1 | #!/bin/bash
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2 | #
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3 | # $Id$
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4 | #
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5 |
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6 | #-----------------------------------------------------------------------------#
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7 | # This is a set of (recursive) functions for manipulating a dependency graph. #
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8 | # We use algorithms and definitions from chapter 4 (mainly section 4.2) of #
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9 | # https://algs4.cs.princeton.edu/. The graph we manipulate is the directed #
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10 | # graph of the dependencies: nodes are packages in the BLFS book. A node A is #
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11 | # connected to a node B if package A depends on B. A topological order (rev- #
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12 | # erted) is exactly what we want for a build order. But a topological order #
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13 | # only exists if the graph is acyclic. We'll therefore have to remove cycles. #
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14 | # There are a number of other features we want to consider: #
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15 | # - edges are weighted according to the dependency requirement: #
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16 | # 1 for required #
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17 | # 2 for recommended #
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18 | # 3 for optional #
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19 | # 4 for external #
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20 | # We should consider only edges with weight lower or equal to that #
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21 | # specified by the user, but see below. #
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22 | # - we do not want to build the whole book. The user specifies a set of #
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23 | # packages, and we have to consider only nodes reachable from this set #
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24 | # using edges of weight not exceeding the specified weight. #
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25 | # - when doing the topological sort, we want to consider all the edges and #
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26 | # not only those not exceeding the specified weight: If a package A in the #
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27 | # reachable subgraph depends optionally on another package B in the same #
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28 | # subgraph, we want to build B before A. But this means we'll have to #
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29 | # remove cycles for all weights. #
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30 | # - dependencies have another qualifier: before or after. The problem: if a #
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31 | # package A depends on B with an "after" qualifier, and a package C depends #
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32 | # on A with a "before" qualifier, C may need B to be able to use A. So the #
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33 | # only safe way to consider "after" qualifiers is to consider that they are #
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34 | # "before" deps for any parent of the packages considered. #
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35 | # We'll therefore have a 3 pass procedure. First build the set of nodes #
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36 | # reachable from the root set. Second, remove dangling edges (those pointing #
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37 | # to packages outside the node set), and move "after" edges to "before" edges #
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38 | # originating from the parents. Third remove cycles and generate a #
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39 | # topological sort. #
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40 | # #
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41 | # TODO: document each pass
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42 | # Data layout: #
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43 | # TODO: needs also to document the .tree files, and the "f" qualifier
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44 | # #
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45 | # A node of the tree is represented by a text file <nodeName>.dep. Each edge #
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46 | # starting from this node is represented by a line in this file. We keep #
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47 | # those files in the same directory. We introduce a special node named root, #
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48 | # whose edges point to the list of nodes requested by the user. Each line #
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49 | # contains three fields: #
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50 | # - the weight of the edge #
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51 | # - the "before" (b) or "after" (a) qualifier #
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52 | # - the name of the destination of the edge #
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53 | # #
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54 | # TODO: The following is obsolete
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55 | # Circular dependencies: #
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56 | # #
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57 | # In case we find a cirdular dependency, it has the form : #
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58 | # parent->dependency_0->...->dependency_n->dependency_0 #
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59 | # If we want to build dependency_n before dependency_0, no problem: #
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60 | # we just prune the tree at dependency_n. If we want to build first #
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61 | # dependency_0, we need to put dependency_n as a dependency of parent, #
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62 | # then erase and rebuild the subtree from there. Now, we may have met #
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63 | # another circular dependency in the subtree, and erasing the tree makes #
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64 | # us forget the decision which was made. So, after first generating the #
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65 | # list of dependencies from packages.xml, we keep the generated list in #
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66 | # a file <nodeName>.odep, which we modify according to the decision which #
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67 | # was made. #
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68 | #---------------------------------------------------------------------------#
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69 |
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70 | # Global variables:
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71 | # A string of spaces for indenting:
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72 | declare -a spaceSTR=" "
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73 | # When we are backing up from a circular dependency, `parentNode'
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74 | # contains the node which has an edge entering the cycle
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75 | declare parentNode
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76 |
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77 | #---------------------#
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78 | generate_subgraph() { #
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79 | #---------------------#
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80 | : <<inline_doc
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81 | function: Create a subgraph of all the nodes reachable from the node
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82 | represented by the file whose name is $1. The edges considered
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83 | are those with maximal weight DEP_LEVEL (recursive function).
