Add testutils generate-synthetic-upgrade

[cgwalters]

We want to test upgrades that actually change files as a general
rule; in some cases we want to test "large" upgrades to validate
performance.

This code generates a "synthetic" upgrade that adds an ELF note
to a percentage of ELF files (randomly selected). By doing
it this way we are only actually testing one version of the code.

Migrated from coreos/coreos-assembler#1635
using the Rust code from ostreedev/ostree#2127

[cgwalters]

I only compile tested this locally because I forgot how to run the old vmcheck tests using fcos.

[jlebon]

I only compile tested this locally because I forgot how to run the old vmcheck tests using fcos.

Once you have a qcow2, you can just do ln -sf /path/to/my.qcow2 tests/vmcheck/image.qcow2 then run tests/vmcheck.sh.

[cgwalters]

Once you have a qcow2, you can just do ln -sf /path/to/my.qcow2 tests/vmcheck/image.qcow2 then run tests/vmcheck.sh.

Yep I reread the .cci.jenkinsfile for that. We need to streamline/standardize this workflow with cosa build-fast etc.

[cgwalters]

Got a passed run with env TESTS=upgrades ./tests/vmcheck.sh with this.

[jlebon]

Very cool!
/lgtm

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[cgwalters]

One important thing I forgot to mention is that by doing this we can't use objcopy anymore, which gets into coreos/coreos-assembler#1645