summaryrefslogtreecommitdiff
path: root/makechrootpkg.in
blob: 4d8ca42eff2551197ea1f31f175af25893305443 (plain)
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
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
#!/bin/bash
# License: GNU GPLv2
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

m4_include(lib/common.sh)
m4_include(lib/archroot.sh)

shopt -s nullglob

usage() {
	echo "Usage: ${0##*/} [options] -r <chrootdir> [--] [makepkg args]"
	echo ' Run this script in a PKGBUILD dir to build a package inside a'
	echo ' clean chroot. Arguments passed to this script after the'
	echo ' end-of-options marker (--) will be passed to makepkg.'
	echo ''
	echo ' The chroot dir consists of the following directories:'
	echo ' <chrootdir>/{root, copy} but only "root" is required'
	echo ' by default. The working copy will be created as needed'
	echo ''
	echo 'The chroot "root" directory must be created via the following'
	echo 'command:'
	echo '    mkarchroot <chrootdir>/root base-devel'
	echo ''
	echo 'This script reads {SRC,SRCPKG,PKG,LOG}DEST, MAKEFLAGS and PACKAGER'
	echo 'from makepkg.conf(5), if those variables are not part of the'
	echo 'environment.'
	echo ''
	echo "Default makepkg args: ${default_makepkg_args[*]}"
	echo ''
	echo 'Flags:'
	echo '-h         This help'
	echo '-c         Clean the chroot before building'
	echo '-d <dir>   Bind directory into build chroot as read-write'
	echo '-D <dir>   Bind directory into build chroot as read-only'
	echo '-u         Update the working copy of the chroot before building'
	echo '           This is useful for rebuilds without dirtying the pristine'
	echo '           chroot'
	echo '-r <dir>   The chroot dir to use'
	echo '-I <pkg>   Install a package into the working copy of the chroot'
	echo '-l <copy>  The directory to use as the working copy of the chroot'
	echo '           Useful for maintaining multiple copies'
	echo "           Default: $copy"
	echo '-n         Run namcap on the package'
	echo '-T         Build in a temporary directory'
	echo '-U         Run makepkg as a specified user'
	exit 1
}

# {{{ functions
# Usage: load_vars $makepkg_conf
# Globals:
#  - SRCDEST
#  - SRCPKGDEST
#  - PKGDEST
#  - LOGDEST
#  - MAKEFLAGS
#  - PACKAGER
load_vars() {
	local makepkg_conf="$1" var

	[[ -f $makepkg_conf ]] || return 1

	for var in {SRC,SRCPKG,PKG,LOG}DEST MAKEFLAGS PACKAGER; do
		[[ -z ${!var:-} ]] && eval "$(grep -a "^${var}=" "$makepkg_conf")"
	done

	return 0
}

# Usage: sync_chroot $rootdir $copydir [$copy]
sync_chroot() {
	local rootdir=$1
	local copydir=$2
	local copy=${3:-$2}

	if [[ "$rootdir" -ef "$copydir" ]]; then
		error 'Cannot sync copy with itself: %s' "$copydir"
		return 1
	fi

	# Get a read lock on the root chroot to make
	# sure we don't clone a half-updated chroot
	slock 8 "$rootdir.lock" \
		"Locking clean chroot [%s]" "$rootdir"

	stat_busy "Synchronizing chroot copy [%s] -> [%s]" "$rootdir" "$copy"
	if is_subvolume "$rootdir" && is_same_fs "$rootdir" "$(dirname -- "$copydir")" && ! mountpoint -q "$copydir"; then
		if is_subvolume "$copydir"; then
			subvolume_delete_recursive "$copydir" ||
				die "Unable to delete subvolume %s" "$copydir"
		else
			# avoid change of filesystem in case of an umount failure
			rm --recursive --force --one-file-system "$copydir" ||
				die "Unable to delete %s" "$copydir"
		fi
		btrfs subvolume snapshot "$rootdir" "$copydir" >/dev/null ||
			die "Unable to create subvolume %s" "$copydir"
	else
		mkdir -p "$copydir"
		rsync -a --delete -q -W -x "$rootdir/" "$copydir"
	fi
	stat_done

