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* test: term: When checking if status line is a number, hide errorsStefano Brivio2022-09-141-1/+1
| | | | | | | | | | We use the [ "$x" -eq "$x" ] syntax to check if $x is a number. The behaviour is clearly implied by POSIX, but some shells might actually report the (intended) error, and dash floods script.log with "Illegal number" error messages. Hide them. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move perf.js report file to $LOGDIR/webDavid Gibson2022-09-131-1/+2
| | | | | | | | | The tests generate a performance report in $BASEPATH/perf.js and hooks/pre-push copies it to the website. To avoid cluttering the working directory, instead put perf.js in $LOGDIR/web, since it's a test output artefact. Update hooks/pre-push to copy from its new location. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move video processing files to $STATEBASEDavid Gibson2022-09-132-20/+25
| | | | | | | | | | | | | The asciinema video handling creates a number of temporary files (.uncat, .start, .stop) which currently go into the source tree. Put them in the temporary state directory to avoid clutter. The final processed output is now placed into test_logs/web/ along with the corresponding .js file with links, since they're essentially test artefacts. hooks/pre-push is updated to look for those files in the new location when updating the web site. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move pidfiles and nsholder sockets into state directoryDavid Gibson2022-09-131-33/+33
| | | | | | | Currently they go in the passt source tree with a fixed names, which means their presence can mess with subsequent test runs. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Store pcap files in $LOGDIR instead of /tmpDavid Gibson2022-09-131-8/+8
| | | | | | | The capture files are more or less a different form of log output from the tests, so place them in $LOGDIR. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move pause temporary file to state directoryDavid Gibson2022-09-131-2/+2
| | | | Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use paths in __STATEDIR__ instead of 'temp' and 'tempdir' directivesDavid Gibson2022-09-131-10/+0
| | | | | | | | | | | | Instead of using the 'temp' and 'tempdir' DSL directives to create temporary files, use fixed paths relative to __STATEDIR__. This has two advantages: 1) The files are automatically cleaned up if the tests fail (and even if that doesn't work they're easier to clean up manuall) 2) When debugging tests it's easier to figure out which of the temporary files are relevant to whatever's going wrong Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move context temporary files to state dirDavid Gibson2022-09-131-29/+32
| | | | | | | | | Currently the context command dispatch subsystem creates a bunch of temporary files in $LOGDIR, which is messy. Store them in $STATEDIR which is for precisely this purpose. The logs from each context still go into $LOGDIR. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Move passt_test_log_pipe to state directoryDavid Gibson2022-09-132-14/+14
| | | | | | | We use this fifo to send messages to the information pane. Put it in the state directory so it doesn't need its own cleanup. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Create common state directories for temporary filesDavid Gibson2022-09-133-1/+7
| | | | | | | | | | | | | | | | | | The test scripts create a bunch of temporary files to keep track of internal state. Some are made in /tmp with individual mktemp calls, some go in the passt source directory, and some go in $LOGDIR. This can sometimes make it messy to clean up after failed test runs. Start cleaning this up by creating a single "state" directory ($STATEBASE) in /tmp for all the state or temporary files used by a single test run. Clean it up automatically in cleanup() - except when DEBUG==1, because those files can be useful for debugging test script failures. We create subdirectories under $STATEBASE for each setup function, exposed as $STATESETUP. We also create subdirectories for each test script and expose those to the scripts as __STATEDIR__. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Remove unused variable FFMPEG_PID_FILEDavid Gibson2022-09-131-1/+0
| | | | | | FFPMPEG_PID_FILE is set (creating a temporary file), then never used. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use new-style command issue for passt_in_ns testsDavid Gibson2022-09-132-49/+34
| | | | | | | Put the pieces together to use the new style context based dispatch for the passt_in_pasta tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use context system for two_guests testsDavid Gibson2022-09-132-73/+57
| | | | | | | | Now that we have all the pieces we need for issuing commands both into namespaces and into guests, we can use those to convert the two_guests to using only the new style context command issue. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use context system for guest commandsDavid Gibson2022-09-134-11/+43
| | | | | | | | | | | | | | | Extends the context system in the test scripts to allow executing commands within a guest. Do this without requiring an existing network in the guest by using socat to run ssh via a vsock connection. We do need some additional "sleep"s in the tests, because the new faster dispatch means that sometimes we attempt to connect before socat has managed to listen. For now, only use this for the plain "passt" tests. The "passt_in_ns" and other tests have additional complications we still need to deal with. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Extend context system to run commands in namespace for pasta testsDavid Gibson2022-09-133-13/+29
