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1 #! perl |
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2 |
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3 # sync_hg_xxx.pl |
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4 |
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5 use strict; |
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6 use Getopt::Long; |
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7 use File::Temp qw/ tempfile tempdir /; # for tempfile() |
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8 |
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9 my $verbose; |
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10 my $debug = 0; |
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11 my $rootdir; |
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12 my $help; |
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13 my $remoterepo; |
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14 my $hgbranch; |
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15 my $sync_prefix = "sync_"; |
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16 |
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17 # abandon_sync, all ye who enter here |
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18 # This should send a notification to someone, as it will probably mean manual repair |
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19 # |
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20 sub abandon_sync(@) |
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21 { |
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22 print "ERROR - synchronisation of $rootdir abandoned\n\n"; |
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23 print @_; |
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24 print "\n\n"; |
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25 exit(1); |
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26 } |
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27 |
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28 # utility to run an external command |
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29 # |
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30 sub run_cmd($;$) |
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31 { |
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32 my ($cmd,$failurematch) = @_; |
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33 print "--- $cmd\n" if ($verbose || $debug); |
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34 my @output = `$cmd`; |
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35 print @output,"\n---\n" if ($debug); |
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36 |
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37 if (defined $failurematch) |
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38 { |
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39 if (grep /$failurematch/, @output) |
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40 { |
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41 abandon_sync("COMMAND FAILED: $cmd\n", @output,"\n\n", |
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42 "Output matched $failurematch\n"); |
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43 } |
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44 else |
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45 { |
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46 print "CMD OK - Didn't match /$failurematch/\n" if ($debug); |
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47 } |
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48 } |
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49 if ($?) |
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50 { |
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51 print @output,"\n---\n" if ($verbose); |
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52 abandon_sync("COMMAND FAILED: exit status = $?\n",$cmd,"\n"); |
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53 } |
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54 |
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55 return @output; |
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56 } |
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57 |
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58 |
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59 # -------------- hg section ------------- |
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60 # |
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61 # Code relating to other SCM system is abstracted into |
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62 # functions to do relatively simple actions. This section |
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63 # contains the driving logic for the script, and all of the |
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64 # manipulations of Mercurial |
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65 # |
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66 |
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67 sub scm_usage(); # forward declarations |
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68 sub scm_options(); |
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69 sub scm_init($@); |
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70 sub scm_checkout($); # non-destructive, i.e. leave untouched any workspace files not managed in SCM |
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71 sub scm_checkin($$$$$$); |
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72 |
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73 sub Usage(;$) |
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74 { |
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75 my ($errmsg) = @_; |
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76 print "\nERROR: $errmsg\n" if (defined $errmsg); |
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77 scm_usage(); |
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78 print <<'EOF'; |
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79 |
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80 General options: |
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81 |
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82 -root rootdir root of the Mercurial gateway repository |
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83 -v verbose |
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84 -h print this usage information |
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85 |
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86 Setting up a new synchronisation: |
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87 |
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88 -clone remoterepo clones gateway from remote repository |
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89 -branch hgbranch Mercurial branch name (if needed) |
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90 |
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91 EOF |
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92 exit 1; |
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93 } |
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94 |
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95 Usage() if !GetOptions( |
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96 'root=s' => \$rootdir, |
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97 'h' => \$help, |
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98 'v' => \$verbose, |
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99 'debug' => \$debug, |
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100 'clone=s' => \$remoterepo, |
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101 'branch=s' => \$hgbranch, |
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102 scm_options() |
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103 ); |
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104 |
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105 Usage() if ($help); |
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106 |
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107 Usage("Must specify root directory for Mercurial gateway") if (!defined $rootdir); |
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108 Usage("-branch is only used with -clone") if (defined $hgbranch && !defined $remoterepo); |
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109 |
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110 if ($verbose) |
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111 { |
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112 my @hgversion = run_cmd("hg --version"); |
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113 print @hgversion; |
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114 } |
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115 |
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116 # utility to return the heads descended from a particular point |
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117 # |
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118 sub hg_heads($) |
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119 { |
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120 my ($rev_on_branch) = @_; |
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121 my @heads = run_cmd("hg heads --template {rev}\\t{tags}\\n $rev_on_branch"); |
