| [3c10176] | 1 | #!/bin/bash
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| 2 | #
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| 3 |
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| [2140f22] | 4 | #-----------------------------------------------------------------------------#
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| 5 | # This is a set of (recursive) functions for manipulating a dependency graph. #
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| 6 | # We use algorithms and definitions from chapter 4 (mainly section 4.2) of #
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| 7 | # https://algs4.cs.princeton.edu/. The graph we manipulate is the directed #
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| 8 | # graph of the dependencies: nodes are packages in the BLFS book. A node A is #
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| 9 | # connected to a node B if package A depends on B. A topological order (rev- #
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| 10 | # erted) is exactly what we want for a build order. But a topological order #
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| 11 | # only exists if the graph is acyclic. We'll therefore have to remove cycles. #
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| 12 | # There are a number of other features we want to consider: #
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| 13 | # - edges are weighted according to the dependency requirement: #
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| 14 | # 1 for required #
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| 15 | # 2 for recommended #
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| 16 | # 3 for optional #
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| 17 | # 4 for external #
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| 18 | # We should consider only edges with weight lower or equal to that #
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| 19 | # specified by the user, but see below. #
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| [abadee3] | 20 | # - we do not want to build the whole book. The user requests a set of #
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| 21 | # packages, and we'd like to consider only nodes reachable from this set #
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| [2140f22] | 22 | # using edges of weight not exceeding the specified weight. #
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| [abadee3] | 23 | # - we do not want to rebuild packages already built. But we still have to #
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| 24 | # generate the full dependency graph, because if A depends on B, which is #
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| 25 | # already built, and B depends on C, which is not built, or needs to be #
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| 26 | # updated, then A may depends on C. We therefore have to remove already #
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| 27 | # built (and up to date) packages from the graph, but need to keep the #
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| 28 | # dependency chain. #
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| [2140f22] | 29 | # - when doing the topological sort, we want to consider all the edges and #
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| 30 | # not only those not exceeding the specified weight: If a package A in the #
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| 31 | # reachable subgraph depends optionally on another package B in the same #
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| [abadee3] | 32 | # subgraph, we want to build B before A if possible. But this means we'll #
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| 33 | # have to remove cycles for all weights. #
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| 34 | # - dependencies have another qualifier: before, after, or first. We use #
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| 35 | # it as follows: for "after", we can build the dependency after the #
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| 36 | # package, but if a package A depends on B with an "after" qualifier, and #
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| 37 | # a package C depends on A with a "before" qualifier, C may need B to be #
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| 38 | # able to use A. So the only safe way to consider "after" qualifiers is to #
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| 39 | # consider that they are "before" deps for any parent of the packages #
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| 40 | # considered. There is an exception to that rule: if B depends on C #
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| 41 | # (possibly through a chain of several dependencies), then C should still #
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| 42 | # be built before B. For "after", the dependency has to be built both #
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| 43 | # before and after the package. So we duplicate the dependency as a #
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| 44 | # "-pass1" package, and change the graph accordingly. #
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| [2140f22] | 45 | # We'll therefore have a 3 pass procedure. First build the set of nodes #
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| 46 | # reachable from the root set. Second, remove dangling edges (those pointing #
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| 47 | # to packages outside the node set), and move "after" edges to "before" edges #
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| [abadee3] | 48 | # originating from the parents as well as creating the "-pass1" nodes. Third #
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| 49 | # remove cycles and generate a topological sort. #
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| [2140f22] | 50 | # #
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| [dd9ca56] | 51 | # Pass 1: graph generation #
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| 52 | # ======================== #
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| 53 | # Data layout for pass 1 #
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| 54 | # ---------------------- #
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| [abadee3] | 55 | # A node of the graph is represented by a text file <nodeName>.dep. Each edge #
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| [2140f22] | 56 | # starting from this node is represented by a line in this file. We keep #
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| 57 | # those files in the same directory. We introduce a special node named root, #
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| 58 | # whose edges point to the list of nodes requested by the user. Each line #
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| 59 | # contains three fields: #
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| 60 | # - the weight of the edge #
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| [dd9ca56] | 61 | # - the qualifier: "before" (b), "after" (a), or "first" (f) #
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| 62 | # - the name of the destination of the edge (without the ".dep" extension) #
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| 63 | # #
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| 64 | # Recursive function "generate_subgraph" #
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| 65 | # -------------------------------------- #
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| 66 | # This function treats a node of the graph that is not a leaf and that is #
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| 67 | # seen for the first time in the DFS. The dependencies of this node are #
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| 68 | # known, and stored in a .dep file. For each dependency in that file, there #
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| 69 | # are three cases: #
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| 70 | # - the weight of the edge leading to that dependency is higher than #
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| 71 | # requested. This dependency is discarded (some information printed) #
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| 72 | # - the weight of the edge is lower or equal to requested, but the node #
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| 73 | # has already been visited (the .dep file exists). Discard too (some #
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| 74 | # information printed) #
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| 75 | # - the weight of the edge is lower or equal to requested, and the node #
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| 76 | # has not been seen: then the dependencies of that node are generated, #
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| 77 | # and there are two cases: #
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| 78 | # - the node has no dependencies: just create an empty .dep file, so #
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| 79 | # that we know the node has been visited #
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| 80 | # - the node has dependencies: call generate_subgraph for that node #
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| 81 | # #
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| 82 | # This function takes four parameters: #