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84 | input vars: $1 : file name corresponding to the node whose edges will be
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85 | followed for the DFS
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86 | $2 : weight of the edge leading to this node
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87 | $3 : depth (root is 1)
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88 | $4 : qualifier (a for after, b for before)
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89 | externals: vars: DEP_LEVEL contains 1 if we want to build the
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90 | tree only for required dependencies,
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91 | 2 if we want also recommended ones,
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92 | 3 if we want also optional ones, but only
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93 | for the requested packages,
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94 | 4 if we want all the dependencies
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95 | MAIL_SERVER contains the name of the MTA we want to use.
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96 | files: ../xsl/dependencies.xsl: stylesheet for creating the
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97 | .dep files
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98 | ../packages.xml: File containing packages id
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99 | and dependencies
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100 | returns: 0 if the tree has been successfully created
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101 | output: files: for each node reachable from $1, a file <node>.dep.
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102 | on error: nothing
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103 | on success: nothing
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104 | inline_doc
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105 |
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106 | local depFile=$1
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107 | local -i weight=$2
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108 | local -i depth=$3
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109 | local qualifier=$4
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110 | local -i spacing=0
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111 | local priostring
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112 | local buildstring
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113 | local id_of_dep
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114 | local prio_of_dep
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115 | local build_of_dep
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116 | local dep_level
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117 |
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118 | if (( depth < 10 )); then spacing=1; fi
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119 | case $weight in
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120 | 1) priostring=required ;;
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121 | 2) priostring=recommended ;;
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122 | 3) priostring=optional ;;
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123 | esac
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124 | case $qualifier in
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125 | a) buildstring=runtime ;;
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126 | b) buildstring= ;;
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127 | esac
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128 | dep_level=$DEP_LEVEL
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129 | if [ "$dep_level" = 3 ] && [ "$depth" -gt 2 ]; then dep_level=2; fi
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130 | if [ "$dep_level" -gt 3 ]; then dep_level=3; fi
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131 | echo -en "\nNode: $depth${spaceSTR:0:$(( depth + spacing ))}${RED}${depFile%.dep}${OFF} $priostring $buildstring"
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132 |
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133 | depth=$(( depth + 1 ))
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134 | if (( depth < 10 )); then spacing=1; else spacing=0; fi
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135 | # Start of loop
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136 | {
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137 | while read prio_of_dep build_of_dep id_of_dep; do
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138 | case $prio_of_dep in
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139 | 1) priostring=required ;;
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140 | 2) priostring=recommended ;;
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141 | 3) priostring=optional ;;
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142 | 4) priostring=external ;;
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143 | esac
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144 | case $build_of_dep in
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145 | a) buildstring=runtime ;;
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146 | b) buildstring= ;;
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147 | esac
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148 | # Has this entry already been seen?
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149 | # We have a special case here: if the entry has been seen at depth > 2
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150 | # and now depth=2 and DEP_LEVEL=3, optional deps have not been processed.
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151 | # If this is the case, just consider it has not been seen.
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152 | if [ -f ${id_of_dep}.dep ] ; then
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153 | case $depth$DEP_LEVEL in
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154 | 23) ;;
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155 | *)
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156 | # Just display it and proceed.
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157 | echo -en "\nEdge: $depth${spaceSTR:0:$((depth + spacing))}${MAGENTA}${id_of_dep}${OFF} $priostring $buildstring"
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158 | continue
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159 | ;;
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160 | esac
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161 | fi
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162 | # Is the weight higher than requested?
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163 | if [ "$prio_of_dep" -gt $dep_level ]; then
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164 | # Just display it and proceed.
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165 | echo -en "\n Out: $depth${spaceSTR:0:$((depth + spacing))}${YELLOW}${id_of_dep}${OFF} $priostring $buildstring"
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166 | continue
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167 | fi
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168 | # Otherwise, let's build the corresponding subgraph.
