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- A complete boot log (both early userspace and kernel) is preserved
and can be obtained via `dmesg`
- Messages are ordered and timestamped, so the log is more clear
Example:
[ 5.616453] [U] * /sbin/mount.cifs //10.42.0.4/dist/slinux-9.1-x86_64.iso /image -oguest,vers=1.0
[ 5.616932] CIFS: Attempting to mount //10.42.0.4/dist/slinux-9.1-x86_64.iso
[ 5.616940] CIFS: VFS: Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers
[ 5.621647] CIFS: VFS: Could not allocate crypto cmac(aes)
[ 5.623263] CIFS: VFS: Could not allocate crypto cmac(aes)
[ 5.626645] [U] mount error(20): Not a directory
[ 5.626649] [U] Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
[ 5.626747] [U] * assuming ISO image, Samba path://10.42.0.4/dist
[ 5.626749] [U] * mounting //10.42.0.4/dist on /image as type cifs
[ 5.626753] [U] * cifsmount: attempting to mount //10.42.0.4/dist with default protocol version
[ 5.626758] [U] * /sbin/mount.cifs //10.42.0.4/dist /image -oguest
[ 5.627299] CIFS: Attempting to mount //10.42.0.4/dist
[ 5.629106] CIFS: VFS: Could not allocate crypto cmac(aes)
[ 5.631290] CIFS: VFS: Could not allocate crypto cmac(aes)
[ 5.638261] CIFS: VFS: \\10.42.0.4 generate_key: crypto alloc failed
[ 5.638264] CIFS: VFS: \\10.42.0.4 Send error in SessSetup = -2
[ 5.638275] CIFS: VFS: cifs_mount failed w/return code = -2
[ 5.638294] [U] mount error(2): No such file or directory
[ 5.638296] [U] Refer to the mount.cifs(8) manual page (e.g. man mount.cifs) and kernel log messages (dmesg)
[ 5.638376] [U] * cifsmount: failed, retrying with vers=1.0
[ 5.638383] [U] * /sbin/mount.cifs //10.42.0.4/dist /image -oguest,vers=1.0
[ 5.639582] CIFS: Attempting to mount //10.42.0.4/dist
[ 5.639590] CIFS: VFS: Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers
[ 5.649559] [U] * assuming ISO image, path:/image/slinux-9.1-x86_64.iso
Related: #40554
So it's easier to debug a failed boot.
While at it avoid closing stdin, since a printf might inject
unexpected input into a wrong place (a socket with FD 0).
Redirect stdin from /dev/null instead.
While at it improved error handling a bit (fork, waitpid can fail)
nfsmount: same here
Related: #40554
