summaryrefslogtreecommitdiffstats
path: root/db-functions
blob: 2949578cd63dd0c2aa6122536254e63f8241add6 (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
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
#!/bin/bash

# Some PKGBUILDs need CARCH to be set
CARCH="x86_64"

# Useful functions
UMASK=""
set_umask () {
	[ "$UMASK" == "" ] && UMASK="$(umask)"
	export UMASK
	umask 002
}

restore_umask () {
	umask $UMASK >/dev/null
}

# just like mv -f, but we touch the file and then copy the content so
# default ACLs in the target dir will be applied
mv_acl() {
	rm -f "$2"
	touch "$2"
	cat "$1" >"$2" || return 1
	rm -f "$1"
}

if [[ $USER != $DBSCRIPTS_USER ]]; then
	exec sudo -H -u $DBSCRIPTS_USER "$0" "$@"
# TODO: uncomment this again and make sure the testsuite doesn't break because of it
#else
	#cd "$TMPDIR"
fi

# set up general environment
WORKDIR=$(mktemp -d "${TMPDIR}/${0##*/}.XXXXXXXXXX")
LOCKS=()
REPO_MODIFIED=0
declare -a HISTORY_add_files=()
declare -a HISTORY_remove_files=()

# check if messages are to be printed using color
unset ALL_OFF BOLD BLUE GREEN RED YELLOW
if [[ -t 2 ]]; then
	ALL_OFF="$(tput sgr0)"
	BOLD="$(tput bold)"
	BLUE="${BOLD}$(tput setaf 4)"
	GREEN="${BOLD}$(tput setaf 2)"
	RED="${BOLD}$(tput setaf 1)"
	YELLOW="${BOLD}$(tput setaf 3)"
fi
readonly ALL_OFF BOLD BLUE GREEN RED YELLOW

plain() {
	local mesg=$1; shift
	printf "${BOLD}    ${mesg}${ALL_OFF}\n" "$@"
}

msg() {
	local mesg=$1; shift
	printf "${GREEN}==>${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@"
}

msg2() {
	local mesg=$1; shift
	printf "${BLUE}  ->${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@"
}

warning() {
	local mesg=$1; shift
	printf "${YELLOW}==> WARNING:${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

error() {
	local mesg=$1; shift
	printf "${RED}==> ERROR${ALL_OFF}${BOLD} ${mesg}${ALL_OFF}\n" "$@" >&2
}

##
#  usage : in_array( $needle, $haystack )
# return : 0 - found
#          1 - not found
##
in_array() {
	local needle=$1; shift
	[[ -z $1 ]] && return 1 # Not Found
	local item
	for item in "$@"; do
		[[ $item = $needle ]] && return 0 # Found
	done
	return 1 # Not Found
}

##
#  usage : get_full_version( $epoch, $pkgver, $pkgrel )
# return : full version spec, including epoch (if necessary), pkgver, pkgrel
##
get_full_version() {
	if [[ $1 -eq 0 ]]; then
		# zero epoch case, don't include it in version
		echo $2-$3
	else
		echo $1:$2-$3
	fi
}

script_lock() {
	local LOCKDIR="$TMPDIR/.scriptlock.${0##*/}"
	if ! mkdir "$LOCKDIR" >/dev/null 2>&1 ; then
		local _owner="$(/usr/bin/stat -c %U $LOCKDIR)"
		error "Script ${0##*/} is already locked by $_owner."
		exit 1
	else
		set_umask
		return 0
	fi
}

script_unlock() {
	local LOCKDIR="$TMPDIR/.scriptlock.${0##*/}"
	if [ ! -d "$LOCKDIR" ]; then
		warning "Script ${0##*/} was not locked!"
		restore_umask
		return 1
	else
		rmdir "$LOCKDIR"
		restore_umask
		return 0
	fi
}

cleanup() {
	local l
	local repo
	local arch

	trap - EXIT INT QUIT TERM
	for l in ${LOCKS[@]}; do
		repo=${l%.*}
		arch=${l#*.}
		if [ -d "$TMPDIR/.repolock.$repo.$arch" ]; then
			msg "Removing left over lock from [${repo}] (${arch})"
			repo_unlock $repo $arch
		fi
	done
	if [ -d "$TMPDIR/.scriptlock.${0##*/}" ]; then
		msg "Removing left over lock from ${0##*/}"
		script_unlock
	fi
	rm -rf "$WORKDIR"

