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|
package container
import (
"errors"
"io/fs"
"os"
"testing"
)
func TestMountOverlayOp(t *testing.T) {
checkOpBehaviour(t, []opBehaviourTestCase{
{"mkdirTemp invalid ephemeral", &Params{ParentPerm: 0705}, &MountOverlayOp{
Target: MustAbs("/"),
Lower: []*Absolute{
MustAbs("/var/lib/planterette/base/debian:f92c9052"),
MustAbs("/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"),
},
Upper: MustAbs("/proc/"),
}, nil, msg.WrapErr(fs.ErrInvalid, `upperdir has unexpected value "/proc/"`), nil, nil},
{"mkdirTemp upper ephemeral", &Params{ParentPerm: 0705}, &MountOverlayOp{
Target: MustAbs("/"),
Lower: []*Absolute{
MustAbs("/var/lib/planterette/base/debian:f92c9052"),
MustAbs("/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"),
},
Upper: MustAbs("/"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/var/lib/planterette/base/debian:f92c9052"}, "/var/lib/planterette/base/debian:f92c9052", nil},
{"evalSymlinks", expectArgs{"/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"}, "/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot", os.FileMode(0705)}, nil, nil},
{"mkdirTemp", expectArgs{"/", "overlay.upper.*"}, "overlay.upper.32768", errUnique},
}, wrapErrSelf(errUnique)},
{"mkdirTemp work ephemeral", &Params{ParentPerm: 0705}, &MountOverlayOp{
Target: MustAbs("/"),
Lower: []*Absolute{
MustAbs("/var/lib/planterette/base/debian:f92c9052"),
MustAbs("/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"),
},
Upper: MustAbs("/"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/var/lib/planterette/base/debian:f92c9052"}, "/var/lib/planterette/base/debian:f92c9052", nil},
{"evalSymlinks", expectArgs{"/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"}, "/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot", os.FileMode(0705)}, nil, nil},
{"mkdirTemp", expectArgs{"/", "overlay.upper.*"}, "overlay.upper.32768", nil},
{"mkdirTemp", expectArgs{"/", "overlay.work.*"}, "overlay.work.32768", errUnique},
}, wrapErrSelf(errUnique)},
{"success ephemeral", &Params{ParentPerm: 0705}, &MountOverlayOp{
Target: MustAbs("/"),
Lower: []*Absolute{
MustAbs("/var/lib/planterette/base/debian:f92c9052"),
MustAbs("/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"),
},
Upper: MustAbs("/"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/var/lib/planterette/base/debian:f92c9052"}, "/var/lib/planterette/base/debian:f92c9052", nil},
{"evalSymlinks", expectArgs{"/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052"}, "/var/lib/planterette/app/org.chromium.Chromium@debian:f92c9052", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot", os.FileMode(0705)}, nil, nil},
{"mkdirTemp", expectArgs{"/", "overlay.upper.*"}, "overlay.upper.32768", nil},
{"mkdirTemp", expectArgs{"/", "overlay.work.*"}, "overlay.work.32768", nil},
{"mount", expectArgs{"overlay", "/sysroot", "overlay", uintptr(0), "" +
"upperdir=overlay.upper.32768," +
"workdir=overlay.work.32768," +
"lowerdir=" +
`/host/var/lib/planterette/base/debian\:f92c9052:` +
`/host/var/lib/planterette/app/org.chromium.Chromium@debian\:f92c9052,` +
"userxattr"}, nil, nil},
}, nil},
{"short lower ro", &Params{ParentPerm: 0755}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{
MustAbs("/mnt-root/nix/.ro-store"),
},
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/.ro-store", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0755)}, nil, nil},
}, msg.WrapErr(fs.ErrInvalid, "readonly overlay requires at least two lowerdir")},
{"success ro", &Params{ParentPerm: 0755}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{
MustAbs("/mnt-root/nix/.ro-store"),
MustAbs("/mnt-root/nix/.ro-store0"),
},
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/.ro-store", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store0"}, "/mnt-root/nix/.ro-store0", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0755)}, nil, nil},
{"mount", expectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
"lowerdir=" +
"/host/mnt-root/nix/.ro-store:" +
"/host/mnt-root/nix/.ro-store0," +
"userxattr"}, nil, nil},
}, nil},
{"nil lower", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil},
}, msg.WrapErr(fs.ErrInvalid, "overlay requires at least one lowerdir")},
{"evalSymlinks upper", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", errUnique},
}, wrapErrSelf(errUnique), nil, nil},
{"evalSymlinks work", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", errUnique},
}, wrapErrSelf(errUnique), nil, nil},
{"evalSymlinks lower", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", errUnique},
}, wrapErrSelf(errUnique), nil, nil},
{"mkdirAll", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, errUnique},
}, wrapErrSelf(errUnique)},
{"mount", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil},
