1 | This file contains notes about the care and feeding of the Athena |
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2 | source repository. It is intended primarily for the administrators of |
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3 | the source tree, not for developers (except perhaps for the first |
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4 | section, "mailing lists"). See the file "procedures" in this |
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5 | directory for information about procedures relevant to developers. |
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6 | |
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7 | The areas covered in this file are: |
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8 | |
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9 | Mailing lists |
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10 | Permissions |
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11 | The wash process |
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12 | Imake templates |
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13 | Release notes |
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14 | Release cycles |
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15 | Patch releases |
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16 | Rel-eng machines |
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17 | Cluster information |
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18 | |
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19 | Mailing lists |
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20 | ------------- |
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21 | |
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22 | Here are descriptions of the mailing lists related to the source tree: |
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23 | |
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24 | * source-developers |
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25 | |
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26 | For discussion of the policy and day-to-day |
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27 | maintenance of the repository. This is a public list, |
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28 | and there is a public discuss archive on menelaus. |
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29 | |
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30 | * source-reviewers |
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31 | |
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32 | For review of changes to be checked into the |
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33 | repository. To be a member of this mailing list, you |
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34 | must have read access to the non-public parts of the |
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35 | source tree, but you do not need to be a staff member. |
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36 | There is a non-public discuss archive on menelaus. |
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37 | |
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38 | * source-commits |
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39 | |
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40 | This mailing lists receives commit logs for all |
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41 | commits to the repository. This is a public mailing |
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42 | list. There is a public discuss archive on menelaus. |
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43 | |
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44 | * source-diffs |
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45 | |
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46 | This mailing list receives commit logs with diffs for |
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47 | all commits to the repository. To be on this mailing |
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48 | list, you must have read access to the non-public |
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49 | parts of the source tree. There is no discuss archive |
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50 | for this list. |
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51 | |
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52 | * source-wash |
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53 | |
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54 | This mailing list receives mail when the wash process |
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55 | blows out. This is a public mailing list. There is |
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56 | no discuss archive for this list. |
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57 | |
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58 | * rel-eng |
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59 | |
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60 | The release engineering mailing list. Mail goes here |
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61 | about patch releases and other release details. There |
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62 | is a public archive on menelaus. |
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63 | |
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64 | * release-team |
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65 | |
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66 | The mailing list for the release team, which sets |
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67 | policy for releases. There is a public archive on |
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68 | menelaus (currently, it has the name "release-77"). |
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69 | |
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70 | Permissions |
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71 | ----------- |
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72 | |
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73 | Following are descriptions of the various groups found on the acls of |
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74 | the source tree: |
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75 | |
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76 | * read:source |
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77 | read:staff |
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78 | |
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79 | These two groups have identical permissions in the |
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80 | repository, but read:source contains artificial |
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81 | constructs (the builder user and service principals) |
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82 | while read:staff contains people. In the future, |
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83 | highly restricted source could have access for |
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84 | read:source and not read:staff. |
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85 | |
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86 | Both of these groups have read access to non-public |
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87 | areas of the source tree. |
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88 | |
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89 | * write:staff |
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90 | |
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91 | Contains developers with commit access to the source |
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92 | tree. This group has write access to the repository, |
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93 | but not to the checked-out copy of the mainline |
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94 | (/mit/source). |
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95 | |
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96 | * write:update |
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97 | |
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98 | Contains the service principal responsible for |
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99 | updating /mit/source. This group has write access to |
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100 | /mit/source but not to the repository. |
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101 | |
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102 | * adm:source |
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103 | |
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104 | This group has administrative access to the repository |
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105 | and to /mit/source. |
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106 | |
