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1 # vim: set ft=sh : |
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2 # |
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3 # Dependency-based updates + utils |
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4 |
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5 ## Compare the given output file with all given source files: |
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6 # |
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7 # check_update $out ${deps[@]} && do_update $out ... || ... |
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8 # |
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9 # Returns true if the output file needs to be updated. |
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10 function check_update { |
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11 # target |
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12 local out=$1; shift |
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13 |
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14 debug "$out" |
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15 |
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16 # need update? |
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17 local update= |
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18 |
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19 if [ ${#@} == 0 ]; then |
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20 debug " update: unknown deps" |
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21 update=y |
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22 |
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23 elif [ ! -e $out ]; then |
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24 debug " update: dest missing" |
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25 update=y |
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26 |
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27 elif [ $UPDATE_FORCE ]; then |
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28 debug " update: forced" |
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29 update=y |
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30 fi |
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31 |
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32 # check deps |
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33 for dep in "$@"; do |
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34 # don't bother checking if already figured out |
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35 [ $update ] && continue |
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36 |
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37 # check |
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38 if [ ! -e $ROOT/$dep ]; then |
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39 fail "$dst: Missing source: $dep" |
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40 |
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41 elif [ $ROOT/$out -ot $ROOT/$dep ]; then |
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42 debug " update: $dep" |
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43 update=y |
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44 else |
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45 debug " check: $dep" |
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46 fi |
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47 done |
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48 |
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49 [ ! $update ] && debug " up-to-date" |
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50 |
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51 # return |
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52 [ $update ] |
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53 } |
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54 |
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55 ## Generate updated output file from given command's stdout: |
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56 # |
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57 # do_update $out $BIN/cmd --args |
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58 # |
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59 # Writes output to a temporary .new file, optionally shows a diff of changes, and commits |
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60 # the new version to $out (unless noop'd). |
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61 function do_update { |
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62 local out=$1; shift |
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63 local tmp=$out.new |
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64 |
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65 debug "$out" |
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66 cmd "$@" > $ROOT/$tmp |
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67 |
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68 # compare |
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69 if [ -e $ROOT/$out ] && [ $UPDATE_DIFF ]; then |
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70 debug " changes:" |
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71 |
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72 # terse |
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73 indent " " diff --unified=1 $ROOT/$out $ROOT/$tmp || true |
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74 fi |
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75 |
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76 # deploy |
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77 if [ $UPDATE_NOOP ]; then |
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78 # cleanup |
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79 debug " no-op" |
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80 |
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81 cmd rm $ROOT/$tmp |
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82 else |
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83 # commit |
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84 debug " deploy" |
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85 |
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86 cmd mv $ROOT/$tmp $ROOT/$out |
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87 fi |
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88 } |
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89 |
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90 ## Look for a link target: |
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91 # |
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92 # find_link $lnk $tgt... |
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93 # |
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94 # Outputs the first given target to exist, skipping any that are the same as the given $lnk. |
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95 # If no $tgt matches, outputs the last one, or '-'. |
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96 function choose_link { |
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97 local lnk=$1; shift |
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98 local tgt=- |
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99 |
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100 for tgt in "$@"; do |
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101 [ $tgt != $out ] && [ -e $ROOT/$tgt ] && break |
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102 done |
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103 |
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104 echo $tgt |
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105 } |
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106 |
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107 |
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108 ## Compare symlink to target: |
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109 # |
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110 # check_link $lnk $tgt && do_link $lnk $tgt || ... |
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111 # |
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112 # Tests if the symlink exists, and the target matches. |
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113 # Fails if the target does not exist. |
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114 function check_link { |
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115 local lnk=$1 |
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116 local tgt=$2 |
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117 |
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118 [ ! -e $ROOT/$tgt ] && fail "$tgt: target does not exist" |
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119 |
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120 [ ! -e $ROOT/$lnk ] || [ $(readlink $ROOT/$lnk) != $ROOT/$tgt ] |
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121 } |
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122 |
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123 ## Update symlink to point to target: |
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124 # |
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125 # do_link $lnk $tgt |
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126 # |
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127 function do_link { |
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128 local lnk=$1 |
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129 local tgt=$2 |
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130 |
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131 cmd ln -sf $ROOT/$tgt $ROOT/$lnk |
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132 } |
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133 |
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134 ## Update .serial number: |
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135 # |
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136 # do_update_serial $serial |
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137 # |
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138 # Shows old/new serial on debug. |
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139 function do_update_serial { |
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140 local serial=$1 |
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141 |
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142 # read |
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143 local old=$(test -e $ROOT/$serial && cat $ROOT/$serial || echo '') |
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144 |
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145 |
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146 cmd $BIN/update-serial $ROOT/$serial |
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147 |
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148 # read |
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149 local new=$(cat $ROOT/$serial) |
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150 |
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151 debug " $old -> $new" |
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152 } |
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153 |
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154 ## Perform `hg commit` for $DATA |
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155 function do_commit { |
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156 local msg=$1 |
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157 |
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158 indent " " hg_diff |
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159 |
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160 hg_commit "$msg" |
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161 } |
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162 |
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163 |