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122 return @heads; |
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123 } |
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124 |
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125 # return an unsorted list of synchronisation points, identified by |
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126 # tags beginning with "sync_" |
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127 # |
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128 sub hg_syncpoints(;$) |
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129 { |
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130 my ($tip_rev) = @_; |
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131 my @tags = run_cmd("hg tags"); |
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132 my @syncpoints; |
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133 foreach my $tag (@tags) |
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134 { |
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135 if ($tag =~ /^tip\s+(\d+):\S+$/) |
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136 { |
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137 $$tip_rev = $1 if (defined $tip_rev); |
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138 next; |
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139 } |
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140 if ($tag =~ /^$sync_prefix(.*\S)\s+\S+$/) |
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141 { |
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142 push @syncpoints, $1; |
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143 next |
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144 } |
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145 } |
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146 if ($debug) |
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147 { |
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148 printf "Found %d syncpoints in %d tags:", scalar @syncpoints, scalar @tags; |
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149 print join("\n * ", "",@syncpoints), "\n"; |
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150 } |
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151 return @syncpoints; |
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152 } |
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153 |
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154 my $hg_updated = 0; |
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155 |
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156 # Update the Mercurial workspace to a given sync point |
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157 # |
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158 sub hg_checkout($) |
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159 { |
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160 my ($scmref) = @_; |
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161 |
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162 my $tag = $sync_prefix.$scmref; |
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163 my @output = run_cmd("hg update --clean --rev $tag", "^abort:"); |
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164 $hg_updated = 1; # could check the output in case it didn't change anything |
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165 } |
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166 |
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167 # 0. Create the gateway repository, if -clone is specified |
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168 |
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169 if (defined $remoterepo) |
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170 { |
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171 Usage("Cannot create gateway because $rootdir already exists") if (-d $rootdir); |
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172 |
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173 my $clonecmd = "clone"; |
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174 $clonecmd .= " --rev $hgbranch" if (defined $hgbranch); |
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175 my @output = run_cmd("hg $clonecmd $remoterepo $rootdir"); |
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176 $hg_updated = 1; |
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177 } |
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178 |
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179 chdir $rootdir; |
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180 Usage("$rootdir is not a Mercurial repository") if (!-d ".hg"); |
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181 |
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182 my $something_to_push = 0; |
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183 |
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184 # 1. Prime the SCM system, and get the ordered list of changes available to |
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185 # convert into Mercurial commits |
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186 |
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187 my $first_sync; # is this the first synchronisation? |
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188 my $scm_tip_only; # can we process a series of changes in the SCM system? |
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189 |
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190 my $tip_rev = -1; |
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191 my @syncpoints = hg_syncpoints(\$tip_rev); |
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192 |
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193 if (scalar @syncpoints != 0) |
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194 { |
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195 $first_sync = 0; # no - it's already synchronised |
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196 $scm_tip_only = 0; # so can allow sequence of SCM changes |
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197 } |
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198 else |
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199 { |
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200 print "First synchronisation through this gateway\n" if ($verbose); |
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201 $first_sync = 1; |
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202 if ($tip_rev != -1) |
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203 { |
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204 $scm_tip_only = 1; # because there's already something in the repository |
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205 } |
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206 else |
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207 { |
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208 print "Mercurial repository is empty\n" if ($verbose); |
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209 $scm_tip_only = 0; # allow multiple SCM changes, because there's nothing to merge with |
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210 } |
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211 } |
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212 |
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213 my $opening_scmtag; # ancestor by which we judge the headcount of the result |
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214 my $latest_scmtag; |
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215 |
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216 my @scmrefs = scm_init($scm_tip_only, @syncpoints); |
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217 |
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218 if (scalar @scmrefs == 0) |
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219 { |
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220 print "No changes to process in local SCM\n"; |
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221 $opening_scmtag = $tip_rev; |
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222 } |
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223 else |
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224 { |
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225 $opening_scmtag = $sync_prefix.$scmrefs[0]; |
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226 } |
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227 $latest_scmtag = $opening_scmtag; |
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228 |
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229 if ($scm_tip_only && scalar @scmrefs > 1) |
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230 { |
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231 print "ERROR - cannot handle multiple SCM changes in this situation\n"; |
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232 exit(1); |
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233 } |
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234 |
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235 # 2. Process the SCM changes, turning them into Mercurial commits and marking with tags |
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236 # - we guarantee that there is at most one change, if this is the first synchronisation |
