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e002a16ba5
This adds the ability to actually create delta objects using a new tool: git-mkdelta. It uses an ordered list of potential objects to deltafy against earlier objects in the list. A cap on the depth of delta references can be provided as well, otherwise the default is to not have any limit. A limit of 0 will also undeltafy any given object. Also provided is the beginning of a script to deltafy an entire repository. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
40 lines
1.1 KiB
Bash
40 lines
1.1 KiB
Bash
#!/bin/bash
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# Script to deltafy an entire GIT repository based on the commit list.
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# The most recent version of a file is the reference and previous versions
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# are made delta against the best earlier version available. And so on for
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# successive versions going back in time. This way the delta overhead is
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# pushed towards older version of any given file.
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#
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# NOTE: the "best earlier version" is not implemented in mkdelta yet
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# and therefore only the next eariler version is used at this time.
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#
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# TODO: deltafy tree objects as well.
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#
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# The -d argument allows to provide a limit on the delta chain depth.
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# If 0 is passed then everything is undeltafied.
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set -e
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depth=
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[ "$1" == "-d" ] && depth="--max-depth=$2" && shift 2
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curr_file=""
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git-rev-list HEAD |
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git-diff-tree -r --stdin |
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sed -n '/^\*/ s/^.*->\(.\{41\}\)\(.*\)$/\2 \1/p' | sort | uniq |
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while read file sha1; do
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if [ "$file" == "$curr_file" ]; then
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list="$list $sha1"
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else
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if [ "$list" ]; then
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echo "Processing $curr_file"
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echo "$head $list" | xargs git-mkdelta $depth -v
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fi
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curr_file="$file"
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list=""
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head="$sha1"
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fi
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done
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