annotate hgmerge @ 1880:05c7d75be925

fix broken environment save/restore when a hook runs. move "run commend with different env/cwd" code out to function in util. new function is called esystem.
author Vadim Gelfer <vadim.gelfer@gmail.com>
date Fri, 10 Mar 2006 22:24:19 -0800
parents d610fe0e6893
children 4392ccefe432 b98160cfb2f3
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 echo $1 $2 $3
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11
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12 LOCAL="$1"
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13 BASE="$2"
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14 OTHER="$3"
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15
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16 if [ -z "$EDITOR" ]; then
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17 EDITOR="vi"
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18 fi
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19
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20 # find decent versions of our utilities, insisting on the GNU versions where we
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21 # need to
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22 MERGE="merge"
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23 DIFF3="gdiff3"
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24 DIFF="gdiff"
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25 PATCH="gpatch"
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26
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27 type "$MERGE" >/dev/null 2>&1 || MERGE=
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28 type "$DIFF3" >/dev/null 2>&1 || DIFF3="diff3"
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29 $DIFF3 --version >/dev/null 2>&1 || DIFF3=
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30 type "$DIFF" >/dev/null 2>&1 || DIFF="diff"
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31 type "$DIFF" >/dev/null 2>&1 || DIFF=
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32 type "$PATCH" >/dev/null 2>&1 || PATCH="patch"
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33 type "$PATCH" >/dev/null 2>&1 || PATCH=
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34
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35 # find optional visual utilities
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36 FILEMERGE="/Developer/Applications/Utilities/FileMerge.app/Contents/MacOS/FileMerge"
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37 KDIFF3="kdiff3"
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38 TKDIFF="tkdiff"
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39 MELD="meld"
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40
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41 type "$FILEMERGE" >/dev/null 2>&1 || FILEMERGE=
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42 type "$KDIFF3" >/dev/null 2>&1 || KDIFF3=
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43 type "$TKDIFF" >/dev/null 2>&1 || TKDIFF=
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44 type "$MELD" >/dev/null 2>&1 || MELD=
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45
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46 # random part of names
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47 RAND="$RANDOM$RANDOM"
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48
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49 # temporary directory for diff+patch merge
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50 HGTMP="${TMPDIR-/tmp}/hgmerge.$RAND"
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51
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52 # backup file
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53 BACKUP="$LOCAL.orig.$RAND"
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54
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55 # file used to test for file change
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56 CHGTEST="$LOCAL.chg.$RAND"
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57
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58 # put all your required cleanup here
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59 cleanup() {
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60 rm -f "$BACKUP" "$CHGTEST"
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61 rm -rf "$HGTMP"
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62 }
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63
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64 # functions concerning program exit
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65 success() {
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66 cleanup
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67 exit 0
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68 }
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69
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70 failure() {
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71 echo "merge failed" 1>&2
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72 mv "$BACKUP" "$LOCAL"
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73 cleanup
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74 exit 1
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75 }
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76
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77 # Ask if the merge was successful
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78 ask_if_merged() {
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79 while true; do
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80 echo "$LOCAL seems unchanged."
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81 echo "Was the merge successful? [y/n]"
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82 read answer
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83 case "$answer" in
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84 y*|Y*) success;;
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85 n*|N*) failure;;
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86 esac
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87 done
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88 }
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89
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90 # Clean up when interrupted
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91 trap "failure" 1 2 3 6 15 # HUP INT QUIT ABRT TERM
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92
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93 # Back up our file (and try hard to keep the mtime unchanged)
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94 mv "$LOCAL" "$BACKUP"
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95 cp "$BACKUP" "$LOCAL"
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96
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97 # Attempt to do a non-interactive merge
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98 if [ -n "$MERGE" -o -n "$DIFF3" ]; then
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99 if [ -n "$MERGE" ]; then
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100 $MERGE "$LOCAL" "$BASE" "$OTHER" 2> /dev/null && success
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101 elif [ -n "$DIFF3" ]; then
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102 $DIFF3 -m "$BACKUP" "$BASE" "$OTHER" > "$LOCAL" && success
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103 fi
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104 if [ $? -gt 1 ]; then
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105 echo "automatic merge failed! Exiting." 1>&2
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106 failure
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107 fi
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108 fi
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109
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110 # on MacOS X try FileMerge.app, shipped with Apple's developer tools
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111 if [ -n "$FILEMERGE" ]; then
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112 cp "$BACKUP" "$LOCAL"
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113 cp "$BACKUP" "$CHGTEST"
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114 # filemerge prefers the right by default
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115 $FILEMERGE -left "$OTHER" -right "$LOCAL" -ancestor "$BASE" -merge "$LOCAL"
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116 [ $? -ne 0 ] && echo "FileMerge failed to launch" && failure
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117 test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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118 fi
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119
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120 if [ -n "$DISPLAY" ]; then
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121 # try using kdiff3, which is fairly nice
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122 if [ -n "$KDIFF3" ]; then
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123 $KDIFF3 --auto "$BASE" "$BACKUP" "$OTHER" -o "$LOCAL" || failure
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124 success
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125 fi
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126
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127 # try using tkdiff, which is a bit less sophisticated
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128 if [ -n "$TKDIFF" ]; then
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129 $TKDIFF "$BACKUP" "$OTHER" -a "$BASE" -o "$LOCAL" || failure
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130 success
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131 fi
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132
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133 if [ -n "$MELD" ]; then
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134 cp "$BACKUP" "$CHGTEST"
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135 # protect our feet - meld allows us to save to the left file
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136 cp "$BACKUP" "$LOCAL.tmp.$RAND"
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137 # Meld doesn't have automatic merging, so to reduce intervention
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138 # use the file with conflicts
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139 $MELD "$LOCAL.tmp.$RAND" "$LOCAL" "$OTHER" || failure
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140 # Also it doesn't return good error code
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141 test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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142 fi
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143 fi
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144
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145 # Attempt to do a merge with $EDITOR
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146 if [ -n "$MERGE" -o -n "$DIFF3" ]; then
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147 echo "conflicts detected in $LOCAL"
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148 cp "$BACKUP" "$CHGTEST"
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149 $EDITOR "$LOCAL" || failure
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150 # Some editors do not return meaningful error codes
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151 # Do not take any chances
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152 test "$LOCAL" -nt "$CHGTEST" && success || ask_if_merged
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153 fi
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154
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155 # attempt to manually merge with diff and patch
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156 if [ -n "$DIFF" -a -n "$PATCH" ]; then
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157
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158 (umask 077 && mkdir "$HGTMP") || {
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159 echo "Could not create temporary directory $HGTMP" 1>&2
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160 failure
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161 }
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162
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163 $DIFF -u "$BASE" "$OTHER" > "$HGTMP/diff" || :
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164 if $PATCH "$LOCAL" < "$HGTMP/diff"; then
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165 success
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166 else
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167 # If rejects are empty after using the editor, merge was ok
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168 $EDITOR "$LOCAL" "$LOCAL.rej" || failure
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169 test -s "$LOCAL.rej" || success
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170 fi
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171 failure
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172 fi
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173
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174 echo
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175 echo "hgmerge: unable to find any merge utility!"
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176 echo "supported programs:"
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177 echo "merge, FileMerge, tkdiff, kdiff3, meld, diff+patch"
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178 echo
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179 failure