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export add --rebase driver allowing to rebase topic branches from one… #20

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export add --rebase driver allowing to rebase topic branches from one…
MarcWeber Sep 26, 2021
dba55b6
export --rebase: better documentation, allow rebasing from not tg bra…
MarcWeber Dec 1, 2022
3aeaa91
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MarcWeber Dec 1, 2022
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52 changes: 52 additions & 0 deletions t/9000-rebase.sh
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Original file line number Diff line number Diff line change
@@ -0,0 +1,52 @@
#!/bin/sh

test_description='tg create tests'

TEST_NO_CREATE_REPO=1

. ./test-lib.sh

test_plan 1

test_recreate_repo_cd() {
! [ -e "$1" ] || rm -rf "$1"
! [ -e "$1" ] || { chmod -R u+rw "$1"; rm -rf "$1"; }
! [ -e "$1" ] || die
test_create_repo "$1" &&
cd "$1"
}

test_expect_success 'tg rebase' '
echo "See comments below this test fails"
'

# This test fails :-(
# test_commit(){ echo $1 > $1; git add $1; git commit -m $1; }
# Then you can run the lines below without && in a simple shell after git init
# to see the last tg export --rebase command fails (but it got the job done).
# The rebased merge branch gets created.
# I don't have time to debug it right now

# test_expect_success 'tg rebase' '
# test_recreate_repo_cd r0 &&
# test_commit release-1 &&
# echo "tag this as release-1, then create blue and red branches and merge them as topic branch" &&
# git checkout -b release-1 &&
# tg create --topmsg release-1:blue release-1-topics/blue release-1 &&
# test_commit blue &&
# git checkout release-1 &&
# tg create --topmsg release-1:red release-1-topics/red release-1 &&
# test_commit red &&
# tg create --topmsg release-1:merge_blue_and_red release-1-topics/merge release-1-topics/blue release-1-topics/red &&
# echo "now advavce release-1 to release-2 and call that so" &&
# git checkout release-1 &&
# git checkout -b release-2 &&
# test_commit release-2 &&
# tg export --rebase --from-to release-1 release-2 --drop-prefix release-1-topics/ --prefix release-2-topics/ release-1-topics/merge &&
# echo "because blue red shoud be rebase don release-2 we should have all 3 files" &&
# [ -e blue ] &&
# [ -e red ] &&
# [ -e release-2 ]
# '

test_done
127 changes: 126 additions & 1 deletion tg-export.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,26 @@ Usage: ${tgname:-tg} [...] export [--collapse] [--force] [<option>...] <newbranc
Or: ${tgname:-tg} [...] export --linearize [--force] [<option>...] <newbranch>
Or: ${tgname:-tg} [...] export --quilt [--force] [-a | --all | -b <branch>...]
[--binary] [--flatten] [--numbered] [--strip[=N]] <directory>
Or: ${tgname:-tg} [...] export --rebase --from-to <old_base> <new_base>
[--prefix <prefix>] [--drop-prefix <prefix>] -b <branch> -b <branch>
rebase topgit branches from old_base to new_base.
This is useful if you need to maintain topgit
branches on multiple releases of a project
Example:
2) Assuming the old base is release-1.0 the new base will be release-1.1
the old topic branches have been prefixed by release-1.0-topgit-patches/
and new topic branches should be prefixed by release-1.1-topgit-patches/
start the rebase with

tg export --from-to release-1.0 release-1.1 \
--drop-prefix release-1.0-topgit-patches/ \
--prefix release-1.1-topgit-patches/ \
release-1.0-topgit-patches/topic-summing-up-other-topics

Looks like there is still a problem with the
final tg create. Just exit shell/ignore and
run tg update yourself to see it worked (?)

