261 lines
7.6 KiB
Bash
Executable File
261 lines
7.6 KiB
Bash
Executable File
#!/bin/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: ${0##*/} [-q] [-H] [-m] [-u] [-r reference] [-l logexpr] [-s subject] [-b base] {branch|range} [...]"
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BASES=( )
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BRANCHES=( )
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REF=master
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BASE=
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QUIET=
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LOGEXPR=
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SUBJECT=
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MISSING=
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UPSTREAM=
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BODYHASH=
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die() {
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[ "$#" -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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# 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 [ $# -gt 0 ]; do
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branch="${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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if [ ${#BRANCHES[@]} = 0 ]; then
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die "$USAGE"
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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" ]; 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".."$REF" | grep "${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" | 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 "In order to show and/or apply all leftmost commits to current branch :"
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echo " git show ${left_commits[@]}"
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echo " git cherry-pick -sx ${left_commits[@]}"
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echo
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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 ${right_commits[@]}"
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echo " git cherry-pick -sx ${right_commits[@]}"
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fi
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)
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