110 lines
2.9 KiB
Bash
Executable File
110 lines
2.9 KiB
Bash
Executable File
#!/bin/sh
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#
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# This script has been shamelessly copied and tweaked from original copy:
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#
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# https://github.com/openstack/oslo-incubator/blob/master/tools/graduate.sh
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#
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# Use this script to export a Neutron module to a separate git repo.
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#
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# You can call this script Call script like so:
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#
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# ./split.sh <path to file containing list of files to export> <project name>
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#
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# The file should be a text file like the one below:
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#
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# /path/to/file/file1
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# /path/to/file/file2
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# ...
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# /path/to/file/fileN
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#
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# Such a list can be generated with a command like this:
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#
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# find $path -type f # path is the base dir you want to list files for
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set -e
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if [ $# -lt 2 ]; then
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echo "Usage $0 <path to file containing list of files to export> <project name>"
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exit 1
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fi
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set -x
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file_list_path="$1"
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project_name="$2"
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files_to_keep=$(cat $file_list_path)
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# Build the grep pattern for ignoring files that we want to keep
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keep_pattern="\($(echo $files_to_keep | sed -e 's/^/\^/' -e 's/ /\\|\^/g')\)"
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# Prune all other files in every commit
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pruner="git ls-files | grep -v \"$keep_pattern\" | git update-index --force-remove --stdin; git ls-files > /dev/stderr"
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# Find all first commits with listed files and find a subset of them that
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# predates all others
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roots=""
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for file in $files_to_keep; do
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file_root=$(git rev-list --reverse HEAD -- $file | head -n1)
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fail=0
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for root in $roots; do
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if git merge-base --is-ancestor $root $file_root; then
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fail=1
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break
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elif !git merge-base --is-ancestor $file_root $root; then
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new_roots="$new_roots $root"
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fi
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done
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if [ $fail -ne 1 ]; then
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roots="$new_roots $file_root"
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fi
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done
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# Purge all parents for those commits
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set_roots="
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if [ 1 -eq 0 $(for root in $roots; do echo " -o \"\$GIT_COMMIT\" = '$root' "; done) ]; then
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echo '';
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else
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cat;
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fi"
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# Enhance git_commit_non_empty_tree to skip merges with:
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# a) either two equal parents (commit that was about to land got purged as well
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# as all commits on mainline);
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# b) or with second parent being an ancestor to the first one (just as with a)
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# but when there are some commits on mainline).
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# In both cases drop second parent and let git_commit_non_empty_tree to decide
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# if commit worth doing (most likely not).
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skip_empty=$(cat << \EOF
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if [ $# = 5 ] && git merge-base --is-ancestor $5 $3; then
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git_commit_non_empty_tree $1 -p $3
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else
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git_commit_non_empty_tree "$@"
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fi
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EOF
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)
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# Filter out commits for unrelated files
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echo "Pruning commits for unrelated files..."
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git filter-branch \
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--index-filter "$pruner" \
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--parent-filter "$set_roots" \
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--commit-filter "$skip_empty" \
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--tag-name-filter cat \
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-- --all
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# Generate the new .gitreview file
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echo "Generating new .gitreview file..."
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cat > .gitreview <<EOF
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[gerrit]
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host=review.openstack.org
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port=29418
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project=stackforge/${project_name}.git
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EOF
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git add . && git commit -m "Generated new .gitreview file for ${project_name}"
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echo "Done."
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