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237 |
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238 foreach my $scmref (@scmrefs) |
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239 { |
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240 my ($user,$date,@description) = scm_checkout($scmref); |
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241 |
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242 # commit the result |
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243 |
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244 my ($fh,$filename) = tempfile(); |
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245 print $fh join("\n",@description), "\n"; |
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246 close $fh; |
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247 |
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248 run_cmd("hg commit --addremove --date \"$date\" --user \"$user\" --logfile $filename", "^abort\:"); |
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249 $something_to_push = 1; |
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250 |
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251 unlink($filename); # remove temporary file |
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252 |
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253 my $tag = $sync_prefix.$scmref; |
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254 run_cmd("hg tag --local $tag"); |
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255 $latest_scmtag = $tag; |
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256 print "Synchronised $scmref into Mercurial gateway repository\n"; |
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257 } |
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258 |
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259 # 3. Put the full Mercurial state into the SCM, if this is the first synchronisation |
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260 |
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261 if ($first_sync) |
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262 { |
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263 my @traceback = run_cmd("hg log --limit 1 --template {rev}\\t{node}\\t{tags}\\n"); |
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264 my $line = shift @traceback; |
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265 |
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266 chomp $line; |
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267 my ($rev,$node,$tags) = split /\t/,$line; |
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268 |
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269 if ($rev != 0) |
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270 { |
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271 # repository was not empty, so need to commit the current state back into Perforce |
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272 |
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273 my @description = run_cmd("hg log --rev $rev --template \"{author}\\n{date|isodate}\\n{desc}\""); |
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274 chomp @description; |
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275 my $author = shift @description; |
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276 my $date = shift @description; |
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277 my @changes = run_cmd("hg status --clean"); # include info on unmodified files |
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278 @changes = sort @changes; |
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279 |
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280 # Deliver changes to SCM |
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281 my $scmref = scm_checkin($node,$author,$date,\@changes,\@description,$tags); |
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282 |
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283 my $tag = $sync_prefix.$scmref; |
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284 run_cmd("hg tag --local $tag"); |
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285 $latest_scmtag = $tag; |
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286 print "Synchronised $scmref from Mercurial gateway, to initialise the synchronisation\n"; |
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287 } |
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288 |
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289 $opening_scmtag = $latest_scmtag; # don't consider history before this point |
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290 } |
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291 |
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292 |
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293 # 3. pull from Mercurial default path, deal with new stuff |
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294 |
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295 my @pull_output = run_cmd("hg pull --update"); |
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296 $hg_updated = 1; |
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297 |
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298 my @heads = hg_heads($opening_scmtag); |
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299 |
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300 if (scalar @heads > 1) |
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301 { |
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302 # more than one head - try a safe merge |
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303 print "WARNING: multiple heads\n",@heads,"\nMerge is needed\n\n\n" if ($verbose); |
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304 |
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305 my @merge_output = run_cmd("hg --config \"ui.merge=internal:fail\" merge"); # which head? |
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306 if ($merge_output[0] =~ / 0 files unresolved/) |
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307 { |
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308 # successful merge - commit it. |
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309 run_cmd("hg commit --message \"Automatic merge\""); |
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310 $something_to_push = 1; |
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311 } |
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312 else |
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313 { |
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314 # clean up any partially merged files |
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315 run_cmd("hg update -C"); |
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316 } |
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317 } |
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318 |
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319 # 4. Identify the sequence of Mercurial changes on the trunk and put them into the SCM |
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320 # - Do only the head revision if this is the first synchronisation, to avoid copying ancient history |
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321 |
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322 my $options = "--follow-first"; |
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323 $options .= " --prune $latest_scmtag"; |
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324 |
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325 my @traceback = run_cmd("hg log $options --template {rev}\\t{node}\\t{tags}\\n"); |
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326 foreach my $line (reverse @traceback) |
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327 { |
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328 chomp $line; |
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329 my ($rev,$node,$tags) = split /\t/,$line; |
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330 if ($tags =~ /$sync_prefix/) |
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331 { |
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332 # shouldn't happen - it would mean that tip goes back to an ancestor |
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333 # of the latest sync point |
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334 abandon_sync("Cannot handle this structure\n",@traceback); |
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335 } |
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336 |
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337 # Read commit information and update workspace from Mercurial |
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338 |
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339 my @description = run_cmd("hg log --rev $rev --template \"{author}\\n{date|isodate}\\n{desc}\""); |
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340 chomp @description; |
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341 my $author = shift @description; |
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342 my $date = shift @description; |
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343 my @changes = run_cmd("hg status --rev $latest_scmtag --rev $rev"); |
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344 @changes = sort @changes; |
