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before unmounting /proc, check if /proc/sys/fs/binfmt_misc is mounted

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Johannes 'josch' Schauer 2019-12-02 23:54:48 +01:00
parent 6227bb2580
commit 394731102a
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 25 additions and 0 deletions
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@ -137,6 +137,26 @@ sub error {
}
}
# check whether a directory is mounted by comparing the device number of the
# directory itself with its parent
sub is_mountpoint($) {
my $dir = shift;
if (! -e $dir) {
return 0;
}
my @a = stat "$dir/.";
my @b = stat "$dir/..";
# if the device number is different, then the directory must be mounted
if ($a[0] != $b[0]) {
return 1;
}
# if the inode number is the same, then the directory must be mounted
if ($a[1] == $b[1]) {
return 1;
}
return 0;
}
# tar cannot figure out the decompression program when receiving data on
# standard input, thus we do it ourselves. This is copied from tar's
# src/suffix.c
@ -850,6 +870,11 @@ sub run_chroot(&$) {
}
if ($options->{mode} eq 'root') {
push @cleanup_tasks, sub {
# some maintainer scripts mount additional stuff into /proc
# which we need to unmount beforehand
if (is_mountpoint("$options->{root}/proc/sys/fs/binfmt_misc")) {
0 == system('umount', "$options->{root}/proc/sys/fs/binfmt_misc") or error "umount /proc/sys/fs/binfmt_misc failed: $?";
}
0 == system('umount', "$options->{root}/proc") or error "umount /proc failed: $?";
};
0 == system('mount', '-t', 'proc', 'proc', "$options->{root}/proc") or error "mount /proc failed: $?";