bug: spack install from yaml fails #15219
Description
I am still seeing the issue using spack install --only dependencies <pkg> . For example, try this in Docker image spack/ubuntu-bionic:
spack mirror add e4s https://instinct.nic.uoregon.edu:8083/e4s
spack spec -y py-ptyprocess > py-ptyprocess.spec.yaml
spack install --cache-only --only dependencies ./py-ptyprocess.spec.yaml
Output (truncated to only show final error):
==> Error: Detected uninstalled dependencies for diffutils: {'libiconv'}
==> Error: Cannot proceed with diffutils: 1 uninstalled dependency: libiconv
The KEY is that libiconv IS INSTALLED, despite the above error message:
$> spack find libiconv
--- linux-ubuntu18.04-x86_64 / [email protected] --------------
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Originally posted by @eugeneswalker in #15197 (comment)