nix package update apply helper

mass-update.sh

#!/usr/bin/env bash

EXEC=$(dirname ${BASH_SOURCE[0]})/nixpkgs-update-pkg.sh

if [[ ! -e $1 ]]; then
    echo "Does not exist: $1"
    echo "Exit."
    exit 1
fi

while read remote pr pkg update_branch; do
    $EXEC $remote $pr $pkg $update_branch
    if [[ ! $? ]]; then
        echo ""
        echo "Failed at: $remote $pr $pkg $update_branch"
        echo "Exiting"
    fi
done < $1

nixpkgs-update-pkg.sh

#!/usr/bin/env bash

Color_Off='\e[0m'
Red='\e[0;31m'
Yellow='\e[0;33m'
Green='\e[0;32m'

#
# Print on stderr, in red
#
stderr() {
    echo -e "${Red}[$(basename $0)]: ${*}${Color_Off}" >&2
}

#
# Print debugging output on stderr, in green
#
dbg() {
    [[ $DEBUG -eq 1 ]] && \
        echo -e "${Green}[DEBUG][$(basename $0)]: ${*}${Color_Off}" >&2
}

#
# Print on stdout, if verbosity is enabled, prefix in green
#
stdout() {
    echo -e "${Green}[$(basename $0)]:${Color_Off} $*"
}

#
# Explain the next command
#
explain() {
    stdout "$*"
    $*
}

REMOTE=$1
PR=$2
PKG=$3
UPDATE_BRANCH=$4

CORES=$(if [[ -z "$NIX_CORES" ]]; then echo ""; else echo "--cores $NIX_CORES"; fi)
JOBS=$(if [[ -z "$NIX_JOBS" ]]; then echo ""; else echo "-j $NIX_JOBS"; fi)

dbg "Running with cores: '$CORES'"
dbg "Running with jobs:  '$JOBS'"

dbg "checking out $REMOTE/pr/$PR"
git checkout $REMOTE/pr/$PR

dbg "Building..."
explain nix-build -A $PKG $CORES $JOBS
success=$?
dbg "Building done"

if [[ $success ]]
then
    stdout "Success building $PKG"

    dbg "Getting revisions between the merge-base and master"
    revisions=$(git log --pretty=%H master..HEAD)

    dbg "Checking out '$UPDATE_BRANCH'"
    git checkout $UPDATE_BRANCH || \
        (stderr "$UPDATE_BRANCH is not a git branch"; exit 1)

    dbg "for each revision, try to apply on $UPDATE_BRANCH"
    for revision in $revisions; do
        dbg "Applying $revision"
        git cherry-pick $revision
        if [[ ! $? ]]; then
            stderr "Apply failed. Exiting"
            exit 1
        fi
    done

    stdout "Applied changes to update branch"
else
    stderr "No success building..."
fi