114 lines
5.1 KiB
Markdown
114 lines
5.1 KiB
Markdown
PACKING ALGORITHM
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=================
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Begin with a list of content set paths:
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```
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/content/dist/rhel/$releasever/$basearch/os
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/content/dist/rhel/$releasever/$basearch/debug
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/content/dist/rhel/$releasever/$basearch/source/SRPMS
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/content/dist/jboss/source
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/content/beta/rhel/$releasever/$basearch/os
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/content/beta/rhel/$releasever/$basearch/debug
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/content/beta/rhel/$releasever/$basearch/source/SRPMS
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```
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Create a prefix tree out of the paths, where each node in the tree contains the
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names of its children, rather than the children containing its own name:
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```
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+-------+ +------+
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|-------+ |------|
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|content+--+-------+ |source+-+---+
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+-------+ | | +------+ | |
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|-------| | |---|
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|dist +--------+-------+ | +---+
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+--+beta | | | |
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| +-------+ |-------| |
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| |jboss +--+
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+-------+ |rhel +--+
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| | +-------+ |
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|-------| |
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|rhel +--+-----------+ +-----------+
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+-------+ | | | |
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|-----------| |-----------|
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+----------+$releasever| |$releasever+--+
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| +-----------+ +-----------+ |
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+---------+ +---------+
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|---------| |---------|
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|$basearch+--+ +--+$basearch| +---+
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+---------+ | | +---------+ | |
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+--------+ +-------+ +---+
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|--------| |-------| |
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+---+--------+os | |os +---------+
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| | +--+debug | |debug +-----------+---+
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|---| | |source +--+ |source +--+ | |
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+---+ | +--------+ | +-------+ | |---|
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| | | +---+
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+---+ +------+ |
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| | | | +-----+
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|---| |------| | |
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+---+ +--+SRPMS | |-----|
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| +------+ |SRPMS+--+---+
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| +-----+ | |
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+---+ |---|
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| | +---+
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|---|
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+---+
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```
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This eliminates the duplication in the prefixes of our paths. We now only have
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one instance of the word "content", for example. We now find any duplicate
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subtrees, remove the duplicate, and point all references from the duplicate to
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the original:
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```
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+-------+ +------+
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| | | |
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|-------+ |------|
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|content+--+-------+ |source+-+
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+-------+ | | +------+ |
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|-------| | |
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|dist +--------+-------+ | |
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+--+beta | | | | |
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| +-------+ |-------| | |
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| |jboss +--+ |
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+-------+-------------------+rhel | |
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| | +-------+ |
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|-------| |
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|rhel +--+-----------+ |
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+-------+ | | |
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|-----------| |
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+----------+$releasever| |
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| +-----------+ |
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+---------+ |
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|---------| |
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|$basearch+--+ |
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+---------+ | |
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+--------+ |
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|--------| |
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+-------+os | |
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| +--+debug | |
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| | |source +--+ |
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| | +--------+ | |
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| | | |
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| | +------+ |
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| +-------+ | | |
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| | |------| |
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| | +--+SRPMS | |
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| | | +------+ |
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+------------+---+-------------------------+
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|---|
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+---+
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```
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