{"mount", expectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "upperdir=/host/mnt-root/nix/.rw-store/.upper,workdir=/host/mnt-root/nix/.rw-store/.work,lowerdir=/host/mnt-root/nix/ro-store,userxattr"}, nil, errUnique},
}, wrapErrSuffix(errUnique, `cannot mount overlay on "/nix/store":`)},
{"success single layer", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil},
{"mount", expectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
"upperdir=/host/mnt-root/nix/.rw-store/.upper," +
"workdir=/host/mnt-root/nix/.rw-store/.work," +
"lowerdir=/host/mnt-root/nix/ro-store," +
"userxattr"}, nil, nil},
}, nil},
{"success", &Params{ParentPerm: 0700}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{
MustAbs("/mnt-root/nix/.ro-store"),
MustAbs("/mnt-root/nix/.ro-store0"),
MustAbs("/mnt-root/nix/.ro-store1"),
MustAbs("/mnt-root/nix/.ro-store2"),
MustAbs("/mnt-root/nix/.ro-store3"),
},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, []kexpect{
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/upper"}, "/mnt-root/nix/.rw-store/.upper", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.rw-store/work"}, "/mnt-root/nix/.rw-store/.work", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store"}, "/mnt-root/nix/ro-store", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store0"}, "/mnt-root/nix/ro-store0", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store1"}, "/mnt-root/nix/ro-store1", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store2"}, "/mnt-root/nix/ro-store2", nil},
{"evalSymlinks", expectArgs{"/mnt-root/nix/.ro-store3"}, "/mnt-root/nix/ro-store3", nil},
}, nil, []kexpect{
{"mkdirAll", expectArgs{"/sysroot/nix/store", os.FileMode(0700)}, nil, nil},
{"mount", expectArgs{"overlay", "/sysroot/nix/store", "overlay", uintptr(0), "" +
"upperdir=/host/mnt-root/nix/.rw-store/.upper," +
"workdir=/host/mnt-root/nix/.rw-store/.work," +
"lowerdir=" +
"/host/mnt-root/nix/ro-store:" +
"/host/mnt-root/nix/ro-store0:" +
"/host/mnt-root/nix/ro-store1:" +
"/host/mnt-root/nix/ro-store2:" +
"/host/mnt-root/nix/ro-store3," +
"userxattr"}, nil, nil},
}, nil},
})
t.Run("unreachable", func(t *testing.T) {
t.Run("nil Upper non-nil Work not ephemeral", func(t *testing.T) {
wantErr := msg.WrapErr(fs.ErrClosed, "impossible overlay state reached")
if err := (&MountOverlayOp{
Work: MustAbs("/"),
}).early(nil, nil); !errors.Is(err, wantErr) {
t.Errorf("apply: error = %v, want %v", err, wantErr)
}
})
})
checkOpsValid(t, []opValidTestCase{
{"nil", (*MountOverlayOp)(nil), false},
{"zero", new(MountOverlayOp), false},
{"nil lower", &MountOverlayOp{Target: MustAbs("/"), Lower: []*Absolute{nil}}, false},
{"ro", &MountOverlayOp{Target: MustAbs("/"), Lower: []*Absolute{MustAbs("/")}}, true},
{"ro work", &MountOverlayOp{Target: MustAbs("/"), Work: MustAbs("/tmp/")}, false},
{"rw", &MountOverlayOp{Target: MustAbs("/"), Lower: []*Absolute{MustAbs("/")}, Upper: MustAbs("/"), Work: MustAbs("/")}, true},
})
checkOpsBuilder(t, []opsBuilderTestCase{
{"full", new(Ops).Overlay(
MustAbs("/nix/store"),
MustAbs("/mnt-root/nix/.rw-store/upper"),
MustAbs("/mnt-root/nix/.rw-store/work"),
MustAbs("/mnt-root/nix/.ro-store"),
), Ops{
&MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
},
}},
{"ephemeral", new(Ops).OverlayEphemeral(MustAbs("/nix/store"), MustAbs("/mnt-root/nix/.ro-store")), Ops{
&MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/"),
},
}},
{"readonly", new(Ops).OverlayReadonly(MustAbs("/nix/store"), MustAbs("/mnt-root/nix/.ro-store")), Ops{
&MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
},
}},
})
checkOpIs(t, []opIsTestCase{
{"zero", new(MountOverlayOp), new(MountOverlayOp), false},
{"differs target", &MountOverlayOp{
Target: MustAbs("/nix/store/differs"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work")}, false},
{"differs lower", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store/differs")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work")}, false},
{"differs upper", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper/differs"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work")}, false},
{"differs work", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work/differs"),
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work")}, false},
{"equals ro", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")}}, true},
{"equals", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work")}, true},
})
checkOpMeta(t, []opMetaTestCase{
{"nix", &MountOverlayOp{
Target: MustAbs("/nix/store"),
Lower: []*Absolute{MustAbs("/mnt-root/nix/.ro-store")},
Upper: MustAbs("/mnt-root/nix/.rw-store/upper"),
Work: MustAbs("/mnt-root/nix/.rw-store/work"),
}, "mounting", `overlay on "/nix/store" with 1 layers`},
})
}
|