	if (( REPO_MODIFIED )); then
		date +%s > "${FTP_BASE}/lastupdate"
	fi

	[ "$1" ] && exit $1
}

abort() {
	msg 'Aborting...'
	cleanup 0
}

die() {
	error "$*"
	cleanup 1
}

trap abort INT QUIT TERM HUP
trap cleanup EXIT


#repo_lock <repo-name> <arch> [timeout]
repo_lock () {
	local LOCKDIR="$TMPDIR/.repolock.$1.$2"
	local DBLOCKFILE="${FTP_BASE}/${1}/os/${2}/${1}${DBEXT}.lck"
	local FILESLOCKFILE="${FTP_BASE}/${1}/os/${2}/${1}${FILESEXT}.lck"
	local _count
	local _trial
	local _timeout
	local _lockblock
	local _owner

	# This is the lock file used by repo-add and repo-remove
	if [ -f "${DBLOCKFILE}" ]; then
		error "Repo [${1}] (${2}) is already locked by repo-{add,remove} process $(cat $DBLOCKFILE)"
		return 1
	fi
	if [ -f "${FILESLOCKFILE}" ]; then
		error "Repo [${1}] (${2}) is already locked by repo-{add,remove} process $(cat ${FILESLOCKFILE})"
		return 1
	fi

	if [ $# -eq 2 ]; then
		_lockblock=true
		_trial=0
	elif [ $# -eq 3 ]; then
		_lockblock=false
		_timeout=$3
		let _trial=$_timeout/$LOCK_DELAY
	fi

	_count=0
	while [ $_count -le $_trial ] || $_lockblock ; do
		if ! mkdir "$LOCKDIR" >/dev/null 2>&1 ; then
			_owner="$(/usr/bin/stat -c %U $LOCKDIR)"
			warning "Repo [${1}] (${2}) is already locked by $_owner. "
			msg2 "Retrying in $LOCK_DELAY seconds..."
		else
			LOCKS[${#LOCKS[*]}]="$1.$2"
			set_umask
			return 0
		fi
		sleep $LOCK_DELAY
		let _count=$_count+1
	done

	error "Repo [${1}] (${2}) is already locked by $_owner. Giving up!"
	return 1
}

repo_unlock () { #repo_unlock <repo-name> <arch>
	local LOCKDIR="$TMPDIR/.repolock.$1.$2"
	if [ ! -d "$LOCKDIR" ]; then
		warning "Repo lock [${1}] (${2}) was not locked!"
		restore_umask
		return 1
	else
		rmdir "$LOCKDIR"
		restore_umask
		return 0
	fi
}

# usage: _grep_pkginfo pkgfile pattern
_grep_pkginfo() {
	local _ret

	_ret="$(/usr/bin/bsdtar -xOqf "$1" .PKGINFO | grep -m 1 "^${2} = ")"
	echo "${_ret#${2} = }"
}


# Get the package base or name as fallback
getpkgbase() {
	local _base

	_base="$(_grep_pkginfo "$1" "pkgbase")"
	if [ -z "$_base" ]; then
		getpkgname "$1"
	else
		echo "$_base"
	fi
}

issplitpkg() {
	local _base

	_base="$(_grep_pkginfo "$1" "pkgbase")"
	if [ -z "$_base" ]; then
		return 1
	else
		return 0
	fi
}

# Get the package name
getpkgname() {
	local _name

	_name="$(_grep_pkginfo "$1" "pkgname")"
	if [ -z "$_name" ]; then
		error "Package '$1' has no pkgname in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_name"
}

# Get the pkgver-pkgrel of this package
getpkgver() {
	local _ver

	_ver="$(_grep_pkginfo "$1" "pkgver")"
	if [ -z "$_ver" ]; then
		error "Package '$1' has no pkgver in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_ver"
}

getpkgarch() {
	local _ver

	_ver="$(_grep_pkginfo "$1" "arch")"
	if [ -z "$_ver" ]; then
		error "Package '$1' has no arch in the PKGINFO. Fail!"
		exit 1
	fi

	echo "$_ver"
}

check_packager() {
	local _packager

	_packager=$(_grep_pkginfo "$1" "packager")
	[[ $_packager && $_packager != 'Unknown Packager' ]]
}