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| 83 | # - The node filename: this is the only one useful for the algorithm #
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| 84 | # - The depth: number of steps starting from root (for pretty print only) #
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| 85 | # - The weight of the edge leading to that node (for printing) #
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| 86 | # - The qualifier (for printing) #
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| 87 | # #
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| [a78cfc9] | 88 | # Pass 2: graph transformation #
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| 89 | # ============================ #
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| 90 | # We now have three loops over nodes of the graph #
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| 91 | # Loop 1: Remove dead edges #
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| 92 | # ------------------------- #
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| [abadee3] | 93 | # Since some nodes have not been created because the edges leading to them #
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| 94 | # had too high a weight, those edges have to be suppressed. #
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| [a78cfc9] | 95 | # For each existing node file, we make a list of lines to remove by #
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| 96 | # testing whether the destination exists. We then remove the lines. #
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| 97 | # Another approach would be to make a temporary file and output only #
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| 98 | # lines that should stay, then rename the file. This would save a loop. #
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| 99 | # All in all it is an N*e process, where N is the number of nodes and e #
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| 100 | # the average number of edges originating from a node. #
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| 101 | # Loop 2: Treat "after" edges #
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| 102 | # --------------------------- #
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| 103 | # If a node is the origin of edges qualified as "after", we want the #
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| 104 | # nodes which are the destination of those edges to be built after #
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| 105 | # the origin node, but before any node that depend on the origin #
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| 106 | # node. For that, the general rule is to change: #
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| 107 | # P---b--->A---a--->D #
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| 108 | # to: #
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| 109 | # P---b--->Agroupxx---b--->A #
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| 110 | # | #
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| 111 | # ---b--->D #
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| 112 | # But there is a problem if D depends on P, possibly through a chain, #
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| 113 | # because we create a cycle which shouldn't exist. If this is the case, #
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| 114 | # we leave A as a dependency of P: #
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| 115 | # P---b--->A #
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| 116 | # #
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| 117 | # Agroupxx---b--->A #
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| 118 | # | #
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| 119 | # ---b--->D #
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| 120 | # Doing so, it may happen that Agroupxx has no parent. We then add #
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| 121 | # Agroupxx as a dependency of root. The problem with this algorithm is #
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| 122 | # the search for paths from D to A, which may be exponential in the #
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| 123 | # number of nodes in the graph. #
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| [abadee3] | 124 | # #
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| 125 | # Loop 3: Add -pass1 nodes #
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| 126 | # ------------------------ #
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| 127 | # Sometimes there is no way to escape a cycle. A package A needs B, and B #
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| 128 | # needs A. In that case, it is often possible to build a degraded version #
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| 129 | # of package A, then B, then rebuild A. The book indicates this with the #
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| 130 | # following dependency chain, using a qualifier of "first": #
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| 131 | # B---f--->A---b--->X...Y---b--->B #
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| 132 | # where the X...Y notation represents a chain of dependencies from A to B. #
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| 133 | # So the third loop is over nodes containing "f" qualifiers, and does the #
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| 134 | # following: it creates a new node A-pass1, which is a copy of A, and #
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| 135 | # remove from A-pass1 all the dependencies leading to B through a chain, #
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| 136 | # to obtain: #
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| 137 | # A---b--->X...Y---b--->B---b--->A-pass1 #
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| 138 | # It may then happen that nothing depends on A. So this is tested, and A #
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| 139 | # is added to the root node if it is orphaned. #
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| 140 | # TODO: document the third pass #
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| [dd9ca56] | 141 | # TODO: needs also to document the .tree files #
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| 142 | # TODO: The following is obsolete #
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| [d7c07e0] | 143 | # Circular dependencies: #
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| [7dc8595] | 144 | # #
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| [d7c07e0] | 145 | # In case we find a cirdular dependency, it has the form : #
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| 146 | # parent->dependency_0->...->dependency_n->dependency_0 #
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| 147 | # If we want to build dependency_n before dependency_0, no problem: #
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| 148 | # we just prune the tree at dependency_n. If we want to build first #
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| 149 | # dependency_0, we need to put dependency_n as a dependency of parent, #
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| 150 | # then erase and rebuild the subtree from there. Now, we may have met #
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| 151 | # another circular dependency in the subtree, and erasing the tree makes #
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| 152 | # us forget the decision which was made. So, after first generating the #
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| 153 | # list of dependencies from packages.xml, we keep the generated list in #
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| 154 | # a file <nodeName>.odep, which we modify according to the decision which #
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| 155 | # was made. #
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| [e4b1293] | 156 | #---------------------------------------------------------------------------#
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| 157 |
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| 158 | # Global variables:
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| [e576789] | 159 | # A string of spaces for indenting:
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| [3c10176] | 160 | declare -a spaceSTR=" "
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| [2140f22] | 161 | # When we are backing up from a circular dependency, `parentNode'
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| 162 | # contains the node which has an edge entering the cycle
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| 163 | declare parentNode
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| [3c10176] | 164 |
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| [2140f22] | 165 | #---------------------#
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| 166 | generate_subgraph() { #
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| 167 | #---------------------#
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| [3c10176] | 168 | : <<inline_doc
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| [2140f22] | 169 | function: Create a subgraph of all the nodes reachable from the node
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| 170 | represented by the file whose name is $1. The edges considered
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| 171 | are those with maximal weight DEP_LEVEL (recursive function).
