285 lines
12 KiB
Bash
285 lines
12 KiB
Bash
#!/bin/bash
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#
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# $Id$
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#
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#---------------------------------------------------------------------------#
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# This is a set of (recursive) functions for manipulating a dependency #
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# tree. Everything would be "simple" without circular dependencies. We #
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# would just have to build the tree using the packages.xml file, and to #
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# provide a function for browsing it. But we need to be able to detect #
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# circular dependencies and to possibly change the tree depending on #
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# priorities. This is why we keep with each node a record of the path #
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# from the root to the node, which we call *link* and a record of the #
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# successive priorities which we call *priolink*. #
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# #
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# Layout of the tree: #
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# #
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# A node of the tree is represented by a file <nodeName>.dep. We keep all #
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# those files in the same directory. The root node file is "root.dep". #
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# Files <nodeName>.dep have the following layout: #
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# - the first line is the link: the link is an array of numbers #
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# (n1 n2 ... nN), describing the path from the root to <nodeName>: n1 #
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# is the position of the first node of the path in root.dep, n2 is the #
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# position of the second node of the path in <node1>.dep and so on. The #
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# link is not needed for normal tree operations (building a subtree or #
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# browsing the tree), but it allows to check whether a dependency is #
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# circular, and to find its parent. #
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# - the second line is an array of priorities (p1 p2 ... pN), giving the #
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# priority (1=required, 2=recommended, 3=optional) of each dependency #
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# in the link. #
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# - each subsequent line is of the form "p <depname>", where p is the #
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# priority as above, and <depname> is the name of the dependency. The #
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# position which is recorded in the link is the number of the line #
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# minus 2. #
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# #
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# Circular dependencies: #
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# #
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# In case we find a cirdular dependency, it has the form : #
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# parent->dependency_0->...->dependency_n->dependency_0 #
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# If we want to build dependency_n before dependency_0, no problem: #
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# we just prune the tree at dependency_n. If we want to build first #
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# dependency_0, we need to put dependency_n as a dependency of parent, #
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# then erase and rebuild the subtree from there. Now, we may have met #
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# another circular dependency in the subtree, and erasing the tree makes #
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# us forget the decision which was made. So, after first generating the #
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# list of dependencies from packages.xml, we keep the generated list in #
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# a file <nodeName>.odep, which we modify according to the decision which #
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# was made. #
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#---------------------------------------------------------------------------#
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# Global variables:
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# A string of spaces for indenting:
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declare -a spaceSTR=" "
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# When we are backing up from a circular dependency, `exchange_triplet'
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# shall contain (parent dependency_0 dependency_n):
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declare -a exchange_triplet
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#----------------------------#
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generate_dependency_tree() { #
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#----------------------------#
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: <<inline_doc
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function: Create a subtree of the dependency tree
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(recursive function)
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input vars: $1 : file with a list of targets (child nodes)
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the first line of the file is the link
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$2 : priority (1=req, 2=rec, 3=opt)
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externals: vars: DEP_LEVEL contains 1 if we want to build the
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tree only for required dependencies,
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2 if we want also recommended ones,
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and 3 if we want optional ones too.
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MAIL_SERVER contains the name of the MTA we want to use.
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files: ../xsl/dependencies.xsl: stylesheet for creating the
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.dep files
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../packages.xml: Files containing packages id
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and dependencies
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returns: 0 if the tree has been successfully created
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1 if we are backing up to the parent of a circular dep
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modifies: vars: exchange_triplet contains the triplet when return is 1
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output: files: for each <pkg> with dependencies in $1,
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a file <pkg>.dep and its dependencies
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on error: nothing
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on success: nothing
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inline_doc
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local DepFile=$1
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local priority=$2
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local -a rootlink
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local -a priolink
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local -a otherlink
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local -i depth
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local -i count=0
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local id_of_dep
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local parent
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local lines_to_remove=
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local srootlink
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local dep_level
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local priostring
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local dpriostring
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local i
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{
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# We use fd number 6 for input from DepFile, because we need 0 for user input
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read -u6 -a rootlink
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depth=${#rootlink[*]}
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read -u6 -a priolink
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dep_level=$DEP_LEVEL
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# For now, process optional deps only for the root packages.
