test: Add tests for missing /boot and --bootloader=none

Add two new integration tests:
- test-35-install-no-boot-dir: Tests install to-filesystem when /boot
  directory is absent
- test-36-install-bootloader-none: Tests install with --bootloader=none
  option to skip bootloader management

Signed-off-by: Xiaofeng Wang <henrywangxf@me.com>

Author: henrywang

tmt/plans/integration.fmf

@@ -188,4 +188,18 @@ execute:
     how: fmf
     test:
       - /tmt/tests/tests/test-36-rollback
+
+/plan-37-install-no-boot-dir:
+  summary: Test bootc install to-filesystem without /boot directory
+  discover:
+    how: fmf
+    test:
+      - /tmt/tests/tests/test-37-install-no-boot-dir
+
+/plan-38-install-bootloader-none:
+  summary: Test bootc install with --bootloader=none
+  discover:
+    how: fmf
+    test:
+      - /tmt/tests/tests/test-38-install-bootloader-none
 # END GENERATED PLANS

tmt/tests/booted/tap.nu

@@ -18,3 +18,62 @@ export def is_composefs [] {
     let st = bootc status --json | from json
     $st.status.booted.composefs? != null
 }
+
+# Get the target image for install tests based on the running OS
+# This ensures the target image matches the host OS to avoid version mismatches
+# (e.g., XFS features created by newer mkfs.xfs not recognized by older grub2)
+export def get_target_image [] {
+    # Parse os-release to get ID and VERSION_ID
+    let os = open /usr/lib/os-release
+        | lines
+        | filter {|l| $l != "" and not ($l | str starts-with "#") }
+        | parse "{key}={value}"
+        | reduce -f {} {|it, acc|
+            $acc | upsert $it.key ($it.value | str trim -c '"')
+        }
+
+    let id = $os.ID
+    let version_id = $os.VERSION_ID
+
+    # Construct the key for os-image-map.json
+    let key = if $id == "centos" {
+        # CentOS uses "centos-9" or "centos-10" format
+        $"centos-($version_id)"
+    } else if $id == "fedora" {
+        $"fedora-($version_id)"
+    } else if $id == "rhel" {
+        # RHEL uses "rhel-9.8" or "rhel-10.2" format
+        $"rhel-($version_id)"
+    } else {
+        # Fallback to centos-9 for unknown distros
+        "centos-9"
+    }
+
+    # Load the os-image-map.json - try multiple possible locations
+    let possible_paths = [
+        "hack/os-image-map.json",
+        "../../../hack/os-image-map.json",
+        "/var/home/bootc/hack/os-image-map.json"
+    ]
+
+    mut image_map = null
+    for p in $possible_paths {
+        if ($p | path exists) {
+            $image_map = (open $p)
+            break
+        }
+    }
+
+    # If map not found, use default centos-9 image
+    if ($image_map == null) {
+        return "docker://quay.io/centos-bootc/centos-bootc:stream9"
+    }
+
+    let image = $image_map.base | get -i $key
+    if ($image | is-empty) {
+        # Fallback to centos-9 if key not found
+        $"docker://($image_map.base.centos-9)"
+    } else {
+        $"docker://($image)"
+    }
+}

tmt/tests/booted/test-install-bootloader-none.nu

@@ -0,0 +1,31 @@
+# number: 38
+# tmt:
+#   summary: Test bootc install with --bootloader=none
+#   duration: 30m
+#
+use std assert
+use tap.nu
+
+let target_image = (tap get_target_image)
+
+def main [] {
+    tap begin "install with --bootloader=none"
+
+    truncate -s 10G disk.img
+
+    setenforce 0
+
+    systemd-run -p MountFlags=slave -qdPG -- /bin/sh -c $"
+set -xeuo pipefail
+bootc usr-overlay
+if test -d /sysroot/ostree; then mount --bind /usr/share/empty /sysroot/ostree; fi
+rm -vrf /usr/lib/bootupd/updates
+rm -vrf /usr/lib/bootc/bound-images.d
+# Install with --bootloader=none - skips bootloader management
+bootc install to-disk --disable-selinux --via-loopback --filesystem xfs --bootloader=none --source-imgref ($target_image) ./disk.img
+"
+
+    rm -f disk.img
+
+    tap ok
+}

tmt/tests/booted/test-install-no-boot-dir.nu

@@ -0,0 +1,35 @@
+# number: 37
+# tmt:
+#   summary: Test bootc install to-filesystem without /boot directory
+#   duration: 30m
+#
+use std assert
+use tap.nu
+
+let target_image = (tap get_target_image)
+
+def main [] {
+    tap begin "install to-filesystem without /boot"
+
+    mkdir /var/mnt
+    truncate -s 10G disk.img
+    mkfs.ext4 disk.img
+    mount -o loop disk.img /var/mnt
+
+    setenforce 0
+
+    systemd-run -p MountFlags=slave -qdPG -- /bin/sh -c $"
+set -xeuo pipefail
+bootc usr-overlay
+if test -d /sysroot/ostree; then mount --bind /usr/share/empty /sysroot/ostree; fi
+rm -vrf /usr/lib/bootupd/updates
+rm -vrf /usr/lib/bootc/bound-images.d
+# Install to filesystem without /boot - skips bootloader management
+bootc install to-filesystem --disable-selinux --bootloader=none --source-imgref ($target_image) /var/mnt
+"
+
+    umount /var/mnt
+    rm -f disk.img
+
+    tap ok
+}

tmt/tests/tests.fmf

@@ -111,3 +111,13 @@
   summary: Test bootc rollback functionality through image switch and rollback cycle
   duration: 30m
   test: nu booted/test-rollback.nu
+
+/test-37-install-no-boot-dir:
+  summary: Test bootc install to-filesystem without /boot directory
+  duration: 30m
+  test: nu booted/test-install-no-boot-dir.nu
+
+/test-38-install-bootloader-none:
+  summary: Test bootc install with --bootloader=none
+  duration: 30m
+  test: nu booted/test-install-bootloader-none.nu