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169 | xsltproc --stringparam idofdep "$id_of_dep" \
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170 | --stringparam MTA "$MAIL_SERVER" \
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171 | -o ${id_of_dep}.dep \
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172 | ../xsl/dependencies.xsl ../packages.xml
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173 |
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174 | if [[ -s ${id_of_dep}.dep ]]; then # this dependency has dependencies
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175 | generate_subgraph ${id_of_dep}.dep $prio_of_dep $depth $build_of_dep
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176 | else # id_of_dep has no dependencies, just touch the file and display
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177 | touch ${id_of_dep}.dep
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178 | echo -en "\nLeaf: $depth${spaceSTR:0:$((depth + spacing))}${CYAN}${id_of_dep}${OFF} $priostring $buildstring"
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179 | fi
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180 | done
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181 | } <$depFile
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182 | depth=$(( depth - 1 ))
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183 | if (( depth < 10 )); then spacing=1; else spacing=0; fi
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184 | echo -en "\n End: $depth${spaceSTR:0:$((depth + spacing))}${GREEN}${depFile%.dep}${OFF}"
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185 | return 0
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186 | }
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187 |
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188 | #-----------#
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189 | path_to() { #
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190 | #-----------#
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191 | : <<inline_doc
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192 | function: check whether there is a path from $1 to $2 on the graph
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193 | input vars: $1 contains the filename of the starting node.
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194 | $2 contains the name of the node to reach
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195 | $3 contains the weight above which we do not want to
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196 | follow an edge
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197 | "seen" (global) contains the list of already seen nodes
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198 | returns: 0 if the node has been found
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199 | 1 if not
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200 | on error: nothing
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201 | on success: nothing
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202 | inline_doc
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203 | local start=$1
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204 | local seek=$2
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205 | local prio=$3
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206 | local prio_of_dep
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207 | local build_of_dep
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208 | local id_of_dep
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209 | local r
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210 |
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211 | if test "${start%.dep}" = "$seek"; then return 0; fi
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212 | seen="$seen${start%.dep} "
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213 | if test -s $start; then
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214 | {
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215 | while read prio_of_dep build_of_dep id_of_dep; do
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216 | if test "$prio" -lt "$prio_of_dep"; then continue; fi
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217 | if ! test "${seen% $id_of_dep *}" = "$seen"; then continue; fi
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218 | if path_to ${id_of_dep}.dep $seek $prio; then return 0; fi
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219 | done
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220 | } < $start
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221 | fi
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222 | return 1
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223 | }
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224 | #------------------#
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225 | clean_subgraph() { #
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226 | #------------------#
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227 | : <<inline_doc
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228 | function: Remove dangling edges and create groups of deps for "after"
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229 | deps: A-before->B-after->C becomes:
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230 | A -before-> Bgroupxx -before-> B
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231 | \
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232 | -before-> C
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233 | the name of the group is chosen so that it is unlikely as
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234 | a package name (so that it is removed when building the
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235 | xml book).
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236 | input vars: None
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237 | files: <node>.dep files containing dangling edges and
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238 | "after" qualifiers
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239 | returns: 0
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240 | output: files: <node>.dep files containing no dangling edges and
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241 | no "after" qualifiers
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242 | on error: nothing
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243 | on success: nothing
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244 | inline_doc
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245 |
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246 | local node
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247 | local id_of_dep
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248 | local prio_of_dep
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249 | local build_of_dep
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250 | local lines_to_remove
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251 | local lines_to_change
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252 | local parent
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253 | local p
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254 | local b
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255 | local start
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256 | local seen
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257 |
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258 | for node in $(ls *.dep); do
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259 | if test $node = root.dep; then continue; fi
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260 | echo Cleaning $node
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261 | lines_to_remove=
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262 | {
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263 | while read prio_of_dep build_of_dep id_of_dep; do
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264 | if ! test -f ${id_of_dep}.dep; then
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265 | lines_to_remove="$lines_to_remove $id_of_dep"
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266 | continue
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267 | fi
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268 | done
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269 | } <$node
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270 | for id_of_dep in $lines_to_remove; do
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271 | sed "/\ $id_of_dep\$/d" -i $node
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272 | done
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273 | done
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274 | for node in $(grep -l ' a ' *.dep); do
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275 | lines_to_remove=
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276 | echo Process "runtime" deps in $node
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277 | if ! [ -e ${node%.dep}groupxx.dep ]; then
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278 | b=0
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279 | for parent in $(grep -l ${node%.dep}\$ *); do
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280 | p=0
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281 | for start in $(grep ' a ' $node | cut -d' ' -f3); do
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282 | seen=" "
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283 | if path_to ${start}.dep ${parent%.dep} 3; then p=1; break; fi