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if (( $DEP_LEVEL > 2 )) && (( $depth > 1 )); then dep_level=2; fi
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srootlink="${rootlink[*]} "
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case $priority in
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1) priostring=required ;;
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2) priostring=recommended ;;
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3) priostring=optional ;;
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esac
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# start of DepFile
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echo -en "\nNode: $depth${spaceSTR:0:$depth}${RED}$DepFile${OFF} $priostring"
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while read -u6 prio_of_dep id_of_dep; do
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case $prio_of_dep in
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1) dpriostring=required ;;
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2) dpriostring=recommended ;;
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3) dpriostring=optional ;;
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esac
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# count entries in file
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(( count++ ))
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# Has this entry already been seen?
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if [ -f ${id_of_dep}.dep ]; then # found ${id_of_dep}.dep already in tree
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otherlink=($(head -n 1 ${id_of_dep}.dep))
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if [ -z "${otherlink[*]}" ]
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then echo otherlink empty for $id_of_dep.dep
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echo This should not happen, but happens to happen...
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exit 1
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fi
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# Do not use "${rootlink[*]}" =~ "${otherlink[*]}": case rootlink=(1 11)
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# and otherlink=(1 1)
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if [[ ${srootlink#"${otherlink[*]} "} != ${srootlink} ]]; then # cir. dep
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echo -en "\nCirc: $((depth+1))${spaceSTR:0:$((depth+1))}${YELLOW}${id_of_dep}${OFF} $dpriostring"
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# First look for the other parent of this dependency.
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# The parent has the same link without the last entry.
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# We do not need otherlink anymore so just destroy the last element
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unset otherlink[-1]
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parent=$(grep ^"${otherlink[*]}"\$ -l *)
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parent=${parent%.dep}
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# Find lowest priority in branch from parent to DepFile:
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p2=0
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for (( i=${#otherlink[*]}; i < $depth ; i++ )) ; do
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if (( ${priolink[i]} > $p2 )); then p2=${priolink[i]}; fi
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done
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if (( $prio_of_dep >= $p2 )); then # prune
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lines_to_remove="$lines_to_remove $id_of_dep"
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sed -i "/$id_of_dep/d" ${DepFile/.dep/.odep}
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else #backup with prio priority
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exchange_triplet=($parent $id_of_dep ${DepFile%.dep})
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return $priority
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fi
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else # not circular: prune tree (but not .odep, since it may happen that
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# the tree is destroyed and rebuilt in another order)
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lines_to_remove="$lines_to_remove $id_of_dep"
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fi # circular or not
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continue # this dependency has already been seen, and the associated
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# subtree computed. We are done
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fi # Has this entry already been seen?
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# So, this entry has not already been seen. Let's build the corresponding
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# subtree. Since decisions about circular deps can lead us to start again
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# dependencies, we restart until the flag is false.
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flag=true
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while [ $flag = true ]; do
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flag=false
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if [ ! -f "${id_of_dep}.odep" ]; then
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xsltproc --stringparam dependencies ${dep_level} \
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--stringparam idofdep $id_of_dep \
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--stringparam MTA $MAIL_SERVER \
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-o ${id_of_dep}.odep \
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../xsl/dependencies.xsl ../packages.xml
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fi
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# Use -s, because it may happen that after removing lines, .odep exists
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# but is empty.
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if [[ -s ${id_of_dep}.odep ]]; then # this dependency has dependencies
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sed "1i${rootlink[*]} $count\\
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${priolink[*]} $prio_of_dep" < ${id_of_dep}.odep \
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> ${id_of_dep}.dep # add link and priolink
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generate_dependency_tree ${id_of_dep}.dep $prio_of_dep
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# Test return value, in case we exchange dependencies
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p2=$?
