nixpkgs/pkgs/applications/audio/spotify/update.sh

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channel="stable" # stable/candidate/edge
nixpkgs="$(git rev-parse --show-toplevel)"
spotify_nix="$nixpkgs/pkgs/applications/audio/spotify/default.nix"
# create bash array from snap info
snap_info=($(
curl -H 'X-Ubuntu-Series: 16' \
"https://api.snapcraft.io/api/v1/snaps/details/spotify?channel=$channel" \
| jq --raw-output \
'.revision,.download_sha512,.version,.last_updated'
))
revision="${snap_info[0]}"
sha512="${snap_info[1]}"
version="${snap_info[2]}"
last_updated="${snap_info[3]}"
# find the last commited version
version_pre=$(
git grep 'version\s*=' HEAD "$spotify_nix" \
| sed -Ene 's/.*"(.*)".*/\1/p'
)
if [[ "$version_pre" = "$version" ]]; then
echo "Spotify is already up ot date"
exit 0
fi
echo "Updating from ${version_pre} to ${version}, released on ${last_updated}"
# search-andreplace revision, hash and version
sed --regexp-extended \
-e 's/rev\s*=\s*"[0-9]+"\s*;/rev = "'"${revision}"'";/' \
-e 's/sha512\s*=\s*".{128}"\s*;/sha512 = "'"${sha512}"'";/' \
-e 's/version\s*=\s*".*"\s*;/version = "'"${version}"'";/' \
-i "$spotify_nix"
if ! nix-build -A spotify "$nixpkgs"; then
echo "The updated spotify failed to build."
exit 1
fi
git add "$spotify_nix"
# show diff for review
git diff HEAD
# prepare commit message, but allow edit
git commit --edit --message "spotify: $version_pre -> $version"