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http://git.haproxy.org/git/haproxy.git/
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b27470fd1d
git-show-backports lists a git-show command which can be used to inspect all commits subject to backport. This command specifies formatting option to reproduce default git-show output, especially for commit messages indented with 4 spaces character. However, it also add wrapping on message line longer than 72 characters. This reduce lisibility of messages where large info are written such as backtraces. Improve this by changing git-show format option. Use a limit value of 0 to disable wrapping while preserving indentation. This could be backported to every stable version to simplify backporting process.
337 lines
10 KiB
Bash
Executable File
337 lines
10 KiB
Bash
Executable File
#!/usr/bin/env bash
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#
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# Compares multiple branches against a reference and shows which ones contain
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# each commit, and the level of backports since the origin or its own ancestors.
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#
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# Copyright (c) 2016 Willy Tarreau <w@1wt.eu>
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#
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# The purpose is to make it easy to visualize what backports might be missing
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# in a maintenance branch, and to easily spot the ones that are needed and the
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# ones that are not. It solely relies on the "cherry-picked from" tags in the
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# commit messages to find what commit is available where, and can even find a
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# reference commit's ancestor in another branch's commit ancestors as well to
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# detect that the patch is present. When done with the proper references and
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# a correct ordering of the branches, it can be used to quickly apply a set of
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# fixes to a branch since it dumps suggested commands at the end. When doing
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# so it is a good idea to use "HEAD" as the last branch to avoid doing mistakes.
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#
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# Examples :
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# - find what's in master and not in current branch :
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# show-backports -q -m -r master HEAD
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# - find what's in 1.6/master and in hapee-maint-1.5r2 but not in current branch :
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# show-backports -q -m -r 1.6/master hapee-maint-1.5r2 HEAD | grep ' [a-f0-9]\{8\}[-+][0-9] '
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# - check that no recent fix from master is missing in any maintenance branch :
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# show-backports -r master hapee-maint-1.5r2 aloha-7.5 hapee-maint-1.5r1 aloha-7.0
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# - see what was recently merged into 1.6 and has no equivalent in local master :
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# show-backports -q -m -r 1.6/master -b "1.6/master@{1 week ago}" master
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# - check what extra backports are present in hapee-r2 compared to hapee-r1 :
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# show-backports -q -m -r hapee-r2 hapee-r1
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USAGE="Usage: ${0##*/} [-q] [-H] [-m] [-u] [-r reference] [-l logexpr] [-s subject] [-b base] {branch|range} [...] [-- file*]"
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BASES=( )
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BRANCHES=( )
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REF=
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BASE=
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QUIET=
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LOGEXPR=
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SUBJECT=
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MISSING=
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UPSTREAM=
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BODYHASH=
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die() {
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[ "$#" -eq 0 ] || echo "$*" >&2
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exit 1
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}
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err() {
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echo "$*" >&2
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}
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quit() {
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[ "$#" -eq 0 ] || echo "$*"
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exit 0
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}
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short() {
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# git rev-parse --short $1
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echo "${1::8}"
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}
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dump_commit_matrix() {
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title=":$REF:"
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for branch in "${BRANCHES[@]}"; do
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#echo -n " $branch"
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title="$title :${branch}:"
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done
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title="$title |"
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count=0
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# now look up commits
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while read ref subject; do
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if [ -n "$MISSING" -a "${subject:0:9}" = "[RELEASE]" ]; then
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continue
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fi
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upstream="none"
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missing=0
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refbhash=""
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line=""
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for branch in "${BRANCHES[@]}"; do
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set -- $(grep -m 1 $ref "$WORK/${branch//\//_}")
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newhash=$1 ; shift
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bhash=""
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# count the number of cherry-picks after this one. Since we shift,
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# the result is in "$#"
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while [ -n "$1" -a "$1" != "$ref" ]; do
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shift
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done
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if [ -n "$newhash" ]; then
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line="${line} $(short $newhash)-$#"
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else
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# before giving up we can check if our current commit was
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# itself cherry-picked and check this again. In order not
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# to have to do it all the time, we can cache the result
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# for the current line. If a match is found we report it
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# with the '+' delimiter instead of '-'.