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107 | system:anyuser has read access to public areas of the source tree and |
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108 | list access to the rest. system:authuser occasionally has read access |
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109 | to areas that system:anyuser does not (synctree is the only current |
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110 | example). |
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111 | |
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112 | The script CVSROOT/afs-protections.sh in the repository makes sure the |
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113 | permissions are correct in the repository or in a working directory. |
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114 | Run it from the top level of the repository or of /mit/source, giving |
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115 | it the argument "repository" or "wd". |
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116 | |
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117 | The wash process |
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118 | ---------------- |
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119 | |
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120 | The wash process is a nightly rebuild of the source repository from |
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121 | scratch, intended to alert the source tree maintainers when someone |
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122 | checks in a change which causes the source tree to stop building. The |
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123 | general architecture of the wash process is: |
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124 | |
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125 | * Each night at midnight, a machine performs a cvs update of |
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126 | the checked-out tree in /afs/dev.mit.edu/source/src-current. |
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127 | If the cvs update fails, the update script sends mail to |
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128 | source-wash@mit.edu. This machine is on read:source and |
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129 | write:update. |
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130 | |
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131 | * Each night at 4:30am, a machine of each architecture |
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132 | performs a build of the tree into /var/srvd.new, using the |
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133 | build directory /var/build. If the build fails, the wash |
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134 | script copies the log of the failed build into AFS and sends |
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135 | mail to source-wash@mit.edu with the last few lines of the |
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136 | log. If the build succeeds, the wash script moves |
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137 | /var/srvd.new to /var/srvd, so that /var/srvd is always the |
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138 | last successful build of the source tree. |
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139 | |
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140 | * Each Sunday at 1:00am, the wash machines make a copy of |
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141 | their last successful builds into a "srvd-current" directory |
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142 | in AFS. The copy is done without system:administrator |
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143 | privileges, so the file permissions on srvd-current are all |
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144 | wrong, but the current srvd is useful for development work. |
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145 | |
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146 | Source for the wash scripts lives in /afs/dev.mit.edu/service/wash. |
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147 | They are installed in /usr/local on the wash machines. Logs of the |
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148 | start and end times of the wash processes on each machine live in |
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149 | /afs/dev.mit.edu/service/wash/status/`hostname`. See "Rel-eng |
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150 | machines" below to find out which machines take part in the wash |
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151 | process. |
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152 | |
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153 | To set up the source update on a machine: |
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154 | |
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155 | * Ensure that it is in the set of machines installed onto by |
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156 | /afs/dev.mit.edu/service/wash/inst, and run that script to |
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157 | install the wash scripts onto that machine. |
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158 | |
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159 | * Set up the cron job on the machine according to |
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160 | /afs/dev.mit.edu/service/wash/README. |
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161 | |
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162 | * Ensure that the machine has a host key or rcmd srvtab. |
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163 | |
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164 | * Ensure that rcmd.machinename has a PTS identity in the dev |
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165 | cell. |
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166 | |
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167 | * Ensure that rcmd.machinename is in write:update. |
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168 | |
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169 | To set up the wash on a machine: |
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170 | |
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171 | * Ensure that it is in the set of machines installed onto by |
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172 | /afs/dev.mit.edu/service/wash/inst, and run that script to |
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173 | install the wash scripts onto that machine. |
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174 | |
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175 | * Set up cron jobs on the machine according to |
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176 | /afs/dev.mit.edu/service/wash/README. |
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177 | |
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178 | * Ensure that the machine has a host key or rcmd srvtab. |
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179 | |
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180 | * Ensure that rcmd.machinename has a PTS identity in the dev |
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181 | cell. |
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182 | |
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183 | * Ensure that rcmd.machinename is in read:source. |
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184 | |
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185 | * Ensure that |
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186 | /afs/dev.mit.edu/service/wash/status/machinename.mit.edu |
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187 | exists and that rcmd.machinename has write access to it. |
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188 | |
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189 | * Ensure that /afs/dev.mit.edu/system/systemtype/srvd-current |
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190 | exists as a separate volume with adequate quota, and that |
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191 | rcmd.machinename has write access to it. |
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192 | |
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193 | Imake templates |
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194 | --------------- |
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195 | |
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196 | We don't like imake, but we have two sets of imake templates: |
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197 | |
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198 | * packs/build/config |
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199 | |
