97149ff8db
This should be done so that any attributes for ignoring certain files when exporting can be appended to the file during the extraction step, but ignored in the actual import. Necessary for importing the gitsetup repository.
164 lines
5.3 KiB
Bash
164 lines
5.3 KiB
Bash
#=============================================================================
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# Copyright 2015-2016 Kitware, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#=============================================================================
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########################################################################
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# Script for updating third party packages.
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#
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# This script should be sourced in a project-specific script which sets
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# the following variables:
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#
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# name
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# The name of the project.
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# ownership
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# A git author name/email for the commits.
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# subtree
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# The location of the thirdparty package within the main source
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# tree.
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# repo
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# The git repository to use as upstream.
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# tag
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# The tag, branch or commit hash to use for upstream.
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# shortlog
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# Optional. Set to 'true' to get a shortlog in the commit message.
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#
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# Additionally, an "extract_source" function must be defined. It will be
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# run within the checkout of the project on the requested tag. It should
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# should place the desired tree into $extractdir/$name-reduced. This
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# directory will be used as the newest commit for the project.
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#
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# For convenience, the function may use the "git_archive" function which
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# does a standard "git archive" extraction using the (optional) "paths"
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# variable to only extract a subset of the source tree.
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########################################################################
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########################################################################
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# Utility functions
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########################################################################
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git_archive () {
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git archive --worktree-attributes --prefix="$name-reduced/" HEAD -- $paths | \
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tar -C "$extractdir" -x
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}
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die () {
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echo >&2 "$@"
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exit 1
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}
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warn () {
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echo >&2 "warning: $@"
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}
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readonly regex_date='20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]'
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readonly basehash_regex="$name $regex_date ([0-9a-f]*)"
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readonly basehash="$( git rev-list --author="$ownership" --grep="$basehash_regex" -n 1 HEAD )"
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readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p}' | egrep '^[0-9a-f]+$' )"
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########################################################################
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# Sanity checking
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########################################################################
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[ -n "$name" ] || \
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die "'name' is empty"
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[ -n "$ownership" ] || \
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die "'ownership' is empty"
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[ -n "$subtree" ] || \
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die "'subtree' is empty"
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[ -n "$repo" ] || \
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die "'repo' is empty"
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[ -n "$tag" ] || \
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die "'tag' is empty"
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[ -n "$basehash" ] || \
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warn "'basehash' is empty; performing initial import"
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readonly do_shortlog="${shortlog-false}"
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readonly workdir="$PWD/work"
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readonly upstreamdir="$workdir/upstream"
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readonly extractdir="$workdir/extract"
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[ -d "$workdir" ] && \
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die "error: workdir '$workdir' already exists"
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trap "rm -rf '$workdir'" EXIT
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# Get upstream
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git clone "$repo" "$upstreamdir"
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if [ -n "$basehash" ]; then
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# Use the existing package's history
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git worktree add "$extractdir" "$basehash"
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# Clear out the working tree
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pushd "$extractdir"
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git ls-files | xargs rm -v
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find . -type d -empty -delete
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popd
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else
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# Create a repo to hold this package's history
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mkdir -p "$extractdir"
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git -C "$extractdir" init
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fi
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# Extract the subset of upstream we care about
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pushd "$upstreamdir"
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git checkout "$tag"
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readonly upstream_hash="$( git rev-parse HEAD )"
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readonly upstream_hash_short="$( git rev-parse --short=8 "$upstream_hash" )"
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readonly upstream_datetime="$( git rev-list "$upstream_hash" --format='%ci' -n 1 | grep -e "^$regex_date" )"
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readonly upstream_date="$( echo "$upstream_datetime" | grep -o -e "$regex_date" )"
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if $do_shortlog && [ -n "$basehash" ]; then
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readonly commit_shortlog="
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Upstream Shortlog
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-----------------
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$( git shortlog --no-merges --abbrev=8 --format='%h %s' "$upstream_old_short".."$upstream_hash" )"
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else
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readonly commit_shortlog=""
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fi
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extract_source || \
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die "failed to extract source"
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popd
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[ -d "$extractdir/$name-reduced" ] || \
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die "expected directory to extract does not exist"
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readonly commit_summary="$name $upstream_date ($upstream_hash_short)"
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# Commit the subset
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pushd "$extractdir"
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mv -v "$name-reduced/"* .
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rmdir "$name-reduced/"
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git add -A .
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git commit -n --author="$ownership" --date="$upstream_datetime" -F - <<-EOF
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$commit_summary
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Code extracted from:
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$repo
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at commit $upstream_hash ($tag).$commit_shortlog
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EOF
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git branch -f "upstream-$name"
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popd
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# Merge the subset into this repository
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if [ -n "$basehash" ]; then
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git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
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else
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git fetch "$extractdir" "upstream-$name:upstream-$name"
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git merge --log -s ours --no-commit "upstream-$name"
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git read-tree -u --prefix="$subtree/" "upstream-$name"
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fi
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git commit --no-edit
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git branch -d "upstream-$name"
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