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allow empty lost+found directory in target directory

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Johannes 'josch' Schauer 2018-11-20 08:34:13 +01:00
parent 1730a17286
commit 16d2a4a8d9
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 28 additions and 7 deletions
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35
mmdebstrap
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@ -1616,14 +1616,35 @@ sub main() {
if (!-d $options->{root}) {
die "$options->{root} exists and is not a directory";
}
opendir(my $dh, $options->{root}) or die "Can't opendir($options->{root}): $!";
# Attempt reading the directory thrice. If the third time succeeds,
# then it has more entries than just "." and ".." and must thus not
# be empty.
readdir $dh;
readdir $dh;
# check if the directory is empty or contains nothing more than an
# empty lost+found directory. The latter exists on freshly created
# ext3 and ext4 partitions.
# rationale for requiring an empty directory: https://bugs.debian.org/833525
die "$options->{root} is not empty" if (readdir $dh);
opendir(my $dh, $options->{root}) or die "Can't opendir($options->{root}): $!";
while (my $entry = readdir $dh) {
# skip the "." and ".." entries
next if $entry eq ".";
next if $entry eq "..";
# if the entry is a directory named "lost+found" then skip it
# if it's empty
if ($entry eq "lost+found" and -d "$options->{root}/$entry") {
opendir(my $dh2, "$options->{root}/$entry");
# Attempt reading the directory thrice. If the third time
# succeeds, then it has more entries than just "." and ".."
# and must thus not be empty.
readdir $dh2;
readdir $dh2;
# rationale for requiring an empty directory:
# https://bugs.debian.org/833525
if (readdir $dh2) {
die "$options->{root} contains a non-empty lost+found directory";
}
closedir($dh2);
} else {
die "$options->{root} is not empty";
}
}
closedir($dh);
} else {
make_path($options->{root}) or die "cannot create root: $!";
}