| 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 $p2
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| 426 | fi
|
|---|
| 427 | else # not circular: prune tree (but not .dep, since it may happen that
|
|---|
| 428 | # the tree is destroyed and rebuilt in another order)
|
|---|
| 429 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| 430 | fi # circular or not
|
|---|
| 431 | continue # this dependency has already been seen, and the associated
|
|---|
| 432 | # subtree computed. We are done
|
|---|
| 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 ${id_of_dep}.dep ]]; then # this dependency has dependencies
|
|---|
| 439 | sed "1i${rootlink[*]} $count\\
|
|---|
| 440 | ${priolink[*]} $prio_of_dep" < ${id_of_dep}.dep \
|
|---|
| 441 | > ${id_of_dep}.tree # add link and priolink
|
|---|
| 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 | }
|
|---|