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200 | These templates are the legacy Athena build system. |
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201 | They are no longer used by any software in the |
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202 | release; we install them in case someone wants to |
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203 | build some very old software. |
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204 | |
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205 | * packs/build/xconfig |
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206 | |
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207 | These templates are used for building software which |
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208 | uses X-style Imakefiles. They may need periodic |
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209 | updating as new versions of X are released. These |
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210 | templates are full of a lot of hacks, mostly because |
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211 | the imake model isn't really adequate for dealing with |
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212 | third-party software and local site customizations. |
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213 | |
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214 | Release notes |
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215 | ------------- |
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216 | |
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217 | There are two kinds of release notes, the system release notes and the |
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218 | user release notes. The system release notes are more comprehensive |
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219 | and assume a higher level of technical knowledge, and are used in the |
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220 | construction of the user release notes. It is the job of the release |
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221 | engineer to produce a set of system release notes for every release, |
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222 | with early versions towards the beginning of the release cycle. The |
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223 | best way to make sure this happens is to maintain the system release |
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224 | notes throughout the entire development cycle. |
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225 | |
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226 | Thus, it is the job of the release engineer to watch the checkins to |
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227 | the source tree and enter a note about all user-visible changes in the |
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228 | system release notes, which live in /afs/dev.mit.edu/project/relnotes. |
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229 | Highly visible changes should appear near the beginning of the file, |
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230 | and less visible changes should appear towards the end. Changes to |
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231 | particular subsystems should be grouped together when possible. |
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232 | |
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233 | Release cycles |
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234 | -------------- |
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235 | |
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236 | Release cycles have five phases: crash and burn, alpha, beta, early, |
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237 | and the public release. The release team has a set of criteria for |
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238 | entering and exiting each phase, which won't be covered here. The |
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239 | following guidelines should help the release go smoothly: |
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240 | |
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241 | * Crash and burn |
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242 | |
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243 | This phase is for rel-eng internal testing. The release |
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244 | engineer needs to make sure that the current source base |
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245 | works well enough for testers to use it and find bugs. For |
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246 | crash and burn to begin, the operating system support person |
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247 | for each platform must provide a way to install or update a |
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248 | machine to the new version of the operating system for that |
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249 | platform. |
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250 | |
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251 | Each platform needs a build tree and system packs volume. |
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252 | The build tree should be mounted in |
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253 | /afs/dev.mit.edu/project/release/<version>/build/<sysname>. |
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254 | The system packs volume should be mounted in |
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255 | /afs/dev.mit.edu/system/<sysname>/srvd-<version>. |
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256 | |
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257 | Each platform needs a new-release build machine to generate |
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258 | system packs to test. For an existing platform, this is |
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259 | generally the wash machine. The wash machine needs to be |
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260 | updated to the new operating system (a reinstall is |
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261 | sometimes the simplest way). Release build machines are set |
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262 | up as follows: |
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263 | |
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264 | - /etc/athena/access contains "builder rl" |
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265 | - In /etc/athena/rc.conf: |
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266 | SSHD is true |
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267 | ACCESSON is true |
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268 | RVDCLIENT is false |
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269 | AUTOUPDATE is false |
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270 | - /build is a symlink to the build tree |
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271 | - /os is a symlink to the rw of the os volume |
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272 | - /install is a symlink to the rw of the os volume |
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273 | - /srvd is a symlink to the ro of the packs |
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274 | - /.srvd is a symlink to the rw of the packs |
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275 | - For Solaris, /usr/gcc is a symlink to /.srvd/usr/gcc |
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276 | - The source locker is attached and locked. |
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277 | |
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278 | Doing a full build for release testing is then simple: |
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279 | |
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280 | # Get tickets as builder and ssh to the wash machine |
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281 | rm -rf /.srvd/* /.srvd/.??* /build/* /build/.??* |
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282 | sh /build/packs/build/build.sh -l & |
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283 | |
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284 | (It can be useful to run the ssh to the build machine inside |
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285 | a screen session so you don't have to log out of the build |
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286 | machine until the build is finished.) |
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287 | |
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288 | The crash and burn machines should be identified and used to |
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289 | test the update (and install, if possible). System packs |
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290 | may be regenerated at will. The system packs volume does |
