with the following error message:

$ daps -v -d DC-opensuse-gnome-user validate 
make: execvp: /bin/bash: Argument list too long
make: *** [/usr/share/daps/make/validate.mk:68: validate] Error 127

After further examination, it was a validation error. However, this error message was hidden behind the above bash line.

The first lines of the real error message looks like:

if [[ -n ".../SUSE/doc-sle/build/.profiled/x86_64_osuse/deployment_troubleshooting.xml:206:69: error: attribute "format" not allowed here; expected attribute "align", "annotations", ...
[... overly long line pruned ...]

@fsundermeyer Could you have a look?

Expected behavior

daps should report the validation error, not the bash line from above.

Steps to reproduce problem

1. Preparation of GeekoDoc v2.1.0:
   a. Clone the Geekodoc repository with git clone git@github.com:openSUSE/geekodoc.git
   b. Checkout tag v2.1.0: git checkout v2.1.0
   c. Install the build requirements: sudo zypper install python3-rnginline trang
   d. Build the Geekodoc schema with: ./build.sh. The schema can be found at dist/geekodoc/rng/2_5.2/geekodoc-v2-flat.rnc.
   e. Convert RNC to RNG: trang dist/geekodoc/rng/2_5.2/geekodoc-v2-flat.rnc dist/geekodoc/rng/2_5.2/geekodoc-v2-flat.rng
2. Edit ~/.config/daps/dapsrc and search for the DOCBOOK5_RNG_URI line. Add the path to the RNG(!) file and prefix it with file://.
3. Build the openSUSE Gnome User guide as mentioned above.

The funny thing is, you only get the full error message if you use -vvv or --debug.