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345 |
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346 run_cmd("hg update -C --rev $rev"); |
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347 $hg_updated = 1; |
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348 |
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349 # Deliver changes to SCM |
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350 my $scmref = scm_checkin($node,$author,$date,\@changes,\@description,$tags); |
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351 |
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352 # Tag as the latest sync point |
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353 my $tag = $sync_prefix.$scmref; |
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354 run_cmd("hg tag --local $tag"); |
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355 $latest_scmtag = $tag; |
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356 print "Synchronised $scmref from Mercurial gateway\n"; |
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357 } |
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358 |
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359 # 3. push changes to the destination gateway |
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360 |
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361 if ($something_to_push) |
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362 { |
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363 my @output = run_cmd("hg -v push --force --rev $latest_scmtag"); |
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364 print "\n",@output,"\n" if ($verbose); |
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365 print "Destination Mercurial repository has been updated\n"; |
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366 } |
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367 else |
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368 { |
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369 print "Nothing to push to destination Mercurial repository\n"; |
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370 } |
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371 |
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372 # 4. Check to see if we are in a clean state |
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373 |
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374 @heads = hg_heads($opening_scmtag); |
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375 if (scalar @heads > 1) |
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376 { |
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377 print "\n------------------\n"; |
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378 print "WARNING: Mercurial repository has multiple heads - manual merge recommended\n"; |
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379 } |
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380 |
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381 exit(0); |
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382 |
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383 |
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384 # -------------- SCM section ------------- |
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385 # |
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386 # Code relating to non-Mercurial SCM system. |
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387 # This version implements the sync with XXX |
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388 # |
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389 |
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390 # Utility functions you might want to call are: |
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391 # |
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392 # run_cmd($cmd) |
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393 # - Function which runs the specified command in a subshell and returns the stdout output as a list |
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394 # of strings. The whole script will terminate if the command returns with a non-zero exit status. |
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395 # |
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396 # abandon_sync(@messagelines) |
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397 # - Terminate the synchronisation script and pass on the message to someone who might care... |
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398 # |
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399 # $hg_updated |
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400 # - Global variable set to 1 if Mercurial changes the content of the workspace. This can be used to |
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401 # optimise the XXX system processing during initialisation, because it indicates when the workspace |
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402 # can be considered "clean" by the XXX system. Should be set to 0 whenever the XXX system knows the |
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403 # state of the workspace. |
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404 # |
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405 # hg_checkout($scmref) |
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406 # - Function to call "hg update" to the sync label associated with $scmref. Used during the scm_init |
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407 # function as part of getting the workspaces in harmony before transferring changes. Will set |
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408 # $hg_updated to 1. |
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409 |
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410 |
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411 # scm_usage() |
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412 # |
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413 # This function is called to supply the main "usage" statement for the script, as the |
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414 # interesting description is all about the interaction between Mercurial and XXX. It takes no |
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415 # arguments and should return nothing. |
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416 # |
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417 sub scm_usage() |
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418 { |
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419 print <<'EOF'; |
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420 |
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421 perl sync_hg_xxx.pl -root rootdir [options] |
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422 version 0.7 |
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423 |
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424 Synchronise a branch in XXX with a branch in Mercurial. |
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425 |
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426 The branch starts at rootdir, which is a local Mercurial repository. |
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427 The Perforce clientspec is assumed to exist, to specify modtime & rmdir, |
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428 and to exclude the .hg directory from the rootdir. |
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429 |
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430 The tool will sync rootdir/... to the specified changelist, and |
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431 then reflect all changes affecting this part of the directory tree into |
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432 Mercurial. |
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433 |
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434 The -first option is used to specify the first sync point if the gateway |
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435 has not been previously synchronised, e.g. when -clone is specified. |
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436 |
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437 Perforce-related options: |
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438 |
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439 -m maxchangelist highest changelist to consider |
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440 defaults to #head |
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441 |
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442 EOF |
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443 } |
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444 |
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445 my $max_changelist; # put XXX-specific global variables here |
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446 |
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447 sub scm_options() |
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448 { |
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449 # set defaults |
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450 |
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451 $max_changelist = "#head"; # initialise the XXX global variables here, otherwise it doesn't happen |
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452 |