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291 | not need any replication. |
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292 | |
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293 | System release notes should be prepared during this phase. |
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294 | |
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295 | Before the transition from crash and burn to alpha, the |
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296 | release engineer should do a sanity check on the new packs |
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297 | by comparing a file listing of the new packs to a file |
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298 | listing of the previous release's packs. The release |
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299 | engineer should also check the list of configuration files |
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300 | for each platform (in packs/update/platform/*/configfiles) |
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301 | and make sure that any configuration files which have |
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302 | changed are listed as changed in the version script. |
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303 | Finally, the release should be checked to make sure it won't |
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304 | overflow partitions on any client machines; currently, SGIs |
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305 | are not a problem (because they have one big partition) and |
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306 | the most restrictive sizes on Solaris clients are 27713K and |
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307 | 51903K of useable space for the root and /usr partitions. |
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308 | |
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309 | A note on the wash: it is not especially important that the |
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310 | wash be running during the release cycle, but currently the |
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311 | wash can run on the new release build machine without |
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312 | interfering with the build functions of the machine. |
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313 | So after updating the wash machine to the new OS for new |
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314 | release builds, the release engineer can set up the wash |
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315 | right away. |
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316 | |
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317 | * Alpha |
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318 | |
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319 | The alpha phase is for internal testing by the release team. |
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320 | System packs may still be regenerated at will, but the |
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321 | system packs volume (and os volume) should be read-only so |
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322 | it can be updated by a vos release. Changes to the packs do |
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323 | not need to be propagated in patch releases; testers are |
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324 | expected to be able to ensure consistency by forcing repeat |
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325 | updates or reinstalling their machines. |
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326 | |
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327 | User release notes should be prepared during this phase. |
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328 | |
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329 | Before the transition from alpha to beta, doc/third-party |
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330 | should be checked to see if miscellaneous third-party files |
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331 | (the ones not under the "third" hierarchy) should be |
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332 | updated. |
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333 | |
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334 | * Beta |
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335 | |
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336 | The beta phase involves outside testers. System packs and |
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337 | os volumes should be replicated on multiple servers, and |
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338 | permissions should be set to avoid accidental changes |
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339 | (traditionally this means giving write access to |
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340 | system:packs, a normally empty group). Changes to the packs |
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341 | must be propagated by patch releases. |
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342 | |
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343 | User release notes should be essentially finished by the end |
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344 | of this phase. System release notes may continue to be |
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345 | updated as bug fixes occur. Ideally, no new features should |
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346 | be committed to the source tree during the beta phase. |
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347 | |
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348 | For the transition from beta to early: |
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349 | |
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350 | - Prepare a release branch with a name of the form |
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351 | athena-8_1. Tag it with athena-8_1-early. |
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352 | |
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353 | - Create a volume with a mountpoint of the form |
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354 | /afs/dev.mit.edu/source/src-8.1 and check out a tree |
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355 | on the branch there. Set the permissions by doing |
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356 | an fs copyacl from an older source tree before the |
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357 | checkout, and run CVSROOT/afs-permissions.sh after |
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358 | the checkout. Copy over the .rconf file from the |
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359 | src-current directory. Have a filsys entry of the |
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360 | form source-8.1 created for the new tree. |
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361 | |
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362 | - attach and lock the branch source tree on each build |
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363 | machine. |
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364 | |
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365 | - Do a final full build of the release from the branch |
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366 | source tree. |
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367 | |
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368 | * Early |
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369 | |
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370 | The early release involves more outside testers and some |
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371 | cluster machines. The release should be considered ready |
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372 | for public consumption. |
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373 | |
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374 | The release branch should be tagged with a name of the form |
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375 | athena-8_1-early. |
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376 | |
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377 | * Release |
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378 | |
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379 | The release branch should be tagged with a name of the form |
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380 | athena-8_1-release. |
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381 | |
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382 | Once the release has gone public, the current-release |
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383 | machines should be updated to the release and set up as the |