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case $p2 in
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0) # Normal return
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;;
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[123]) # We are backing up to parent
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if [[ ${exchange_triplet} == ${DepFile%.dep} ]] ; then
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# We are the parent!
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# First, we have to find the parent of our new direct dep, and remove
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# the new direct dep from the parent.odep:
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otherlink=($(head -n1 ${exchange_triplet[2]}.dep))
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unset otherlink[-1]
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parent=$(grep -l ^"${otherlink[*]}"\$ *.dep)
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sed -i /[[:digit:]]\ ${exchange_triplet[2]}\$/d ${parent/.dep/.odep}
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tree_erase ${id_of_dep}.dep
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# We want that our direct dep be ${exchange_triplet[2]} and that id_of_dep
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# be pulled in as an indirect dep, so exchange.
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# Just doing a sed -i "s@${id_of_dep}@${exchange_triplet[2]}@" $DepFile
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# is not good if $DepFile contains several times the same line
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# so first find the first line and then sed
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lineno=$(sed -n /${id_of_dep}/= $DepFile | head -n1)
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sed -i "${lineno}s@${id_of_dep}@${exchange_triplet[2]}@" $DepFile
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# Do the same for the odep file:
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local OdepFile=${DepFile/.dep/.odep}
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lineno=$(sed -n /${id_of_dep}/= $OdepFile | head -n1)
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sed -i "${lineno}s@${id_of_dep}@${exchange_triplet[2]}@" $OdepFile
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id_of_dep=${exchange_triplet[2]}
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flag=true # we have to regenerate the tree for the new dependency
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else
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# We are not the parent. If our priority is greater than p2
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# we have to change the triplet and return priority, else return current p2.
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# echo (DEBUG) backing up to ${exchange_triplet} at ${DepFile%.dep}
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if (( $priority > $p2 )); then
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exchange_triplet[2]=${DepFile%.dep}
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return $priority
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else
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return $p2
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fi
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fi
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;;
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esac
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else # id_of_dep has no dependencies, just record the link in a file
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# and print
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echo "${rootlink[*]} $count" > ${id_of_dep}.dep
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echo -en "\nLeaf: $(($depth+1))${spaceSTR:0:$(($depth+1))}${CYAN}${id_of_dep}${OFF} $dpriostring"
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fi
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done
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done
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echo -en "\n End: $depth${spaceSTR:0:$depth}${GREEN}$DepFile${OFF}"
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} 6<$DepFile
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# It may happen that a file is created with several times
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# the same line. Normally, all those lines but one
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# would be flagged to be removed (or all of them if
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# the dependency appeared before). A simple sed /$line/d
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# destroys all the lines. We should instead remove
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# only one for each appearance of it in lines_to_remove.
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# so first get the position of last line and then delete
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# that line
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for line in $lines_to_remove
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do lineno=$(sed -n /^[[:digit:]]\ $line\$/= $DepFile | tail -n1)
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sed -i ${lineno}d $DepFile
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done
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return 0
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}
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#---------------#
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tree_browse() { #
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#---------------#
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local file=$1
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local f
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#echo file=$file
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for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
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# echo f=$f
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if grep -q '[^0-9 ]' ${f}.dep ; then
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tree_browse ${f}.dep
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fi
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echo $f
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done
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}
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#--------------#
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tree_erase() { #
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#--------------#
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local file=$1
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local f
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local -a rootlink
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local -a rootlink2
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#echo file=$file
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rootlink=($(head -n1 $file))
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for f in $(grep '[^0-9 ]' $file | sed 's/.* //'); do
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# echo " f"=$f
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if [ -f ${f}.dep ]; then
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rootlink2=($(head -n1 ${f}.dep))
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if [[ "${rootlink2[*]}" =~ "${rootlink[*]}" ]] ; then
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tree_erase ${f}.dep
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fi
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fi
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done
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rm -f $file
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}
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