#!/bin/sh
#
# git-subtree.sh: split/join git repositories in subdirectories of this one
#
# Copyright (C) 2009 Avery Pennarun <apenwarr@gmail.com>
#
if test -z "$GIT_EXEC_PATH" || ! test -f "$GIT_EXEC_PATH/git-sh-setup" || {
test "${PATH#"${GIT_EXEC_PATH}:"}" = "$PATH" &&
test ! "$GIT_EXEC_PATH" -ef "${PATH%%:*}" 2>/dev/null
}
then
basename=${0##*[/\\]}
echo >&2 'It looks like either your git installation or your'
echo >&2 'git-subtree installation is broken.'
echo >&2
echo >&2 "Tips:"
echo >&2 " - If \`git --exec-path\` does not print the correct path to"
echo >&2 " your git install directory, then set the GIT_EXEC_PATH"
echo >&2 " environment variable to the correct directory."
echo >&2 " - Make sure that your \`$basename\` file is either in your"
echo >&2 " PATH or in your git exec path (\`$(git --exec-path)\`)."
echo >&2 " - You should run git-subtree as \`git ${basename#git-}\`,"
echo >&2 " not as \`$basename\`." >&2
exit 126
fi
OPTS_SPEC="\
git subtree add --prefix=<prefix> <commit>
git subtree add --prefix=<prefix> <repository> <ref>
git subtree merge --prefix=<prefix> <commit>
git subtree split --prefix=<prefix> [<commit>]
git subtree pull --prefix=<prefix> <repository> <ref>
git subtree push --prefix=<prefix> <repository> <refspec>
--
h,help! show the help
q,quiet! quiet
d,debug! show debug messages
P,prefix= the name of the subdir to split out
options for 'split' (also: 'push')
annotate= add a prefix to commit message of new commits
b,branch!= create a new branch from the split subtree
ignore-joins ignore prior --rejoin commits
onto= try connecting new tree to an existing one
rejoin merge the new branch back into HEAD
options for 'add' and 'merge' (also: 'pull', 'split --rejoin', and 'push --rejoin')
squash merge subtree changes as a single commit
m,message!= use the given message as the commit message for the merge commit
"
indent=0
# Usage: say [MSG...]
say () {
if test -z "$arg_quiet"
then
printf '%s\n' "$*"
fi
}
# Usage: debug [MSG...]
debug () {
if test -n "$arg_debug"
then
printf "%$(($indent * 2))s%s\n" '' "$*" >&2
fi
}
# Usage: progress [MSG...]
progress () {
if test -z "$arg_quiet"
then
if test -z "$arg_debug"
then
# Debug mode is off.
#
# Print one progress line that we keep updating (use
# "\r" to return to the beginning of the line, rather
# than "\n" to start a new line). This only really
# works when stderr is a terminal.
printf "%s\r" "$*" >&2
else
# Debug mode is on. The `debug` function is regularly
# printing to stderr.
#
# Don't do the one-line-with-"\r" thing, because on a
# terminal the debug output would overwrite and hide the
# progress output. Add a "progress:" prefix to make the
# progress output and the debug output easy to
# distinguish. This ensures maximum readability whether
# stderr is a terminal or a file.
printf "progress: %s\n" "$*" >&2
fi
fi
}
# Usage: assert CMD...
assert () {
if ! "$@"
then
die "fatal: assertion failed: $*"
fi
}
# Usage: die_incompatible_opt OPTION COMMAND
die_incompatible_opt () {
assert test "$#" = 2
opt="$1"
arg_command="$2"
die "fatal: the '$opt' flag does not make sense with 'git subtree $arg_command'."
