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convert gpg keyring processing to less nesting and abort earlier if possible

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Johannes 'josch' Schauer 2020-01-22 00:29:38 +01:00
parent c26ec4d6fc
commit ae15fe3d9f
Signed by untrusted user: josch
GPG key ID: F2CBA5C78FBD83E1
1 changed files with 88 additions and 86 deletions
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174
mmdebstrap
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@ -3183,98 +3183,100 @@ sub main() {
) {
$keyring
= '/usr/share/keyrings/debian-archive-keyring.gpg';
} else {
last;
}
# we can only check if we need the signed-by entry if we u
# automatically chosen keyring exists
if (defined $keyring && -e $keyring) {
# we can only check key material if gpg is installed
my $gpghome = tempdir(
"mmdebstrap.gpghome.XXXXXXXXXXXX",
TMPDIR => 1,
CLEANUP => 1
);
my @gpgcmd = (
'gpg', '--quiet',
'--ignore-time-conflict', '--no-options',
'--no-default-keyring', '--homedir',
$gpghome, '--no-auto-check-trustdb',
'--trust-model', 'always'
);
my ($ret, $fh, $message);
{
# change warning handler to prevent message
# Can't exec "gpg": No such file or directory
local $SIG{__WARN__} = sub { $message = shift; };
$ret = open $fh, '-|', @gpgcmd, '--version';
if (!defined $keyring || !-e $keyring) {
last;
}
# we can only check key material if gpg is installed
my $gpghome = tempdir(
"mmdebstrap.gpghome.XXXXXXXXXXXX",
TMPDIR => 1,
CLEANUP => 1
);
my @gpgcmd = (
'gpg', '--quiet',
'--ignore-time-conflict', '--no-options',
'--no-default-keyring', '--homedir',
$gpghome, '--no-auto-check-trustdb',
'--trust-model', 'always'
);
my ($ret, $fh, $message);
{
# change warning handler to prevent message
# Can't exec "gpg": No such file or directory
local $SIG{__WARN__} = sub { $message = shift; };
$ret = open $fh, '-|', @gpgcmd, '--version';
}
# we only want to check if the gpg command exists
close $fh;
if ($? != 0 || !defined $ret || defined $message) {
info "gpg --version failed: cannot determine the right"
. " signed-by value";
last;
}
# find all the fingerprints of the keys apt currently
# knows about
my @keyringopts = ();
opendir my $dh, "$options->{apttrustedparts}"
or error "cannot read $options->{apttrustedparts}";
while (my $filename = readdir $dh) {
if ($filename !~ /\.(asc|gpg)$/) {
next;
}
# we only want to check if the gpg command exists
close $fh;
if ($? == 0 && defined $ret && !defined $message) {
# find all the fingerprints of the keys apt currently
# knows about
my @aptfingerprints = ();
my $collect_fingerprints = sub {
my $filename = shift;
open my $fh, '-|', @gpgcmd, '--keyring',
$filename, '--with-colons',
'--list-keys' // error "failed to fork(): $!";
while (my $line = <$fh>) {
if ($line !~ /^fpr:::::::::([^:]+):/) {
next;
}
push @aptfingerprints, $1;
}
close $fh;
};
opendir my $dh, "$options->{apttrustedparts}"
or error "cannot read $options->{apttrustedparts}";
while (my $filename = readdir $dh) {
if ($filename !~ /\.(asc|gpg)$/) {
next;
}
$collect_fingerprints->(
"$options->{apttrustedparts}/$filename");
}
if (-e $options->{apttrusted}) {
$collect_fingerprints->($options->{apttrusted});
}
# check if all fingerprints from the keyring that we
# guessed are known by apt and only add signed-by
# option if that's not the case
my @suitefingerprints = ();
open my $suitefh, '-|', @gpgcmd, '--keyring',
$keyring, '--with-colons',
'--list-keys' // error "failed to fork(): $!";
while (my $line = <$suitefh>) {
if ($line !~ /^fpr:::::::::([^:]+):/) {
next;
}
# if this fingerprint is not known by apt, then we
# need to add the signed-by option
if (none { $_ eq $1 } @aptfingerprints) {
$signedby = " [signed-by=\"$keyring\"]";
last;
}
}
close $suitefh;
if ($? != 0) {
error "gpg failed";
}
} else {
info "gpg --version failed: cannot determine the right"
. " signed-by value";
push @keyringopts, '--keyring',
"$options->{apttrustedparts}/$filename";
}
if (-e $options->{apttrusted}) {
push @keyringopts, '--keyring', $options->{apttrusted};
}
my @aptfingerprints = ();
if (scalar @keyringopts == 0) {
$signedby = " [signed-by=\"$keyring\"]";
last;
}
open my $fh, '-|', @gpgcmd, @keyringopts, '--with-colons',
'--list-keys' // error "failed to fork(): $!";
while (my $line = <$fh>) {
if ($line !~ /^fpr:::::::::([^:]+):/) {
next;
}
remove_tree($gpghome, { error => \my $err });
if (@$err) {
for my $diag (@$err) {
my ($file, $message) = %$diag;
if ($file eq '') {
warning "general error: $message";
} else {
warning "problem unlinking $file: $message";
}
}
push @aptfingerprints, $1;
}
close $fh;
if ($? != 0) {
error "gpg failed";
}
if (scalar @aptfingerprints == 0) {
$signedby = " [signed-by=\"$keyring\"]";
last;
}
# check if all fingerprints from the keyring that we guessed
# are known by apt and only add signed-by option if that's not
# the case
my @suitefingerprints = ();
open my $suitefh, '-|', @gpgcmd, '--keyring', $keyring,
'--with-colons',
'--list-keys' // error "failed to fork(): $!";
while (my $line = <$suitefh>) {
if ($line !~ /^fpr:::::::::([^:]+):/) {
next;
}
# if this fingerprint is not known by apt, then we need to
# add the signed-by option
if (none { $_ eq $1 } @aptfingerprints) {
$signedby = " [signed-by=\"$keyring\"]";
last;
}
}
close $suitefh;
if ($? != 0) {
error "gpg failed";
}
}
if (scalar @ARGV > 0) {