feat(build): route VM-internal pacstrap through host pacoloco

The build-host pacoloco routing from e2eb958 only covered mkarchiso's pacstrap. VMs spawned by scripts/test-install.sh ran their own pacstrap inside the guest, fetching ~600 packages per config from upstream and re-hitting the same archzfs corruption that bites the build host. A full 12-config test-install run exposed 7200+ package downloads to upstream flake.

I added a routing step to run_install() in test-install.sh, after the config file gets SCP'd to the VM and before archangel runs. It detects pacoloco on the host (port 9129, same probe as build.sh's) and rewrites the live system's /etc/pacman.conf over SSH. [core] and [extra] swap their Include lines for Server lines pointing at 10.0.2.2:9129/repo/archlinux/$repo/os/$arch. A preempt [archzfs] block lands ahead of archangel's default insertion.

10.0.2.2 is QEMU's SLIRP default gateway as seen from the guest, so the host's localhost:9129 maps to that address inside the VM. Pacoloco binds 0.0.0.0:9129, reachable from there without firewall changes.

The preempt matters because archangel's install_base checks for an existing [archzfs] block in /etc/pacman.conf and skips its own insertion when one is already there. Writing the pacoloco-routed [archzfs] up front means archangel keeps the routed version. The installed system's $MNTPOINT/etc/pacman.conf isn't touched: it gets upstream URLs like before, since the installed system shouldn't depend on the test host's proxy.

The status message uses a plain echo rather than test-install.sh's info() function. run_install() runs inside a bash -c subshell at line 864 that only exports ssh_cmd and run_install via declare -f. A bare info call there resolves to /usr/bin/info (the GNU info reader) and prints a confusing "No menu item" error. An inline comment in the code records the pitfall.

Verified end-to-end with scripts/test-install.sh single-disk: pacoloco's cache grew from 77MB (post-build) to 953MB (post-VM-install), the VM's pacstrap completed cleanly, and the install verified. Bats: still 181.

1 files changed, 21 insertions, 0 deletions

diff --git a/scripts/test-install.sh b/scripts/test-install.sh
index e5afcfb..7f2bcda 100755
--- a/scripts/test-install.sh
+++ b/scripts/test-install.sh
@@ -430,6 +430,27 @@ run_install() {
     sshpass -p "$SSH_PASSWORD" scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null \
         -P "$SSH_PORT" "$config" root@localhost:/root/test.conf 2>/dev/null
 
+    # Route VM pacstrap through the host's pacoloco when one is running
+    # locally. Catches archzfs corruption at the cache layer and speeds
+    # repeated VM test runs (no upstream re-fetch per config). 10.0.2.2
+    # is QEMU's SLIRP host gateway as seen from inside the guest, so
+    # the host's localhost:9129 maps to 10.0.2.2:9129 in there. Touches
+    # only the live system's /etc/pacman.conf; the installed system's
+    # $MNTPOINT/etc/pacman.conf keeps upstream URLs for ongoing use.
+    if (echo > /dev/tcp/localhost/9129) 2>/dev/null; then
+        # Plain echo, not info(): run_install gets invoked from a
+        # bash -c subshell at line 864 that only declares ssh_cmd and
+        # run_install via declare -f, so a bare info call resolves to
+        # /usr/bin/info (the GNU info reader) instead of the function.
+        echo "[INFO] Routing VM pacstrap through host pacoloco at 10.0.2.2:9129"
+        ssh_cmd "sed -i 's|^Include = /etc/pacman.d/mirrorlist|Server = http://10.0.2.2:9129/repo/archlinux/\$repo/os/\$arch|' /etc/pacman.conf"
+        # Preempt archangel's [archzfs] insertion. install_base at
+        # installer/archangel:716 skips adding [archzfs] when the block
+        # is already present, so writing it here with pacoloco URLs
+        # wins over the upstream URL the installer would otherwise use.
+        ssh_cmd "printf '[archzfs]\nServer = http://10.0.2.2:9129/repo/archzfs\nSigLevel = Never\n' >> /etc/pacman.conf"
+    fi
+
     # Run the installer (NO_ENCRYPT is set in the config file, not via flag)
     ssh_cmd "archangel --config-file /root/test.conf" || return 1