}
main () {
if test $# -eq 0
then
set -- -h
fi
set_args="$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
eval "$set_args"
. git-sh-setup
require_work_tree
# First figure out the command and whether we use --rejoin, so
# that we can provide more helpful validation when we do the
# "real" flag parsing.
arg_split_rejoin=
allow_split=
allow_addmerge=
while test $# -gt 0
do
opt="$1"
shift
case "$opt" in
--annotate|-b|-P|-m|--onto)
shift
;;
--rejoin)
arg_split_rejoin=1
;;
--no-rejoin)
arg_split_rejoin=
;;
--)
break
;;
esac
done
arg_command=$1
case "$arg_command" in
add|merge|pull)
allow_addmerge=1
;;
split|push)
allow_split=1
allow_addmerge=$arg_split_rejoin
;;
*)
die "fatal: unknown command '$arg_command'"
;;
esac
# Reset the arguments array for "real" flag parsing.
eval "$set_args"
# Begin "real" flag parsing.
arg_quiet=
arg_debug=
arg_prefix=
arg_split_branch=
arg_split_onto=
arg_split_ignore_joins=
arg_split_annotate=
arg_addmerge_squash=
arg_addmerge_message=
while test $# -gt 0
do
opt="$1"
shift
case "$opt" in
-q)
arg_quiet=1
;;
-d)
arg_debug=1
;;
--annotate)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_annotate="$1"
shift
;;
--no-annotate)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_annotate=
;;
-b)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_branch="$1"
shift
;;
-P)
arg_prefix="${1%/}"
shift
;;
-m)
test -n "$allow_addmerge" || die_incompatible_opt "$opt" "$arg_command"
arg_addmerge_message="$1"
shift
;;
--no-prefix)
arg_prefix=
;;
--onto)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_onto="$1"
shift
;;
--no-onto)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_onto=
;;
--rejoin)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
;;
--no-rejoin)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
;;
--ignore-joins)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_ignore_joins=1
;;
--no-ignore-joins)
test -n "$allow_split" || die_incompatible_opt "$opt" "$arg_command"
arg_split_ignore_joins=
;;
--squash)
test -n "$allow_addmerge" || die_incompatible_opt "$opt" "$arg_command"
arg_addmerge_squash=1
;;
--no-squash)
test -n "$allow_addmerge" || die_incompatible_opt "$opt" "$arg_command"
arg_addmerge_squash=
;;
--)
break
;;
*)
die "fatal: unexpected option: $opt"
;;
esac
done
shift
if test -z "$arg_prefix"
then
die "fatal: you must provide the --prefix option."
fi
case "$arg_command" in
add)
test -e "$arg_prefix" &&
die "fatal: prefix '$arg_prefix' already exists."
;;
*)
test -e "$arg_prefix" ||
die "fatal: '$arg_prefix' does not exist; use 'git subtree add'"
;;
esac
dir="$(dirname "$arg_prefix/.")"
debug "command: {$arg_command}"
debug "quiet: {$arg_quiet}"
debug "dir: {$dir}"
debug "opts: {$*}"
debug
"cmd_$arg_command" "$@"
}
# Usage: cache_setup
cache_setup () {
assert test $# = 0
cachedir="$GIT_DIR/subtree-cache/$$"
rm -rf "$cachedir" ||
die "fatal: can't delete old cachedir: $cachedir"
mkdir -p "$cachedir" ||
die "fatal: can't create new cachedir: $cachedir"
mkdir -p "$cachedir/notree" ||
die "fatal: can't create new cachedir: $cachedir/notree"
debug "Using cachedir: $cachedir" >&2
}
# Usage: cache_get [REVS...]
cache_get () {
for oldrev in "$@"
do
if test -r "$cachedir/$oldrev"
then
read newrev <"$cachedir/$oldrev"
echo $newrev
fi
done
}
# Usage: cache_miss [REVS...]
cache_miss () {
for oldrev in "$@"
do
if ! test -r "$cachedir/$oldrev"
then
echo $oldrev
fi
done
}
# Usage: check_parents [REVS...]
check_parents () {
missed=$(cache_miss "$@") || exit $?
local indent=$(($indent + 1))
for miss in $missed
do
if ! test -r "$cachedir/notree/$miss"
then
debug "incorrect order: $miss"
process_split_commit "$miss" ""
fi
done
}
# Usage: set_notree REV
set_notree () {
assert test $# = 1
echo "1" > "$cachedir/notree/$1"
}
# Usage: cache_set OLDREV NEWREV
cache_set () {
assert test $# = 2
oldrev="$1"
newrev="$2"
if test "$oldrev" != "latest_old" &&
test "$oldrev" != "latest_new" &&
test -e "$cachedir/$oldrev"
then
die "fatal: cache for $oldrev already exists!"
