forked from josch/mmdebstrap
check whether newuidmap and newgidmap are available
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1 changed files with 26 additions and 0 deletions
26
mmdebstrap
26
mmdebstrap
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@ -109,6 +109,16 @@ sub test_unshare() {
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if (($? >> 8) != 0) {
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return 0;
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}
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# if newuidmap and newgidmap exist, the exit status will be 1 when
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# executed without parameters
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system "newuidmap 2>/dev/null";
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if (($? >> 8) != 1) {
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return 0;
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}
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system "newgidmap 2>/dev/null";
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if (($? >> 8) != 1) {
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return 0;
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}
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return 1;
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}
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@ -1357,6 +1367,22 @@ sub main() {
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if ($EFFECTIVE_USER_ID == 0) {
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print STDERR "I: cannot use unshare mode when executing as root\n";
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}
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system "newuidmap 2>/dev/null";
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if (($? >> 8) != 1) {
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if (($? >> 8) == 127) {
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print STDERR "I: cannot find newuidmap\n";
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} else {
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print STDERR "I: newuidmap returned unknown exit status\n";
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}
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}
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system "newgidmap 2>/dev/null";
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if (($? >> 8) != 1) {
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if (($? >> 8) == 127) {
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print STDERR "I: cannot find newgidmap\n";
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} else {
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print STDERR "I: newgidmap returned unknown exit status\n";
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}
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}
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my $procfile = '/proc/sys/kernel/unprivileged_userns_clone';
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open(my $fh, '<', $procfile) or die "failed to open $procfile: $!";
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chomp(my $content = do { local $/; <$fh> });
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