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384 | build machines for the now-current release. Remove the |
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385 | /build and /.srvd symlinks on the new-release build |
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386 | machines, and make sure the wash is running on them if you |
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387 | didn't do so back in the crash and burn phase. |
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388 | |
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389 | One thing that needs to happen externally during a release cycle, if |
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390 | there is an OS upgrade involved, is the addition of compatibility |
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391 | symlinks under the arch directories of various lockers. All of the |
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392 | lockers listed in packs/glue/specs, as well as tellme, mkserv, and |
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393 | andrew, definitely need to be hit, and the popular software lockers |
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394 | need to be hit as well. Here is a reasonable list of popular lockers |
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395 | to get in addition to the glue ones: |
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396 | |
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397 | consult |
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398 | games |
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399 | gnu |
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400 | graphics |
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401 | outland |
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402 | sipb |
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403 | tcl |
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404 | watchmaker |
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405 | windowmanagers |
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406 | /afs/sipb/project/tcsh |
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407 | |
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408 | In addition, the third-party software lockers need to be updated; the |
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409 | third-party software group keeps their own list. |
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410 | |
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411 | Patch releases |
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412 | -------------- |
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413 | |
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414 | Once a release has hit beta test, all changes to the release must be |
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415 | propagated through patch releases. The steps to performing a patch |
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416 | release are: |
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417 | |
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418 | * Check in the changes on the mainline (if they apply) and on |
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419 | the release branch and update the relevant sections of the |
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420 | source tree in /mit/source-<version>. |
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421 | |
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422 | * If the update needs to do anything other than track against |
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423 | the system packs, you must prepare a version script which |
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424 | deals with any transition issues, specifies whether to track |
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425 | the OS volume, specifies whether to deal with a kernel |
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426 | update, and specifies which if any configuration files need |
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427 | to be updated. See the update script |
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428 | (packs/update/do-update.sh) for details. See |
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429 | packs/build/update/os/*/configfiles for a list of |
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430 | configuration files for a given platform. The version |
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431 | script should be checked in on the mainline and on the |
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432 | release branch. |
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433 | |
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434 | * Do the remainder of the steps as "builder" on the build |
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435 | machine. Probably the best way is to get Kerberos tickets |
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436 | as "builder" and ssh to the build machine. |
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437 | |
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438 | * Make sure to add symlinks under /build tree for any files |
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439 | you have added. Note that you probably added a build script |
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440 | if the update needs to do anything other than track against |
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441 | the system packs. |
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442 | |
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443 | * In the build tree, bump the version number in |
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444 | packs/build/version (the symlink should be broken for this |
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445 | file to avoid having to change it in the source tree). |
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446 | |
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447 | * If you are going to need to update binaries that users run |
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448 | from the packs, go into the packs and move (don't copy) them |
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449 | into a .deleted directory at the root of the packs. This is |
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450 | especially important for binaries like emacs and dash which |
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451 | people run for long periods of time, to avoid making the |
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452 | running processes dump core when the packs are released. |
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453 | |
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454 | * Update the read-write volume of the packs to reflect the |
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455 | changes you've made. You can use the build.sh script to |
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456 | build and install specific packages, or you can use the |
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457 | do.sh script to build the package and then install specific |
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458 | files (cutting and pasting from the output of "gmake -n |
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459 | install DESTDIR=/srvd" is the safest way); updating the |
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460 | fewest number of files is preferrable. Remember to install |
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461 | the version script. |
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462 | |
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463 | * Use the build.sh script to build and install |
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464 | packs/build/finish. This will fix ownerships and update the |
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465 | track lists and the like. |
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466 | |
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467 | * It's a good idea to test the update from the read-write |
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468 | packs by symlinking the read-write packs to /srvd on a test |
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469 | machine and taking the update. Note that when the machine |
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470 | comes back up with the new version, it will probably |
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471 | re-attach the read-write packs, so you may have to re-make |
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472 | the symlink if you want to test stuff that's on the packs. |
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473 | |
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474 | * At some non-offensive time, release the packs in the dev |
