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annotate hgmerge @ 1701:4ba8fe499df2

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hgmerge: various cleanups Details: - put temporary file names into variables - make all temporary file names end with random part - cleanup FileMerge handling - do not use hardlinks in FileMerge change test (breaks on FAT) - try harder to keep file mtime unchanged in case of failed merge
author Radoslaw Szkodzinski <astralstorm@gorzow.mm.pl>
date Mon, 06 Feb 2006 17:32:10 -0600
parents e2f91e0acbb8
children 4eea6a747c27
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/bin/sh
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2 #
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3 # hgmerge - default merge helper for Mercurial
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4 #
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5 # This tries to find a way to do three-way merge on the current system.
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6 # The result ought to end up in $1.
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7
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8 set -e # bail out quickly on failure
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9
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10 LOCAL="$1"
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11 BASE="$2"
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12 OTHER="$3"
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13
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14 if [ -z "$EDITOR" ]; then
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15 EDITOR="vi"
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16 fi
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17
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18 # find decent versions of our utilities, insisting on the GNU versions where we
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19 # need to
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20 MERGE=merge
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21 DIFF3=gdiff3
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22 DIFF=gdiff
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23 PATCH=gpatch
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24
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25 type $MERGE >/dev/null 2>&1 || MERGE=
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26 type $DIFF3 >/dev/null 2>&1 || DIFF3=diff3
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27 type $DIFF >/dev/null 2>&1 || DIFF=diff
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28 type $PATCH >/dev/null 2>&1 || PATCH=patch
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29 $DIFF3 --version >/dev/null 2>&1 || DIFF3=
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30
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31 # find optional visual utilities
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32 FILEMERGE='/Developer/Applications/Utilities/FileMerge.app/Contents/MacOS/FileMerge'
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33 KDIFF3=kdiff3
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34 TKDIFF=tkdiff
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35
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36 type $FILEMERGE >/dev/null 2>&1 || FILEMERGE=
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37 type $KDIFF3 >/dev/null 2>&1 || KDIFF3=
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38 type $TKDIFF >/dev/null 2>&1 || TKDIFF=
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39
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40 # random part of names
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41 RAND="$RANDOM.$RANDOM.$RANDOM.$$"
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42
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43 # temporary directory for diff+patch merge
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44 HGTMP="${TMPDIR-/tmp}/hgmerge.$RAND"
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45
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46 # backup file
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47 BACKUP="$LOCAL.orig.$RAND"
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48
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49 # file used to test for file change
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50 CHGTEST="$LOCAL.chg.$RAND"
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51
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52 # put all your required cleanup here
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53 cleanup() {
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54 rm -f "$BACKUP" "$CHGTEST"
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55 rm -rf "$HGTMP"
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56 }
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57
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58 # functions concerning program exit
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59 success() {
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60 cleanup
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61 exit 0
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62 }
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63
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64 failure() {
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65 echo "merge failed" 1>&2
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66 mv "$BACKUP" "$LOCAL"
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67 cleanup
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68 exit 1
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69 }
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70
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71 # Clean up when interrupted
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72 trap "failure" 1 2 3 6 15 # HUP INT QUIT ABRT TERM
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73
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74 # Back up our file (and try hard to keep the mtime unchanged)
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75 mv "$LOCAL" "$BACKUP"
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76 cp "$BACKUP" "$LOCAL"
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78 # Attempt to do a non-interactive merge
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79 if [ -n "$MERGE" ]; then
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80 $MERGE "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && success
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81 cp "$BACKUP" "$LOCAL"
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82 elif [ -n "$DIFF3" ]; then
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83 echo $DIFF3 -m "$BACKUP" "$BASE" "$OTHER"
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84 $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" && success
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85 if [ $? -eq 2 ]; then
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86 echo "$DIFF3 failed! Exiting." 1>&2
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87 cp "$BACKUP" "$LOCAL"
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88 failure
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89 fi
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90 cp "$BACKUP" "$LOCAL"
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91 fi
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92
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93 # on MacOS X try FileMerge.app, shipped with Apple's developer tools
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94 if [ -n "$FILEMERGE" ]; then
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95 cp "$BACKUP" "$LOCAL"
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96 cp "$BACKUP" "$CHGTEST"
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97 # filemerge prefers the right by default
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98 $FILEMERGE -left "$OTHER" -right "$LOCAL" -ancestor "$BASE" -merge "$LOCAL"
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99 [ $? -ne 0 ] && echo "FileMerge failed to launch" && failure
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100 if test "$LOCAL" -nt "$CHGTEST"
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101 then
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102 success
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103 else
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104 echo "$LOCAL seems unchanged. Was the merge successful?"
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105 select answer in yes no
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106 do
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107 test "$answer" == "yes" && success || failure
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108 done
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109 fi
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110 failure
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111 fi
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112
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113 if [ -n "$DISPLAY" ]; then
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114 # try using kdiff3, which is fairly nice
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115 if [ -n "$KDIFF3" ]; then
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116 $KDIFF3 --auto "$BASE" "$LOCAL" "$OTHER" -o "$LOCAL" || failure
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117 success
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118 fi
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119
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120 # try using tkdiff, which is a bit less sophisticated
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121 if [ -n "$TKDIFF" ]; then
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122 $TKDIFF "$LOCAL" "$OTHER" -a "$BASE" -o "$LOCAL" || failure
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123 success
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124 fi
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125 fi
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126
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127 # Attempt to do a merge with $EDITOR
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128 if [ -n "$MERGE" ]; then
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129 echo "conflicts detected in $LOCAL"
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130 $MERGE "$LOCAL" "$BASE" "$OTHER" 2>/dev/null || $EDITOR "$LOCAL"
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131 success
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132 fi
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133
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134 if [ -n "$DIFF3" ]; then
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135 echo "conflicts detected in $LOCAL"
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136 $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" || {
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137 case $? in
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138 1)
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139 $EDITOR "$LOCAL" ;;
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140 2) echo "$DIFF3 failed! Exiting." 1>&2
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141 cp "$BACKUP" "$LOCAL"
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142 failure ;;
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143 esac
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144 success
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145 }
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146 fi
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147
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148 # attempt to manually merge with diff and patch
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149 if [ -n "$DIFF" -a -n "$PATCH" ]; then
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150
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151 (umask 077 && mkdir "$HGTMP") || {
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152 echo "Could not create temporary directory $HGTMP" 1>&2
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153 failure
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154 }
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155
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156 $DIFF -u "$BASE" "$OTHER" > "$HGTMP/diff" || :
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157 if $PATCH "$LOCAL" < "$HGTMP/diff"; then
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158 success
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159 else
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160 # If rejects are empty after using the editor, merge was ok
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161 $EDITOR "$LOCAL" "$LOCAL.rej" && test -s "$LOCAL.rej" || success
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162 fi
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163 failure
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164 fi
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165
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166 echo "hgmerge: unable to find merge, tkdiff, kdiff3, or diff+patch!"
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167 failure