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| 172 | input vars: $1 : file name corresponding to the node whose edges will be
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| 173 | followed for the DFS
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| 174 | $2 : weight of the edge leading to this node
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| 175 | $3 : depth (root is 1)
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| [dd9ca56] | 176 | $4 : qualifier (a for after, b for before, f for first)
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| [7ac11f0] | 177 | externals: vars: DEP_LEVEL contains 1 if we want to build the
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| 178 | tree only for required dependencies,
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| 179 | 2 if we want also recommended ones,
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| [2140f22] | 180 | 3 if we want also optional ones, but only
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| 181 | for the requested packages,
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| 182 | 4 if we want all the dependencies
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| [dd9ca56] | 183 | (excluding external of course)
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| [7ac11f0] | 184 | MAIL_SERVER contains the name of the MTA we want to use.
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| 185 | files: ../xsl/dependencies.xsl: stylesheet for creating the
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| 186 | .dep files
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| [e91a15d] | 187 | ../packages.xml: File containing packages id
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| [7ac11f0] | 188 | and dependencies
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| [2140f22] | 189 | returns: 0 if the tree has been successfully created
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| 190 | output: files: for each node reachable from $1, a file <node>.dep.
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| 191 | on error: nothing
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| 192 | on success: nothing
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| 193 | inline_doc
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| 194 |
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| 195 | local depFile=$1
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| 196 | local -i weight=$2
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| 197 | local -i depth=$3
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| 198 | local qualifier=$4
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| 199 | local -i spacing=0
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| 200 | local priostring
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| 201 | local buildstring
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| 202 | local id_of_dep
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| 203 | local prio_of_dep
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| 204 | local build_of_dep
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| 205 | local dep_level
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| 206 |
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| 207 | if (( depth < 10 )); then spacing=1; fi
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| 208 | case $weight in
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| 209 | 1) priostring=required ;;
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| 210 | 2) priostring=recommended ;;
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| 211 | 3) priostring=optional ;;
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| 212 | esac
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| 213 | case $qualifier in
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| [dd9ca56] | 214 | a) buildstring=runtime ;;
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| 215 | b|f) buildstring= ;;
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| [2140f22] | 216 | esac
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| 217 | dep_level=$DEP_LEVEL
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| 218 | if [ "$dep_level" = 3 ] && [ "$depth" -gt 2 ]; then dep_level=2; fi
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| 219 | if [ "$dep_level" -gt 3 ]; then dep_level=3; fi
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| 220 | echo -en "\nNode: $depth${spaceSTR:0:$(( depth + spacing ))}${RED}${depFile%.dep}${OFF} $priostring $buildstring"
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| 221 |
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| 222 | depth=$(( depth + 1 ))
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| 223 | if (( depth < 10 )); then spacing=1; else spacing=0; fi
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| 224 | # Start of loop
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| 225 | {
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| 226 | while read prio_of_dep build_of_dep id_of_dep; do
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| [e030049] | 227 | case $prio_of_dep in
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| [2140f22] | 228 | 1) priostring=required ;;
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| 229 | 2) priostring=recommended ;;
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| 230 | 3) priostring=optional ;;
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| 231 | 4) priostring=external ;;
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| [e030049] | 232 | esac
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| 233 | case $build_of_dep in
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| [dd9ca56] | 234 | a ) buildstring=runtime ;;
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| 235 | b|f) buildstring= ;;
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| [e030049] | 236 | esac
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| 237 | # Has this entry already been seen?
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| [dd9ca56] | 238 | # TODO: no there is no special case!
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| [e030049] | 239 | # We have a special case here: if the entry has been seen at depth > 2
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| 240 | # and now depth=2 and DEP_LEVEL=3, optional deps have not been processed.
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| 241 | # If this is the case, just consider it has not been seen.
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| [2140f22] | 242 | if [ -f ${id_of_dep}.dep ] ; then
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| [e030049] | 243 | case $depth$DEP_LEVEL in
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| 244 | 23) ;;
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| 245 | *)
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| [2140f22] | 246 | # Just display it and proceed.
