driver=quilt;;
--collapse)
driver=collapse;;
+ --linearize)
+ driver=linearize;;
-*)
- echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY)" >&2
+ echo "Usage: tg [...] export ([--collapse] NEWBRANCH | [-b BRANCH1,BRANCH2...] --quilt DIRECTORY | --linearize NEWBRANCH)" >&2
exit 1;;
*)
[ -z "$output" ] || die "output already specified ($output)"
name="$(git symbolic-ref HEAD | sed 's#^refs/heads/##')"
base_rev="$(git rev-parse --short --verify "refs/top-bases/$name" 2>/dev/null)" ||
die "not on a TopGit-controlled branch"
+ branches="$name"
+else
+ name="${branches##*,}" # the last of the comma-separated items
fi
+# $name holds the current branch
+# $branches holds the comma-separated list of branches
+# $name is equal to the last of the list of branches
-playground="$(mktemp -d -t tg-export.XXXXXX)"
-trap 'rm -rf "$playground"' EXIT
+playground="$(get_temp tg-export -d)"
## Collapse driver
-# pretty_tree NAME
-# Output tree ID of a cleaned-up tree without tg's artifacts.
-pretty_tree()
-{
- (export GIT_INDEX_FILE="$playground/^index"
- git read-tree "$1"
- git update-index --force-remove ".topmsg" ".topdeps"
- git write-tree)
-}
-
-# collapsed_commit NAME
-# Produce a collapsed commit of branch NAME.
-collapsed_commit()
+create_tg_commit()
{
name="$1"
-
- rm -f "$playground/^pre" "$playground/^post"
- >"$playground/^body"
+ tree="$2"
+ parent="$3"
# Get commit message and authorship information
git cat-file blob "$name:.topmsg" | git mailinfo "$playground/^msg" /dev/null > "$playground/^info"
test -n "$GIT_AUTHOR_EMAIL" && export GIT_AUTHOR_EMAIL
test -n "$GIT_AUTHOR_DATE" && export GIT_AUTHOR_DATE
+ (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
+ git stripspace |
+ git commit-tree "$tree" -p "$parent"
+}
+
+# collapsed_commit NAME
+# Produce a collapsed commit of branch NAME.
+collapsed_commit()
+{
+ local name; name="$1"
+
+ rm -f "$playground/^pre" "$playground/^post"
+ >"$playground/^body"
+
# Determine parent
parent="$(cut -f 1 "$playground/$name^parents")"
if [ "$(cat "$playground/$name^parents" | wc -l)" -gt 1 ]; then
echo "TopGit-driven merge of branches:"
echo
cut -f 2 "$playground/$name^parents"
- } | git commit-tree "$(pretty_tree "refs/top-bases/$name")" \
+ } | git commit-tree "$(pretty_tree "$name" -b)" \
$(for p in $parent; do echo -p $p; done))"
fi
if branch_empty "$name"; then
echo "$parent";
else
- (printf '%s\n\n' "$SUBJECT"; cat "$playground/^msg") |
- git stripspace |
- git commit-tree "$(pretty_tree "$name")" -p "$parent"
+ create_tg_commit "$name" "$(pretty_tree $name)" "$parent"
fi;
echo "$name" >>"$playground/^ticker"
echo "Skip empty patch $_dep";
else
if "$numbered"; then
- number="$(printf "%04u" $(($(cat "$playground/^number" 2>/dev/null) + 1)))";
- bn="$number-$bn";
+ number="$(echo $(($(cat "$playground/^number" 2>/dev/null) + 1)))";
+ bn="$(printf "%04u-$bn" $number)";
echo "$number" >"$playground/^number";
fi;
fi
}
+linearize()
+{
+ if test ! -f "$playground/^BASE"; then
+ head="$(git rev-parse --verify "$_dep")"
+ echo "$head" > "$playground/^BASE"
+ git checkout -q "$head"
+ return;
+ fi;
+
+ head=$(git rev-parse --verify HEAD)
+
+ if [ -z "$_dep_is_tgish" ]; then
+ # merge in $_dep unless already included
+ rev="$(git rev-parse --verify "$_dep")";
+ common="$(git merge-base --all HEAD "$_dep")";
+ if test "$rev" = "$common"; then
+ # already included, just skip
+ :;
+ else
+ retmerge=0;
+
+ git merge -s recursive "$_dep" || retmerge="$?";
+ if test "x$retmerge" != "x0"; then
+ echo fix up the merge, commit and then exit;
+ #todo error handling
+ sh -i </dev/tty;
+ fi;
+ fi;
+ else
+ retmerge=0;
+
+ git merge-recursive "$(pretty_tree "$_dep" -b)" -- HEAD "$(pretty_tree "refs/heads/$_dep")" || retmerge="$?";
+
+ if test "x$retmerge" != "x0"; then
+ git rerere;
+ echo "fix up the merge and update the index. Don't commit!"
+ #todo error handling
+ sh -i </dev/tty;
+ fi
+
+ result_tree=$(git write-tree)
+ # testing branch_empty might not always give the right answer.
+ # It can happen that the patch is non-empty but still after
+ # linearizing there is no change. So compare the trees.
+ if test "x$result_tree" = "x$(git rev-parse $head^{tree})"; then
+ echo "skip empty commit $_dep";
+ else
+ newcommit=$(create_tg_commit "$_dep" "$result_tree" HEAD)
+ git update-ref HEAD $newcommit $head
+ echo "exported commit $_dep";
+ fi
+ fi
+}
## Machinery
-if [ "$driver" = "collapse" ]; then
+if [ "$driver" = "collapse" ] || [ "$driver" = "linearize" ]; then
[ -n "$output" ] ||
die "no target branch specified"
! ref_exists "$output" ||
# Call driver on all the branches - this will happen
# in topological order.
-if [ -z "$branches" ]; then
+echo "$branches" | tr , '\n' | while read name; do
recurse_deps driver "$name"
(_ret=0; _dep="$name"; _name=""; _dep_is_tgish=1; driver)
-else
- echo "$branches" | tr ',' '\n' | while read _dep; do
- _dep_is_tgish=1
- $driver
- done
- name="$(echo "$branches" | sed 's/.*,//')"
-fi
-
+done
if [ "$driver" = "collapse" ]; then
git update-ref "refs/heads/$output" "$(cat "$playground/$name")" ""
elif [ "$driver" = "quilt" ]; then
depcount="$(cat "$output/series" | wc -l)"
echo "Exported topic branch $name (total $depcount topics) to directory $output"
+
+elif [ "$driver" = "linearize" ]; then
+ git checkout -q -b $output
+
+ echo $name
+ if test $(git rev-parse "$(pretty_tree $name)^{tree}") != $(git rev-parse "HEAD^{tree}"); then
+ echo "Warning: Exported result doesn't match";
+ echo "tg-head=$(git rev-parse "$name"), exported=$(git rev-parse "HEAD")";
+ #git diff $head HEAD;
+ fi;
+
fi
# vim:noet
~ian / topgit.git / blobdiff