{"action":"created","comment":{"url":"https://api.github.com/repos/openshift/origin/pulls/comments/72272412","id":72272412,"diff_hunk":"@@ -193,23 +193,14 @@ function os::cmd::internal::expect_exit_code_run_grep() {\n \n \tlocal test_result=0\n \tif [[ -n \"${grep_args}\" ]]; then\n-\t\ttest_result=$( os::cmd::internal::run_collecting_output 'os::cmd::internal::get_results | grep -Eq \"${grep_args}\"'; echo $? )\n-\n+\t\ttest_result=$( os::cmd::internal::run_collecting_output \"grep -Eq '${grep_args}' <(os::cmd::internal::get_results)\"; echo $? )","path":"hack/lib/cmd.sh","position":18,"original_position":18,"commit_id":"4e486a2cab4ba55fb1926f9c15793a0ccde7345a","original_commit_id":"4e486a2cab4ba55fb1926f9c15793a0ccde7345a","user":{"login":"stevekuznetsov","id":7328370,"avatar_url":"https://avatars.githubusercontent.com/u/7328370?v=3","gravatar_id":"","url":"https://api.github.com/users/stevekuznetsov","html_url":"https://github.com/stevekuznetsov","followers_url":"https://api.github.com/users/stevekuznetsov/followers","following_url":"https://api.github.com/users/stevekuznetsov/following{/other_user}","gists_url":"https://api.github.com/users/stevekuznetsov/gists{/gist_id}","starred_url":"https://api.github.com/users/stevekuznetsov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevekuznetsov/subscriptions","organizations_url":"https://api.github.com/users/stevekuznetsov/orgs","repos_url":"https://api.github.com/users/stevekuznetsov/repos","events_url":"https://api.github.com/users/stevekuznetsov/events{/privacy}","received_events_url":"https://api.github.com/users/stevekuznetsov/received_events","type":"User","site_admin":false},"body":"They were technically correct both times since the `os::cmd::internal::run_collecting_output` does an `eval` ... but it's better practice to have the args (*e.g.* `${grep_args}`) expand in the shell before the `eval` so things like the stack trace can better signal to us what exactly was going on.","created_at":"2016-07-26T15:24:49Z","updated_at":"2016-07-26T15:24:49Z","html_url":"https://github.com/openshift/origin/pull/10040#discussion_r72272412","pull_request_url":"https://api.github.com/repos/openshift/origin/pulls/10040","_links":{"self":{"href":"https://api.github.com/repos/openshift/origin/pulls/comments/72272412"},"html":{"href":"https://github.com/openshift/origin/pull/10040#discussion_r72272412"},"pull_request":{"href":"https://api.github.com/repos/openshift/origin/pulls/10040"}}},"pull_request":{"url":"https://api.github.com/repos/openshift/origin/pulls/10040","id":78866399,"html_url":"https://github.com/openshift/origin/pull/10040","diff_url":"https://github.com/openshift/origin/pull/10040.diff","patch_url":"https://github.com/openshift/origin/pull/10040.patch","issue_url":"https://api.github.com/repos/openshift/origin/issues/10040","number":10040,"state":"open","locked":false,"title":"Use anonyous FIFO instead of pipe in os::cmd output test","user":{"login":"stevekuznetsov","id":7328370,"avatar_url":"https://avatars.githubusercontent.com/u/7328370?v=3","gravatar_id":"","url":"https://api.github.com/users/stevekuznetsov","html_url":"https://github.com/stevekuznetsov","followers_url":"https://api.github.com/users/stevekuznetsov/followers","following_url":"https://api.github.com/users/stevekuznetsov/following{/other_user}","gists_url":"https://api.github.com/users/stevekuznetsov/gists{/gist_id}","starred_url":"https://api.github.com/users/stevekuznetsov/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/stevekuznetsov/subscriptions","organizations_url":"https://api.github.com/users/stevekuznetsov/orgs","repos_url":"https://api.github.com/users/stevekuznetsov/repos","events_url":"https://api.github.com/users/stevekuznetsov/events{/privacy}","received_events_url":"https://api.github.com/users/stevekuznetsov/received_events","type":"User","site_admin":false},"body":"Previously, the output of the last command was searched by\r\n`grep -q`. When `grep -q` finds the text it is looking for,\r\nit exits immediately with exit code 0. If the command feed-\r\ning `grep -q` with input is still running, it will write\r\nto a pipe that has no readers, and Bash will terminate the\r\nproducer process with a SIGPIPE as this is invalid behavior.\r\n\r\nInstead of using a `cat | grep` approach for searching in\r\nos::cmd, we can therefore use `grep <(file)` approach, which\r\ncreates an anonymous FIFO to pass the data and therefore\r\nguards against this sort of error.\r\n\r\nSigned-off-by: Steve Kuznetsov <skuznets@redhat.com>\r\n\r\nfixes 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