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| [e030049] | 247 | echo -en "\nEdge: $depth${spaceSTR:0:$((depth + spacing))}${MAGENTA}${id_of_dep}${OFF} $priostring $buildstring"
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| 248 | continue
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| 249 | ;;
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| 250 | esac
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| [2140f22] | 251 | fi
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| 252 | # Is the weight higher than requested?
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| 253 | if [ "$prio_of_dep" -gt $dep_level ]; then
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| 254 | # Just display it and proceed.
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| 255 | echo -en "\n Out: $depth${spaceSTR:0:$((depth + spacing))}${YELLOW}${id_of_dep}${OFF} $priostring $buildstring"
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| 256 | continue
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| 257 | fi
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| 258 | # Otherwise, let's build the corresponding subgraph.
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| 259 | xsltproc --stringparam idofdep "$id_of_dep" \
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| 260 | --stringparam MTA "$MAIL_SERVER" \
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| 261 | -o ${id_of_dep}.dep \
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| 262 | ../xsl/dependencies.xsl ../packages.xml
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| 263 |
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| 264 | if [[ -s ${id_of_dep}.dep ]]; then # this dependency has dependencies
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| 265 | generate_subgraph ${id_of_dep}.dep $prio_of_dep $depth $build_of_dep
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| 266 | else # id_of_dep has no dependencies, just touch the file and display
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| 267 | touch ${id_of_dep}.dep
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| 268 | echo -en "\nLeaf: $depth${spaceSTR:0:$((depth + spacing))}${CYAN}${id_of_dep}${OFF} $priostring $buildstring"
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| 269 | fi
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| 270 | done
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| 271 | } <$depFile
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| 272 | depth=$(( depth - 1 ))
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| 273 | if (( depth < 10 )); then spacing=1; else spacing=0; fi
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| 274 | echo -en "\n End: $depth${spaceSTR:0:$((depth + spacing))}${GREEN}${depFile%.dep}${OFF}"
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| 275 | return 0
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| 276 | }
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| 277 |
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| 278 | #-----------#
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| 279 | path_to() { #
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| 280 | #-----------#
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| 281 | : <<inline_doc
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| 282 | function: check whether there is a path from $1 to $2 on the graph
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| 283 | input vars: $1 contains the filename of the starting node.
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| 284 | $2 contains the name of the node to reach
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| 285 | $3 contains the weight above which we do not want to
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| 286 | follow an edge
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| [e0bbc6e] | 287 | $seen (global) contains the list of already seen nodes.
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| 288 | It must ve set to " " prior to calling the function
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| [2140f22] | 289 | returns: 0 if the node has been found
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| 290 | 1 if not
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| 291 | on error: nothing
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| 292 | on success: nothing
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| 293 | inline_doc
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| 294 | local start=$1
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| 295 | local seek=$2
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| 296 | local prio=$3
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| 297 | local prio_of_dep
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| 298 | local build_of_dep
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| 299 | local id_of_dep
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| 300 | local r
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| 301 |
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| 302 | if test "${start%.dep}" = "$seek"; then return 0; fi
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| [59afe73] | 303 | seen="$seen${start%.dep} "
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| [5afaf7c] | 304 | if test -s $start; then
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| [2140f22] | 305 | {
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| 306 | while read prio_of_dep build_of_dep id_of_dep; do
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| 307 | if test "$prio" -lt "$prio_of_dep"; then continue; fi
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| [5afaf7c] | 308 | if ! test "${seen% $id_of_dep *}" = "$seen"; then continue; fi
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| [2140f22] | 309 | if path_to ${id_of_dep}.dep $seek $prio; then return 0; fi
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| 310 | done
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| 311 | } < $start
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| 312 | fi
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| 313 | return 1
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| 314 | }
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| 315 | #------------------#
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| 316 | clean_subgraph() { #
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| 317 | #------------------#
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| 318 | : <<inline_doc
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| 319 | function: Remove dangling edges and create groups of deps for "after"
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| 320 | deps: A-before->B-after->C becomes:
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| 321 | A -before-> Bgroupxx -before-> B
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| 322 | \
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| 323 | -before-> C
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| 324 | the name of the group is chosen so that it is unlikely as
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| 325 | a package name (so that it is removed when building the
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| 326 | xml book).
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| [141d072] | 327 | Also change the "first" qualifier so that a cycle:
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| 328 | A -first-> B ---chain---> A becomes:
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| 329 | B ---chain---> A -before-> B-pass1
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| 330 | and we remove all the dependencies which have a chain to
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| 331 | A in B-pass1.
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| 332 | Since we do not change anything else, it may happen that
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| 333 | nothing depends on B. In that case, B is appended to root.