getpkgfile() {
	if [[ ${#} -ne 1 ]]; then
		error 'No canonical package found!'
		exit 1
	elif [ ! -f "${1}" ]; then
		error "Package ${1} not found!"
		exit 1
	elif ${REQUIRE_SIGNATURE} && [ ! -f "${1}.sig" ]; then
		error "Package signature ${1}.sig not found!"
		exit 1
	fi

	echo ${1}
}

getpkgfiles() {
	local f
	if [ ! -z "$(echo ${@%\.*} | sed "s/ /\n/g" | sort | uniq -D)" ]; then
		error 'Duplicate packages found!'
		exit 1
	fi

	for f in ${@}; do
		if  [ ! -f "${f}" ]; then
			error "Package ${f} not found!"
			exit 1
		elif ${REQUIRE_SIGNATURE} && [ ! -f "${f}.sig" ]; then
			error "Package signature ${f}.sig not found!"
			exit 1
		fi
	done

	echo ${@}
}

check_pkgfile() {
	local pkgfile=$1

	local pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1

	in_array "${pkgarch}" ${ARCHES[@]} 'any' || return 1

	if echo "${pkgfile##*/}" | grep -q "${pkgname}-${pkgver}-${pkgarch}"; then
		return 0
	else
		return 1
	fi
}

check_pkgrepos() {
	local pkgfile=$1

	local pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1

	[ -f "${FTP_BASE}/${PKGPOOL}/${pkgname}-${pkgver}-${pkgarch}"${PKGEXT} ] && return 1
	[ -f "${FTP_BASE}/${PKGPOOL}/${pkgname}-${pkgver}-${pkgarch}"${PKGEXT}.sig ] && return 1
	[ -f "${FTP_BASE}/${PKGPOOL}/${pkgfile##*/}" ] && return 1
	[ -f "${FTP_BASE}/${PKGPOOL}/${pkgfile##*/}.sig" ] && return 1

	return 0
}

#usage: chk_license ${license[@]}"
chk_license() {
	local l
	for l in ${@}; do
		in_array ${l} ${ALLOWED_LICENSES[@]} && return 0
	done

	return 1
}

check_repo_permission() {
	local repo=$1

	[ ${#PKGREPOS[@]} -eq 0 ] && return 1
	[ -z "${PKGPOOL}" ] && return 1

	in_array "${repo}" ${PKGREPOS[@]} || return 1

	[ -w "$FTP_BASE/${PKGPOOL}" ] || return 1

	local arch
	for arch in ${ARCHES}; do
		local dir="${FTP_BASE}/${repo}/os/${arch}/"
		[ -w "${dir}" ] || return 1
		[ -f "${dir}"${repo}${DBEXT} -a ! -w "${dir}"${repo}${DBEXT} ] && return 1
		[ -f "${dir}"${repo}${FILESEXT} -a ! -w "${dir}"${repo}${FILESEXT} ] && return 1
	done

	return 0
}

set_repo_permission() {
	local repo=$1
	local arch=$2
	local dbfile="${FTP_BASE}/${repo}/os/${arch}/${repo}${DBEXT}"
	local filesfile="${FTP_BASE}/${repo}/os/${arch}/${repo}${FILESEXT}"

	if [ -w "${dbfile}" ]; then
		local group=$(/usr/bin/stat --printf='%G' "$(dirname "${dbfile}")")
		chgrp $group "${dbfile}" || error "Could not change group of ${dbfile} to $group"
		chgrp $group "${filesfile}" || error "Could not change group of ${filesfile} to $group"
		chmod g+w "${dbfile}" || error "Could not set write permission for group $group to ${dbfile}"
		chmod g+w "${filesfile}" || error "Could not set write permission for group $group to ${filesfile}"
	else
		error "You don't have permission to change ${dbfile}"
	fi
}

arch_repo_add() {
	local repo=$1
	local arch=$2
	local pkgs=(${@:3})

	# package files might be relative to repo dir
	pushd "${FTP_BASE}/${repo}/os/${arch}" >/dev/null
	/usr/bin/repo-add -q "${repo}${DBEXT}" ${pkgs[@]} \
		|| error "repo-add ${repo}${DBEXT} ${pkgs[@]}"
	/usr/bin/repo-add -f -q "${repo}${FILESEXT}" ${pkgs[@]} \
		|| error "repo-add -f ${repo}${FILESEXT} ${pkgs[@]}"
	popd >/dev/null
	set_repo_permission "${repo}" "${arch}"