fi
echo "$newrev" >"$cachedir/$oldrev"
}
# Usage: rev_exists REV
rev_exists () {
assert test $# = 1
if git rev-parse "$1" >/dev/null 2>&1
then
return 0
else
return 1
fi
}
# Usage: try_remove_previous REV
#
# If a commit doesn't have a parent, this might not work. But we only want
# to remove the parent from the rev-list, and since it doesn't exist, it won't
# be there anyway, so do nothing in that case.
try_remove_previous () {
assert test $# = 1
if rev_exists "$1^"
then
echo "^$1^"
fi
}
# Usage: process_subtree_split_trailer SPLIT_HASH MAIN_HASH [REPOSITORY]
process_subtree_split_trailer () {
assert test $# = 2 -o $# = 3
b="$1"
sq="$2"
repository=""
if test "$#" = 3
then
repository="$3"
fi
fail_msg="fatal: could not rev-parse split hash $b from commit $sq"
if ! sub="$(git rev-parse --verify --quiet "$b^{commit}")"
then
# if 'repository' was given, try to fetch the 'git-subtree-split' hash
# before 'rev-parse'-ing it again, as it might be a tag that we do not have locally
if test -n "${repository}"
then
git fetch "$repository" "$b"
sub="$(git rev-parse --verify --quiet "$b^{commit}")" ||
die "$fail_msg"
else
hint1=$(printf "hint: hash might be a tag, try fetching it from the subtree repository:")
hint2=$(printf "hint: git fetch <subtree-repository> $b")
fail_msg=$(printf "$fail_msg\n$hint1\n$hint2")
die "$fail_msg"
fi
fi
}
# Usage: find_latest_squash DIR [REPOSITORY]
find_latest_squash () {
assert test $# = 1 -o $# = 2
dir="$1"
repository=""
if test "$#" = 2
then
repository="$2"
fi
debug "Looking for latest squash (dir=$dir, repository=$repository)..."
local indent=$(($indent + 1))
sq=
main=
sub=
git log --grep="^git-subtree-dir: $dir/*\$" \
--no-show-signature --pretty=format:'START %H%n%s%n%n%b%nEND%n' HEAD |
while read a b junk
do
debug "$a $b $junk"
debug "{{$sq/$main/$sub}}"
case "$a" in
START)
sq="$b"
;;
git-subtree-mainline:)
main="$b"
;;
git-subtree-split:)
process_subtree_split_trailer "$b" "$sq" "$repository"
;;
END)
if test -n "$sub"
then
if test -n "$main"
then
# a rejoin commit?
# Pretend its sub was a squash.
sq=$(git rev-parse --verify "$sq^2") ||
die
fi
debug "Squash found: $sq $sub"
echo "$sq" "$sub"
break
fi
sq=
main=
sub=
;;
esac
done || exit $?
}
# Usage: find_existing_splits DIR REV [REPOSITORY]
find_existing_splits () {
assert test $# = 2 -o $# = 3
debug "Looking for prior splits..."
local indent=$(($indent + 1))
dir="$1"
rev="$2"
repository=""
if test "$#" = 3
then
repository="$3"
fi
main=
sub=
local grep_format="^git-subtree-dir: $dir/*\$"
if test -n "$arg_split_ignore_joins"
then
grep_format="^Add '$dir/' from commit '"
fi
git log --grep="$grep_format" \
--no-show-signature --pretty=format:'START %H%n%s%n%n%b%nEND%n' "$rev" |
while read a b junk
do
case "$a" in
START)
sq="$b"
;;
git-subtree-mainline:)
main="$b"
;;
git-subtree-split:)
process_subtree_split_trailer "$b" "$sq" "$repository"
;;
END)
debug "Main is: '$main'"
if test -z "$main" -a -n "$sub"
then
# squash commits refer to a subtree
debug " Squash: $sq from $sub"
cache_set "$sq" "$sub"
fi
if test -n "$main" -a -n "$sub"
then
debug " Prior: $main -> $sub"
cache_set $main $sub
cache_set $sub $sub
try_remove_previous "$main"
try_remove_previous "$sub"
fi
main=
sub=
;;
esac
done || exit $?