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| [2140f22] | 334 | input vars: None
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| 335 | files: <node>.dep files containing dangling edges and
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| 336 | "after" qualifiers
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| 337 | returns: 0
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| 338 | output: files: <node>.dep files containing no dangling edges and
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| 339 | no "after" qualifiers
|
|---|
| 340 | on error: nothing
|
|---|
| 341 | on success: nothing
|
|---|
| 342 | inline_doc
|
|---|
| 343 |
|
|---|
| 344 | local node
|
|---|
| 345 | local id_of_dep
|
|---|
| 346 | local prio_of_dep
|
|---|
| 347 | local build_of_dep
|
|---|
| 348 | local lines_to_remove
|
|---|
| 349 | local lines_to_change
|
|---|
| 350 | local parent
|
|---|
| 351 | local p
|
|---|
| 352 | local b
|
|---|
| 353 | local start
|
|---|
| 354 | local seen
|
|---|
| 355 |
|
|---|
| 356 | for node in $(ls *.dep); do
|
|---|
| 357 | if test $node = root.dep; then continue; fi
|
|---|
| [28546ae] | 358 | echo Cleaning $node
|
|---|
| [2140f22] | 359 | lines_to_remove=
|
|---|
| 360 | {
|
|---|
| 361 | while read prio_of_dep build_of_dep id_of_dep; do
|
|---|
| 362 | if ! test -f ${id_of_dep}.dep; then
|
|---|
| 363 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| 364 | continue
|
|---|
| 365 | fi
|
|---|
| 366 | done
|
|---|
| 367 | } <$node
|
|---|
| 368 | for id_of_dep in $lines_to_remove; do
|
|---|
| 369 | sed "/\ $id_of_dep\$/d" -i $node
|
|---|
| 370 | done
|
|---|
| 371 | done
|
|---|
| 372 | for node in $(grep -l ' a ' *.dep); do
|
|---|
| 373 | lines_to_remove=
|
|---|
| [28546ae] | 374 | echo Process "runtime" deps in $node
|
|---|
| [2140f22] | 375 | if ! [ -e ${node%.dep}groupxx.dep ]; then
|
|---|
| [e0bbc6e] | 376 | b=0 # Nothing depends on <node>groupxx
|
|---|
| [2140f22] | 377 | for parent in $(grep -l ${node%.dep}\$ *); do
|
|---|
| [e0bbc6e] | 378 | p=0 # No "after" dependency depends on this parent
|
|---|
| [2140f22] | 379 | for start in $(grep ' a ' $node | cut -d' ' -f3); do
|
|---|
| [e0bbc6e] | 380 | seen=" " # global variable used in "path_to"
|
|---|
| [2140f22] | 381 | if path_to ${start}.dep ${parent%.dep} 3; then p=1; break; fi
|
|---|
| 382 | done
|
|---|
| 383 | if test $p = 0; then
|
|---|
| [f1edc8e] | 384 | b=1
|
|---|
| [2140f22] | 385 | sed -i "s/\ ${node%.dep}\$/&groupxx/" $parent
|
|---|
| 386 | fi
|
|---|
| 387 | done
|
|---|
| 388 | echo "1 b ${node%.dep}" > ${node%.dep}groupxx.dep
|
|---|
| [f1edc8e] | 389 | if test $b = 0; then echo "1 b ${node%.dep}groupxx" >> root.dep; fi
|
|---|
| [2140f22] | 390 | fi
|
|---|
| 391 | {
|
|---|
| 392 | while read prio_of_dep build_of_dep id_of_dep; do
|
|---|
| 393 | if test $build_of_dep = a; then
|
|---|
| 394 | if ! grep -q ${id_of_dep} ${node%.dep}groupxx.dep; then
|
|---|
| 395 | echo "$prio_of_dep b ${id_of_dep}" >> ${node%.dep}groupxx.dep
|
|---|
| 396 | fi
|
|---|
| 397 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| 398 | fi
|
|---|
| 399 | done
|
|---|
| 400 | } <$node
|
|---|
| 401 | for id_of_dep in $lines_to_remove; do
|
|---|
| [5156f51] | 402 | sed "/a\ $id_of_dep\$/d" -i $node
|
|---|
| [2140f22] | 403 | done
|
|---|
| 404 | done
|
|---|
| 405 | for node in $(grep -l ' f ' *); do
|
|---|
| [28546ae] | 406 | echo Process "first" deps in $node
|
|---|
| [2140f22] | 407 | lines_to_change=
|
|---|
| 408 | {
|
|---|
| 409 | while read prio_of_dep build_of_dep id_of_dep; do
|
|---|
| 410 | if test $build_of_dep = f; then
|
|---|
| 411 | if ! test -f ${id_of_dep}-pass1.dep; then
|
|---|
| 412 | cp ${id_of_dep}{,-pass1}.dep;
|
|---|
| 413 | fi
|
|---|
| 414 | lines_to_change="$lines_to_change $id_of_dep"
|
|---|
| [e0bbc6e] | 415 | unset lr # lines to remove in -pass1
|
|---|