	# Drop the read lock again
	lock_close 8

	# Update mtime
	touch "$copydir"
}

# Usage: delete_chroot $copydir [$copy]
delete_chroot() {
	local copydir=$1
	local copy=${1:-$2}

	stat_busy "Removing chroot copy [%s]" "$copy"
	if is_subvolume "$copydir" && ! mountpoint -q "$copydir"; then
		subvolume_delete_recursive "$copydir" ||
			die "Unable to delete subvolume %s" "$copydir"
	else
		# avoid change of filesystem in case of an umount failure
		rm --recursive --force --one-file-system "$copydir" ||
			die "Unable to delete %s" "$copydir"
	fi

	# remove lock file
	rm -f "$copydir.lock"
	stat_done
}

# Usage: install_packages $copydir $pkgs...
install_packages() {
	local copydir=$1
	local install_pkgs=("${@:2}")

	local -a pkgnames
	local ret

	pkgnames=("${install_pkgs[@]##*/}")

	cp -- "${install_pkgs[@]}" "$copydir/root/"
	arch-nspawn "$copydir" "${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \
		pacman -U --noconfirm -- "${pkgnames[@]/#//root/}"
	ret=$?
	rm -- "${pkgnames[@]/#/$copydir/root/}"

	return $ret
}

# Usage: prepare_chroot $copydir $HOME $keepbuilddir $run_namcap
# Globals:
#  - MAKEFLAGS
#  - PACKAGER
prepare_chroot() {
	local copydir=$1
	local USER_HOME=$2
	local keepbuilddir=$3
	local run_namcap=$4

	[[ $keepbuilddir = true ]] || rm -rf "$copydir/build"

	local builduser_uid builduser_gid
	builduser_uid="${SUDO_UID:-$UID}"
	builduser_gid="$(id -g "$builduser_uid")"
	local install="install -o $builduser_uid -g $builduser_gid"
	local x

	# We can't use useradd without chrooting, otherwise it invokes PAM modules
	# which we might not be able to load (i.e. when building i686 packages on
	# an x86_64 host).
	sed -e '/^builduser:/d' -i "$copydir"/etc/{passwd,shadow,group}
	printf >>"$copydir/etc/group"  'builduser:x:%d:\n' "$builduser_gid"
	printf >>"$copydir/etc/passwd" 'builduser:x:%d:%d:builduser:/build:/bin/bash\n' "$builduser_uid" "$builduser_gid"
	printf >>"$copydir/etc/shadow" 'builduser:!!:%d::::::\n' "$(( $(date -u +%s) / 86400 ))"

	$install -d "$copydir"/{build,startdir,{pkg,srcpkg,src,log}dest}

	sed -e '/^MAKEFLAGS=/d' -e '/^PACKAGER=/d' -i "$copydir/etc/makepkg.conf"
	for x in BUILDDIR=/build PKGDEST=/pkgdest SRCPKGDEST=/srcpkgdest SRCDEST=/srcdest LOGDEST=/logdest \
		"MAKEFLAGS='${MAKEFLAGS:-}'" "PACKAGER='${PACKAGER:-}'"
	do
		grep -q "^$x" "$copydir/etc/makepkg.conf" && continue
		echo "$x" >>"$copydir/etc/makepkg.conf"
	done

	cat > "$copydir/etc/sudoers.d/builduser-pacman" <<EOF
builduser ALL = NOPASSWD: /usr/bin/pacman
EOF
	chmod 440 "$copydir/etc/sudoers.d/builduser-pacman"

	# This is a little gross, but this way the script is recreated every time in the
	# working copy
	{
		printf '#!/bin/bash\n'
		declare -f _chrootbuild
		declare -p SOURCE_DATE_EPOCH 2>/dev/null || true
		printf '_chrootbuild "$@" || exit\n'

		if [[ $run_namcap = true ]]; then
			declare -f _chrootnamcap
			printf '_chrootnamcap || exit\n'
		fi
	} >"$copydir/chrootbuild"
	chmod +x "$copydir/chrootbuild"
}

