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1 #!/bin/sh
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2 #
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3 # Copyright (c) 2006, 2008 Junio C Hamano
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4 #
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5 # The "pre-rebase" hook is run just before "git rebase" starts doing
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6 # its job, and can prevent the command from running by exiting with
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7 # non-zero status.
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8 #
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9 # The hook is called with the following parameters:
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10 #
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11 # $1 -- the upstream the series was forked from.
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12 # $2 -- the branch being rebased (or empty when rebasing the current branch).
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13 #
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14 # This sample shows how to prevent topic branches that are already
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15 # merged to 'next' branch from getting rebased, because allowing it
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16 # would result in rebasing already published history.
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17
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18 publish=next
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19 basebranch="$1"
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20 if test "$#" = 2
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21 then
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22 topic="refs/heads/$2"
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23 else
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24 topic=`git symbolic-ref HEAD` ||
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25 exit 0 ;# we do not interrupt rebasing detached HEAD
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26 fi
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27
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28 case "$topic" in
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29 refs/heads/??/*)
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30 ;;
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31 *)
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32 exit 0 ;# we do not interrupt others.
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33 ;;
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34 esac
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35
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36 # Now we are dealing with a topic branch being rebased
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37 # on top of master. Is it OK to rebase it?
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38
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39 # Does the topic really exist?
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40 git show-ref -q "$topic" || {
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41 echo >&2 "No such branch $topic"
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42 exit 1
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43 }
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44
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45 # Is topic fully merged to master?
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46 not_in_master=`git rev-list --pretty=oneline ^master "$topic"`
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47 if test -z "$not_in_master"
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48 then
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49 echo >&2 "$topic is fully merged to master; better remove it."
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50 exit 1 ;# we could allow it, but there is no point.
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51 fi
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52
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53 # Is topic ever merged to next? If so you should not be rebasing it.
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54 only_next_1=`git rev-list ^master "^$topic" ${publish} | sort`
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55 only_next_2=`git rev-list ^master ${publish} | sort`
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56 if test "$only_next_1" = "$only_next_2"
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57 then
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58 not_in_topic=`git rev-list "^$topic" master`
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59 if test -z "$not_in_topic"
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60 then
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61 echo >&2 "$topic is already up-to-date with master"
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62 exit 1 ;# we could allow it, but there is no point.
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63 else
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64 exit 0
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65 fi
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66 else
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67 not_in_next=`git rev-list --pretty=oneline ^${publish} "$topic"`
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68 /usr/bin/perl -e '
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69 my $topic = $ARGV[0];
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70 my $msg = "* $topic has commits already merged to public branch:\n";
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71 my (%not_in_next) = map {
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72 /^([0-9a-f]+) /;
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73 ($1 => 1);
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74 } split(/\n/, $ARGV[1]);
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75 for my $elem (map {
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76 /^([0-9a-f]+) (.*)$/;
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77 [$1 => $2];
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78 } split(/\n/, $ARGV[2])) {
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79 if (!exists $not_in_next{$elem->[0]}) {
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80 if ($msg) {
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81 print STDERR $msg;
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82 undef $msg;
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83 }
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84 print STDERR " $elem->[1]\n";
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85 }
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86 }
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87 ' "$topic" "$not_in_next" "$not_in_master"
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88 exit 1
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89 fi
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90
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91 exit 0
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92
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93 ################################################################
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94
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95 This sample hook safeguards topic branches that have been
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96 published from being rewound.
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97
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98 The workflow assumed here is:
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99
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100 * Once a topic branch forks from "master", "master" is never
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101 merged into it again (either directly or indirectly).
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102
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103 * Once a topic branch is fully cooked and merged into "master",
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104 it is deleted. If you need to build on top of it to correct
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105 earlier mistakes, a new topic branch is created by forking at
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106 the tip of the "master". This is not strictly necessary, but
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107 it makes it easier to keep your history simple.
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108
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109 * Whenever you need to test or publish your changes to topic
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110 branches, merge them into "next" branch.
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111
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112 The script, being an example, hardcodes the publish branch name
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113 to be "next", but it is trivial to make it configurable via
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114 $GIT_DIR/config mechanism.
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115
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116 With this workflow, you would want to know:
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117
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118 (1) ... if a topic branch has ever been merged to "next". Young
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119 topic branches can have stupid mistakes you would rather
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120 clean up before publishing, and things that have not been
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121 merged into other branches can be easily rebased without
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122 affecting other people. But once it is published, you would
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123 not want to rewind it.
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124
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125 (2) ... if a topic branch has been fully merged to "master".
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126 Then you can delete it. More importantly, you should not
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127 build on top of it -- other people may already want to
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128 change things related to the topic as patches against your
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129 "master", so if you need further changes, it is better to
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130 fork the topic (perhaps with the same name) afresh from the
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131 tip of "master".
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132
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133 Let's look at this example:
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134
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135 o---o---o---o---o---o---o---o---o---o "next"
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136 / / / /
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137 / a---a---b A / /
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138 / / / /
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139 / / c---c---c---c B /
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140 / / / \ /
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141 / / / b---b C \ /
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142 / / / / \ /
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143 ---o---o---o---o---o---o---o---o---o---o---o "master"
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144
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145
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146 A, B and C are topic branches.
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147
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148 * A has one fix since it was merged up to "next".
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149
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150 * B has finished. It has been fully merged up to "master" and "next",
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151 and is ready to be deleted.
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152
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153 * C has not merged to "next" at all.
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154
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155 We would want to allow C to be rebased, refuse A, and encourage
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156 B to be deleted.
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157
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158 To compute (1):
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159
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160 git rev-list ^master ^topic next
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161 git rev-list ^master next
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162
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163 if these match, topic has not merged in next at all.
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164
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165 To compute (2):
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166
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167 git rev-list master..topic
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168
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169 if this is empty, it is fully merged to "master".
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