1

# Idempotent refreshable operations

     2

     3

apply_GETOPTS='pFn'

     4

     5

APPLY=

     6

APPLY_DIFF=

     7

     8

function apply_help {

     9

    cat <<END

    10

Apply:

    11

    -p      show changes

    12

    -F      force-updates without checking src mtime

    13

    -n      no-op/mock-update; don't actually change/deploy anything; implies -SpC

    14

END

    15

}

    16

    17

function apply_opt {

    18

    local opt=$1

    19

    local optarg="$2"

    20

    21

    case $opt in

    22

        p)  APPLY_DIFF=1   ;;

    23

        F)  APPLY=1 ;;

    24

    25

        n) 

    26

            APPLY=0

    27

            APPLY_DIFF=1

    28

        ;;

    29

        *)  return 1

    30

    esac

    31

}

    32

    33

. $LIB/pvl/apply/dir.sh

    34

. $LIB/pvl/apply/link.sh

    35

. $LIB/pvl/apply/cmd.sh

    36

. $LIB/pvl/apply/cat.sh

    37

    38

## Compare the given output file with all given source files:

    39

#

    40

#   check_update $out ${deps[@]} && do_update $out ... || ...

    41

#

    42

# Returns true if the output file needs to be updated.

    43

function apply_check {

    44

    local update=

    45

    local out="$1"

    46

    47

    debug "$out"

    48

    49

    if [ ${#@} -eq 1 ]; then

    50

        debug "  update: unknown deps"

    51

        return 0

    52

    53

    elif [ ! -e "$out" ]; then

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        debug "  update: dest missing"

    55

        return 0

    56

    57

    elif [ "$APPLY" = 1]; then

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        debug "  update: forced"

    59

        return 2

    60

    fi

    61

    62

    # check deps

    63

    for dep in "${@:2}"; do

    64

        # check

    65

        if [ ! -e "$dep" ]; then

    66

            warn "$out: Missing source: $dep"

    67

    68

        elif [ "$out" -ot "$dep" ]; then

    69

            debug "  update: $dep"

    70

            return 1

    71

        else

    72

            debug "  check: $dep"

    73

        fi

    74

    done

    75

    76

    debug "  up-to-date"

    77

    return 0

    78

}