}
# Usage: copy_commit REV TREE FLAGS_STR
copy_commit () {
assert test $# = 3
# We're going to set some environment vars here, so
# do it in a subshell to get rid of them safely later
debug copy_commit "{$1}" "{$2}" "{$3}"
git log -1 --no-show-signature --pretty=format:'%an%n%ae%n%aD%n%cn%n%ce%n%cD%n%B' "$1" |
(
read GIT_AUTHOR_NAME
read GIT_AUTHOR_EMAIL
read GIT_AUTHOR_DATE
read GIT_COMMITTER_NAME
read GIT_COMMITTER_EMAIL
read GIT_COMMITTER_DATE
export GIT_AUTHOR_NAME \
GIT_AUTHOR_EMAIL \
GIT_AUTHOR_DATE \
GIT_COMMITTER_NAME \
GIT_COMMITTER_EMAIL \
GIT_COMMITTER_DATE
(
printf "%s" "$arg_split_annotate"
cat
) |
git commit-tree "$2" $3 # reads the rest of stdin
) || die "fatal: can't copy commit $1"
}
# Usage: add_msg DIR LATEST_OLD LATEST_NEW
add_msg () {
assert test $# = 3
dir="$1"
latest_old="$2"
latest_new="$3"
if test -n "$arg_addmerge_message"
then
commit_message="$arg_addmerge_message"
else
commit_message="Add '$dir/' from commit '$latest_new'"
fi
if test -n "$arg_split_rejoin"
then
# If this is from a --rejoin, then rejoin_msg has
# already inserted the `git-subtree-xxx:` tags
echo "$commit_message"
return
fi
cat <<-EOF
$commit_message
git-subtree-dir: $dir
git-subtree-mainline: $latest_old
git-subtree-split: $latest_new
EOF
}
# Usage: add_squashed_msg REV DIR
add_squashed_msg () {
assert test $# = 2
if test -n "$arg_addmerge_message"
then
echo "$arg_addmerge_message"
else
echo "Merge commit '$1' as '$2'"
fi
}
# Usage: rejoin_msg DIR LATEST_OLD LATEST_NEW
rejoin_msg () {
assert test $# = 3
dir="$1"
latest_old="$2"
latest_new="$3"
if test -n "$arg_addmerge_message"
then
commit_message="$arg_addmerge_message"
else
commit_message="Split '$dir/' into commit '$latest_new'"
fi
cat <<-EOF
$commit_message
git-subtree-dir: $dir
git-subtree-mainline: $latest_old
git-subtree-split: $latest_new
EOF
}
# Usage: squash_msg DIR OLD_SUBTREE_COMMIT NEW_SUBTREE_COMMIT
squash_msg () {
assert test $# = 3
dir="$1"
oldsub="$2"
newsub="$3"
newsub_short=$(git rev-parse --short "$newsub")
if test -n "$oldsub"
then
oldsub_short=$(git rev-parse --short "$oldsub")
echo "Squashed '$dir/' changes from $oldsub_short..$newsub_short"
echo
git log --no-show-signature --pretty=tformat:'%h %s' "$oldsub..$newsub"
git log --no-show-signature --pretty=tformat:'REVERT: %h %s' "$newsub..$oldsub"
else
echo "Squashed '$dir/' content from commit $newsub_short"
fi
echo
echo "git-subtree-dir: $dir"
echo "git-subtree-split: $newsub"
}
# Usage: toptree_for_commit COMMIT
toptree_for_commit () {
assert test $# = 1
commit="$1"
git rev-parse --verify "$commit^{tree}" || exit $?