| [2140f22] | 416 | {
|
|---|
| 417 | while read p b start; do
|
|---|
| [e0bbc6e] | 418 | seen=" " # global variable used in "path_to"
|
|---|
| [2140f22] | 419 | if path_to ${start}.dep ${node%.dep} $p; then
|
|---|
| 420 | lr="$lr $start"
|
|---|
| 421 | fi
|
|---|
| 422 | done
|
|---|
| 423 | } < ${id_of_dep}-pass1.dep
|
|---|
| 424 | for p in $lr; do
|
|---|
| 425 | sed "/\ $p\$/d" -i ${id_of_dep}-pass1.dep
|
|---|
| 426 | done
|
|---|
| 427 | fi
|
|---|
| 428 | done
|
|---|
| 429 | } <$node
|
|---|
| 430 | for id_of_dep in $lines_to_change; do
|
|---|
| [d80302b] | 431 | sed "/\ $id_of_dep\$/"'{s/[[:digit:]] f /1 b /;s/$/-pass1/}' -i $node
|
|---|
| [141d072] | 432 | if ! grep -q " $id_of_dep\$" *.dep; then
|
|---|
| 433 | echo 1 b $id_of_dep >>root.dep
|
|---|
| 434 | fi
|
|---|
| [2140f22] | 435 | done
|
|---|
| 436 | done
|
|---|
| 437 | } # End clean_subgraph
|
|---|
| 438 |
|
|---|
| 439 | #----------------------------#
|
|---|
| 440 | generate_dependency_tree() { #
|
|---|
| 441 | #----------------------------#
|
|---|
| 442 | : <<inline_doc
|
|---|
| 443 | function: Create a subtree of the dependency tree
|
|---|
| 444 | (recursive function)
|
|---|
| 445 | input vars: $1 : file with a list of targets (child nodes)
|
|---|
| 446 | the first line of the file is the link
|
|---|
| 447 | $2 : priority (1=req, 2=rec, 3=opt)
|
|---|
| [e4b1293] | 448 | returns: 0 if the tree has been successfully created
|
|---|
| 449 | 1 if we are backing up to the parent of a circular dep
|
|---|
| [2140f22] | 450 | and there are only required deps in the cycle
|
|---|
| 451 | 2 if we are backing up to the parent of a circular dep
|
|---|
| 452 | and there are recommended deps and no optional deps in the
|
|---|
| 453 | cycle
|
|---|
| 454 | 3 if we are backing up to the parent of a circular dep
|
|---|
| 455 | and there are optiional deps in the cycle
|
|---|
| [33ee66c] | 456 | modifies: vars: parentNode is set when return is not 0
|
|---|
| [e4b1293] | 457 | output: files: for each <pkg> with dependencies in $1,
|
|---|
| [2140f22] | 458 | a file <pkg>.tree and its dependencies
|
|---|
| [3c10176] | 459 | on error: nothing
|
|---|
| 460 | on success: nothing
|
|---|
| 461 | inline_doc
|
|---|
| 462 |
|
|---|
| [2140f22] | 463 | local depFile=$1
|
|---|
| [7dc8595] | 464 | local priority=$2
|
|---|
| [e576789] | 465 | local -a rootlink
|
|---|
| [7dc8595] | 466 | local -a priolink
|
|---|
| [e576789] | 467 | local -a otherlink
|
|---|
| 468 | local -i depth
|
|---|
| 469 | local -i count=0
|
|---|
| 470 | local id_of_dep
|
|---|
| [2140f22] | 471 | local build_of_dep
|
|---|
| 472 | local prio_of_dep
|
|---|
| [e576789] | 473 | local parent
|
|---|
| 474 | local lines_to_remove=
|
|---|
| 475 | local srootlink
|
|---|
| [7dc8595] | 476 | local priostring
|
|---|
| 477 | local dpriostring
|
|---|
| 478 | local i
|
|---|
| [e576789] | 479 |
|
|---|
| 480 | {
|
|---|
| [2140f22] | 481 | read -a rootlink
|
|---|
| [e576789] | 482 | depth=${#rootlink[*]}
|
|---|
| [2140f22] | 483 | read -a priolink
|
|---|
| [e576789] | 484 | srootlink="${rootlink[*]} "
|
|---|
| [7dc8595] | 485 | case $priority in
|
|---|
| 486 | 1) priostring=required ;;
|
|---|
| 487 | 2) priostring=recommended ;;
|
|---|
| 488 | 3) priostring=optional ;;
|
|---|
| 489 | esac
|
|---|
| [2140f22] | 490 | # start of depFile
|
|---|
| 491 | echo -en "\nNode: $depth${spaceSTR:0:$depth}${RED}${depFile%.tree}${OFF} $priostring"
|
|---|
| [e576789] | 492 |
|
|---|
| [2140f22] | 493 | while read prio_of_dep build_of_dep id_of_dep; do
|
|---|
| 494 | case $prio_of_dep in
|
|---|
| [7dc8595] | 495 | 1) dpriostring=required ;;
|
|---|
| 496 | 2) dpriostring=recommended ;;
|
|---|
| 497 | 3) dpriostring=optional ;;
|
|---|
| [2140f22] | 498 | esac
|
|---|
| [e576789] | 499 | # count entries in file
|
|---|
| 500 | (( count++ ))
|
|---|
| 501 | # Has this entry already been seen?