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453 # return the GetOpt specification |
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454 return ( |
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455 'm|max=s' => \$max_changelist, # add your own bits of GetOpt arguments |
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456 ); |
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457 } |
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458 |
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459 |
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460 # scm_init ($tip_only, @syncpoints) |
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461 # |
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462 # The main code calls this routine once, passing two arguments, and expects to get a |
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463 # list of identifiers to XXX changes which could be synchronised as individual Mercurial |
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464 # commits. These references can be anything which can be used as part of a Mercurial tag name, |
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465 # and the main code will call back into this routine supplying the references one at a time |
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466 # in the list order. |
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467 # |
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468 # If $tip_only is true, then the synchronisation can only handle the most recent version |
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469 # of the code in the XXX system, and will not be able to sync intermediate steps. This usually |
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470 # means that this is the first synchronisation of this branch with Mercurial. At most one identifier |
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471 # should be returned. |
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472 # |
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473 # @syncpoints contains a list of identifiers extracted from the local sync_* tags which mark a change |
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474 # that was synchronised with Mercurial in some previous run. This information allows the XXX system |
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475 # to ignore changes which have previously been processed, and to set itself into a state where |
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476 # the workspace corresponds to the contents of the XXX system at that point. |
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477 # |
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478 # The function returns the list of change identifiers for changes to be taken out of XXX and applied |
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479 # to Mercurial. This list can be empty if there are no new changes since the last synchronisation point, |
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480 # or if there is no content in the branch. |
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481 |
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482 sub scm_init($@) |
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483 { |
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484 my ($tip_only, @syncpoints) = @_; |
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485 |
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486 my $first_changelist; |
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487 |
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488 if ($tip_only) |
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489 { |
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490 # Script says we must synchronise from the XXX tip revision |
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491 |
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492 # Find the first changelist |
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493 |
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494 if (!defined $first_changelist) |
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495 { |
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496 print "XXX branch contains no changes\n"; |
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497 return (); |
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498 } |
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499 print "Synchronisation from tip ($first_changelist)\n" if ($verbose); |
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500 # fall through to complete the initialisation |
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501 } |
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502 else |
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503 { |
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504 # deduce the last synchronisation point from the @syncpoints list |
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505 |
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506 $first_changelist = some_function_of(@syncpoints); |
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507 |
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508 # Get Mercurial & XXX into the synchronised state |
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509 |
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510 hg_checkout($first_changelist); # call back to Mercurial to update from hg repository |
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511 |
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512 # get XXX into state associated with $first_changelist |
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513 |
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514 ## NB this is a bit Perforce specific - you might prefer to separate tip_only processing |
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515 ## from the normal "changes since last synchronisation" processing |
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516 ## |
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517 $first_changelist += 1; # we've already synched that one |
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518 ## |
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519 } |
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520 |
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521 # enumerate the changelists available from the XXX system & return as an ordered list |
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522 |
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523 my @scmrefs = some_function($first_changelist); |
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524 |
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525 if ($verbose) |
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526 { |
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527 printf "Found %d new changelists to process\n", scalar @scmrefs; |
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528 print join(", ", @scmrefs), "\n"; |
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529 } |
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530 |
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531 return @scmrefs; |
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532 } |
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533 |
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534 # scm_checkout($scmref) |
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535 # |
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536 # Update the workspace to reflect the given SCM reference |
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537 # |
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538 # This update should not change files which are not currently managed by the XXX system, but |
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539 # should delete workspace files if the XX change involved deleting files. It is useful, but not essential, |
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540 # for empty directories to be removed if they become empty due to deletions recorded in the XXX change. |
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541 # |
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542 # The function returns a list containing three things: |
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543 # |
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544 # $change_user - the username to be recorded for the Mercurial commit |
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545 # $change_date - the date to be recorded for the Mercurial commit (yyyy-mm-dd hh:mm:ss format) |
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546 # @change_description - the commit message to be used in Mercurial, as a list of lines of text |
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547 # |
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548 # The lines in the change description should not contain end of line markers, as these will be supplied |
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549 # by the main code. |
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550 # |
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551 sub scm_checkout($) |
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552 { |
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553 my ($scmref) = @_; |
