103 lines
3.2 KiB
Bash
Executable File
103 lines
3.2 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Copyright 2016 Google Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2 of the License.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# $0 from-branch to-branch
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#
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# applies all commits that from-branch has over to-branch,
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# based on a common ancestor and gerrit meta-data
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from=$1
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to=$2
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# match string: this is the git commit line that is used to
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# identify commits that were already copied over.
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#
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# Must not contain spaces except for leading and trailing.
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#
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# The first pick was Change-Id, but it was lost too often,
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# so go for Reviewed-on instead. It's also unique because it
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# contains the gerrit instance's host name and the change's number
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# on that system.
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match_string='[-A-Za-z]*[Rr]eviewed-on:'
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# Custom root: allow a certain CL (identified by matching either side's
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# match_string) to be the new root, instead of using git's common history only.
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# This allows cutting down on commits that are re-evaluated on every run.
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#
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# Use:
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# To the commit message of a commit on the "to" side, add
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# $custom_root: match_string (the part coming after $match_string)
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#
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# For a $match_string of ~ "Reviewed-on: " this might
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# be "$custom_root: https://example.com/12345"
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#
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# On traversal, the commit with "$match_string: https://example.com/12345"
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# is then considered a base commit.
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custom_root='^Gerrit-Rebase-Ignore-CLs-Before:'
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# fetch common ancestor
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common_base=$(git merge-base ${from} ${to} 2>/dev/null)
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if [ -z "${common_base}" ]; then
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echo \"${from}\" or \"${to}\" is not a valid branch name.
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exit 1
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fi
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from_base=$common_base
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# fetch custom root ID
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croot_marker=$(git log --pretty=%b -1 --grep "${custom_root}" \
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${common_base}..${to} | \
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grep "${custom_root}" | cut -d: -f2-)
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if [ -n "${croot_marker}" ]; then
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from_base=$( ( \
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git log --pretty=%H -1 \
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--grep "^${match_string}${croot_marker}" \
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${from_base}..${from}; echo ${from_base} )| head -1)
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fi
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# collect matches that are present on the target side
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to_matches="$(git log ${common_base}..${to} | \
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grep "^ ${match_string}" | \
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cut -d: -f2-)"
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# start rebase process, but fail immediately by enforcing an invalid todo
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GIT_SEQUENCE_EDITOR="echo foo >" \
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git rebase -i --onto ${to} ${from} ${to} 2>/dev/null
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# write new rebase todo
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# the appended "commit" line triggers handling of the last log entry
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commit=""
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(git log --reverse ${from_base}..${from} | \
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grep -E "(^commit [0-9a-f]{40}\$|^ ${match_string})"; \
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echo "commit") | \
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while read key value; do
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if [ "${key}" = "commit" ]; then
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if [ -n "${commit}" ]; then
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git log -n 1 --pretty="pick %h %s" ${commit}
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fi
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commit="${value}"
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else
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# if value was already found on the "to" side, skip this
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# commit
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if [[ ${to_matches} == *"${value}"* ]]; then
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commit=""
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fi
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fi
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done | GIT_SEQUENCE_EDITOR="cat >" git rebase --edit-todo
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# allow user to edit todo
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git rebase --edit-todo
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# start processing todo to mimick git rebase -i behavior
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git rebase --continue
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