| | | | | | | Extend the context system to allow commands to be run in a namespace created with unshare, and use it for the namespace used in the pasta tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use new-style contexts for passt pane in the pasta and passt testsDavid Gibson2022-09-132-16/+11
| | | | | | | | | | Convert the pasta and passt tests to use new-style context execution for the things that run in the "passt" frame. Don't touch the passt_in_ns or two_guests tests yet, because they run passt inside a namespace which introduces some additional complications we have yet to handle. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Issue host commands via context for most testsDavid Gibson2022-09-132-25/+42
| | | | | | | | | Convert most of the tests to use the new-style system for issuing commands for all host commands. We leave the distro tests for now: they use the same pane for both host and guest commands which we'll need some more things to deal with. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Integration of old-style pane execution and new context executionDavid Gibson2022-09-132-81/+120
| | | | | | | | | | | | | | | | We're creating a system for tests to more reliably execute commands in various contexts (e.g. host, guest, namespace). That transition is going to happen over a number of steps though, so in the meantime we need to deal with both the old-style issuing of commands via typing into and screen scraping tmux panels, and the new-style system for executing commands in context. Introduce some transitional helpers which will issue a command via context if the requested context is initialized, but will otherwise fall back to the old style tmux panel based method. Re-implement the various test DSL commands in terms of these new helpers. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Allow a tmux pane to watch commands executed in contextsDavid Gibson2022-09-131-0/+18
| | | | | | | | | | | | | | | | We're moving to a new way of the tests dispatching commands to running in contexts (host, guest, namespace, etc.). As we make this transition, though, we still want the user to be able to watch the commands running in a context, as they previously could from the commands issued in the pane. Add a helper to set up a pane to watch a context's log to allow this. In some cases we currently issue commands from several different logical contexts in the same pane, so allow a pane to watch several contexts at once. Also use tail's --retry option to allow starting the watch before we've initialized the context which will be useful in some cases. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Context execution helpersDavid Gibson2022-09-131-0/+80
| | | | | | | | | | | | | | | | | | For the tests, we need to run commands in various contexts: in the host, in a guest or in a namespace. Currently we do this by running each context in a tmux pane, and using tmux commands to type the commands into the relevant pane, then screen-scrape the output for the results if we need them. This is very fragile, because we have to make various assumptions to parse the output. Those can break if a shell doesn't have the prompt we expect, if the tmux pane is too small or in various other conditions. This starts some library functions for a new "context" system, that provides a common way to invoke commands in a given context, in a way that properly preserves stdout, stderr and the process return code. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Rewrite test_iperf3David Gibson2022-09-071-41/+27
| | | | | | | | | | | | | | | test_iperf3() is a pretty inscrutable mess of nested background processes. It has a number of ugly sleeps needed to wait for things to complete. Rewrite it to be cleaner: * Use the construct (a & b & wait) to run 'a' and 'b' in parallel, but then wait for them both to complete before continuing * This allows us to wait for both the server and client to finish, rather than sleeping * Use jq to do all the math we need to get the final result, rather than jq followed by some complicated 'bc' mangling Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Parameterize run time for throughput performance testsDavid Gibson2022-09-071-4/+6
| | | | | | | | | | | | Currently all the throughput tests are run for 30s. This is reflected in both the actual parameters given to the iperf commands, but also in the matching sleeps in test_iperf3. Allow this to be adjusted more easily with a new parameter to test_iperf3. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: Reflect new parameter in comment to test_iperf3()] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* test: Combine iperf3c and iperf3s into a single DSL commandDavid Gibson2022-09-071-47/+43
| | | | | | | | | | | | | | | | | These two commands in the DSL to run an iperf client and server are always used together, and some of the parameters must match between them. The iperf3s must also be run more or less immediately after iperf3c, since iperf3c will run a client in the background after a sleep and requires a server to be running before it will work. A bunch of things can be made cleaner if we make a single DSL command that runs both sides of the test. For now make the combined command work exactly like the two commands together did, warts and all. This does lose the ability for the DSL scripts to give additional options to the iperf3 server, but we weren't using that anyway. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Kill qemu by pidfile rather than ^CDavid Gibson2022-08-201-8/+12