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284 | done
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285 | if test $p = 0; then
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286 | b=1
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287 | sed -i "s/\ ${node%.dep}\$/&groupxx/" $parent
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288 | fi
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289 | done
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290 | echo "1 b ${node%.dep}" > ${node%.dep}groupxx.dep
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291 | if test $b = 0; then echo "1 b ${node%.dep}groupxx" >> root.dep; fi
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292 | fi
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293 | {
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294 | while read prio_of_dep build_of_dep id_of_dep; do
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295 | if test $build_of_dep = a; then
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296 | if ! grep -q ${id_of_dep} ${node%.dep}groupxx.dep; then
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297 | echo "$prio_of_dep b ${id_of_dep}" >> ${node%.dep}groupxx.dep
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298 | fi
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299 | lines_to_remove="$lines_to_remove $id_of_dep"
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300 | fi
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301 | done
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302 | } <$node
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303 | for id_of_dep in $lines_to_remove; do
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304 | sed "/\ $id_of_dep\$/d" -i $node
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305 | done
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306 | done
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307 | for node in $(grep -l ' f ' *); do
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308 | echo Process "first" deps in $node
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309 | lines_to_change=
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310 | {
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311 | while read prio_of_dep build_of_dep id_of_dep; do
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312 | if test $build_of_dep = f; then
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313 | if ! test -f ${id_of_dep}-pass1.dep; then
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314 | cp ${id_of_dep}{,-pass1}.dep;
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315 | fi
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316 | lines_to_change="$lines_to_change $id_of_dep"
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317 | unset lr
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318 | {
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319 | while read p b start; do
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320 | seen=" "
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321 | if path_to ${start}.dep ${node%.dep} $p; then
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322 | lr="$lr $start"
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323 | fi
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324 | done
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325 | } < ${id_of_dep}-pass1.dep
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326 | for p in $lr; do
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327 | sed "/\ $p\$/d" -i ${id_of_dep}-pass1.dep
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328 | done
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329 | fi
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330 | done
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331 | } <$node
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332 | for id_of_dep in $lines_to_change; do
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333 | sed "/\ $id_of_dep\$/"'{s/[[:digit:]] f /1 b /;s/$/-pass1/}' -i $node
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334 | done
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335 | done
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336 | } # End clean_subgraph
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337 |
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338 | #----------------------------#
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339 | generate_dependency_tree() { #
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340 | #----------------------------#
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341 | : <<inline_doc
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342 | function: Create a subtree of the dependency tree
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343 | (recursive function)
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344 | input vars: $1 : file with a list of targets (child nodes)
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345 | the first line of the file is the link
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346 | $2 : priority (1=req, 2=rec, 3=opt)
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347 | returns: 0 if the tree has been successfully created
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348 | 1 if we are backing up to the parent of a circular dep
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349 | and there are only required deps in the cycle
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350 | 2 if we are backing up to the parent of a circular dep
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351 | and there are recommended deps and no optional deps in the
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352 | cycle
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353 | 3 if we are backing up to the parent of a circular dep
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354 | and there are optiional deps in the cycle
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355 | modifies: vars: ParentNode is set when return is not 0
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356 | output: files: for each <pkg> with dependencies in $1,
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357 | a file <pkg>.tree and its dependencies
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358 | on error: nothing
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359 | on success: nothing
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360 | inline_doc
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361 |
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362 | local depFile=$1
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363 | local priority=$2
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364 | local -a rootlink
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365 | local -a priolink
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366 | local -a otherlink
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367 | local -i depth
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368 | local -i count=0
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369 | local id_of_dep
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370 | local build_of_dep
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371 | local prio_of_dep
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372 | local parent
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373 | local lines_to_remove=
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374 | local srootlink
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375 | local priostring
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376 | local dpriostring
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377 | local i
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378 |
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379 | {
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380 | read -a rootlink
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381 | depth=${#rootlink[*]}
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382 | read -a priolink
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383 | srootlink="${rootlink[*]} "
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384 | case $priority in
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385 | 1) priostring=required ;;
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386 | 2) priostring=recommended ;;
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387 | 3) priostring=optional ;;
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388 | esac
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389 | # start of depFile
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390 | echo -en "\nNode: $depth${spaceSTR:0:$depth}${RED}${depFile%.tree}${OFF} $priostring"
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391 |
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392 | while read prio_of_dep build_of_dep id_of_dep; do
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393 | case $prio_of_dep in
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394 | 1) dpriostring=required ;;
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395 | 2) dpriostring=recommended ;;
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396 | 3) dpriostring=optional ;;
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397 | esac
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398 | # count entries in file
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399 | (( count++ ))
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400 | # Has this entry already been seen?
