snapd

Snapd runtime error in AL2023

Bug #2045264 reported by Milos on 2023-11-30

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	snapd	Triaged	Medium	Unassigned

Bug Description

Hi, I'm having difficulties installing snaps in AL2023 OS.

I've tried in two different ways:

Boot an amazon linux machine (AL2023)

#uname -a
```
Linux ip-172-31-46-147.ec2.internal 6.1.61-85.141.amzn2023.x86_64 #1 SMP PREEMPT_DYNAMIC Wed Nov 8 00:39:18 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
```

Enable `squashfs` module (and add it to /etc/modules)

Squashfs config:
```
CONFIG_SQUASHFS=m
CONFIG_SQUASHFS_FILE_CACHE=y
# CONFIG_SQUASHFS_FILE_DIRECT is not set
CONFIG_SQUASHFS_DECOMP_SINGLE=y
# CONFIG_SQUASHFS_DECOMP_MULTI is not set
# CONFIG_SQUASHFS_DECOMP_MULTI_PERCPU is not set
CONFIG_SQUASHFS_XATTR=y
CONFIG_SQUASHFS_ZLIB=y
CONFIG_SQUASHFS_LZ4=y
CONFIG_SQUASHFS_LZO=y
CONFIG_SQUASHFS_XZ=y
CONFIG_SQUASHFS_ZSTD=y
# CONFIG_SQUASHFS_4K_DEVBLK_SIZE is not set
# CONFIG_SQUASHFS_EMBEDDED is not set
CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE=3
```

Restart the VM, and make sure that:
`lsmod` outputs `squashfs` and `loop`

I tried installing it in two ways:

#### 1. Install from EPEL9 (some packages might not be necessary)

sudo yum install squashfuse-libs-0.1.104-1.el9.x86_64.rpm squashfuse-0.1.104-1.el9.x86_64.rpm squashfs-tools-ng-1.2.0-2.el9.x86_64.rpm squashfs-tools-ng-devel-1.2.0-2.el9.x86_64.rpm squashfs-tools-ng-libs-1.2.0-2.el9.x86_64.rpm squashfuse-devel-0.1.104-1.el9.x86_64.rpm snap-confine-2.58.3-1.el9.x86_64.rpm snapd-selinux-2.58.3-1.el9.noarch.rpm snapd-2.58.3-1.el9.x86_64.rpm
```

Running `snap` returns help commands as expected

Run `(sudo) snap install snap-store-proxy` returns:
```
error: system does not fully support snapd: cannot mount squashfs image using "squashfs": mount:
/tmp/syscheck-mountpoint-1357066368: wrong fs type, bad option, bad superblock on
/dev/loop0, missing codepage or helper program, or other error.

```
#### 2. Build from source

```
sudo dnf install -y git libseccomp-devel xfsprogs-devel libcap-devel go
git clone https://github.com/snapcore/snapd.git
cd snapd/
mkdir -p /tmp/build
go build -o /tmp/build ./...
cd /tmp/build
sudo ./snapd
```

Log output
```
2023/11/30 11:32:10.048397 overlord.go:271: Acquiring state lock file
2023/11/30 11:32:10.048717 overlord.go:276: Acquired state lock file
2023/11/30 11:32:10.056725 patch.go:64: Patching system state level 6 to sublevel 1...
2023/11/30 11:32:10.059219 patch.go:64: Patching system state level 6 to sublevel 2...
2023/11/30 11:32:10.061908 patch.go:64: Patching system state level 6 to sublevel 3...
2023/11/30 11:32:10.071653 daemon.go:247: started snapd/2.58+git1507.g3a88dc38ca (series 16; classic; devmode) amzn/2023 (amd64) linux/6.1.61-85.141.amzn2023.x8.
2023/11/30 11:32:10.116956 main.go:125: system does not fully support snapd: cannot mount squashfs image using "squashfs": mount: /tmp/syscheck-mountpoint-236683182: wrong fs type, bad option, bad superblock on /dev/loop0, missing codepage or helper program, or other error.
2023/11/30 11:32:10.117119 daemon.go:340: adjusting startup timeout by 30s (pessimistic estimate of 30s plus 5s per snap)
2023/11/30 11:32:10.118420 backends.go:58: AppArmor status: apparmor not enabled
2023/11/30 11:32:10.132644 system_key.go:254: running from non-installed location /tmp/build/snapd: ignoring system-key
2023/11/30 11:32:10.132729 helpers.go:146: error trying to compare the snap system key: system-key versions not comparable
2023/11/30 11:32:15.153860 daemon.go:519: gracefully waiting for running hooks
2023/11/30 11:32:15.153887 daemon.go:521: done waiting for running hooks
2023/11/30 11:32:18.154312 overlord.go:515: Released state lock file
daemon stop requested to wait for socket activation
```