| | | | | | | | | | | | | Currently in at least some of the testcases we kill qemu processes we're done with by issuing a Control-C to the tmux panel it's running in. That makes things harder as we try to move towards allowing "headless" testing without tmux. So, instead always use an explicit kill on a pid derived from a pidfile for killing qemu. Note that we don't need to remove the pidfiles afterwards, because qemu does that itself when terminated. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Use shutdown test for pastaDavid Gibson2022-08-201-3/+1
| | | | | | | | | For the passt and passt_in_ns tests we have a "shutdown" testcase that checks for any errors from the passt process we were using (including valgrind warnings). Do the same for pasta tests, so that we catch any error codes from the pasta process. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Rename slightly misleading "valgrind" testsDavid Gibson2022-08-201-2/+0
| | | | | | | | | | | | | | | | | | | The "valgrind" test cases are designed to pick up errors reported when passt is running under valgrind. But what it actually does is just kill the passt process, then see if it had a non-zero exit code. That means it will equally well pick up any other problems which caused passt to exit with an error status: either something detected within passt or as a result of passt being killed by an unexpected signal. The fact that the "valgrind" test is actually responsible for shutting down the passt process is non-obvious and can lead to problems when selectively running tests during debugging. Rename the "valgrind" tests to "shutdown" tests and run it regardless of whether we're using valgrind or not. This allows us to remove an ugly speacial case in the passt_in_ns teardown code. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Split setup/teardown functions for build and distro testsDavid Gibson2022-08-201-0/+15
| | | | | | | | | | | | Currently the build tests and distro tests share a common setup function. That works for now, but changes we want to make will mean they need slightly different setup, so split the setup functions in preparation. Currently, neither build nor distro tests have any teardown function. Again, future changes are going to mean we need to do some teardown, so create some empty for now teardown functions in preparation. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Remove unused *_XTERM variablesDavid Gibson2022-08-201-4/+0
| | | | | | | The DEMO_XTERM and CI_XTERM variables defined in test/lib/term aren't used anywhere. Remove them. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Clean up better after iperf testsDavid Gibson2022-07-221-1/+1
| | | | | | | | | | | | | The iperf based test commands create a bunch of .bw and .pid files for each iperf client and server. The server side .bw files are cleaned up afterwards, but the pid files are not, and none of the client side files are cleaned up. The latter doesn't really matter when the client is run on ephemeral guests, but sometimes we run it in a namespace that shares the filesystem with the host. Clean up all of these files after the tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Use dhclient --no-pid for namespaces in two_guests testsDavid Gibson2022-07-221-4/+4
| | | | | | | | | | Before starting the guests, these tests configure addresses in a pasta namespace using dhclient. However, because it's a user namespace, it's not running as "real" root and can't write to the dhclient pid file. This doesn't stop it working, but causes an ugly error message which we can avoid by using the --no-pid option. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove unnecessary ^D in passt_in_ns teardownDavid Gibson2022-07-221-2/+0
| | | | | | | | | | | | | | | | | teardown_passt_in_ns() sends a ^D to the NS pane, which appears to be intended to terminate the nsenter running there, leaving the namespace. However, we've also sent a ^D to the PASST pane which will exit the pasta instance which created the namespace. With the namespace destroyed the nsenter in the NS pane will be killed, so it does not need to be exited explicitly. In fact sending the extra ^D can be harmful, since it will exit the shell in which the nsenter was run, causing the whole pane to be closed. That can then mean that the "pane_wait NS" hangs indefinitely. I believe this will sometimes work, because there's a race between the various options here, but it should be more reliable without the extra ^D. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Fix detection of empty 'hout' responses in passt{,_in_ns} testsDavid Gibson2022-07-221-0/+14
| | | | | | | | | | | | | | The dhcp/passt and dhcp/passt_in_ns tests at least, and maybe others use 'hout' commands that need to be able to detect empty output. However, we don't set PS1, which means the screen-scraping logic which detects this may not be reliable. In addition, if the host is using a recent bash, it will have bracketed paste mode enabled which will also add escape codes which will mess up the empty output detection. Set the prompt and disable bracketed paste mode from the passt and passt_in_ns setups to avoid these problems. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Drop further ^D in passt demo teardownStefano Brivio2022-07-221-5/+1