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401 | if [ -f ${id_of_dep}.tree ]; then # found ${id_of_dep}.tree already in tree
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402 | otherlink=($(head -n 1 ${id_of_dep}.tree))
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403 | if [ -z "${otherlink[*]}" ]
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404 | then echo otherlink empty for $id_of_dep.tree
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405 | echo This should not happen, but happens to happen...
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406 | exit 1
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407 | fi
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408 | #Do not use "${rootlink[*]}" =~ "${otherlink[*]}": case rootlink=(1 11)
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409 | # and otherlink=(1 1)
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410 | if [[ ${srootlink#"${otherlink[*]} "} != ${srootlink} ]]; then # cir. dep
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411 | echo -en "\nCirc: $((depth+1))${spaceSTR:0:$((depth+1))}${YELLOW}${id_of_dep}${OFF} $dpriostring"
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412 | # Find lowest priority in branch from parent to depFile:
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413 | p2=0
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414 | for (( i=${#otherlink[*]}; i < $depth ; i++ )) ; do
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415 | if (( ${priolink[i]} > $p2 )); then p2=${priolink[i]}; fi
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416 | done
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417 | if (( $prio_of_dep >= $p2 )); then # prune
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418 | lines_to_remove="$lines_to_remove $id_of_dep"
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419 | sed -i "/$id_of_dep/d" ${depFile/.tree/.dep}
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420 | else # find and set parent, then return lowest priority
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421 | # The parent has the same link without the last entry.
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422 | # We do not need otherlink anymore so just destroy the last element
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423 | unset otherlink[-1]
|
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424 | parentNode=$(grep ^"${otherlink[*]}"\$ -l *)
|
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425 | return $p2
|
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426 | fi
|
---|
427 | else # not circular: prune tree (but not .dep, since it may happen that
|
---|
428 | # the tree is destroyed and rebuilt in another order)
|
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429 | lines_to_remove="$lines_to_remove $id_of_dep"
|
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430 | fi # circular or not
|
---|
431 | continue # this dependency has already been seen, and the associated
|
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432 | # subtree computed. We are done
|
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433 | fi # Has this entry already been seen?
|
---|
434 | # So, this entry has not already been seen. Let's build the corresponding
|
---|
435 | # subtree. First check there is a subtree...
|
---|
436 | # Use -s, because it may happen that after removing lines, .dep exists
|
---|
437 | # but is empty.
|
---|
438 | if [[ -s ${id_of_dep}.dep ]]; then # this dependency has dependencies
|
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439 | sed "1i${rootlink[*]} $count\\
|
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440 | ${priolink[*]} $prio_of_dep" < ${id_of_dep}.dep \
|
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441 | > ${id_of_dep}.tree # add link and priolink
|
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442 | generate_dependency_tree ${id_of_dep}.tree $prio_of_dep
|
---|
443 | # Test return value, in case we exchange dependencies
|
---|
444 | p2=$?
|
---|
445 | case $p2 in
|
---|
446 | 0) # Normal return
|
---|
447 | ;;
|
---|
448 | $prio_of_dep) # we remove this dep, but since it may become unreachable,
|
---|
449 | # move it to be built later (as a dep of parent).