# These functions aren't run in makechrootpkg,
# so no global variables
_chrootbuild() {
	# No coredumps
	ulimit -c 0

	# shellcheck source=/dev/null
	. /etc/profile

	# otherwise we might have missing keys
	pacman-key --populate

	# Beware, there are some stupid arbitrary rules on how you can
	# use "$" in arguments to commands with "sudo -i".  ${foo} or
	# ${1} is OK, but $foo or $1 isn't.
	# https://bugzilla.sudo.ws/show_bug.cgi?id=765
	sudo --preserve-env=SOURCE_DATE_EPOCH -iu builduser bash -c 'cd /startdir; makepkg "$@"' -bash "$@"
	ret=$?
	case $ret in
		0|14)
			return 0;;
		*)
			return $ret;;
	esac
}

_chrootnamcap() {
	pacman -S --needed --noconfirm namcap
	for pkgfile in /startdir/PKGBUILD /startdir/*.pkg.tar.xz /pkgdest/*; do
		if [ ! -f "${pkgfile}" ]; then
			continue
		fi
		echo "Checking ${pkgfile##*/}"
		sudo -u builduser namcap "$pkgfile" 2>&1 | tee "/logdest/${pkgfile##*/}-namcap.log"
	done
}

# Usage: download_sources $copydir $makepkg_user
# Globals:
#  - SRCDEST
download_sources() {
	local copydir=$1
	local makepkg_user=$2

	setup_workdir
	chown "$makepkg_user:" "$WORKDIR"

	# Ensure sources are downloaded
	sudo -u "$makepkg_user" --preserve-env=GNUPGHOME \
		env SRCDEST="$SRCDEST" BUILDDIR="$WORKDIR" \
		makepkg --config="$copydir/etc/makepkg.conf" --verifysource -o ||
		die "Could not download sources."
}

# Usage: move_products $copydir $owner
# Globals:
#  - PKGDEST
#  - LOGDEST
#  - SRCPKGDEST
move_products() {
	local copydir=$1
	local src_owner=$2

	local pkgfile
	for pkgfile in "$copydir"/pkgdest/*; do
		chown "$src_owner" "$pkgfile"
		mv "$pkgfile" "$PKGDEST"

		# Fix broken symlink because of temporary chroot PKGDEST /pkgdest
		if [[ "$PWD" != "$PKGDEST" && -L "$PWD/${pkgfile##*/}" ]]; then
			ln -sf "$PKGDEST/${pkgfile##*/}"
		fi
	done

	local l
	for l in "$copydir"/logdest/*; do
		[[ $l == */logpipe.* ]] && continue
		chown "$src_owner" "$l"
		mv "$l" "$LOGDEST"
	done

	for s in "$copydir"/srcpkgdest/*; do
		chown "$src_owner" "$s"
		mv "$s" "$SRCPKGDEST"

		# Fix broken symlink because of temporary chroot SRCPKGDEST /srcpkgdest
		if [[ "$PWD" != "$SRCPKGDEST" && -L "$PWD/${s##*/}" ]]; then
			ln -sf "$SRCPKGDEST/${s##*/}"
		fi
	done
}
# }}}

main() {
	default_makepkg_args=(--syncdeps --noconfirm --log --holdver --skipinteg)
	makepkg_args=("${default_makepkg_args[@]}")
	keepbuilddir=false
	update_first=false
	clean_first=false
	run_namcap=false
	temp_chroot=false
	chrootdir=
	passeddir=
	makepkg_user=
	declare -a install_pkgs
	declare -i ret=0

	bindmounts_ro=()
	bindmounts_rw=()

	copy=$USER
	[[ -n ${SUDO_USER:-} ]] && copy=$SUDO_USER
	[[ -z "$copy" || $copy = root ]] && copy=copy
	src_owner=${SUDO_USER:-$USER}

	while getopts 'hcur:I:l:nTD:d:U:' arg; do
		case "$arg" in
			c) clean_first=true ;;
			D) bindmounts_ro+=("--bind-ro=$OPTARG") ;;
			d) bindmounts_rw+=("--bind=$OPTARG") ;;
			u) update_first=true ;;
			r) passeddir="$OPTARG" ;;
			I) install_pkgs+=("$OPTARG") ;;
			l) copy="$OPTARG" ;;
			n) run_namcap=true; makepkg_args+=(--install) ;;
			T) temp_chroot=true; copy+="-$$" ;;
			U) makepkg_user="$OPTARG" ;;
			h|*) usage ;;
		esac
	done