}
# Usage: subtree_for_commit COMMIT DIR
subtree_for_commit () {
assert test $# = 2
commit="$1"
dir="$2"
git ls-tree "$commit" -- "$dir" |
while read mode type tree name
do
assert test "$name" = "$dir"
assert test "$type" = "tree" -o "$type" = "commit"
test "$type" = "commit" && continue # ignore submodules
echo $tree
break
done || exit $?
}
# Usage: tree_changed TREE [PARENTS...]
tree_changed () {
assert test $# -gt 0
tree=$1
shift
if test $# -ne 1
then
return 0 # weird parents, consider it changed
else
ptree=$(toptree_for_commit $1) || exit $?
if test "$ptree" != "$tree"
then
return 0 # changed
else
return 1 # not changed
fi
fi
}
# Usage: new_squash_commit OLD_SQUASHED_COMMIT OLD_NONSQUASHED_COMMIT NEW_NONSQUASHED_COMMIT
new_squash_commit () {
assert test $# = 3
old="$1"
oldsub="$2"
newsub="$3"
tree=$(toptree_for_commit $newsub) || exit $?
if test -n "$old"
then
squash_msg "$dir" "$oldsub" "$newsub" |
git commit-tree "$tree" -p "$old" || exit $?
else
squash_msg "$dir" "" "$newsub" |
git commit-tree "$tree" || exit $?
fi
}
# Usage: copy_or_skip REV TREE NEWPARENTS
copy_or_skip () {
assert test $# = 3
rev="$1"
tree="$2"
newparents="$3"
assert test -n "$tree"
identical=
nonidentical=
p=
gotparents=
copycommit=
for parent in $newparents
do
ptree=$(toptree_for_commit $parent) || exit $?
test -z "$ptree" && continue
if test "$ptree" = "$tree"
then
# an identical parent could be used in place of this rev.
if test -n "$identical"
then
# if a previous identical parent was found, check whether
# one is already an ancestor of the other
mergebase=$(git merge-base $identical $parent)
if test "$identical" = "$mergebase"
then
# current identical commit is an ancestor of parent
identical="$parent"
elif test "$parent" != "$mergebase"
then
# no common history; commit must be copied
copycommit=1
fi
else
# first identical parent detected
identical="$parent"
fi
else
nonidentical="$parent"
fi
# sometimes both old parents map to the same newparent;
# eliminate duplicates
is_new=1
for gp in $gotparents
do
if test "$gp" = "$parent"
then
is_new=
break
fi
done
if test -n "$is_new"
then
gotparents="$gotparents $parent"
p="$p -p $parent"
fi
done
if test -n "$identical" && test -n "$nonidentical"
then
extras=$(git rev-list --count $identical..$nonidentical)
if test "$extras" -ne 0
then
# we need to preserve history along the other branch
copycommit=1
fi
fi
if test -n "$identical" && test -z "$copycommit"
then
echo $identical
else
copy_commit "$rev" "$tree" "$p" || exit $?
fi
}
# Usage: ensure_clean
ensure_clean () {
assert test $# = 0
if ! git diff-index HEAD --exit-code --quiet 2>&1
then
die "fatal: working tree has modifications. Cannot add."
fi
if ! git diff-index --cached HEAD --exit-code --quiet 2>&1
then
die "fatal: index has modifications. Cannot add."
fi
}
# Usage: ensure_valid_ref_format REF
ensure_valid_ref_format () {
assert test $# = 1
git check-ref-format "refs/heads/$1" ||
die "fatal: '$1' does not look like a ref"
}
# Usage: process_split_commit REV PARENTS
process_split_commit () {
assert test $# = 2
local rev="$1"
local parents="$2"
if test $indent -eq 0
then
revcount=$(($revcount + 1))
else
# processing commit without normal parent information;
# fetch from repo
parents=$(git rev-parse "$rev^@")
extracount=$(($extracount + 1))
fi
progress "$revcount/$revmax ($createcount) [$extracount]"
debug "Processing commit: $rev"
local indent=$(($indent + 1))
exists=$(cache_get "$rev") || exit $?
if test -n "$exists"
then
debug "prior: $exists"
return
fi
createcount=$(($createcount + 1))
debug "parents: $parents"
check_parents $parents
newparents=$(cache_get $parents) || exit $?
