| Summary: | Misleading error message when permission denied opening a disk image | ||
|---|---|---|---|
| Product: | [Community] Virtualization Tools | Reporter: | Richard W.M. Jones <rjones> |
| Component: | libguestfs | Assignee: | Richard W.M. Jones <rjones> |
| Status: | CLOSED UPSTREAM | QA Contact: | |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | unspecified | CC: | mbooth, virt-maint |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-10-21 15:31:58 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
Description of problem: When you try to add a disk image which is read-only, qemu fails to start up and qemu correctly prints an error message. However the error message is eaten by libguestfs, and instead we see this error: $ guestfish -a test1.img run : list-devices libguestfs: error: unexpected end of file when reading from daemon. This usually means the libguestfs appliance failed to start up. Please enable debugging (LIBGUESTFS_DEBUG=1) and rerun the command, then look at the debug messages output prior to this error. Or you can run 'libguestfs-test-tool' and post the complete output into a bug report or message to the libguestfs mailing list. Version-Release number of selected component (if applicable): 1.13.21 How reproducible: 100% Steps to Reproduce: rm test1.img truncate -s 1G test1.img sudo chown root.root test1.img sudo chmod 0444 test1.img Now compare opening this test image with and without --ro flag: $ guestfish -a test1.img --ro run : list-devices /dev/vda $ guestfish -a test1.img run : list-devices libguestfs: error: unexpected end of file when reading from daemon. This usually means the libguestfs appliance failed to start up. Please enable debugging (LIBGUESTFS_DEBUG=1) and rerun the command, then look at the debug messages output prior to this error. Or you can run 'libguestfs-test-tool' and post the complete output into a bug report or message to the libguestfs mailing list. Adding -v or setting LIBGUESTFS_DEBUG=1 shows the real error message, although the output is a bit messed up: [...] -append 'panic=1 console=ttyS0 udevtimeout=300 no_timer_check acpi=off printk.time=1 cgroup_disable=memory selinux=0 guestfs_verbose=1 TERM=xterm ' \ -drive file=/var/tmp/.guestfs-500/root.28300,snapshot=on,if=virtio,cache=unsafeqemu-kvm: -drive file=test1.img,cache=off,if=virtio: could not open disk image test1.img: Permission denied Actual results: Confusing error message. Expected results: Should capture and show the qemu error message. Additional info: