classes: rootfs-postcommands: add skip option to overlayfs_qa_check

The overlayfs_qa_check checks if the current root file system has a
mount configured for each overlayfs, when the overlayfs class is used.

However there are certain instances where this mount point is created at
runtime and not static in a fstab entry or systemd mount unit.

One such case would be if overlayfs-etc is used, where the device is
mounted in the preinit script and not via a mount unit or fstab entry.

However there are other possibilities for this as well, like startup
scripts that support a dynamic partition layout. For instance when
systemd-repart is used.

This adds the `OVERLAYFS_QA_SKIP` variable, which allows to define QA
skips via its flags. In principle it supports multiple QA skip flags
separated by whitespace, but only one (`mount-configured`) is
implemented here. To skip this QA check simply add `mount-configured` to
the flag of `OVERLAYFS_QA_SKIP` with the same name. For instance if a
overlayfs is configured as:

	OVERLAYFS_MOUNT_POINT[data] = "/data"

Skipping this QA check can be done by setting:

	OVERLAYFS_QA_SKIP[data] = "mount-configured"

Also add a testcase and fix a typo (fstat -> fstab).

(From OE-Core rev: 2ce9173169a2a86392c4a85fe9be7fbbd7353b7f)

Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 27 insertions, 3 deletions

diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
index 7b92df69c5..9b6824043c 100644
--- a/meta/classes/rootfs-postcommands.bbclass
+++ b/meta/classes/rootfs-postcommands.bbclass
@@ -398,6 +398,10 @@ python overlayfs_qa_check() {
 
     allUnitExist = True;
     for mountPoint in overlayMountPoints:
+        qaSkip = (d.getVarFlag("OVERLAYFS_QA_SKIP", mountPoint) or "").split()
+        if "mount-configured" in qaSkip:
+            continue
+
         mountPath = d.getVarFlag('OVERLAYFS_MOUNT_POINT', mountPoint)
         if mountPath in fstabDevices:
             continue
@@ -407,8 +411,10 @@ python overlayfs_qa_check() {
                for dirpath in searchpaths):
             continue
 
-        bb.warn('Mount path %s not found in fstat and unit %s not found '
-                'in systemd unit directories' % (mountPath, mountUnit))
+        bb.warn(f'Mount path {mountPath} not found in fstab and unit '
+                f'{mountUnit} not found in systemd unit directories.')
+        bb.warn(f'Skip this check by setting OVERLAYFS_QA_SKIP[{mountPoint}] = '
+                '"mount-configured"')
         allUnitExist = False;
 
     if not allUnitExist:
diff --git a/meta/lib/oeqa/selftest/cases/overlayfs.py b/meta/lib/oeqa/selftest/cases/overlayfs.py
index 472746a64f..ce1d2f1ec3 100644
--- a/meta/lib/oeqa/selftest/cases/overlayfs.py
+++ b/meta/lib/oeqa/selftest/cases/overlayfs.py
@@ -62,11 +62,29 @@ DISTRO_FEATURES += "systemd overlayfs"
         self.add_overlay_conf_to_machine()
 
         res = bitbake('core-image-minimal', ignore_status=True)
-        line = getline(res, " Mount path /mnt/overlay not found in fstat and unit mnt-overlay.mount not found in systemd unit directories")
+        line = getline(res, " Mount path /mnt/overlay not found in fstab and unit mnt-overlay.mount not found in systemd unit directories")
         self.assertTrue(line and line.startswith("WARNING:"), msg=res.output)
         line = getline(res, "Not all mount paths and units are installed in the image")
         self.assertTrue(line and line.startswith("ERROR:"), msg=res.output)
 
+    def test_not_all_units_installed_but_qa_skipped(self):
+        """
+        Summary:   Test skipping the QA check
+        Expected:  Image is created successfully
+        Author:    Claudius Heine <ch@denx.de>
+        """
+
+        config = """
+IMAGE_INSTALL:append = " overlayfs-user"
+DISTRO_FEATURES += "systemd overlayfs"
+OVERLAYFS_QA_SKIP[mnt-overlay] = "mount-configured"
+"""
+
+        self.write_config(config)
+        self.add_overlay_conf_to_machine()
+
+        bitbake('core-image-minimal')
+
     def test_mount_unit_not_set(self):
         """
         Summary:   Test whether mount unit was set properly