	REPO_MODIFIED=1
}

arch_repo_remove() {
	local repo=$1
	local arch=$2
	local pkgs=(${@:3})
	local dbfile="${FTP_BASE}/${repo}/os/${arch}/${repo}${DBEXT}"
	local filesfile="${FTP_BASE}/${repo}/os/${arch}/${repo}${FILESEXT}"

	if [ ! -f "${dbfile}" ]; then
		error "No database found at '${dbfile}'"
		return 1
	fi
	/usr/bin/repo-remove -q "${dbfile}" ${pkgs[@]} \
		|| error "repo-remove ${dbfile} ${pkgs[@]}"
	/usr/bin/repo-remove -q "${filesfile}" ${pkgs[@]} \
		|| error "repo-remove ${filesfile} ${pkgs[@]}"
	set_repo_permission "${repo}" "${arch}"

	REPO_MODIFIED=1
}

check_pkgfile_pkgbuild() {
	local pkgfile="${1}"
	local _pkgbase="$(getpkgbase ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgname="$(getpkgname ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgver="$(getpkgver ${pkgfile})"
	[ $? -ge 1 ] && return 1
	local _pkgarch="$(getpkgarch ${pkgfile})"
	[ $? -ge 1 ] && return 1

	if [ ! -f "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}" ]; then
		mkdir -p "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}"
		get_file_from_pkgrepo "$_pkgbase" "$_pkgver" PKGBUILD \
			> "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"
		[ $? -ge 1 ] && return 1
	fi

	local pkgbuild_ver="$(. "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"; echo $(get_full_version ${epoch:-0} ${pkgver} ${pkgrel}) )"
	[ "${pkgbuild_ver}" == "${_pkgver}" ] || return 1

	local pkgbuild_names=($(. "${WORKDIR}/pkgbuilds/${repo}-${_pkgarch}/${_pkgbase}"; echo ${pkgname[@]}))
	in_array "${_pkgname}" ${pkgbuild_names[@]} || return 1

	return 0
}

arch_add_to_pool() {
	local pkgfile="$1"
	if [ -f "${pkgfile}" ]; then
		if ! check_pkgfile_pkgbuild "$pkgfile"; then
			warning "package $pkgfile failed check against PKGBUILD. skipping"
			return 0
		fi
		mv "${pkgfile}" "$FTP_BASE/${PKGPOOL}"
	fi

	# also move signatures
	if [ -f "${pkgfile}.sig" ]; then
		mv "${pkgfile}.sig" "$FTP_BASE/${PKGPOOL}"
	fi
}

# add a package file (from the pool) to the database
# call arch_add_to_pool first
arch_db_add() {
	local repo="$1"
	local tarch="$2"
	local pkgfiles=("${@:3}")
	pkgfiles=("${pkgfiles[@]##*/}")
	local dstdir="$FTP_BASE/$repo/os/$tarch"

	for pkgfile in "${pkgfiles[@]}"; do
		local srcfile="$FTP_BASE/${PKGPOOL}/${pkgfile}"

		if [[ ! -f "${srcfile}" ]]; then
			warning "Package file ${pkgfile} not found in ${FTP_BASE}/${PKGPOOL}. skipping"
			return 0
		#else
			# TODO: echo message in db-add executable so this can be used by db-move without unwanted output
			#msg2 "Adding $pkgfile to [$repo]-$tarch..."
		fi

		ln -sr "$srcfile" "$dstdir/"
		if [ -f "${srcfile}.sig" ]; then
			ln -sr "${srcfile}.sig" "$dstdir/"
		fi
	done

	arch_repo_add "${repo}" "${tarch}" "${pkgfiles[@]}"

	for pkgfile in "${pkgfiles[@]}"; do
		arch_history_add "$repo" "$dstdir/$pkgfile" "$tarch"
	done
}

arch_db_remove() {
	local repo=$1
	local arch=$2
	local pkgs=(${@:3})

	arch_repo_remove "$@"

	for pkgname in "${pkgs[@]}"; do
		arch_history_remove "$repo" "$pkgname" "$arch"
	done
}

arch_db_move() {
	local repo_from=$1
	local repo_to=$2
	local arch=$3
	local pkgnames=(${@:4})


	local ftppath_from="${FTP_BASE}/${repo_from}/os/"

