summaryrefslogtreecommitdiffstats
path: root/functions
blob: 9c577f0d2b800b2406879d791b73318fd9c5921b (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
#!/bin/bash

parseopts() {
    local opt= optarg= i= shortopts=$1
    local -a longopts=() unused_argv=()

    shift
    while [[ $1 && $1 != '--' ]]; do
        longopts+=("$1")
        shift
    done
    shift

    longoptmatch() {
        local o longmatch=()
        for o in "${longopts[@]}"; do
            if [[ ${o%:} = "$1" ]]; then
                longmatch=("$o")
                break
            fi
            [[ ${o%:} = "$1"* ]] && longmatch+=("$o")
        done

        case ${#longmatch[*]} in
            1)
                # success, override with opt and return arg req (0 == none, 1 == required)
                opt=${longmatch%:}
                if [[ $longmatch = *: ]]; then
                    return 1
                else
                    return 0
                fi ;;
            0)
                # fail, no match found
                return 255 ;;
            *)
                # fail, ambiguous match
                printf "%s: option '%s' is ambiguous; possibilities:%s\n" "${0##*/}" \
                    "--$1" "$(printf " '%s'" "${longmatch[@]%:}")"
                return 254 ;;
        esac
    }

    while (( $# )); do
        case $1 in
            --) # explicit end of options
                shift
                break
                ;;
            -[!-]*) # short option
                for (( i = 1; i < ${#1}; i++ )); do
                    opt=${1:i:1}

                    # option doesn't exist
                    if [[ $shortopts != *$opt* ]]; then
                        printf "%s: invalid option -- '%s'\n" "${0##*/}" "$opt"
                        OPTRET=(--)
                        return 1
                    fi

                    OPTRET+=("-$opt")
                    # option requires optarg
                    if [[ $shortopts = *$opt:* ]]; then
                        # if we're not at the end of the option chunk, the rest is the optarg
                        if (( i < ${#1} - 1 )); then
                            OPTRET+=("${1:i+1}")
                            break
                        # if we're at the end, grab the the next positional, if it exists
                        elif (( i == ${#1} - 1 )) && [[ $2 ]]; then
                            OPTRET+=("$2")
                            shift
                            break
                        # parse failure
                        else
                            printf "%s: option '%s' requires an argument\n" "${0##*/}" "-$opt"
                            OPTRET=(--)
                            return 1
                        fi
                    fi
                done
                ;;
            --?*=*|--?*) # long option
                IFS='=' read -r opt optarg <<< "${1#--}"
                longoptmatch "$opt"
                case $? in
                    0)
                        if [[ $optarg ]]; then
                            printf "%s: option '--%s' doesn't allow an argument\n" "${0##*/}" "$opt"
                            OPTRET=(--)
                            return 1
                        else
                            OPTRET+=("--$opt")
                            shift
                            continue 2
                        fi
                        ;;
                    1)
                        # --longopt=optarg
                        if [[ $optarg ]]; then
                            OPTRET+=("--$opt" "$optarg")
                            shift
                        # --longopt optarg
                        elif [[ $2 ]]; then
                            OPTRET+=("--$opt" "$2" )
                            shift 2
                        else
                            printf "%s: option '--%s' requires an argument\n" "${0##*/}" "$opt"
                            OPTRET=(--)
                            return 1
                        fi
                        continue 2
                        ;;
                    254)
                        # ambiguous option -- error was reported for us by longoptmatch()
                        OPTRET=(--)
                        return 1
                        ;;
                    255)
                        # parse failure
                        printf "%s: unrecognized option '%s'\n" "${0##*/}" "--$opt"
                        OPTRET=(--)
                        return 1
                        ;;
                esac
                ;;
            *) # non-option arg encountered, add it as a parameter
                unused_argv+=("$1")
                ;;
        esac
        shift
    done

    # add end-of-opt terminator and any leftover positional parameters
    OPTRET+=('--' "${unused_argv[@]}" "$@")
    unset longoptmatch

    return 0
}

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

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

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

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

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

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

in_array() {
    # Search for an element in an array.
    #   $1: needle
    #   ${@:2}: haystack

    local item= needle=$1; shift

    for item in "$@"; do
        [[ $item = $needle ]] && return 0 # Found
    done
    return 1 # Not Found
}

funcgrep() {
    awk -v funcmatch="$1" '
        /^[[:space:]]*[[:alnum:]_]+[[:space:]]*\([[:space:]]*\)/ {
            match($1, funcmatch)
            print substr($1, RSTART, RLENGTH)
        }' "$2"
}

list_hookpoints() {
    local funcs

    [[ -e ${1/install/hooks} ]] || return 0

    mapfile -t funcs < <(funcgrep '^run_[[:alnum:]_]+' "${1/install/hooks}")

    echo
    msg "This hook has runtime scripts:"
    in_array run_earlyhook "${funcs[@]}" && msg2 "early hook"
    in_array run_hook "${funcs[@]}" && msg2 "pre-mount hook"
    in_array run_latehook "${funcs[@]}" && msg2 "post-mount hook"
    in_array run_cleanuphook "${funcs[@]}" && msg2 "cleanup hook"
}

auto_modules() {
    # Perform auto detection of modules via sysfs.

