48 lines
1.9 KiB
Bash
Executable File
48 lines
1.9 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Rebuild a guest's cloud-init seed image and publish it into the libvirt pool.
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# Run on the lab host.
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#
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# ./rebuild-seed.sh 1
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#
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# The same content lives in three places: the source YAML, the ISO, and the
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# uploaded pool volume. Editing the YAML alone changes nothing, which is why
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# this is a script and not a set of remembered commands.
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#
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# A rebuilt seed only takes effect on a freshly created VM. cloud-init runs its
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# per-instance modules once per instance-id, so an existing guest ignores it.
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set -euo pipefail
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N="${1:?usage: rebuild-seed.sh <1|2>}"
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CLOUD_DIR="${CLOUD_DIR:-$HOME/workspace/cloud}"
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POOL="${POOL:-default}"
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export LIBVIRT_DEFAULT_URI="${LIBVIRT_DEFAULT_URI:-qemu:///system}"
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cd "$CLOUD_DIR"
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src="kc-lab-${N}.yaml"
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iso="seed-kc-lab-${N}.iso"
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meta="meta-kc-lab-${N}"
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[ -f "$src" ] || { echo "missing $CLOUD_DIR/$src" >&2; exit 1; }
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# A fresh instance-id makes cloud-init treat the guest as new and re-run the
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# per-instance modules.
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printf 'instance-id: kc-lab-%s-%s\nlocal-hostname: kc-lab-%s\n' \
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"$N" "$(date +%s)" "$N" > "$meta"
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# NoCloud looks for a volume labelled cidata holding files named exactly
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# user-data and meta-data. -graft-points renames them inside the image so no
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# staging directory is needed.
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xorrisofs -quiet -output "$iso" -volid CIDATA -joliet -rock -graft-points \
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"/user-data=${src}" "/meta-data=${meta}"
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size="$(stat -c%s "$iso")"
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virsh vol-delete --pool "$POOL" "$iso" >/dev/null 2>&1 || true
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virsh vol-create-as "$POOL" "$iso" "$size" --format raw >/dev/null
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virsh vol-upload --pool "$POOL" "$iso" "$iso"
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echo "$iso published to pool '$POOL' ($size bytes)"
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echo "attach it as a virtio disk, not a SATA cdrom:"
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echo " --disk vol=${POOL}/${iso},device=disk,bus=virtio,readonly=on"
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echo "Debian genericcloud images carry no AHCI driver, so a SATA cdrom is invisible"
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echo "to the guest and cloud-init fails with no error anywhere."
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