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authorPascal Terjan <pterjan@mandriva.org>2010-01-12 14:02:24 +0000
committerPascal Terjan <pterjan@mandriva.org>2010-01-12 14:02:24 +0000
commitc9caf51ec391bed1446ae5f27ed02c6283e7560f (patch)
tree32ffc6a20942d26a7f1461a5e4397921e74150e6 /lib/MDK/Common/System.pm
parent5971b5dcc8d0a38ebdfd628153cec525b0d1f8b8 (diff)
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fix whereis_binary to work on absolute symlinks inside chroot1.2.24
Diffstat (limited to 'lib/MDK/Common/System.pm')
-rw-r--r--lib/MDK/Common/System.pm22
1 files changed, 21 insertions, 1 deletions
diff --git a/lib/MDK/Common/System.pm b/lib/MDK/Common/System.pm
index 776c888..eac08ee 100644
--- a/lib/MDK/Common/System.pm
+++ b/lib/MDK/Common/System.pm
@@ -319,6 +319,17 @@ sub availableRamMB() { 4 * MDK::Common::Math::round((-s '/proc/kcore') / 1024 /
sub gettimeofday() { my $t = pack "LL"; syscall_('gettimeofday', $t, 0) or die "gettimeofday failed: $!\n"; unpack("LL", $t) }
sub unix2dos { local $_ = $_[0]; s/\015$//mg; s/$/\015/mg; $_ }
+sub expandLinkInChroot {
+ my ($file, $prefix) = @_;
+ my $l = readlink "$prefix$file";
+ return unless $l;
+ return $l if $l =~ /^\//;
+ my $path = $file;
+ $path =~ s!/[^/]*$!!;
+ $path .= "/$l";
+ return $path;
+}
+
sub whereis_binary {
my ($prog, $o_prefix) = @_;
if ($prog =~ m!/!) {
@@ -327,7 +338,16 @@ sub whereis_binary {
}
foreach (split(':', $ENV{PATH})) {
my $f = "$_/$prog";
- -x "$o_prefix$f" and return $f;
+ my $links = 0;
+ my $l = $f;
+ while ( -l "$o_prefix$l" ){
+ $l = expandLinkInChroot($l, $o_prefix);
+ if ($links++ > 16) {
+ warn qq(symlink recursion too deep in whereis_binary\n);
+ return;
+ }
+ }
+ -x "$o_prefix$l" and return $f;
}
}