|
---|
450 | tree_erase ${id_of_dep}.tree
|
---|
451 | lines_to_remove="$lines_to_remove $id_of_dep"
|
---|
452 | sed -i "/${id_of_dep}/d" ${depFile/.tree/.dep}
|
---|
453 | echo "$prio_of_dep b $id_of_dep" >> $parentNode
|
---|
454 | # must be added to .dep in case parentNode is destroyed when erasing
|
---|
455 | # the tree
|
---|
456 | echo "$prio_of_dep b $id_of_dep" >> ${parentNode/.tree/.dep}
|
---|
457 | continue
|
---|
458 | ;;
|
---|
459 | *) # We are backing up
|
---|
460 | return $p2
|
---|
461 | ;;
|
---|
462 | esac
|
---|
463 | else # id_of_dep has no dependencies, just record the link in a file
|
---|
464 | # and print
|
---|
465 | echo "${rootlink[*]} $count" > ${id_of_dep}.tree
|
---|
466 | echo -en "\nLeaf: $(($depth+1))${spaceSTR:0:$(($depth+1))}${CYAN}${id_of_dep}${OFF} $dpriostring"
|
---|
467 | fi
|
---|
468 | done
|
---|
469 | echo -en "\n End: $depth${spaceSTR:0:$depth}${GREEN}${depFile%.tree}${OFF}"
|
---|
470 | } <$depFile
|
---|
471 | # It may happen that a file is created with several times
|
---|
472 | # the same line. Normally, all those lines but one
|
---|
473 | # would be flagged to be removed (or all of them if
|
---|
474 | # the dependency appeared before). A simple sed /$line/d
|
---|
475 | # destroys all the lines. We should instead remove
|
---|
476 | # only one for each appearance of it in lines_to_remove.
|
---|
477 | # so first get the position of last line and then delete
|
---|
478 | # that line
|
---|
479 | for line in $lines_to_remove
|
---|
480 | do lineno=$(sed -n /^[[:digit:]]\ b\ $line\$/= $depFile | tail -n1)
|
---|
481 | sed -i ${lineno}d $depFile
|
---|
482 | done
|
---|
483 | return 0
|
---|
484 | }
|
---|
485 |
|
---|
486 |
|
---|
487 | #---------------#
|
---|
488 | tree_browse() { #
|
---|
489 | #---------------#
|
---|
490 | local file=$1
|
---|
491 | local f
|
---|
492 |
|
---|
493 | #echo file=$file
|
---|
494 | for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
|
---|
495 | # echo f=$f
|
---|
496 | if grep -q '[^0-9 ]' ${f}.tree ; then
|
---|
497 | tree_browse ${f}.tree
|
---|
498 | fi
|
---|
499 | echo $f
|
---|
500 | done
|
---|
501 | }
|
---|
502 |
|
---|
503 | #--------------#
|
---|
504 | tree_erase() { #
|
---|
505 | #--------------#
|
---|
506 | local file=$1
|
---|
507 | local f
|
---|
508 | local rootlink
|
---|
509 | local rootlink2
|
---|
510 |
|
---|
511 | #echo file=$file
|
---|
512 | rootlink="$(head -n1 $file) "
|
---|
513 | for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
|
---|
514 | if [ -f ${f}.tree ]; then
|
---|
515 | rootlink2="$(head -n1 ${f}.tree) "
|
---|
516 | # We want two things:
|
---|
517 | # i) do not erase the file if it is in another branch
|
---|
518 | # ii) do not erase the file if there is a circular dependency
|
---|
519 | # for case i), we test that rootlink is contained in rootlink2
|
---|
520 | # for case ii), we test that rootlink2 is not contained in
|
---|
521 | # rootlink.
|
---|
522 | # See comment above about srootlink
|
---|
523 | if [[ ${rootlink2#${rootlink}} != ${rootlink2} &&
|
---|
524 | ${rootlink#${rootlink2}} == ${rootlink} ]] ; then
|
---|
525 | tree_erase ${f}.tree
|
---|
526 | fi
|
---|
527 | fi
|
---|
528 | done
|
---|
529 | rm -f $file
|
---|
530 | }
|
---|