+sub _read_git_config_perm {
+ my ($self) = @_;
+ chomp(my $perm = $self->git->qx('config', 'core.sharedRepository'));
+ $perm;
+}
+
+sub _git_config_perm {
+ my $self = shift;
+ my $perm = scalar @_ ? $_[0] : _read_git_config_perm($self);
+ return PERM_UMASK if (!defined($perm) || $perm eq '');
+ return PERM_UMASK if ($perm eq 'umask');
+ return PERM_GROUP if ($perm eq 'group');
+ if ($perm =~ /\A(?:all|world|everybody)\z/) {
+ return PERM_EVERYBODY;
+ }
+ return PERM_GROUP if ($perm =~ /\A(?:true|yes|on|1)\z/);
+ return PERM_UMASK if ($perm =~ /\A(?:false|no|off|0)\z/);
+
+ my $i = oct($perm);
+ return PERM_UMASK if ($i == PERM_UMASK);
+ return PERM_GROUP if ($i == OLD_PERM_GROUP);
+ return PERM_EVERYBODY if ($i == OLD_PERM_EVERYBODY);
+
+ if (($i & 0600) != 0600) {
+ die "core.sharedRepository mode invalid: ".
+ sprintf('%.3o', $i) . "\nOwner must have permissions\n";
+ }
+ ($i & 0666);
+}
+
+sub _umask_for {
+ my ($perm) = @_; # _git_config_perm return value
+ my $rv = $perm;
+ return umask if $rv == 0;
+
+ # set +x bit if +r or +w were set
+ $rv |= 0100 if ($rv & 0600);
+ $rv |= 0010 if ($rv & 0060);
+ $rv |= 0001 if ($rv & 0006);
+ (~$rv & 0777);
+}
+
+sub with_umask {
+ my ($self, $cb) = @_;
+ my $old = umask $self->{umask};
+ my $rv = eval { $cb->() };
+ my $err = $@;
+ umask $old;
+ die $err if $err;
+ $rv;
+}
+
+sub umask_prepare {
+ my ($self) = @_;
+ my $perm = _git_config_perm($self);
+ my $umask = _umask_for($perm);
+ $self->{umask} = $umask;
+}
+