	[[ ! -f PKGBUILD && -z "${install_pkgs[*]}" ]] && die 'This must be run in a directory containing a PKGBUILD.'
	[[ -n $makepkg_user && -z $(id -u "$makepkg_user") ]] && die 'Invalid makepkg user.'
	makepkg_user=${makepkg_user:-${SUDO_USER:-$USER}}

	check_root SOURCE_DATE_EPOCH,GNUPGHOME,SRCDEST,SRCPKGDEST,PKGDEST,LOGDEST,MAKEFLAGS,PACKAGER

	# Canonicalize chrootdir, getting rid of trailing /
	chrootdir=$(readlink -e "$passeddir")
	[[ ! -d $chrootdir ]] && die "No chroot dir defined, or invalid path '%s'" "$passeddir"
	[[ ! -d $chrootdir/root ]] && die "Missing chroot dir root directory. Try using: mkarchroot %s/root base-devel" "$chrootdir"

	if [[ ${copy:0:1} = / ]]; then
		copydir=$copy
	else
		copydir="$chrootdir/$copy"
	fi

	# Pass all arguments after -- right to makepkg
	makepkg_args+=("${@:$OPTIND}")

	# See if -R or -e was passed to makepkg
	for arg in "${makepkg_args[@]}"; do
		case ${arg%%=*} in
			--repackage|--noextract) keepbuilddir=true; break ;;
			--repackage|--noextract) keepbuilddir=true; break ;;
			--*) ;;
			-*R*|-*e*) keepbuilddir=true; break ;;
		esac
	done

	if [[ -n $SUDO_USER ]]; then
		eval "USER_HOME=~$SUDO_USER"
	else
		USER_HOME=$HOME
	fi

	umask 0022

	load_vars "${XDG_CONFIG_HOME:-$USER_HOME/.config}/pacman/makepkg.conf" || load_vars "$USER_HOME/.makepkg.conf"
	load_vars /etc/makepkg.conf

	# Use PKGBUILD directory if these don't exist
	[[ -d $PKGDEST ]]    || PKGDEST=$PWD
	[[ -d $SRCDEST ]]    || SRCDEST=$PWD
	[[ -d $SRCPKGDEST ]] || SRCPKGDEST=$PWD
	[[ -d $LOGDEST ]]    || LOGDEST=$PWD

	# Lock the chroot we want to use. We'll keep this lock until we exit.
	lock 9 "$copydir.lock" "Locking chroot copy [%s]" "$copy"

	if [[ ! -d $copydir ]] || $clean_first; then
		sync_chroot "$chrootdir/root" "$copydir" "$copy"
	fi

	$update_first && arch-nspawn "$copydir" \
			"${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \
			pacman -Syu --noconfirm

	if [[ -n ${install_pkgs[*]:-} ]]; then
		install_packages "$copydir" "${install_pkgs[@]}"
		ret=$?
		# If there is no PKGBUILD we have done
		[[ -f PKGBUILD ]] || return $ret
	fi

	if [[ "$(id -u "$makepkg_user")" == 0 ]]; then
		error "Running makepkg as root is not allowed."
		exit 1
	fi

	download_sources "$copydir" "$makepkg_user"

	prepare_chroot "$copydir" "$USER_HOME" "$keepbuilddir" "$run_namcap"

	if arch-nspawn "$copydir" \
		--bind="$PWD:/startdir" \
		--bind="$SRCDEST:/srcdest" \
		"${bindmounts_ro[@]}" "${bindmounts_rw[@]}" \
		/chrootbuild "${makepkg_args[@]}"
	then
		move_products "$copydir" "$src_owner"
	else
		(( ret += 1 ))
	fi

	$temp_chroot && delete_chroot "$copydir" "$copy"

	if (( ret != 0 )); then
		if $temp_chroot; then
			die "Build failed"
		else
			die "Build failed, check %s/build" "$copydir"
		fi
	else
		true
	fi
}

main "$@"