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zdtm: fix a race condition during concurrent execution of tests

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When tests are executed concurrently all of them use
the same root, so libraries must be copied atomically.

Without this patch we can get errors like this:
cp: cannot create regular file ‘/tmp/criu-root.m45u5Y/lib64/ld-linux-x86-64.so.2’: File exists

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2013-08-30 15:36:52 +04:00 • committed by Pavel Emelyanov
parent 7d8ed36c33
commit 6201096cea
1 changed files with 29 additions and 7 deletions
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36
test/zdtm.sh
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@ -223,6 +223,7 @@ construct_root()
local libdir=$root/lib
local libdir2=$root/lib64
local tmpdir=$root/tmp
local lname, tname
mkdir -p $root/bin
cp $ps_path $root/bin
@ -242,13 +243,34 @@ construct_root()
# /lib/ld-linux-armhf.so.3 (0xb6f0b000)
for i in `ldd $test_path $ps_path | grep -P '^\s' | grep -v vdso | sed "s/.*=> //" | awk '{ print $1 }'`; do
local lib=`basename $i`
[ -f $libdir/$lib ] && continue ||
[ -f $i ] && cp $i $libdir && cp $i $libdir2 && continue ||
[ -f /lib64/$i ] && cp /lib64/$i $libdir && cp /lib64/$i $libdir2 && continue ||
[ -f /usr/lib64/$i ] && cp /usr/lib64/$i $libdir && cp /usr/lib64/$i $libdir2 && continue ||
[ -f /lib/x86_64-linux-gnu/$i ] && cp /lib/x86_64-linux-gnu/$i $libdir && cp /lib/x86_64-linux-gnu/$i $libdir2 && continue ||
[ -f /lib/arm-linux-gnueabi/$i ] && cp /lib/arm-linux-gnueabi/$i $libdir && cp /lib/arm-linux-gnueabi/$i $libdir2 && continue || echo "Failed at " $i && return 1
local ldir, lib=`basename $i`
[ -f $libdir2/$lib ] && continue # fast path
if [ -f $i ]; then
lname=$i
elif [ -f /lib64/$i ]; then
lname=/lib64/$i
elif [ -f /usr/lib64/$i ]; then
lname=/usr/lib64/$i
elif [ -f /lib/x86_64-linux-gnu/$i ]; then
lname=/lib/x86_64-linux-gnu/$i
elif [ -f /lib/arm-linux-gnueabi/$i ]; then
lname=/lib/arm-linux-gnueabi/$i
else
echo "Failed at " $i;
return 1
fi
# When tests are executed concurrently all of them use the same root,
# so libraries must be copied atomically.
for ldir in "$libdir" "$libdir2"; do
tname=$(mktemp $ldir/lib.XXXXXX)
cp -pf $lname $tname &&
mv -n $tname $ldir/$lib || return 1
[ -f $tname ] && unlink $tname
done
done
# make 'tmp' dir under new root