| | | | | | | | | Similar case as the one fixed by David's patch "tests: Remove unnecessary ^D in passt_in_ns teardown": we happen to pseudo-randomly close panes by unnecessarily exiting the parent shells there, and subsequent pane_wait directives hang. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Explicitly list test files in test/run, remove "onlyfor" supportDavid Gibson2022-07-142-19/+0
| | | | | | | | | | | | | | | | | Currently test/run uses wildcards to run all of the tests in a directory. However, that wildcard list is filtered down by the "onlyfor" directives in the test files... usually to a single file. Therefore, just explicitly list the files we *really* want to run for this test mode. This makes it easier to see at the top level what tests will be executed, and to change that list temporarily while debugging specific failures. This means the "onlyfor" directive no longer has any purpose, and we can remove it. "onlyfor" was also the only used of the $MODE variable, so we can remove that too. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Don't automatically traverse directories of test filesDavid Gibson2022-07-141-2/+2
| | | | | | | | | | | | | | | The top level listing control of which tests to run is in test/run, however it uses the test() function which runs an entire directory of test files, filtered by some criteria. This makes it awkward to narrow down to a subset of tests when debugging a specific failure. To make this easier, have test() take an explicit list of test files to run, and have the caller in test/run handle the directory traversal. The construct we use for this is pretty awkward to handle the fact that we're in the source tree root directory rather than test/ at this point in test/run. Later cleanups will improve that. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove not-very-useful "req" directiveDavid Gibson2022-07-141-18/+10
| | | | | | | | | | | | | | | | | The test scripts support a "req" directive which requires one test script to be run before another. It's implemented by doing a topological sort based on these directives in the runner scripts, which is about as awkward as you'd expect in Bourne shell. It turns out we only use this functionality in one place - to make the "make install" test run after the plain "make" test. We also already have a simpler way of making sure tests run in a specific order: just put them into the same test script file. So, remove support for the "req" directive and just fold the build/all and build/install test scripts together. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Remove unused set_mode() functionDavid Gibson2022-07-141-13/+0
| | | | | | This utility function is never called. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Move mbuto download and execution to asset buildDavid Gibson2022-07-141-17/+6
| | | | | | | | | | | | Move the download of mbuto and using it to create a sample initramfs to the asset build makefile, rather than embedding it in the test scripts themselves. The two_guests tests used to use two separate copies of the mbuto image. As an initramfs the mbuto image is strictly readonly though, so that's not necessary. So, also use the same image for both guests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Introduce makefile for building test assetsDavid Gibson2022-07-141-1/+1
| | | | | | | | | | | | | | A number of passt/pasta testcases have initial steps which are just about building images or other assets we need for the test proper. Repeating these for each test run can be quite costly. This patch makes a start on moving this sort of test asset building to a separate phase before running the tests proper. For now just add a Makefile to handle the asset building (although it doesn't build anything yet), and make the path where we'll be building the assets available to the tests. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Invoke specific qemu-system-* binariesDavid Gibson2022-07-141-4/+13
| | | | | | | | | | | | | | | | | | | | | | A lot of tests and examples invoke qemu with the command "kvm". However, as far as I can tell, "kvm" being aliased to the appropriate qemu system binary is Debian specific. The binary names from qemu upstream - qemu-system-$ARCH - also aren't universal, but they are more common (they should be good for both Debian and Fedora at least). In order to still get KVM acceleration when available, we use the option "-M accel=kvm:tcg" to tell qemu to try using either KVM or TCG in that order A number of the places we invoked "kvm" are expecting specifically an x86 guest, and so it's also safer to explicitly invoke qemu-system-x86_64. Some others appear to be independent of the target arch (just wanting the same arch as the host to allow KVM acceleration). Although I suspect there may be more subtle x86 specific options in the qemu command lines, attempt to preserve arch independence by using $(uname -m). Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* test: Add external mbuto profile, drop udhcpc, and switch to itStefano Brivio2022-07-061-1/+1
| | | | | | | | | This depends on a future change in mbuto to accept external profile files. Add a file defining what we need for tests and demos, dropping udhcpc and script as they're not needed anymore, and switch to it. Suggested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* Use dhclient instead of udhcpcDavid Gibson2022-06-151-3/+3