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if [ "$upstream" = "none" ]; then
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upstream=( $(git log -1 --pretty --format=%B "$ref" | \
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sed -n 's/^commit \([^)]*\) upstream\.$/\1/p;s/^(cherry picked from commit \([^)]*\))/\1/p') )
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fi
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newhash=""
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for h in ${upstream[@]}; do
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set -- $(grep -m 1 $h "$WORK/${branch//\//_}")
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newhash=$1 ; shift
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while [ -n "$1" -a "$1" != "$h" ]; do
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shift
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done
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if [ -n "$newhash" ]; then
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line="${line} $(short $newhash)+$#"
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break
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fi
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done
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if [ -z "$newhash" -a -n "$BODYHASH" ]; then
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if [ -z "$refbhash" ]; then
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refbhash=$(git log -1 --pretty="%an|%ae|%at|%B" "$ref" | sed -n '/^\(Signed-off-by\|(cherry picked\)/q;p' | md5sum)
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fi
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set -- $(grep -m 1 "H$refbhash\$" "$WORK/${branch//\//_}")
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newhash=$1 ; shift
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if [ -n "$newhash" ]; then
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line="${line} $(short $newhash)+?"
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break
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fi
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fi
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if [ -z "$newhash" ]; then
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line="${line} -"
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missing=1
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fi
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fi
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done
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line="${line} |"
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if [ -z "$MISSING" -o $missing -gt 0 ]; then
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[ $((count++)) -gt 0 ] || echo "$title"
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[ "$QUIET" != "" -o $count -lt 20 ] || count=0
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if [ -z "$UPSTREAM" -o "$upstream" = "none" -o -z "$upstream" ]; then
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echo "$(short $ref) $line"
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else
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echo "$(short $upstream) $line"
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fi
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fi
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done < "$WORK/${REF//\//_}"
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}
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while [ -n "$1" -a -z "${1##-*}" ]; do
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case "$1" in
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-b) BASE="$2" ; shift 2 ;;
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-r) REF="$2" ; shift 2 ;;
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-l) LOGEXPR="$2" ; shift 2 ;;
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-s) SUBJECT="$2" ; shift 2 ;;
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-q) QUIET=1 ; shift ;;
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-m) MISSING=1 ; shift ;;
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-u) UPSTREAM=1 ; shift ;;
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-H) BODYHASH=1 ; shift ;;
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-h|--help) quit "$USAGE" ;;
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*) die "$USAGE" ;;
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esac
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done
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# if no ref, either we're checking missing backports and we'll guess
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# the upstream reference branch based on which one contains most of
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# the latest commits, or we'll use master.
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if [ -z "$REF" ]; then
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if [ -n "$MISSING" ]; then
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# check the last 10 commits in the base branch, and see where
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# the seem to be coming from.
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TAG="$(git describe --tags ${BASE:-HEAD} --abbrev=0)"
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LAST_COMMITS=( $(git rev-list --abbrev-commit --reverse "$TAG^^.." | tail -n10) )
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REF=$(for i in "${LAST_COMMITS[@]}"; do
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upstream=$(git log -1 --pretty --format=%B $i |
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sed -n 's/^commit \([^)]*\) upstream\.$/\1/p;s/^(cherry picked from commit \([^)]*\))/\1/p' |
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tail -n1)
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if [ -n "$upstream" ]; then
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# use local first then remote branch
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( git branch --sort=refname --contains $upstream | head -n1 ;
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git branch -r --sort=refname --contains $upstream | head -n1) 2>&1 |
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grep 'master\|maint' | head -n1
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fi
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done | sort | uniq -c | sort -nr | awk '{ print $NF; exit;}')
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# here we have a name, e.g. "2.6/master" in REF
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REF="${REF:-master}"
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err "Warning! No ref specified, using $REF."
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else
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REF=master
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fi
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fi
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# branches may also appear as id1..id2 to limit the history instead of looking
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# back to the common base. The field is left empty if not set.
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BRANCHES=( )
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BASES=( )
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while [ $# -gt 0 ]; do
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if [ "$1" = "--" ]; then
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shift
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break
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fi
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branch="${1##*..}"
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if [ "$branch" == "$1" ]; then
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base=""
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else
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base="${1%%..*}"
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fi
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BASES[${#BRANCHES[@]}]="$base"
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BRANCHES[${#BRANCHES[@]}]="$branch"
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shift
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done
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# args left for git-log
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ARGS=( "$@" )
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if [ ${#BRANCHES[@]} = 0 ]; then
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if [ -n "$MISSING" ]; then
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BRANCHES=( HEAD )
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else
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die "$USAGE"
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fi
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fi
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for branch in "$REF" "${BRANCHES[@]}"; do
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if ! git rev-parse --verify -q "$branch" >/dev/null; then
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die "Failed to check git branch $branch."
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fi
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done
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if [ -z "$BASE" -a -n "$MISSING" ]; then
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err "Warning! No base specified, checking latest backports from current branch since last tag."
