But this seems to work kerrin@kerrin-HP-Z620-Workstation:~/ce_build$ echo "kvm_intel xxx" | grep -q -e ^kvm_amd -e ^kvm_intel; echo $? 0
-- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to bash in Ubuntu. https://bugs.launchpad.net/bugs/1394136 Title: if statement with pipe to grep randomly fails if pipefail is set Status in “bash” package in Ubuntu: Confirmed Bug description: The following bash script will fail randomly on trusty but when tested on saucy it worked all the time. On the system we test we have kvm installed and the if statement should evaluate to false and we should see ten PASS lines and no Error. And this should happen all the time. ====== #!/bin/bash set -eu set -o pipefail if ! lsmod | grep -q -e ^kvm_intel -e ^kvm_amd ; then echo 'Error: check that virtualisation is enabled in your BIOS' else echo "PASS" fi ======= As can be seen if I run it 10 times I get 2 PASS and 8 failures ======= kerrin@kerrin-HP-Z620-Workstation:~/ce_build$ for i in $(seq 0 9) ; do bash test-simple.bash ; done PASS PASS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS Error: check that virtualisation is enabled in your BIOS ======= Now if I turn off the pipefail then the script passes all the time and just prints out 10 PASS lines. The script uses bash, grep and lsmod and I have the following versions on trusty of them kerrin@kerrin-HP-Z620-Workstation:~/ce_build$ dpkg -l | grep bash ii bash 4.3-7ubuntu1.5 amd64 GNU Bourne Again SHell ii bash-completion 1:2.1-4 all programmable completion for the bash shell ii command-not-found 0.3ubuntu12 all Suggest installation of packages in interactive bash sessions kerrin@kerrin-HP-Z620-Workstation:~/ce_build$ dpkg -l | grep grep ii grep 2.16-1 amd64 GNU grep, egrep and fgrep kerrin@kerrin-HP-Z620-Workstation:~/ce_build$ dpkg -l | grep kmod ii kmod 15-0ubuntu6 amd64 tools for managing Linux kernel modules ii libkmod2:amd64 15-0ubuntu6 amd64 libkmod shared library ii module-init-tools 15-0ubuntu6 all transitional dummy package (module-init-tools to kmod) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bash/+bug/1394136/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