|
|---|
| [2140f22] | 502 | if [ -f ${id_of_dep}.tree ]; then # found ${id_of_dep}.tree already in tree
|
|---|
| 503 | otherlink=($(head -n 1 ${id_of_dep}.tree))
|
|---|
| [2e1c1c3] | 504 | if [ -z "${otherlink[*]}" ]
|
|---|
| [2140f22] | 505 | then echo otherlink empty for $id_of_dep.tree
|
|---|
| [e576789] | 506 | echo This should not happen, but happens to happen...
|
|---|
| 507 | exit 1
|
|---|
| 508 | fi
|
|---|
| [2140f22] | 509 | #Do not use "${rootlink[*]}" =~ "${otherlink[*]}": case rootlink=(1 11)
|
|---|
| [e576789] | 510 | # and otherlink=(1 1)
|
|---|
| [e4b1293] | 511 | if [[ ${srootlink#"${otherlink[*]} "} != ${srootlink} ]]; then # cir. dep
|
|---|
| [7dc8595] | 512 | echo -en "\nCirc: $((depth+1))${spaceSTR:0:$((depth+1))}${YELLOW}${id_of_dep}${OFF} $dpriostring"
|
|---|
| [2140f22] | 513 | # Find lowest priority in branch from parent to depFile:
|
|---|
| [7dc8595] | 514 | p2=0
|
|---|
| 515 | for (( i=${#otherlink[*]}; i < $depth ; i++ )) ; do
|
|---|
| 516 | if (( ${priolink[i]} > $p2 )); then p2=${priolink[i]}; fi
|
|---|
| 517 | done
|
|---|
| 518 | if (( $prio_of_dep >= $p2 )); then # prune
|
|---|
| [e4b1293] | 519 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| [2140f22] | 520 | sed -i "/$id_of_dep/d" ${depFile/.tree/.dep}
|
|---|
| 521 | else # find and set parent, then return lowest priority
|
|---|
| 522 | # The parent has the same link without the last entry.
|
|---|
| 523 | # We do not need otherlink anymore so just destroy the last element
|
|---|
| 524 | unset otherlink[-1]
|
|---|
| 525 | parentNode=$(grep ^"${otherlink[*]}"\$ -l *)
|
|---|
| 526 | return $p2
|
|---|
| [e4b1293] | 527 | fi
|
|---|
| [2140f22] | 528 | else # not circular: prune tree (but not .dep, since it may happen that
|
|---|
| [7ac11f0] | 529 | # the tree is destroyed and rebuilt in another order)
|
|---|
| [e576789] | 530 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| [e4b1293] | 531 | fi # circular or not
|
|---|
| 532 | continue # this dependency has already been seen, and the associated
|
|---|
| 533 | # subtree computed. We are done
|
|---|
| 534 | fi # Has this entry already been seen?
|
|---|
| [2140f22] | 535 | # So, this entry has not already been seen. Let's build the corresponding
|
|---|
| 536 | # subtree. First check there is a subtree...
|
|---|
| 537 | # Use -s, because it may happen that after removing lines, .dep exists
|
|---|
| [d7c07e0] | 538 | # but is empty.
|
|---|
| [2140f22] | 539 | if [[ -s ${id_of_dep}.dep ]]; then # this dependency has dependencies
|
|---|
| 540 | sed "1i${rootlink[*]} $count\\
|
|---|
| 541 | ${priolink[*]} $prio_of_dep" < ${id_of_dep}.dep \
|
|---|
| 542 | > ${id_of_dep}.tree # add link and priolink
|
|---|
| 543 | generate_dependency_tree ${id_of_dep}.tree $prio_of_dep
|
|---|
| [e576789] | 544 | # Test return value, in case we exchange dependencies
|
|---|
| [2140f22] | 545 | p2=$?
|
|---|
| 546 | case $p2 in
|
|---|
| 547 | 0) # Normal return
|
|---|
| 548 | ;;
|
|---|
| 549 | $prio_of_dep) # we remove this dep, but since it may become unreachable,
|
|---|
| 550 | # move it to be built later (as a dep of parent).