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TAG="$(git describe --tags HEAD --abbrev=0)"
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COMMITS=( $(git rev-list --abbrev-commit --reverse "$TAG^^..") )
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tip=""
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for commit in "${COMMITS[@]}"; do
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parent=$(git log -1 --pretty --format=%B $commit |
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sed -n 's/^commit \([^)]*\) upstream\.$/\1/p;s/^(cherry picked from commit \([^)]*\))/\1/p' |
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tail -n1)
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if [ -z "$tip" ]; then
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tip=$parent
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elif [ -n "$parent" ]; then
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base=$(git merge-base "$tip" "$parent")
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if [ "$base" = "$tip" ]; then
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# tip is older than parent, switch tip to it if it
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# belongs to the upstream branch
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if [ "$(git merge-base $parent $REF)" = "$parent" ]; then
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tip=$parent
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fi
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fi
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fi
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done
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BASE="$tip"
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if [ -n "$BASE" ]; then
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echo "Restarting from $(git log -1 --no-decorate --oneline $BASE)"
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else
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echo "Could not figure the base."
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fi
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fi
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if [ -z "$BASE" ]; then
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err "Warning! No base specified, looking for common ancestor."
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BASE=$(git merge-base --all "$REF" "${BRANCHES[@]}")
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if [ -z "$BASE" ]; then
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die "Couldn't find a common ancestor between these branches"
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fi
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fi
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# we want to go to the git root dir
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DIR="$PWD"
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cd $(git rev-parse --show-toplevel)
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mkdir -p .git/.show-backports #|| die "Can't create .git/.show-backports"
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WORK=.git/.show-backports
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rm -f "$WORK/${REF//\//_}"
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git log --reverse ${LOGEXPR:+--grep $LOGEXPR} --pretty="%H %s" "$BASE".."$REF" -- "${ARGS[@]}" | grep "${SUBJECT}" > "$WORK/${REF//\//_}"
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# for each branch, enumerate all commits and their ancestry
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branch_num=0;
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while [ $branch_num -lt "${#BRANCHES[@]}" ]; do
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branch="${BRANCHES[$branch_num]}"
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base="${BASES[$branch_num]}"
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base="${base:-$BASE}"
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rm -f "$WORK/${branch//\//_}"
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git log --reverse --pretty="%H %s" "$base".."$branch" -- "${ARGS[@]}" | grep "${SUBJECT}" | while read h subject; do
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echo -n "$h" $(git log -1 --pretty --format=%B "$h" | \
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sed -n 's/^commit \([^)]*\) upstream\.$/\1/p;s/^(cherry picked from commit \([^)]*\))/\1/p')
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if [ -n "$BODYHASH" ]; then
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echo " H$(git log -1 --pretty="%an|%ae|%at|%B" "$h" | sed -n '/^\(Signed-off-by\|(cherry picked\)/q;p' | md5sum)"
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else
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echo
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fi
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done > "$WORK/${branch//\//_}"
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(( branch_num++ ))
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done
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count=0
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dump_commit_matrix | column -t | \
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(
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left_commits=( )
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right_commits=( )
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while read line; do
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# append the subject at the end of the line
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set -- $line
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echo -n "$line "
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if [ "${line::1}" = ":" ]; then
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echo "---- Subject ----"
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else
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# doing it this way prevents git from abusing the terminal
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echo "$(git log -1 --pretty="%s" "$1")"
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left_commits[${#left_commits[@]}]="$1"
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comm=""
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while [ -n "$1" -a "$1" != "-" -a "$1" != "|" ]; do
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comm="${1%-*}"
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shift
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done
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right_commits[${#right_commits[@]}]="$comm"
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fi
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done
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if [ -n "$MISSING" -a ${#left_commits[@]} -eq 0 ]; then
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echo "No missing commit to apply."
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elif [ -n "$MISSING" ]; then
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echo
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echo
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echo "In order to show and/or apply all leftmost commits to current branch :"
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echo " git show --pretty=format:'%C(yellow)commit %H%C(normal)%nAuthor: %an <%ae>%nDate: %aD%n%n%C(green)%C(bold)git cherry-pick -sx %h%n%n%w(0,4,4)%B%N' ${left_commits[@]}"
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echo
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echo " git cherry-pick -sx ${left_commits[@]}"
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echo
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if [ "${left_commits[*]}" != "${right_commits[*]}" ]; then
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echo "In order to show and/or apply all rightmost commits to current branch :"
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echo " git show --pretty=format:'%C(yellow)commit %H%C(normal)%nAuthor: %an <%ae>%nDate: %aD%n%n%C(green)%C(bold)git cherry-pick -sx %h%n%n%w(0,4,4)%B%N' ${right_commits[@]}"
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echo
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echo " git cherry-pick -sx ${right_commits[@]}"
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echo
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fi
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fi
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)
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