1 Tree Sheriffs Documentation 2 =========================== 3 4 ### Contents ### 5 6 * [What does a sheriff do?](#what_is_a_sheriff) 7 + [Skia tree](#skia_tree) 8 + [DEPS rolls](#deps_rolls) 9 + [Gold and Perf](#gold_and_perf) 10 + [Documentation](#sheriff_doc) 11 * [View current and upcoming sheriffs](#view_current_upcoming_sheriffs) 12 * [How to swap sheriff shifts](#how_to_swap) 13 * [Tips for sheriffs](#tips) 14 + [When to file bugs](#when_to_file_bugs) 15 + [How to close or re-open the tree](#how_close_tree) 16 + [How to revert a CL](#how_to_revert) 17 + [What to do if DEPS roll fails to land](#deps_roll_failures) 18 + [How to rebaseline](#how_to_rebaseline) 19 20 21 <a name="what_is_a_sheriff"></a> 22 What does a sheriff do? 23 ----------------------- 24 25 A sheriff keeps an eye on the tree, DEPS rolls, Gold tool and the Perf tool. 26 27 Below is a brief summary of what the sheriff does for each task: 28 29 <a name="skia_tree"></a> 30 ### Skia tree 31 * Understand the [testing infrastructure](https://skia.org/dev/testing/automated_testing). 32 * Start watching the [status page](https://status.skia.org) for bot breakages. 33 * Track down people responsible for breakages and revert broken changes if there is no easy fix. You can use [blamer](#blamer) to help track down such changes. 34 * Close and open the [tree](http://skia-tree-status.appspot.com). 35 * Keep the builder comments on the [status page](https://status.skia.org) up to date. 36 * File or follow up with [BreakingTheBuildbots bugs](https://bug.skia.org/?q=label:BreakingTheBuildbots). See the tip on [when to file bugs](#when_to_file_bugs). 37 38 <a name="blamer"></a> 39 ### Blamer 40 If you have Go installed, a command-line tool is available to search through 41 git history and do text searches on the full patch text and the commit 42 message. To install blamer run: 43 44 go get go.skia.org/infra/blamer/go/blamer 45 46 Then run blamer from within a Skia checkout. For example, to search if the 47 string "SkDevice" has appeared in the last 10 commits: 48 49 $ $GOPATH/bin/blamer --match SkDevice --num 10 50 51 commit ea70c4bb22394c8dcc29a369d3422a2b8f3b3e80 52 Author: robertphillips <robertphillips (a] google.com> 53 Date: Wed Jul 20 08:54:31 2016 -0700 54 55 Remove SkDevice::accessRenderTarget virtual 56 GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2167723002 57 58 Review-Url: https://codereview.chromium.org/2167723002 59 60 <a name="deps_rolls"></a> 61 ### DEPS rolls 62 * Ensure that [AutoRoll Bot](https://autoroll.skia.org)'s DEPS rolls land successfully. 63 64 <a name="gold_and_perf"></a> 65 ### Gold and Perf 66 * Pay attention for new [Perf](https://perf.skia.org/) and [Gold](https://gold.skia.org/) alerts (by clicking on the bell at the top right of the [status page](https://status.skia.org)). 67 * The sheriff's duty here is to make sure that when developers introduce new images or new perf regressions, that they are aware of what happened, and they use these tools to take appropriate action. 68 69 <a name="sheriff_doc"></a> 70 ### Documentation 71 * Improve/update this documentation page for future sheriffs, especially the [Tips section](#tips). 72 73 In general, sheriffs should have a strong bias towards actions that keep the tree green and then open; if a simple revert can fix the problem, the sheriff <b>should revert first and ask questions later</b>. 74 75 76 <a name="view_current_upcoming_sheriffs"></a> 77 View current and upcoming sheriffs 78 ---------------------------------- 79 80 The list of sheriffs is specified in the [skia-tree-status web app](https://skia-tree-status.appspot.com/sheriff). The current sheriff is highlighted in green. 81 The banner on the top of the [status page](https://status.skia.org) also displays the current sheriff. 82 83 84 <a name="how_to_swap"></a> 85 How to swap sheriff shifts 86 -------------------------- 87 88 If you need to swap shifts with someone (because you are out sick or on vacation), please get approval from the person you want to swap with. Then send an email to skiabot (a] google.com to have someone make the database change (or directly ping rmistry@). 