Allow lazy unmount of special bind-mounts

Signed-off-by: David Abdurachmanov <davidlt@rivosinc.com>

livecd-tools.spec

@@ -17,7 +17,7 @@
 Summary: Tools for building live CDs
 Name: livecd-tools
 Version: 31.0
-Release: 3%{?dist}
+Release: 3.0.riscv64%{?dist}
 %if 0%{?fedora}
 Epoch: 1
 %endif
@@ -25,6 +25,8 @@ License: GPLv2
 URL: https://github.com/livecd-tools/livecd-tools
 Source0: https://releases.pagure.org/%{name}/%{name}-%{version}.tar.gz
 
+Patch0: test-fix.patch
+
 BuildRequires: make
 %if %{with python2}
 BuildRequires: python2-devel
@@ -63,6 +65,8 @@ Requires: dosfstools >= 2.11-8
 Requires: e2fsprogs
 Requires: lorax >= 18.3
 Requires: rsync
+Requires: lsof
+Requires: psmisc
 
 %if ! 0%{?rhel}
 # hfs+ support for Macs
@@ -225,6 +229,10 @@ rm -rfv %{buildroot}%{_mandir}/man8/livecd-iso-to-*
 %endif
 
 %changelog
+* Mon Apr 17 2023 David Abdurachmanov <davidlt@rivosinc.com> - 1:31.0-3.0.riscv64
+- Collect more information what is blocking mount point
+- Special bind-mounts can be lazy unmounted.
+
 * Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 1:31.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
 

test-fix.patch

@@ -0,0 +1,78 @@
+diff --git a/imgcreate/fs.py b/imgcreate/fs.py
+index f999d05..5c5a003 100644
+--- a/imgcreate/fs.py
++++ b/imgcreate/fs.py
+@@ -820,8 +820,18 @@ class DiskMount(Mount):
+     def unmount(self):
+         if self.mounted:
+             logging.info("Unmounting directory %s" % self.mountdir)
++            time.sleep(10)
+             rc = call(['umount', self.mountdir])
+             if rc != 0:
++                logging.info("- - - lsof %s - - -" % self.mountdir)
++                call(['lsof', '+c0', self.mountdir])
++                logging.info("- - - lsof %s - - -" % self.mountdir)
++                logging.info("- - - fuser %s - - -" % self.mountdir)
++                call(['fuser', '-v', '-m',  self.mountdir])
++                logging.info("- - - fuser %s - - -" % self.mountdir)
++                logging.info("- - - pstree - - -")
++                call(['pstree', '-Talp'])
++                logging.info("- - - pstree - - -")
+                 call(['umount', '-l', self.mountdir])
+                 raise MountError(umount_fail_fmt % self.mountdir)
+             self.mounted = False
+@@ -981,8 +991,18 @@ class OverlayFSMount(Mount):
+         if not self.mounted:
+             return
+ 
++        time.sleep(10)
+         rc = call(['umount', self.mountdir])
+         if rc != 0:
++            logging.info("- - - lsof %s - - -" % self.mountdir)
++            call(['lsof', '+c0', self.mountdir])
++            logging.info("- - - lsof %s - - -" % self.mountdir)
++            logging.info("- - - fuser %s - - -" % self.mountdir)
++            call(['fuser', '-v', '-m',  self.mountdir])
++            logging.info("- - - fuser %s - - -" % self.mountdir)
++            logging.info("- - - pstree - - -")
++            call(['pstree', '-Talp'])
++            logging.info("- - - pstree - - -")
+             call(['umount', '-l', self.mountdir])
+             raise MountError(umount_fail_fmt % self.mountdir)
+         if self.cowmnt:
+@@ -1059,10 +1079,21 @@ class BindChrootMount():
+             self.mounted = False
+             return
+ 
++        time.sleep(10)
+         rc = call(['umount', self.dest])
+         if rc != 0:
++            logging.info("- - - lsof %s - - -" % self.dest)
++            call(['lsof', '+c0',  self.dest])
++            logging.info("- - - lsof %s - - -" % self.dest)
++            logging.info("- - - fuser %s - - -" % self.dest)
++            call(['fuser', '-v', '-m',  self.dest])
++            logging.info("- - - fuser %s - - -" % self.dest)
++            logging.info("- - - pstree - - -")
++            call(['pstree', '-Talp'])
++            logging.info("- - - pstree - - -")
+             call(['umount', '-l', self.dest])
+-            raise MountError(umount_fail_fmt % self.dest)
++            if self.src.strip() not in ('/sys', '/proc', '/dev/pts'):
++                raise MountError(umount_fail_fmt % self.dest)
+         self.mounted = False
+ 
+     def cleanup(self):
+diff --git a/imgcreate/util.py b/imgcreate/util.py
+index fad6772..04380c9 100644
+--- a/imgcreate/util.py
++++ b/imgcreate/util.py
+@@ -32,7 +32,7 @@ def call(*popenargs, **kwargs):
+                          stderr=subprocess.STDOUT, **kwargs)
+     rc = p.wait()
+     fp = io.open(p.stdout.fileno(), mode="r", encoding="utf-8", closefd=False)
+-    stdout = fp.read().split()
++    stdout = fp.read().splitlines()
+     fp.close()
+ 
+     # Log output using logging module