donotmerge: IBX changes

Some (trash, temporary) changes I had to perform on bootc to get IBX to work

- `./Containerfile` builds a bootable image from an existing normal IBX seed
- `./build_seed.sh` is just a helper script

To install on recipient

```
sudo podman run --privileged -v $PWD/authkeys:/authkeys --env RUST_LOG=trace -v /var/tmp:/var/tmp -v /var/lib/containers/storage:/var/lib/containers/storage --pid=host -it quay.io/otuchfel/bootc:seed bootc install to-existing-root --acknowledge-destructive --stateroot omeroot --root-ssh-authorized-keys /authkeys --bound-images pull
```

This PR only exists to start discussions around concrete issues, it's not meant to be merged.

Author: omertuc

.dockerignore

@@ -4,3 +4,5 @@ target
 # These directories don't contribute to our container build
 docs/
 plans/
+Containerfile
+build_seed.sh

Containerfile

@@ -0,0 +1,25 @@
+FROM quay.io/centos/centos:stream9 as build
+COPY hack/build.sh /build.sh
+RUN /build.sh && rm -v /build.sh
+COPY . /build
+WORKDIR /build
+RUN mkdir -p /build/target/dev-rootfs  # This can hold arbitrary extra content
+# See https://www.reddit.com/r/rust/comments/126xeyx/exploring_the_problem_of_faster_cargo_docker/
+# We aren't using the full recommendations there, just the simple bits.
+RUN --mount=type=cache,target=/build/target --mount=type=cache,target=/var/roothome make test-bin-archive && mkdir -p /out && cp target/bootc.tar /out
+RUN mkdir -p /build/target/dev-rootfs  # This can hold arbitrary extra content
+
+FROM quay.io/otuchfel/ostbackup:serv1 as seed
+
+# ____________________________________________________________________________
+
+FROM quay.io/openshift-release-dev/ocp-v4.0-art-dev@sha256:5b1124faf4b73753b4679085604dd8cb810c4a7a2e659978f5c80183bb165f94
+
+LABEL com.openshift.lifecycle-agent.seed_format_version=3
+
+RUN mkdir -p /usr/lib/bootc/install
+
+COPY --from=seed --exclude=ostree.tgz / /var/tmp/seed
+
+COPY --from=build /out/bootc.tar /tmp
+RUN tar -C / -xvf /tmp/bootc.tar && rm -vrf /tmp/*

Makefile

@@ -51,10 +51,10 @@ install-all: install install-ostree-hooks
 	install -D -m 0755 target/release/tests-integration $(DESTDIR)$(prefix)/bin/bootc-integration-tests 
 
 bin-archive: all
-	$(MAKE) install DESTDIR=tmp-install && $(TAR_REPRODUCIBLE) --zstd -C tmp-install -cf target/bootc.tar.zst . && rm tmp-install -rf
+	$(MAKE) install DESTDIR=tmp-install && $(TAR_REPRODUCIBLE) -C tmp-install -cf target/bootc.tar . && rm tmp-install -rf
 
 test-bin-archive: all
-	$(MAKE) install-all DESTDIR=tmp-install && $(TAR_REPRODUCIBLE) --zstd -C tmp-install -cf target/bootc.tar.zst . && rm tmp-install -rf
+	$(MAKE) install-all DESTDIR=tmp-install && $(TAR_REPRODUCIBLE) -C tmp-install -cf target/bootc.tar . && rm tmp-install -rf
 
 test-tmt:
 	cargo xtask test-tmt

build_seed.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+SCRIPT_DIR=$(dirname $0)
+
+cd $SCRIPT_DIR
+
+podman build -t bootcseed -f Containerfile .
+podman tag bootcseed:latest quay.io/otuchfel/bootc:seed
+podman push quay.io/otuchfel/bootc:seed

hack/Containerfile

@@ -17,7 +17,7 @@ WORKDIR /build
 RUN mkdir -p /build/target/dev-rootfs  # This can hold arbitrary extra content
 # See https://www.reddit.com/r/rust/comments/126xeyx/exploring_the_problem_of_faster_cargo_docker/
 # We aren't using the full recommendations there, just the simple bits.
-RUN --mount=type=cache,target=/build/target --mount=type=cache,target=/var/roothome make test-bin-archive && mkdir -p /out && cp target/bootc.tar.zst /out
+RUN --mount=type=cache,target=/build/target --mount=type=cache,target=/var/roothome make test-bin-archive && mkdir -p /out && cp target/bootc.tar /out
 
 FROM $base
 # We support e.g. adding cloud-init
@@ -29,8 +29,8 @@ COPY hack/install-test-configs/* /usr/lib/bootc/install/
 # And some test kargs
 COPY hack/test-kargs /usr/lib/bootc/kargs.d/
 # Inject our built code
-COPY --from=build /out/bootc.tar.zst /tmp
-RUN tar -C / --zstd -xvf /tmp/bootc.tar.zst && rm -vrf /tmp/*
+COPY --from=build /out/bootc.tar /tmp
+RUN tar -C / -xvf /tmp/bootc.tar && rm -vrf /tmp/*
 # Also copy over arbitrary bits from the target root
 COPY --from=build /build/target/dev-rootfs/ /
 # Test our own linting

lib/src/install.rs

@@ -1112,8 +1112,8 @@ fn ensure_var() -> Result<()> {
 /// will traverse the link.
 #[context("Linking tmp mounts to host")]
 pub(crate) fn setup_tmp_mounts() -> Result<()> {
-    let st = rustix::fs::statfs("/tmp")?;
-    if st.f_type == libc::TMPFS_MAGIC {
+    let slash_tmp_statfs = rustix::fs::statfs("/tmp")?;
+    if slash_tmp_statfs.f_type == libc::TMPFS_MAGIC {
         tracing::trace!("Already have tmpfs /tmp")
     } else {
         // Note we explicitly also don't want a "nosuid" tmp, because that