| | | | | | | | | | | | For some reason, the passt/pasta tests and examples use dhclient for DHCPv6, but in most cases use udhcpc for DHCPv4. Change it to use dhclient for both DHCPv4 and DHCPv6. This means one less tool we need for testing, plus dhclient is easily available on Fedora whereas udhcpc is not. Note that the passt tests still rely on udhcpc indirectly because mbuto wants to put it into the guest images it generates. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Tweak dhclient arguments for readabilityDavid Gibson2022-06-151-1/+1
| | | | | | | | | | | | | | A number of tests and examples use dhclient in both IPv4 and IPv6 modes. We use "dhclient -6" for IPv6, but usually just "dhclient" for IPv4. Add an explicit "-4" argument to make it more clear and explicit. In addition, when dhclient is run from within pasta it usually won't be "real" root, and so will not have access to write the default global pid file. This results in a mostly harmless but irritating error: Can't create /var/run/dhclient.pid: Permission denied We can avoid that by using the --no-pid flag to dhclient. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* Don't abbreviate ip(8) arguments in examples and testsDavid Gibson2022-06-151-2/+2
| | | | | | | | ip(8)'s ability to take abbreviated arguments (e.g. "li sh" instead of "link show") is very handy when using it interactively, but it doesn't make for very readable scripts and examples when shown that way. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Don't check exit code for every command in demo modeStefano Brivio2022-05-191-0/+3
| | | | | | | Having all those 'echo $?' is rather distracting in demos. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Sefano Brivio <sbrivio@redhat.com>
* tests: Don't count number of test units for demosStefano Brivio2022-05-191-2/+4
| | | | | | | | ...there are no 'test' directives in demo, and this causes a script failure. Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Simplify *tools commands using pane_statusDavid Gibson2022-05-191-15/+10
| | | | | | | | | Now that we have pane_status to check the success of commands issued to panes, we can more easily check for the success of the 'which' commands used to check tool availability, rather than constructing, then parsing special "skip" output. Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
* tests: Add pane_status command to check for success of issued commandsDavid Gibson2022-05-193-50/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | When we use pane_wait to wait for a command issued to a tmux pane to finish we have no idea whether the command succeeded or not. This means that the test scripts can keep running long after the point something vital has failed, making it difficult to work out what went wrong. Add a new pane_status command that checks for success of the issued command and use it in most places instead of pane_wait. We still need explicit pane_wait where we're gathering explicit output with pane_parse, because the way we check the status with 'echo $?' means we lose track of that output. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: - instead of quitting the script, make a test fail if a command issued in a pane fails during a test, and loop until the status code is numeric in pane_status() as a hack to make it a bit more robust - retain usage of pane_wait() in iperf3 and teardown functions as we interrupt iperf3, passt, and pasta, so a non-zero exit code is expected - drop bogus ns_{1,2}_wait() calls in teardown_two_guests(), those functions were never implemented - use pane_status() for "guest" test directives too ] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Don't ignore errors during scriptDavid Gibson2022-05-191-5/+5
| | | | | | | | | | | | | | | | Most commands issued during the testing scripts aren't explicitly checked for errors. Therefore, if they fail, the shell will just keep on executing. This makes it difficult to figure out where things started going wrong if things fall over. Run the whole script with the set -e mode so that it will exit in the case of any (unchecked) failing command. To make this work we do need to add explicit checks / fallbacks for some commands which we expect to fail. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: use sh -e instead of setting -e later, so that we don't miss anything before set -e is issued] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
* tests: Improve control character filtering in pane_parseDavid Gibson2022-05-191-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | pane_parse() attempts to grab the output from the last command issued into a tmux pane. It strips out control characters using tr, which in particular includes the final \r\n. However, this won't fully strip out terminal escape sequences. In particular this breaks if the shell in the pane is bash, with enable-bracketed-paste enabled in readline. That issues terminal sequences to enable and disable bracketed paste mode around every shell prompt. We can work around this because these escapes are followed by a \r (CR). More generally, it seems reasonable to assume that any terminal shenanigans followed by a CR, but not an LF is supposed to be hidden. So, use sed to strip everything before the second last CR. We still need the tr to remove the final \r\n from the string (sed processes a line at a time, and doesn't consider the CRLF part of the buffer it's processing). Signed-off-by: David Gibson <david@gibson.dropbear.id.au> [sbrivio: modify regexp to keep foo\r\r\n unchanged, by matching on at least one CR and a non-CR afterwards: that's the usual output pattern for bash on Debian 8 and Debian 9] Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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