[Podman] Re: Why does Podman update the "Change" timestamp on files shared between host and guest ?

On 6/28/22 18:48, Jacob Kroon wrote: > Hi Daniel, > > On 6/28/22 16:23, Daniel Walsh wrote: >> On 6/28/22 03:15, Jacob Kroon wrote: >>> Hi, >>> >>> I'm using Podman in my build environment. As part of the build I >>> bind a directory from the host to a directory in the container. >>> Even though the guest doesn't touch the file in any way, afterwards >>> I can see that the file's "Change" timestamp has been updated, so I >>> am assuming it is podman that does this. >>> >>> According to >>> https://unix.stackexchange.com/questions/2464/timestamp-modification-time... >>> >>> the "Change" timestamp is described as "the last time meta data of >>> the file was changed (e.g. permissions)". >>> >>> I am wondering what meta data it is that podman changes, and if it >>> can be avoided somehow ? (Mainly because it tricks git/gitk into >>> thinking something might have changed). >>> > > [cut] > >> >> Could you mount the volume :ro inside of the container and see if >> the same thing happens? >> > > Yup, same thing happens even if I mount it with :ro. > >> If it still happens, then we know it is Podman making the change as >> opposed to the processes inside of the container. >> >> You could also  bind mount the volume readonly on itself, before >> using podman to see if podman throws an error. > > I haven't tried this, let me know if this would be of help and I will > give it a shot. > I ran it through strace and grepped for a dummy file "foobar" that I created and got this: > [pid  2886] lsetxattr("/home/jkroon/Projects/foobar-linux/foobar", > "security.selinux", "system_u:object_r:container_file"..., 37, 0 > <unfinished ...> I'll try to see if I can figure out how to get gdb to break on lsetxattr() with that argument. My host is an up2date Fedora 36. Also, I'm using --userns=keep-id in case that matters. Regards Jacob _______________________________________________ Podman mailing list -- podman(a)lists.podman.io To unsubscribe send an email to podman-leave(a)lists.podman.io