1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
#=============================================================================
# Copyright 2015-2016 Kitware, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#=============================================================================
########################################################################
# Script for updating third party packages.
#
# This script should be sourced in a project-specific script which sets
# the following variables:
#
# name
# The name of the project.
# ownership
# A git author name/email for the commits.
# subtree
# The location of the thirdparty package within the main source
# tree.
# repo
# The git repository to use as upstream.
# tag
# The tag, branch or commit hash to use for upstream.
# shortlog
# Optional. Set to 'true' to get a shortlog in the commit message.
#
# Additionally, an "extract_source" function must be defined. It will be
# run within the checkout of the project on the requested tag. It should
# should place the desired tree into $extractdir/$name-reduced. This
# directory will be used as the newest commit for the project.
#
# For convenience, the function may use the "git_archive" function which
# does a standard "git archive" extraction using the (optional) "paths"
# variable to only extract a subset of the source tree.
#
# Dependencies
#
# To update third party packages from git repositories with submodule,
# you will need to install the "git-archive-all" Python package with
#
# pip install git-archive-all
#
# or install it from https://github.com/Kentzo/git-archive-all.
#
# This package installs a script named "git-archive-all" where pip
# installs executables. If you run pip under your user privileges (i.e.,
# not using "sudo"), this location may be $HOME/.local/bin. Make sure
# that directory is in your path so that git can find the
# "git-archive-all" script.
#
########################################################################
########################################################################
# Utility functions
########################################################################
git_archive () {
git archive --worktree-attributes --prefix="$name-reduced/" HEAD -- $paths | \
tar -C "$extractdir" -x
}
confirm_archive_all_exists () {
which git-archive-all || die "git requires an archive-all command. Please run 'pip install git-archive-all'"
}
git_archive_all () {
confirm_archive_all_exists
local tmptarball="temp.tar"
git archive-all --prefix="" "$tmptarball"
mkdir -p "$extractdir/$name-reduced"
tar -C "$extractdir/$name-reduced" -xf "$tmptarball" $paths
rm -f "$tmptarball"
}
disable_custom_gitattributes() {
pushd "${extractdir}/${name}-reduced"
# Git does not allow custom attributes in a subdirectory where we
# are about to merge the `.gitattributes` file, so disable them.
sed -i '/^\[attr\]/ {s/^/#/;}' .gitattributes
popd
}
die () {
echo >&2 "$@"
exit 1
}
warn () {
echo >&2 "warning: $@"
}
readonly regex_date='20[0-9][0-9]-[0-9][0-9]-[0-9][0-9]'
readonly basehash_regex="$name $regex_date ([0-9a-f]*)"
readonly toplevel_dir="$( git rev-parse --show-toplevel )"
cd "$toplevel_dir"
########################################################################
# Sanity checking
########################################################################
[ -n "$name" ] || \
die "'name' is empty"
[ -n "$ownership" ] || \
die "'ownership' is empty"
[ -n "$subtree" ] || \
die "'subtree' is empty"
[ -n "$repo" ] || \
die "'repo' is empty"
[ -n "$tag" ] || \
die "'tag' is empty"
# Check for an empty destination directory on disk. By checking on disk and
# not in the repo it allows a library to be freshly re-inialized in a single
# commit rather than first deleting the old copy in one commit and adding the
# new copy in a separate commit.
if [ ! -d "$(git rev-parse --show-toplevel)/$subtree" ]; then
readonly basehash=""
else
readonly basehash="$( git rev-list --author="$ownership" --grep="$basehash_regex" -n 1 HEAD )"
fi
readonly upstream_old_short="$( git cat-file commit "$basehash" | sed -n '/'"$basehash_regex"'/ {s/.*(//;s/)//;p;}' | egrep '^[0-9a-f]+$' )"
[ -n "$basehash" ] || \
warn "'basehash' is empty; performing initial import"
readonly do_shortlog="${shortlog-false}"
readonly workdir="$PWD/work"
readonly upstreamdir="$workdir/upstream"
readonly extractdir="$workdir/extract"
[ -d "$workdir" ] && \
die "error: workdir '$workdir' already exists"
trap "rm -rf '$workdir'" EXIT
# Get upstream
git clone --recursive "$repo" "$upstreamdir"
if [ -n "$basehash" ]; then
# Remove old worktrees
git worktree prune
# Use the existing package's history
git worktree add "$extractdir" "$basehash"
# Clear out the working tree
pushd "$extractdir"
git ls-files -z --recurse-submodules | xargs -0 rm -v
find . -type d -empty -delete
popd
else
# Create a repo to hold this package's history
mkdir -p "$extractdir"
git -C "$extractdir" init
fi
# Extract the subset of upstream we care about
pushd "$upstreamdir"
git checkout "$tag"
git submodule sync --recursive
git submodule update --recursive --init
readonly upstream_hash="$( git rev-parse HEAD )"
readonly upstream_hash_short="$( git rev-parse --short=8 "$upstream_hash" )"
readonly upstream_datetime="$( git rev-list "$upstream_hash" --format='%ci' -n 1 | grep -e "^$regex_date" )"
readonly upstream_date="$( echo "$upstream_datetime" | grep -o -e "$regex_date" )"
if $do_shortlog && [ -n "$basehash" ]; then
readonly commit_shortlog="
Upstream Shortlog
-----------------
$( git shortlog --no-merges --abbrev=8 --format='%h %s' "$upstream_old_short".."$upstream_hash" )"
else
readonly commit_shortlog=""
fi
extract_source || \
die "failed to extract source"
popd
[ -d "$extractdir/$name-reduced" ] || \
die "expected directory to extract does not exist"
readonly commit_summary="$name $upstream_date ($upstream_hash_short)"
# Commit the subset
pushd "$extractdir"
mv -v "$name-reduced/"* .
rmdir "$name-reduced/"
git add -A .
git commit -n --author="$ownership" --date="$upstream_datetime" -F - <<-EOF
$commit_summary
Code extracted from:
$repo
at commit $upstream_hash ($tag).$commit_shortlog
EOF
git branch -f "upstream-$name"
popd
# Merge the subset into this repository
if [ -n "$basehash" ]; then
git merge --log -s recursive "-Xsubtree=$subtree/" --no-commit "upstream-$name"
else
# Note: on Windows 'git merge --help' will open a browser, and the check
# will fail, so use the flag by default.
unrelated_histories_flag=""
if git --version | grep -q windows; then
unrelated_histories_flag="--allow-unrelated-histories "
elif git merge --help | grep -q -e allow-unrelated-histories; then
unrelated_histories_flag="--allow-unrelated-histories "
fi
readonly unrelated_histories_flag
git fetch "$extractdir" "+upstream-$name:upstream-$name"
git merge --log -s ours --no-commit $unrelated_histories_flag "upstream-$name"
git read-tree -u --prefix="$subtree/" "upstream-$name"
fi
git commit --no-edit
git branch -d "upstream-$name"
|