    local mods=

    IFS=$'\n' read -rd '' -a mods < \
        <(find /sys/devices -name modalias -exec sort -u {} + |
        # delimit each input by a newline, expanded in place
        xargs -d $'\n' modprobe -qaRS "$KERNELVERSION" |
        sort -u)

    printf "%s\n" "${mods[@]//-/_}"
    (( ${#mods[*]} ))
}

all_modules() {
    # Add modules to the initcpio, filtered by grep.
    #   $@: filter arguments to grep
    #   -f FILTER: ERE to filter found modules

    local -i count=0
    local mod= OPTIND= OPTARG= filter=()

    while getopts ':f:' flag; do
        case $flag in f) filter+=("$OPTARG") ;; esac
    done
    shift $(( OPTIND - 1 ))

    while read -r -d '' mod; do
        (( ++count ))

        for f in "${filter[@]}"; do
            [[ $mod =~ $f ]] && continue 2
        done

        mod=${mod##*/}
        mod="${mod%.ko*}"
        printf '%s\n' "${mod//-/_}"
    done < <(find "$MODULEDIR" -name '*.ko*' -print0 2>/dev/null | grep -EZz "$@")

    (( count ))
}

add_all_modules() {
    # Add modules to the initcpio.
    #   $@: arguments to all_modules

    local mod mods

    mapfile -t mods < <(all_modules "$@")

    for mod in "${mods[@]}"; do
        add_module "$mod"
    done

    return $(( !${#mods[*]} ))
}

add_checked_modules() {
    # Add modules to the initcpio, filtered by the list of autodetected
    # modules.
    #   $@: arguments to all_modules

    local mod mods

    if [[ -s $MODULE_FILE ]]; then
        mapfile -t mods < <(all_modules "$@" | grep -xFf "$MODULE_FILE")
    else
        mapfile -t mods < <(all_modules "$@")
    fi

    for mod in "${mods[@]}"; do
        add_module "$mod"
    done

    return $(( !${#mods[*]} ))
}

checked_modules() {
    # Returns a list of modules filtered by the list of autodetected modules.
    #   $@: arguments to all_modules
    #
    # DEPRECATED: Use add_checked_modules instead
    #

    if [[ -s $MODULE_FILE ]]; then
        grep -xFf "$MODULE_FILE" <(all_modules "$@")
        return 1
    else
        all_modules "$@"
    fi
}

add_module() {
    # Add a kernel module to the initcpio image. Dependencies will be
    # discovered and added.
    #   $1: module name

    local module= path= dep= deps= field= value=
    local ign_errors=0

    if [[ $1 = *\? ]]; then
        ign_errors=1
        set -- "${1%?}"
    fi

    module=${1%.ko*}

    # skip expensive stuff if this module has already been added
    in_array "${module//-/_}" "${ADDED_MODULES[@]}" && return

    while IFS=':= ' read -r -d '' field value; do
        case "$field" in
            filename)
                path=$value
                ;;
            depends)
                IFS=',' read -r -a deps <<< "$value"
                for dep in "${deps[@]}"; do
                    add_module "$dep"
                done
                ;;
            firmware)
                if [[ -e /usr/lib/firmware/$value ]]; then
                    add_file "/usr/lib/firmware/$value" "/usr/lib/firmware/$value" 644
                fi
                ;;
        esac
    done < <(modinfo -k "$KERNELVERSION" -0 "$module" 2>/dev/null)

    if [[ -z $path ]]; then
        (( ign_errors )) && return 0
        error "module not found: \`%s'" "$module"
        return 1
    fi

    # aggregate modules and add them all at once to save some forks
    (( QUIET )) || plain "adding module: %s" "$1"
    MODPATHS+=("$path")
    ADDED_MODULES+=("${module//-/_}")

