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Installing gentoo in chroot I found that commands like mount and df doesn't work: they try to read file /etc/mtab (which of course is empty).

Can I (for future use) setup or even recompile them so, that they won't read /etc/mtab, taking all needed info from /proc?

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2 Answers 2

df and mount are based on *mntent (ex getmntent) functions, based on /etc/mtab and /etc/fstab. You can patch these tools, but you should simply copy or symlink /proc/mounts to /etc/mtab.

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Indeed: I look at /etc/mtab in my archlinux, it is a symlink to /proc/self/mounts. Is there any difference between /proc/self/mounts and /proc/mounts? –  Eddy_Em Mar 27 '13 at 8:01
/proc/self is a symlink to /proc/CURPID/. So if you do an ls /proc, it's link to ls current PID. And /proc/mounts is a symlink to /proc/self/mounts. So basicly it's the same file. –  GHugo Mar 27 '13 at 10:47
thanks for explanation. If I'd have look at /proc/mounts, I wouldn't ask previous question. –  Eddy_Em Mar 27 '13 at 10:53

Don't do that: instead, symlink /proc/mounts to /etc/mtab instead, that solve your problem as well.

And notice that in a chrooted environment, you only need a minimal mount table, i.e /sys, /proc, / etc.

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