Options:
-s <mode> set subject bracketed [strings] strip mode
--notes[=<ref>] export .topmsg --- comment to notes ref <ref>
Expand Down Expand Up @@ -97,6 +117,19 @@ while [ -n "$1" ]; do
-s)
test $# -gt 0 && test -n "$1" || die "-s requires an argument"
smode="$1"; shift;;

--rebase)
driver=rebase;;
--from)
REBASE_FROM="$1"; shift;;
--from-to)
declare -A REBASE_FROM_TO
REBASE_FROM_TO["$1"]="$2"
shift 2;;
--drop-prefix)
REBASE_DROP_PREFIX="$1"; shift;;
--prefix)
REBASE_PREFIX="$1"; shift;;
--quilt)
driver=quilt;;
--collapse)
Expand Down Expand Up @@ -149,6 +182,16 @@ if [ "$driver" != "quilt" ]; then
fi
fi

if [ "$driver" == "rebase" ]; then
name=$output
output=
echo "!! You've chosen the experimental rebase feature. the tg export --rebase command fails with non zero exit code check the result. It might have worked :-/"
else
if [ -n "$REBASE_FROM_TO" -o -n "$REBASE_DROP_PREFIX" -o -n "$REBASE_PREFIX" ]; then
die "--onto and --drop-prefix can only be used in --rebase mode"
fi
fi

[ -z "$branches" ] || [ "$driver" = "quilt" ] ||
die "-b works only with the quilt driver"

Expand Down Expand Up @@ -179,7 +222,7 @@ if [ "$driver" = "linearize" ]; then
fi
fi

if [ -z "$branches" ] && [ -z "$allbranches" ]; then
if [ -z "$branches" ] && [ -z "$allbranches" ] && [ "$driver" != "rebase" ]; then
# this check is only needed when no branches have been passed
v_verify_topgit_branch name HEAD
fi
Expand Down Expand Up @@ -382,6 +425,88 @@ collapse()
}


## REBASE driver

rebase()
{


if [ -s "$playground/$_dep^commit" ]; then
# We've already seen this dep
commit="$(cat "$playground/$_dep^commit")"

elif [ -z "$_dep_is_tgish" ]; then
# This dep is not for rewrite
commit="$(git rev-parse --verify "refs/heads/$_dep^0" --)"

else
# First time hitting this dep; the common case

test -d "$playground/${_dep%/*}" || mkdir -p "$playground/${_dep%/*}"
commit="$(collapsed_commit "$_dep")"
bump_timestamp
echol "$commit" >"$playground/$_dep^commit"

cp .git/HEAD $playground/HEAD-tmp
new_branch_name="${REBASE_PREFIX}${_dep##$REBASE_DROP_PREFIX}"

REBASE_FROM_TO[$_dep]="${new_branch_name}"

if git rev-parse --abbrev-ref "$new_branch_name" -- &> /dev/null; then
echo "---"
echo "branch $new_branch_name already exists"; return;
else
echo "---"
echo "trying to rebase $_dep new name $new_branch_name"
echo "head is $(cat .git/HEAD)"
fi

declare -a target_deps
target_deps=()

echo git show $_dep:.topdeps
echo $(git show $_dep:.topdeps)
while read dep; do
if [ -z "$dep" ]; then continue; fi
n="${REBASE_FROM_TO[$dep]}"
echo "found dep $dep, n $n"
if [ -n "$n" ]; then
echo "adding dep $n"
target_deps=("${target_deps[@]}" "$n")
else
die "$_dep has bad .topdep line $dep which has no target branch yet !? BUG"
fi
done <<-EOF
$(git show $_dep:.topdeps)
EOF


git show "$_dep":.topmsg > $playground/.topmsg
echo "creating topgit branch $new_branch_name with deps ${target_deps[@]}"
git checkout "${target_deps[0]}" || die 'checking out failed'
# sourcing tg-create doesn't work cause it calls exit
"$TG_INST_CMDDIR"/../../bin/tg create --topmsg-file $playground/.topmsg -m "new tg branch $new_branch_name" "${new_branch_name}" "${target_deps[@]}" || {
echo 'tg create failed';
"${SHELL:-@SHELL_PATH@}" -i </dev/tty || { echo "user abort"; return ; }
}
# git add .topmsg .topdeps
# git commit -m "$new_branch_name dotfiles"

git cherry-pick $commit || {
echo "cherry-picking the commit failed, please fix and commit and exit shell. use status !=0 to abort rebase"
"${SHELL:-@SHELL_PATH@}" -i </dev/tty || { echo "user abort"; return ; }
}

echo "head is $(cat .git/HEAD)"


fi

# Propagate our work through the dependency chain
test -d "$playground/${_name%/*}" || mkdir -p "$playground/${_name%/*}"
echo "$commit $_dep" >>"$playground/$_name^parents"
}

## Quilt driver

quilt()
Expand Down