examples: add bootc/ directory

examples/bootc/build

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -eux
+
+cd "${0%/*}"
+image="${1:-docker://quay.io/fedora/fedora-bootc:42}"
+
+cargo build --release
+cp ../../target/release/cfsctl .
+mkdir -p initrd/usr/bin
+cp ../../target/release/composefs-setup-root initrd/usr/bin
+
+# rm -rf tmp
+../common/install-systemd-boot
+
+mkdir -p tmp/sysroot/composefs
+./cfsctl --repo tmp/sysroot/composefs oci pull "${image}" image
+./cfsctl --repo tmp/sysroot/composefs oci prepare-boot refs/image --bootdir tmp/efi --cmdline rw --cmdline console=ttyS0,115200 --cmdline enforcing=0 --cmdline root=/dev/vda2 --entry-id example
+
+(
+    cd initrd
+    find -print0 | cpio --null -ov --format=newc
+) | gzip -9 > tmp/efi/composefs-setup-root.img
+
+echo 'initrd /composefs-setup-root.img' >> tmp/efi/loader/entries/example.conf
+
+../common/make-image bootc-efi.qcow2

examples/bootc/initrd/usr/bin/.gitignore

@@ -0,0 +1 @@
+/composefs-setup-root

examples/bootc/initrd/usr/lib/systemd/system/composefs-setup-root.service

@@ -0,0 +1,34 @@
+# Copyright (C) 2013 Colin Walters <[email protected]>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library. If not, see <https://www.gnu.org/licenses/>.
+
+[Unit]
+DefaultDependencies=no
+ConditionKernelCommandLine=composefs
+ConditionPathExists=/etc/initrd-release
+After=sysroot.mount
+Requires=sysroot.mount
+Before=initrd-root-fs.target
+Before=initrd-switch-root.target
+
+OnFailure=emergency.target
+OnFailureJobMode=isolate
+
+[Service]
+Type=oneshot
+ExecStart=/usr/bin/composefs-setup-root
+StandardInput=null
+StandardOutput=journal
+StandardError=journal+console
+RemainAfterExit=yes

examples/bootc/initrd/usr/lib/systemd/system/initrd-root-fs.target.wants/composefs-setup-root.service

@@ -0,0 +1 @@
+../composefs-setup-root.service

src/bin/composefs-setup-root.rs

@@ -74,7 +74,7 @@ struct Args {
 
     #[arg(
         long,
-        default_value = "/usr/lib/ostree/prepare-root.conf",
+        default_value = "/usr/lib/composefs/setup-root.conf",
         help = "Config path (for testing)"
     )]
     config: PathBuf,