    # handle module quirks
    case $module in
        fat)
            add_module "nls_cp437?"
            ;;
        ocfs2)
            add_module "configfs?"
            ;;
        libcrc32c)
            add_module "crc32c_intel?"
            add_module "crc32c?"
            ;;
    esac
}

add_full_dir() {
    # Add a directory and all its contents, recursively, to the initcpio image.
    # No parsing is performed and the contents of the directory is added as is.
    #   $1: path to directory

    local f=

    if [[ -n $1 && -d $1 ]]; then
        for f in "$1"/*; do
            if [[ -L $f ]]; then
                add_symlink "$f" "$(readlink "$f")"
            elif [[ -d $f ]]; then
                add_dir "$f"
                add_full_dir "$f"
            elif [[ -f $f ]]; then
                add_file "$f"
            fi
        done
    fi
}

add_dir() {
    # add a directory (with parents) to $BUILDROOT
    #   $1: pathname on initcpio
    #   $2: mode (optional)

    if [[ -z $1 || $1 != /?* ]]; then
        return 1
    fi

    local path=$1 mode=${2:-755}

    if [[ -d $BUILDROOT$1 ]]; then
        # ignore dir already exists
        return 0
    fi

    (( QUIET )) || plain "adding dir: %s" "$path"
    command install -dm$mode "$BUILDROOT$path"
}

add_symlink() {
    # Add a symlink to the initcpio image.
    #   $1: pathname of symlink on image
    #   $2: absolute path to target of symlink

    (( $# == 2 )) || return 1

    add_dir "${1%/*}"

    if (( ! QUIET )); then
        if [[ -L $BUILDROOT$1 ]]; then
            plain "overwriting symlink %s -> %s" "$1" "$2"
        else
            plain "adding symlink: %s -> %s" "$1" "$2"
        fi
    fi
    ln -sfn "$2" "$BUILDROOT$1"
}

add_file() {
    # Add a plain file to the initcpio image. No parsing is performed and only
    # the singular file is added.
    #   $1: path to file
    #   $2: destination on initcpio (optional, defaults to same as source)
    #   $3: mode

    (( $# )) || return 1

    # determine source and destination
    local src=$1 dest=${2:-$1} mode=

    if [[ ! -f $src ]]; then
        error "file not found: \`%s'" "$src"
        return 1
    fi

    mode=${3:-$(stat -c %a "$src")}
    if [[ -z $mode ]]; then
        error "failed to stat file: \`%s'." "$src"
        return 1
    fi

    if (( ! QUIET )); then
        if [[ -e $BUILDROOT$dest ]]; then
            plain "overwriting file: %s" "$dest"
        else
            plain "adding file: %s" "$dest"
        fi
    fi
    command install -Dm$mode "$src" "$BUILDROOT$dest"
}

add_runscript() {
    # Adds a runtime script to the initcpio image. The name is derived from the
    # script which calls it, though it can be overriden by passing the name of
    # the runtime hook as the first argument to the function. This shouldn't be
    # needed and is only left for legacy compatability reasons. It may not work
    # in future versions of mkinitcpio.

    local funcs fn script hookname=${SCRIPT:-${BASH_SOURCE[1]##*/}}

    if ! script=$(find_in_dirs "$hookname" "${HOOKDIR[@]}"); then
        error "runtime script for \`%s' not found" "$hookname"
        return
    fi

    add_file "$script" "/hooks/$hookname" 755

    mapfile -t funcs < <(funcgrep '^run_[[:alnum:]_]+' "$script")

    for fn in "${funcs[@]}"; do
        case $fn in
            run_earlyhook)
                RUNHOOKS['early']+=" $hookname"
                ;;
            run_hook)
                RUNHOOKS['hooks']+=" $hookname"
                ;;
            run_latehook)
                RUNHOOKS['late']+=" $hookname"
                ;;
            run_cleanuphook)
                RUNHOOKS['cleanup']="$hookname ${RUNHOOKS['cleanup']}"
                ;;
        esac
    done
}

add_binary() {
    # Add a binary file to the initcpio image. library dependencies will
    # be discovered and added.
    #   $1: path to binary
    #   $2: destination on initcpio (optional, defaults to same as source)

    local -a sodeps
    local line= regex= binary= dest= mode= sodep= resolved= dirname=

    if [[ ${1:0:1} != '/' ]]; then
        binary=$(type -P "$1")
    else
        binary=$1
    fi

    if [[ ! -f $binary ]]; then
        error "file not found: \`%s'" "$1"
        return 1
    fi

    dest=${2:-$binary}
    mode=$(stat -c %a "$binary")