	# TODO: detect if a pkgname has been removed from a split package and clean up the repo
	for pkgname in "${pkgnames[@]}"; do
		pkgentry=$(pkgentry_from_db "$repo_from" "$arch" "$pkgname")
		pkgs=($(getpkgfiles "$ftppath_from$arch/$pkgentry"*${PKGEXT}))

		if [[ -z $pkgentry ]]; then
			warning "Failed to detect pkgentry for $pkgname"
			return 1
		fi

		for pkg in "${pkgs[@]}"; do
			pkgname=$(getpkgname "$pkg")
			arch_db_add "${repo_to}" "$arch" "${pkg##*/}"
			arch_db_remove "${repo_from}" "$arch" "$pkgname"
		done
	done
}

arch_history_add() {
	local repo="$1"
	local pkgfile="$2"
	local tarch="$3"
	local pkgname=$(getpkgname "$pkgfile")
	local pkgbase=$(getpkgbase "$pkgfile")
	local pkgver=$(getpkgver "$pkgfile")

	local history_file="$HISTORYREPO/$repo/$tarch/$pkgname"

	mkdir -p "${history_file%/*}"
	echo "$pkgbase $pkgver" > "$history_file"

	HISTORY_add_files=("${HISTORY_add_files[@]}" "$history_file")
}

arch_history_remove() {
	local repo="$1"
	local pkgname="$2"
	local tarch="$3"

	local history_file="$HISTORYREPO/$repo/$tarch/$pkgname"

	[[ -f "$history_file" ]] || return 1

	HISTORY_remove_files=("${HISTORY_remove_files[@]}" "$history_file")
}

arch_history_commit() {
	pushd "$HISTORYREPO" >/dev/null
		did_work=0
		if ((${#HISTORY_add_files[@]} > 0)); then
			git add -- "${HISTORY_add_files[@]}"
			did_work=1
		fi
		if ((${#HISTORY_remove_files[@]} > 0)); then
			git rm -q -- "${HISTORY_remove_files[@]}"
			did_work=1
		fi
		if ((did_work)); then
			git commit -q -m "$1"
		fi
	popd >/dev/null
}

pkgentry_from_db() {
	local repo="$1"
	local arch="$2"
	local pkgname="$3"

	local db="$FTP_BASE/$repo/os/$arch/$repo$DBEXT"
	local line

	for line in $(tar tf "$db" | sed -n 's#^\([^/]*\)/$#\1#p'); do
		local name=${line##*/}
		if [[ ${line%-*-*} = $pkgname ]]; then
			echo $name
			return 0
		fi
	done

	return 1
}

# get_file_from_pkgrepo pkgbase tag filename
#
# Get a file from the package's git/svn/whatever repo.
# tag is the full package version (epoch:pkgver-pkgrel) or depending on how
# the VCS is used any other recognized tag.
#
# Implementation note: This function should be the only one directly
# interacting with the given VCS and should automatically detect
# where a pkgbase is stored if multiple VCSs are used.
get_file_from_pkgrepo() {
	local pkgbase="$1"
	local tag="$2"
	local filename="$3"

	# TODO: implement svn/git extraction
	# for git: cd $whereever; git show $tag:$filename
	#curl -s https://projects.archlinux.org/svntogit/community.git/plain/trunk/$filename?h=packages/$pkgbase
	# TODO: this requires us to restructure the repos
	arch_svn cat "${SVNREPO}/${pkgbase}/tags/$tag/$filename"
	#arch_svn cat "${SVNREPO}/${pkgbase}/trunk/$filename"
}

get_dir_from_pkgrepo() {
	local pkgbase="$1"
	local tag="$2"
	local src="$3"
	local dest="$4"

	# TODO: implement svn/git extraction
	# for git: use git archive?
	arch_svn export -q "${SVNREPO}/${pkgbase}/tags/${tag}/${src}" "${dest}"
}

arch_svn() {
	if [ -z "${SVNUSER}" ]; then
		/usr/bin/svn "${@}"
	else
		sudo -u "${SVNUSER}" -- /usr/bin/svn --username "${SUDO_USER}" "${@}"
	fi
}