|
|---|
| 551 | tree_erase ${id_of_dep}.tree
|
|---|
| 552 | lines_to_remove="$lines_to_remove $id_of_dep"
|
|---|
| 553 | sed -i "/${id_of_dep}/d" ${depFile/.tree/.dep}
|
|---|
| 554 | echo "$prio_of_dep b $id_of_dep" >> $parentNode
|
|---|
| 555 | # must be added to .dep in case parentNode is destroyed when erasing
|
|---|
| 556 | # the tree
|
|---|
| 557 | echo "$prio_of_dep b $id_of_dep" >> ${parentNode/.tree/.dep}
|
|---|
| 558 | continue
|
|---|
| 559 | ;;
|
|---|
| 560 | *) # We are backing up
|
|---|
| 561 | return $p2
|
|---|
| 562 | ;;
|
|---|
| 563 | esac
|
|---|
| 564 | else # id_of_dep has no dependencies, just record the link in a file
|
|---|
| 565 | # and print
|
|---|
| 566 | echo "${rootlink[*]} $count" > ${id_of_dep}.tree
|
|---|
| 567 | echo -en "\nLeaf: $(($depth+1))${spaceSTR:0:$(($depth+1))}${CYAN}${id_of_dep}${OFF} $dpriostring"
|
|---|
| 568 | fi
|
|---|
| [e576789] | 569 | done
|
|---|
| [2140f22] | 570 | echo -en "\n End: $depth${spaceSTR:0:$depth}${GREEN}${depFile%.tree}${OFF}"
|
|---|
| 571 | } <$depFile
|
|---|
| [e576789] | 572 | # It may happen that a file is created with several times
|
|---|
| 573 | # the same line. Normally, all those lines but one
|
|---|
| 574 | # would be flagged to be removed (or all of them if
|
|---|
| [e4b1293] | 575 | # the dependency appeared before). A simple sed /$line/d
|
|---|
| [e576789] | 576 | # destroys all the lines. We should instead remove
|
|---|
| 577 | # only one for each appearance of it in lines_to_remove.
|
|---|
| [e4b1293] | 578 | # so first get the position of last line and then delete
|
|---|
| [e576789] | 579 | # that line
|
|---|
| 580 | for line in $lines_to_remove
|
|---|
| [2140f22] | 581 | do lineno=$(sed -n /^[[:digit:]]\ b\ $line\$/= $depFile | tail -n1)
|
|---|
| 582 | sed -i ${lineno}d $depFile
|
|---|
| [e576789] | 583 | done
|
|---|
| 584 | return 0
|
|---|
| 585 | }
|
|---|
| [3c10176] | 586 |
|
|---|
| [2140f22] | 587 |
|
|---|
| [e576789] | 588 | #---------------#
|
|---|
| 589 | tree_browse() { #
|
|---|
| 590 | #---------------#
|
|---|
| 591 | local file=$1
|
|---|
| 592 | local f
|
|---|
| 593 |
|
|---|
| 594 | #echo file=$file
|
|---|
| [7dc8595] | 595 | for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
|
|---|
| [e576789] | 596 | # echo f=$f
|
|---|
| [2140f22] | 597 | if grep -q '[^0-9 ]' ${f}.tree ; then
|
|---|
| 598 | tree_browse ${f}.tree
|
|---|
| [3c10176] | 599 | fi
|
|---|
| [e576789] | 600 | echo $f
|
|---|
| 601 | done
|
|---|
| 602 | }
|
|---|
| [3c10176] | 603 |
|
|---|
| [e576789] | 604 | #--------------#
|
|---|
| 605 | tree_erase() { #
|
|---|
| 606 | #--------------#
|
|---|
| 607 | local file=$1
|
|---|
| 608 | local f
|
|---|
| [6c8095a] | 609 | local rootlink
|
|---|
| [f37d08b] | 610 | local rootlink2
|
|---|
| [e576789] | 611 |
|
|---|
| 612 | #echo file=$file
|
|---|
| [6c8095a] | 613 | rootlink="$(head -n1 $file) "
|
|---|
| [7dc8595] | 614 | for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
|
|---|
| [2140f22] | 615 | if [ -f ${f}.tree ]; then
|
|---|
| 616 | rootlink2="$(head -n1 ${f}.tree) "
|
|---|
| [6c8095a] | 617 | # We want two things:
|
|---|
| 618 | # i) do not erase the file if it is in another branch
|
|---|
| 619 | # ii) do not erase the file if there is a circular dependency
|
|---|
| 620 | # for case i), we test that rootlink is contained in rootlink2
|
|---|
| 621 | # for case ii), we test that rootlink2 is not contained in
|
|---|
| 622 | # rootlink.
|
|---|
| [f37d08b] | 623 | # See comment above about srootlink
|
|---|
| [6c8095a] | 624 | if [[ ${rootlink2#${rootlink}} != ${rootlink2} &&
|
|---|
| 625 | ${rootlink#${rootlink2}} == ${rootlink} ]] ; then
|
|---|
| [2140f22] | 626 | tree_erase ${f}.tree
|
|---|
| [e576789] | 627 | fi
|
|---|
| 628 | fi
|
|---|
| 629 | done
|
|---|
| 630 | rm -f $file
|
|---|
| [3c10176] | 631 | }
|
|---|