89 90 91 <a name="tips"></a> 92 Tips for sheriffs 93 ----------------- 94 95 <a name="when_to_file_bugs"></a> 96 ### When to file bugs 97 98 Pay close attention to the "Failures" view in the [status page](https://status.skia.org). 99 Look at all existing [BreakingTheBuildbots bugs](https://bug.skia.org/?q=label:BreakingTheBuildbots). If the list is kept up to date then it should accurately represent everything that is causing failures. If it does not, then please file/update bugs accordingly. 100 101 102 <a name="how_close_tree"></a> 103 ### How to close or re-open the tree 104 105 1. Go to [skia-tree-status.appspot.com](https://skia-tree-status.appspot.com). 106 2. Change the status. 107 * To close the tree, include the word "closed" in the status. 108 * To open the tree, include the word "open" in the status. 109 * To caution the tree, include the word "caution" in the status. 110 111 112 <a name="how_to_submit_when_tree_closed"></a> 113 ### How to submit when the tree is closed 114 115 * Submit manually using the "git cl land" with the --bypass-hooks flag. 116 * Add "No-Tree-Checks: true" to your CL description and use the CQ as usual. 117 118 119 <a name="how_to_revert"></a> 120 ### How to revert a CL 121 122 See the revert documentation [here](https://skia.org/dev/contrib/revert). 123 124 125 <a name="deps_roll_failures"></a> 126 ### What to do if DEPS roll fails to land 127 128 A common cause of DEPS roll failures are layout tests. Find the offending Skia CL by examining the commit hash range in the DEPS roll and revert (or talk to the commit author if they are available). If you do revert then keep an eye on the next DEPS roll to make sure it succeeds. 129 130 If a Skia CL changes layout tests, but the new images look good, the tests need to be rebaselined. See [Rebaseline Layout Tests](#how_to_rebaseline). 131 132 <a name="how_to_rebaseline"></a> 133 ### Rebaseline Layout Tests (i.e., add suppressions) 134 135 * First create a Chromium bug: 136 * goto [crbug.com](https://crbug.com) 137 * Make sure you're logged in with your Chromium credentials 138 * Click New Issue 139 * Summary: Skia image rebaseline 140 * Description: 141 * DEPS roll #, 142 * Helpful message about what went wrong (e.g., Changes to how lighting is scaled in Skia r#### changed the following images:) 143 * Layout tests affected 144 * You should copy the list of affected from stdio of the failing bot 145 * Status: Assigned 146 * Owner: yourself 147 * cc: reed@, bsalomon@, robertphillips@ & developer responsible for changes 148 * Labels: OS-All & Cr-Blink-LayoutTests 149 * If it is filter related, cc senorblanco@ 150 151 * (Dispreferred but faster) Edit [skia/skia_test_expectations.txt](https://chromium.googlesource.com/chromium/src/+/master/skia/skia_test_expectations.txt) 152 * Add # comment about what has changed (I usually paraphrase the crbug text) 153 * Add line(s) like the following after the comment: 154 * crbug.com/<bug#youjustcreated> foo/bar/test-name.html [ ImageOnlyFailure ] 155 * Note: this change is usually done in the DEPS roll patch itself 156 157 * (Preferred but slower) Make a separate Blink patch by editing LayoutTests/TestExpectations 158 * Add # comment about what has changed (I usually paraphrase the crbug text) 159 * Add line(s) like the following after the comment: 160 * crbug.com/<bug#youjustcreated> foo/bar/test-name.html [ Skip ] # needs rebaseline 161 * Commit the patch you created and wait until it lands and rolls into Chrome 162 163 * Retry the DEPS roll (for the 1st/dispreferred option this usually means just retrying the layout bots) 164 * Make a Blink patch by editing LayoutTests/TestExpectations 165 * Add # comment about what has changed 166 * Add line(s) like the following after the comment: 167 * crbug.com/<bug#youjustcreated> foo/bar/test-name.html [ Skip ] # needs rebaseline 168 * (if you took the second option above you can just edit the existing line(s)) 169 170 * If you took the first/dispreferred option above: 171 * Wait for the Blink patch to roll into Chrome 172 * Create a Chrome patch that removes your suppressions from skia/skia_test_expectations.txt 173 174 175