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475 | cell. |
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476 | |
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477 | * Send mail to rel-eng saying that the patch release went out, |
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478 | and what was in it. (You can find many example pieces of |
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479 | mail in the discuss archive.) Include instructions |
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480 | explaining how to propagate the release to the athena cell. |
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481 | |
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482 | Rel-eng machines |
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483 | ---------------- |
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484 | |
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485 | The machine running the wash update is equal-rites.mit.edu. |
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486 | |
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487 | There are three rel-eng machines for each platform: |
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488 | |
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489 | * A current release build machine, for doing incremental |
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490 | updates to the last public release. This machine may also |
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491 | be used by developers for building software. |
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492 | |
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493 | * A new release build machine, for building and doing |
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494 | incremental updates to releases which are still in testing. |
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495 | This machine also performs the wash. This machine may also |
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496 | be used by developers for building software, or if they want |
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497 | a snapshot of the new system packs to build things against. |
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498 | |
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499 | * A crash and burn machine, usually located in the release |
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500 | engineer's office for easy physical access. |
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501 | |
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502 | Here is a list of the rel-eng machines for each platform: |
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503 | |
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504 | Sun O2 Linux |
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505 | |
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506 | Current release build downy bounce snuggle |
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507 | New release build maytag whirlpool kenmore |
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508 | Crash and burn the-colour-of-magic reaper-man men-at-arms |
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509 | |
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510 | For reference, here are some names that fit various laundry and |
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511 | construction naming schemes: |
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512 | |
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513 | * Washing machines: kenmore, whirlpool, ge, maytag |
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514 | * Laundry detergents: fab, calgon, era, cheer, woolite, |
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515 | tide, ultra-tide, purex |
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516 | * Bleaches: clorox, ajax |
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517 | * Fabric softeners: downy, final-touch, snuggle, bounce |
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518 | * Heavy machinery: steam-shovel, pile-driver, dump-truck, |
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519 | wrecking-ball, crane |
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520 | * Construction kits: lego, capsela, technics, k-nex, playdoh, |
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521 | construx |
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522 | * Construction materials: rebar, two-by-four, plywood, |
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523 | sheetrock |
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524 | * Heavy machinery companies: caterpillar, daewoo, john-deere, |
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525 | sumitomo |
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526 | * Buildings: empire-state, prudential, chrysler |
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527 | |
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528 | Clusters |
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529 | -------- |
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530 | |
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531 | The getcluster(8) man explains how clients interpret cluster |
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532 | information. This section documents the clusters related to the |
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533 | release cycle, and how they should be managed. |
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534 | |
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535 | There are five clusters for each platform, each of the form |
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536 | PHASE-PLATFORM, where PHASE is a phase of the release cycle (crash, |
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537 | alpha, beta, early, public) and PLATFORM is the machtype name of the |
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538 | platform. There are two filsys entries for each platform and release |
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539 | pointing to the athena cell and dev cell system packs for the release; |
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540 | they have the form athena-PLATFORMsys-XY and dev-PLATFORMsys-XY, where |
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541 | X and Y are the major and minor numbers of the release. For the SGI, |
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542 | we currently also have athena-sgi-inst-XY and dev-sgi-inst-XY. |
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543 | |
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544 | At the crash and burn, alpha, and beta phases of the release cycle, |
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545 | the appropriate cluster (PHASE-PLATFORM) should be updated to include |
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546 | data records of the form: |
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547 | |
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548 | Label: syslib Data: dev-PLATFORMsys-XY X.Y t |
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549 | (SGI) Label: instlib Data: dev-sgi-inst-XY X.Y t |
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550 | |
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551 | This change will cause console messages to appear on the appropriate |
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552 | machines informing their maintainers of a new testing release which |
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553 | they can take manually. |
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554 | |
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555 | At the early and public phases of the release cycle, the 't' should be |
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556 | removed from the new syslib records in the crash, alpha, and beta |
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557 | clusters, and the appropriate cluster (early-PLATFORM or |
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558 | public-PLATFORM) should be updated to include data records: |
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559 | |
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560 | Label: syslib Data: athena-PLATFORMsys-XY X.Y |
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561 | (SGI) Label: instlib Data: athena-sgi-inst-XY X.Y |
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562 | |
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563 | This change will cause AUTOUPDATE machines in the appropriate cluster |
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564 | (as well as the crash, alpha, and beta clusters) to take the new |
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565 | release; console messages will appear on non-AUTOUPDATE machines. |
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