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554 |
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555 my @change_description; |
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556 my $change_date; |
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557 my $change_user; |
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558 |
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559 # obtain the user , date and description for the given change identifier |
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560 |
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561 # apply the change to the workspace, ready for Mercurial to deduce with "hg commit --addremove" |
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562 |
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563 return ($change_user,$change_date,@change_description); |
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564 } |
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565 |
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566 |
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567 # scm_checkin($hgnode,$author,$date,$changes,$description,$tags) |
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568 # |
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569 # Describe the changes to the workspace as an SCM change, and return the new identifier (for use in a tag) |
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570 # |
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571 # The function receives 6 parameters, all of which are associated with the Mercurial commit |
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572 # |
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573 # $hgnode - Mercurial commit reference, as a globally unique hexadecimal identifier |
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574 # $author - the author recorded in the commit |
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575 # $date - the date recorded in the commit, in ISO date format (yyyy-mm-dd hh:mm:ss) |
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576 # $changes - Perl reference to the list of file changes (more information below) |
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577 # $description - Perl reference to the list of lines in the commit message |
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578 # $tags - Perl reference to the list of (non-local) tags associated with this commit |
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579 # |
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580 # The changes come from the Mercurial "hg status" command, and consist of a filename relative to the |
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581 # root of the repository, prefixed by a single letter code and a space. The codes that this routine |
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582 # must handle are M = modify, R = remove, A = add, and C = clean. The C codes are only used for the |
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583 # first synchronisation, and so should be handled as "add if not already in XXX". All of the implied |
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584 # changes have already been applied to the files in the workspace - the R files have been deleted, |
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585 # the A files have been added and the M files contain the desired content. |
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586 # |
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587 # The $hgnode should be recorded in the description in the XXX system, as should the $author and $date if |
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588 # they can't be used directly. |
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589 # |
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590 # The function returns the identifier for the completed change, which will be tagged in the Mercurial |
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591 # repository and reported to scm_init() in future synchronisation runs. |
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592 # |
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593 # WARNING: The tag information isn't currently filtered properly, and it is likely that there will |
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594 # need to be a separate scm_tag() function to handle the important Mercurial tags explicitly. Don't try |
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595 # to do much with the tag information just yet. |
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596 # |
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597 sub scm_checkin($$$$$$) |
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598 { |
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599 my ($hgnode,$author,$date,$changes,$description,$tags) = @_; |
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600 |
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601 my @hg_tags = grep !/^tip$/, split /\s+/, $tags; |
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602 my @xxx_modify; |
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603 my @xxx_remove; |
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604 my @xxx_add; |
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605 |
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606 # Separate the changes into lists of files for modify/add/remove |
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607 |
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608 foreach my $line (@$changes) |
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609 { |
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610 my $type = substr($line,0,2,""); # removes type as well as extracting it |
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611 if ($type eq "M ") |
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612 { |
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613 push @xxx_modify, $line; |
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614 next; |
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615 } |
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616 if ($type eq "A " || $type eq "C ") |
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617 { |
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618 push @xxx_add, $line; |
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619 next; |
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620 } |
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621 if ($type eq "R ") |
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622 { |
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623 push @xxx_remove, $line; |
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624 next; |
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625 } |
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626 |
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627 abandon_sync("Unexpected hg status line: $type$line"); |
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628 } |
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629 |
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630 # Create an XXX system change object to record the changes (if necessary) |
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631 # process the lists of files |
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632 |
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633 if (scalar @xxx_add) |
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634 { |
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635 # add the files in the xxx_add list |
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636 } |
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637 |
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638 if (scalar @xxx_modify) |
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639 { |
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640 # process the list of modified files |
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641 } |
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642 |
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643 if (scalar @xxx_remove) |
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644 { |
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645 # remove the files in the xxx_remove list |
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646 } |
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647 |
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648 # Create the change description from the @$description list |
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649 |
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650 # Include the $hgnode as part of the description |
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651 # Use the $author and $date if possible (by might just have to be more descriptive text |
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652 # TODO: Do something with the interesting tags? |
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653 |
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654 my $scmref = some_function(); |
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655 |
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656 return $scmref; |
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657 } |