debug "newparents: $newparents"
tree=$(subtree_for_commit "$rev" "$dir") || exit $?
debug "tree is: $tree"
# ugly. is there no better way to tell if this is a subtree
# vs. a mainline commit? Does it matter?
if test -z "$tree"
then
set_notree "$rev"
if test -n "$newparents"
then
cache_set "$rev" "$rev"
fi
return
fi
newrev=$(copy_or_skip "$rev" "$tree" "$newparents") || exit $?
debug "newrev is: $newrev"
cache_set "$rev" "$newrev"
cache_set latest_new "$newrev"
cache_set latest_old "$rev"
}
# Usage: cmd_add REV
# Or: cmd_add REPOSITORY REF
cmd_add () {
ensure_clean
if test $# -eq 1
then
git rev-parse -q --verify "$1^{commit}" >/dev/null ||
die "fatal: '$1' does not refer to a commit"
cmd_add_commit "$@"
elif test $# -eq 2
then
# Technically we could accept a refspec here but we're
# just going to turn around and add FETCH_HEAD under the
# specified directory. Allowing a refspec might be
# misleading because we won't do anything with any other
# branches fetched via the refspec.
ensure_valid_ref_format "$2"
cmd_add_repository "$@"
else
say >&2 "fatal: parameters were '$*'"
die "Provide either a commit or a repository and commit."
fi
}
# Usage: cmd_add_repository REPOSITORY REFSPEC
cmd_add_repository () {
assert test $# = 2
echo "git fetch" "$@"
repository=$1
refspec=$2
git fetch "$@" || exit $?
cmd_add_commit FETCH_HEAD
}
# Usage: cmd_add_commit REV
cmd_add_commit () {
# The rev has already been validated by cmd_add(), we just
# need to normalize it.
assert test $# = 1
rev=$(git rev-parse --verify "$1^{commit}") || exit $?
debug "Adding $dir as '$rev'..."
if test -z "$arg_split_rejoin"
then
# Only bother doing this if this is a genuine 'add',
# not a synthetic 'add' from '--rejoin'.
git read-tree --prefix="$dir" $rev || exit $?
fi
git checkout -- "$dir" || exit $?
tree=$(git write-tree) || exit $?
headrev=$(git rev-parse --verify HEAD) || exit $?
if test -n "$headrev" && test "$headrev" != "$rev"
then
headp="-p $headrev"
else
headp=
fi
if test -n "$arg_addmerge_squash"
then
rev=$(new_squash_commit "" "" "$rev") || exit $?
commit=$(add_squashed_msg "$rev" "$dir" |
git commit-tree "$tree" $headp -p "$rev") || exit $?
else
revp=$(peel_committish "$rev") || exit $?
commit=$(add_msg "$dir" $headrev "$rev" |
git commit-tree "$tree" $headp -p "$revp") || exit $?
fi
git reset "$commit" || exit $?
say >&2 "Added dir '$dir'"
}
# Usage: cmd_split [REV] [REPOSITORY]
cmd_split () {
if test $# -eq 0
then
rev=$(git rev-parse HEAD)
elif test $# -eq 1 -o $# -eq 2
then
rev=$(git rev-parse -q --verify "$1^{commit}") ||
die "fatal: '$1' does not refer to a commit"
else
die "fatal: you must provide exactly one revision, and optionnally a repository. Got: '$*'"
fi
repository=""
if test "$#" = 2
then
repository="$2"
fi
if test -n "$arg_split_rejoin"
then
ensure_clean
fi
debug "Splitting $dir..."
cache_setup || exit $?
if test -n "$arg_split_onto"
then
debug "Reading history for --onto=$arg_split_onto..."
git rev-list $arg_split_onto |
while read rev
do
# the 'onto' history is already just the subdir, so
# any parent we find there can be used verbatim
debug "cache: $rev"
cache_set "$rev" "$rev"
done || exit $?
fi
unrevs="$(find_existing_splits "$dir" "$rev" "$repository")" || exit $?