    # always add the binary itself
    add_file "$binary" "$dest" "$mode"

    # negate this so that the RETURN trap is not fired on non-binaries
    ! lddout=$(ldd "$binary" 2>/dev/null) && return 0

    # resolve sodeps
    regex='(/.+) \(0x[a-fA-F0-9]+\)'
    while read line; do
        if [[ $line =~ $regex ]]; then
            sodep=${BASH_REMATCH[1]}
        elif [[ $line = *'not found' ]]; then
            error "binary dependency \`%s' not found for \`%s'" "${line%% *}" "$1"
            (( ++builderrors ))
            continue
        fi

        if [[ -f $sodep && ! -e $BUILDROOT$sodep ]]; then
            if [[ ! -L $sodep ]]; then
                add_file "$sodep" "$sodep" "$(stat -c %a "$sodep")"
            else
                resolved=$(readlink -e "$sodep")
                dirname=${resolved%/*}
                add_dir "$dirname" 755
                add_symlink "$sodep" "$resolved"
                add_file "$resolved" "$resolved" 755
            fi
        fi
    done <<< "$lddout"

    return 0
}

parse_hook() {
    # parse key global variables set by install hooks. This function is called
    # prior to the start of hook processing, and after each hook's build
    # function is run.

    local item=

    for item in $MODULES; do
        add_module "$item"
    done

    for item in $BINARIES; do
        add_binary "$item"
    done

    for item in $FILES; do
        add_file "$item"
    done

    if [[ $SCRIPT ]]; then
        add_runscript "$SCRIPT"
    fi
}

find_in_dirs() {
    local dir

    for dir in "${@:2}"; do
        if [[ -e $dir/$1 ]]; then
            printf '%s' "$dir/$1"
            return 0
        fi
    done

    return 1
}

write_image_config() {
    # write a config file. re-source the config as we can't guarantee the
    # environment hasn't been modified, but subshell it so it doesn't disturb
    # anyone else.
    (
        . "$CONFIG"

        # sanitize of any extra whitespace
        read -ra modules <<<"${MODULES//-/_}"
        for mod in "${modules[@]}"; do
            in_array "${mod%\?}" "${ADDED_MODULES[@]}" || continue
            add+=("${mod%\?}")
        done
        (( ${#add[*]} )) && printf 'MODULES="%s"\n' "${add[*]}"

        printf '%s="%s"\n' \
            'EARLYHOOKS' "${RUNHOOKS['early']# }" \
            'HOOKS' "${RUNHOOKS['hooks']# }" \
            'LATEHOOKS' "${RUNHOOKS['late']# }" \
            'CLEANUPHOOKS' "${RUNHOOKS['cleanup']% }"

    ) >"$BUILDROOT/config"
}

initialize_buildroot() {
    # creates a temporary directory for the buildroot and initialize it with a
    # basic set of necessary directories and symlinks

    local workdir= kernver=$1

    if ! workdir=$(mktemp -d --tmpdir mkinitcpio.XXXXXX); then
        error 'Failed to create temporary working directory in %s' "${TMPDIR:-/tmp}"
        return 1
    fi

    # base directory structure
    install -dm755 "$workdir/root"/{new_root,proc,sys,dev,run,tmp,etc,usr/{local,lib,bin}}
    ln -s "usr/lib" "$workdir/root/lib"
    ln -s "../lib"  "$workdir/root/usr/local/lib"
    ln -s "bin"     "$workdir/root/usr/sbin"
    ln -s "usr/bin" "$workdir/root/bin"
    ln -s "usr/bin" "$workdir/root/sbin"
    ln -s "../bin"  "$workdir/root/usr/local/bin"

    # kernel module dir
    install -dm755 "$workdir/root/usr/lib/modules/$kernver/kernel"

    # indicate that this is an initramfs
    >"$workdir/root/etc/initrd-release"

    printf '%s' "$workdir"
}

run_build_hook() {
    local hook=$1 script= realscript=
    local MODULES= BINARIES= FILES= SCRIPT=

    # find script in install dirs
    if ! script=$(find_in_dirs "$hook" "${INSTDIR[@]}"); then
        error "Hook '$hook' cannot be found"
        return 1
    fi

    # check for deprecation
    if [[ -L $script ]]; then
        if ! realscript=$(readlink -e "$script"); then
            error "$script is a broken symlink to $(readlink "$script")"
            return 1
        fi
        warning "Hook '%s' is deprecated. Replace it with '%s' in your config" "$script" "$realscript"
        script=$realscript
    fi

    # source
    unset -f build
    if ! . "$script"; then
        error 'Failed to read %s' "$script"
        return 1
    fi

    if ! declare -f build >/dev/null; then
        error 'Hook '$script' has no build function'
        return 1
    fi

    # run
    msg2 "Running build hook: [%s]" "${script##*/}"
    build
    parse_hook
}

# vim: set ft=sh ts=4 sw=4 et: