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Insert generated image.json into the ostree commit
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This is part of coreos/fedora-coreos-tracker#1151

Our generated disk images are largely just a "shell" around the egg
of an ostree commit.  There is almost nothing that lives
in the disk image that isn't in the commit.

(This is especially true now that a preparatory commit previous to
 this moved the *content* of our static `grub.cfg` into `image.json`)

In the original coreos-assembler design I'd tried to cleanly
separate builds of the ostree from disk image builds, but also
support linking them together (with matching version numbers, etc.)
The separate `image.yaml` was part of this.  This...mostly worked.

This change furthers that separation by having image builds input from
*just the ostree commit*.  Crucially we would no longer need the config
git repository to perform an image build.

And this in turn unlocks truly better separating ostree builds from
disk image builds in the pipeline *and* supporting
downstream tooling generating disk images from custom containers.

One neat thing here is we will finally fix a longstanding issue
where coreos-assembler fails when just the `image.yaml` changes:

Closes: coreos#972
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cgwalters committed Apr 13, 2022
1 parent 34106bc commit 0c07d52
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Showing 5 changed files with 41 additions and 12 deletions.
18 changes: 8 additions & 10 deletions src/cmd-buildextend-live
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@ import time

sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from cosalib.builds import Builds
from cosalib.cmdlib import run_verbose, sha256sum_file, generate_image_json
from cosalib.cmdlib import run_verbose, sha256sum_file, extract_image_json
from cosalib.cmdlib import import_ostree_commit, get_basearch, ensure_glob
from cosalib.meta import GenericBuildMeta

Expand Down Expand Up @@ -46,9 +46,6 @@ if not args.build:
args.build = builds.get_latest()
print(f"Targeting build: {args.build}")

image_json = generate_image_json('src/config/image.yaml')
squashfs_compression = 'lz4' if args.fast else image_json['squashfs-compression']

srcdir_prefix = "src/config/live/"

if not os.path.isdir(srcdir_prefix):
Expand All @@ -58,6 +55,13 @@ workdir = os.path.abspath(os.getcwd())
builddir = builds.get_build_dir(args.build)
buildmeta_path = os.path.join(builddir, 'meta.json')
buildmeta = GenericBuildMeta(workdir=workdir, build=args.build)
repo = os.path.join(workdir, 'tmp/repo')

# Grab the commit hash for this build
buildmeta_commit = buildmeta['ostree-commit']

image_json = extract_image_json(repo, buildmeta_commit)
squashfs_compression = 'lz4' if args.fast else image_json['squashfs-compression']

base_name = buildmeta['name']
if base_name == "rhcos" and args.fast:
Expand All @@ -71,12 +75,6 @@ if os.path.exists(build_semaphore):
raise Exception(
f"{build_semaphore} exists: another process is building live")


# Grab the commit hash for this build
buildmeta_commit = buildmeta['ostree-commit']

repo = os.path.join(workdir, 'tmp/repo')

# Don't run if it's already been done, unless forced
if 'live-iso' in buildmeta['images'] and not args.force:
print(f"'live' has already been built for {args.build}. Skipping.")
Expand Down
3 changes: 3 additions & 0 deletions src/cmd-buildextend-metal
Original file line number Diff line number Diff line change
Expand Up @@ -118,6 +118,9 @@ ostree_repo=${tmprepo}
# Ensure that we have the cached unpacked commit
import_ostree_commit_for_build "${build}"

image_json=image.json
extract_image_json "${tmprepo}" "${commit}" > "${image_json}"

image_format=raw
if [[ $image_type == qemu ]]; then
image_format=qcow2
Expand Down
21 changes: 21 additions & 0 deletions src/cmdlib.sh
Original file line number Diff line number Diff line change
Expand Up @@ -394,6 +394,13 @@ EOF
done
fi

local imagejsondir="${tmp_overridesdir}/imagejson"
export ostree_image_json="/usr/share/coreos-assembler/image.json"
mkdir -p "${imagejsondir}/usr/share/coreos-assembler/"
cp "${image_json}" "${imagejsondir}${ostree_image_json}"
commit_overlay cosa-image-json "${imagejsondir}"
layers="${layers} cosa-image-json"

local_overrides_lockfile="${tmp_overridesdir}/local-overrides.json"
if [ -n "${with_cosa_overrides}" ] && [[ -n $(ls "${overridesdir}/rpm/"*.rpm 2> /dev/null) ]]; then
(cd "${overridesdir}"/rpm && rm -rf .repodata && createrepo_c .)
Expand Down Expand Up @@ -874,6 +881,7 @@ builds.bump_timestamp()
print('Build ${buildid} was inserted ${arch:+for $arch}')")
}

# Prepare the image.json as part of an ostree image build
write_image_json() {
local srcfile=$1; shift
local outfile=$1; shift
Expand All @@ -884,6 +892,19 @@ from cosalib import cmdlib
cmdlib.write_image_json('${srcfile}', '${outfile}')")
}

# Fetch the image.json from the ostree commit to stdout.
# Should be used by disk image builds.
extract_image_json() {
local repo=$1; shift
local commit=$1; shift
(python3 -c "
import sys, json
sys.path.insert(0, '${DIR}')
from cosalib import cmdlib
json.dump(sys.stdout, cmdlib.extract_image_json('${repo}', '${commit}'), sort_keys=True)
")
}

# Shell wrapper for the Python import_ostree_commit
import_ostree_commit_for_build() {
local buildid=$1; shift
Expand Down
7 changes: 7 additions & 0 deletions src/cosalib/cmdlib.py
Original file line number Diff line number Diff line change
Expand Up @@ -350,6 +350,13 @@ def cmdlib_sh(script):
'''])


# Should be used by disk image builds to extract the image.json from the
# ostree commit.
def extract_image_json(repo, commit):
out = subprocess.check_output(['ostree', f'--repo={repo}', 'cat', commit, '/usr/share/coreos-assembler/image.json'])
return json.loads(out)


def generate_image_json(srcfile):
r = yaml.safe_load(open("/usr/lib/coreos-assembler/image-default.yaml"))
for k, v in flatten_image_yaml(srcfile).items():
Expand Down
4 changes: 2 additions & 2 deletions src/cosalib/ova.py
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@
sys.path.insert(0, f"{cosa_dir}/cosalib")
sys.path.insert(0, cosa_dir)

from cosalib.cmdlib import generate_image_json, image_info
from cosalib.cmdlib import extract_image_json, image_info
from cosalib.qemuvariants import QemuVariantImage


Expand Down Expand Up @@ -86,7 +86,7 @@ def generate_ovf_parameters(self, vmdk, cpu=2, memory=4096):
Returns a dictionary with the parameters needed to create an OVF file
based on the qemu, vmdk, image.yaml, and info from the build metadata
"""
image_json = generate_image_json('src/config/image.yaml')
image_json = extract_image_json(self._workdir, self.meta['ostree-commit'])

system_type = 'vmx-{}'.format(image_json['vmware-hw-version'])
os_type = image_json['vmware-os-type']
Expand Down

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