[Bug] cannot run 'apt-get install' #350
Comments
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Running strace as @hallyn suggested left me with output like this: I can reproduce the problem with a simple test: #include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int main(int argc, char* argv[]) {
int fd = 0, errors = 0;
for (int i=1; i<argc;i++) {
fd = openat(AT_FDCWD, argv[i], O_RDWR|O_CREAT|O_NOFOLLOW, 0640);
if (fd < 0) {
printf("%s: %d: %s\n", argv[i], fd, strerror(errno));
errors++;
} else {
printf("%s: %d\n", argv[i], fd);
}
close(fd);
}
return errors;
}I can run that via stacker.yaml with |
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I can fix this for real root by supporting kernel mounts of squashfs like this: diff --git a/squashfs/squashfs.go b/squashfs/squashfs.go
index 17ded43..d0a1241 100644
--- a/squashfs/squashfs.go
+++ b/squashfs/squashfs.go
@@ -168,7 +168,15 @@ func ExtractSingleSquash(squashFile string, extractDir string, storageType strin
return err
}
- if p := which("squashfuse"); p != "" {
+ if realuid := os.Getenv("STACKER_REAL_UID"); realuid == "0" {
+ log.Debugf("Extracting %s -> %s with kernel mount", squashFile, extractDir)
+ cmd := exec.Command("mount", "-oloop,ro", squashFile, extractDir)
+ cmd.Stdout = os.Stdout
+ cmd.Stderr = os.Stderr
+ cmd.Stdin = nil
+ return cmd.Run()
+ return cmd.Start()
+ } else if p := which("squashfuse"); p != "" {
// given extractDir of path/to/some/dir[/], log to path/to/some/.dir-squashfs.log
extractDir := strings.TrimSuffix(extractDir, "/") |
Can you show the squashfuse log for that? |
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I compiled the following program: I created a squashfs file containing: I created a userns and mntns, mounted the s.squashfs (built from This is on 5.15.0-56-generic . I wonder what's going on with the stacker build! |
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Oh, duh - it's what happens when the file exists: root@jerom ~/delme/squashfuse$ ~/test/openat dest/a/ab So, why? |
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Just O_CREATE works, but O_CREATE|O_RDWR does not. |
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running squashfuse with -o allow_root does not help. Debug mode gives me: |
smoser
changed the title
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I opened a squashfuse issue with a recreate vasi/squashfuse#80 |
Thanks - i was still looking through the closed issue for a hint. I'm thinking I'll try and reproduce this in a lucid ubuntu image with mainline kernel. It does seem just as likely that the villain here is overlay, not directly squashfuse. |
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I've been misreading my squashfuse log file. The open arguments did not cause the 'Function not implemented'. It is an opcode 46 that is done immediately after: I had been thinking that was part of the previous open operation. |
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tldr; This is fixed in squashfuse and libfuse3 packages available in ppa:puzzleos/dev. Some status here. I found that
I filed debian bug #1025706 requesting it be built against fuse3. I then:
Binaries are available in ppa:puzzleos/dev An upload to debian or ubuntu (lunar) that linked against fuse3 will fix this (fuse3 in lunar is sufficient, but probably not in kinetic and definitely not in jammy). |
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closing this, it is fixed see comment above. |
stacker version
v0.30.1-5-g1346183 liblxc 074b9fe66304fb05e07554d01353c8d2e53e392a
Describe the bug
No response
To reproduce
Given this stacker.yaml
This will work fine:
But attempting squashfs will fail as shown:
Expected behavior
Expected squash to work as tar.
Screenshots
No response
Additional context
I don't have an easy way to give a reference docker container. Those on zothub are not built with new enough stacker to have xattrs removed.
can probably attach a tarball.
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