# We can't restrict rev-list to only $dir here, because some of our
# parents have the $dir contents the root, and those won't match.
# (and rev-list --follow doesn't seem to solve this)
grl='git rev-list --topo-order --reverse --parents $rev $unrevs'
revmax=$(eval "$grl" | wc -l)
revcount=0
createcount=0
extracount=0
eval "$grl" |
while read rev parents
do
process_split_commit "$rev" "$parents"
done || exit $?
latest_new=$(cache_get latest_new) || exit $?
if test -z "$latest_new"
then
die "fatal: no new revisions were found"
fi
if test -n "$arg_split_rejoin"
then
debug "Merging split branch into HEAD..."
latest_old=$(cache_get latest_old) || exit $?
arg_addmerge_message="$(rejoin_msg "$dir" "$latest_old" "$latest_new")" || exit $?
if test -z "$(find_latest_squash "$dir")"
then
cmd_add "$latest_new" >&2 || exit $?
else
cmd_merge "$latest_new" >&2 || exit $?
fi
fi
if test -n "$arg_split_branch"
then
if rev_exists "refs/heads/$arg_split_branch"
then
if ! git merge-base --is-ancestor "$arg_split_branch" "$latest_new"
then
die "fatal: branch '$arg_split_branch' is not an ancestor of commit '$latest_new'."
fi
action='Updated'
else
action='Created'
fi
git update-ref -m 'subtree split' \
"refs/heads/$arg_split_branch" "$latest_new" || exit $?
say >&2 "$action branch '$arg_split_branch'"
fi
echo "$latest_new"
exit 0
}
# Usage: cmd_merge REV [REPOSITORY]
cmd_merge () {
test $# -eq 1 -o $# -eq 2 ||
die "fatal: you must provide exactly one revision, and optionally a repository. Got: '$*'"
rev=$(git rev-parse -q --verify "$1^{commit}") ||
die "fatal: '$1' does not refer to a commit"
repository=""
if test "$#" = 2
then
repository="$2"
fi
ensure_clean
if test -n "$arg_addmerge_squash"
then
first_split="$(find_latest_squash "$dir" "$repository")" || exit $?
if test -z "$first_split"
then
die "fatal: can't squash-merge: '$dir' was never added."
fi
set $first_split
old=$1
sub=$2
if test "$sub" = "$rev"
then
say >&2 "Subtree is already at commit $rev."
exit 0
fi
new=$(new_squash_commit "$old" "$sub" "$rev") || exit $?
debug "New squash commit: $new"
rev="$new"
fi
if test -n "$arg_addmerge_message"
then
git merge --no-ff -Xsubtree="$arg_prefix" \
--message="$arg_addmerge_message" "$rev"
else
git merge --no-ff -Xsubtree="$arg_prefix" $rev
fi
}
# Usage: cmd_pull REPOSITORY REMOTEREF
cmd_pull () {
if test $# -ne 2
then
die "fatal: you must provide <repository> <ref>"
fi
repository="$1"
ref="$2"
ensure_clean
ensure_valid_ref_format "$ref"
git fetch "$repository" "$ref" || exit $?
cmd_merge FETCH_HEAD "$repository"
}
# Usage: cmd_push REPOSITORY [+][LOCALREV:]REMOTEREF
cmd_push () {
if test $# -ne 2
then
die "fatal: you must provide <repository> <refspec>"
fi
if test -e "$dir"
then
repository=$1
refspec=${2#+}
remoteref=${refspec#*:}
if test "$remoteref" = "$refspec"
then
localrevname_presplit=HEAD
else
localrevname_presplit=${refspec%%:*}
fi
ensure_valid_ref_format "$remoteref"
localrev_presplit=$(git rev-parse -q --verify "$localrevname_presplit^{commit}") ||
die "fatal: '$localrevname_presplit' does not refer to a commit"
echo "git push using: " "$repository" "$refspec"
localrev=$(cmd_split "$localrev_presplit" "$repository") || die
git push "$repository" "$localrev":"refs/heads/$remoteref"
else
die "fatal: '$dir' must already exist. Try 'git subtree add'."
fi
}
main "$@"
Mini Shell