Split photoalbum source into lib modules

1 files changed, 172 insertions, 0 deletions

diff --git a/src/lib/system.source.sh b/src/lib/system.source.sh
new file mode 100644
index 0000000..9fad90b
--- /dev/null
+++ b/src/lib/system.source.sh
@@ -0,0 +1,172 @@
+# shellcheck disable=SC2034
+resolve_imagemagick_command() {
+    local -r operation="$1"; shift
+    local -n command_ref="$1"; shift
+
+    command_ref=()
+
+    case "$operation" in
+        convert)
+            if command -v magick >/dev/null 2>&1; then
+                command_ref=(magick)
+                return
+            fi
+            if command -v convert >/dev/null 2>&1; then
+                command_ref=(convert)
+                return
+            fi
+            ;;
+        identify)
+            if command -v magick >/dev/null 2>&1; then
+                command_ref=(magick identify)
+                return
+            fi
+            if command -v identify >/dev/null 2>&1; then
+                command_ref=(identify)
+                return
+            fi
+            if command -v convert >/dev/null 2>&1; then
+                command_ref=(convert)
+                return
+            fi
+            ;;
+        *)
+            printf 'ERROR: Unknown ImageMagick operation %s\n' \
+                "$operation" >&2
+            return 1
+            ;;
+    esac
+
+    printf 'ERROR: ImageMagick is required; install magick or convert\n' >&2
+    return 127
+}
+
+imagemagick() {
+    local -a imagemagick_command=()
+
+    resolve_imagemagick_command convert imagemagick_command || return
+
+    run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+        "${imagemagick_command[@]}" "$@"
+}
+
+imagemagick_identify() {
+    local -a imagemagick_command=()
+
+    resolve_imagemagick_command identify imagemagick_command || return
+
+    if [ "${imagemagick_command[0]}" = convert ]; then
+        if [[ "${1:-}" = '-verbose' && $# -eq 2 ]]; then
+            run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+                "${imagemagick_command[@]}" "$2" -verbose info:
+        else
+            run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+                "${imagemagick_command[@]}" "$@" info:
+        fi
+        return
+    fi
+
+    run_with_timeout ImageMagick "$IMAGEMAGICK_TIMEOUT" \
+        "${imagemagick_command[@]}" "$@"
+}
+
+run_with_timeout() {
+    local -r description="$1"; shift
+    local -r seconds="$1"; shift
+    local -i status=0
+
+    if ! command -v timeout >/dev/null 2>&1; then
+        printf 'ERROR: timeout command is required to run %s\n' \
+            "$description" >&2
+        return 127
+    fi
+
+    if timeout "$seconds" "$@"; then
+        return
+    else
+        status=$?
+    fi
+
+    if (( status == 124 )); then
+        printf 'ERROR: %s timed out after %s seconds\n' \
+            "$description" "$seconds" >&2
+    fi
+
+    return "$status"
+}
+
+tarball() {
+    local -r tarball_name="$1"; shift
+    local -r tarball_suffix="${TARBALL_SUFFIX:-.tar}"
+    local base
+    local old_tarball
+    local -a tar_opts=()
+
+    # Cleanup tarballs from previous runs for the configured suffix.
+    while IFS= read -r -d '' old_tarball; do
+        if [[ "$old_tarball" == *"$tarball_suffix" ]]; then
+            rm -f "$old_tarball"
+        fi
+    done < <(find "$DIST_DIR" -maxdepth 1 -type f -print0)
+
+    base=$(basename "$INCOMING_DIR")
+    resolve_tar_opts tar_opts
+
+    log_info "Creating tarball $(_display_path "$DIST_DIR/$tarball_name")" \
+        "from $INCOMING_DIR"
+    (
+        cd "$(dirname "$INCOMING_DIR")"
+        run_with_timeout tar "$TAR_TIMEOUT" \
+            tar "${tar_opts[@]}" -f "$DIST_DIR/$tarball_name" "$base"
+    )
+}
+
+resolve_tar_opts() {
+    local -n options_ref="$1"; shift
+    local tar_opts_decl
+
+    options_ref=()
+
+    if ! tar_opts_decl=$(declare -p TAR_OPTS 2>/dev/null); then
+        options_ref=(-c)
+        return
+    fi
+
+    case "$tar_opts_decl" in
+        declare\ -a*\ TAR_OPTS=*)
+            options_ref=("${TAR_OPTS[@]}")
+            ;;
+        *)
+            if [ -n "${TAR_OPTS:-}" ]; then
+                read -r -a options_ref <<< "$TAR_OPTS"
+            fi
+            ;;
+    esac
+
+    if (( ${#options_ref[@]} == 0 )); then
+        options_ref=(-c)
+    fi
+}
+
+resolve_sync_destinations() {
+    local -n destinations_ref="$1"; shift
+    local destinations_decl
+
+    destinations_ref=()
+
+    if ! destinations_decl=$(declare -p SYNC_DESTINATIONS 2>/dev/null); then
+        return
+    fi
+
+    case "$destinations_decl" in
+        declare\ -a*\ SYNC_DESTINATIONS=*)
+            destinations_ref=("${SYNC_DESTINATIONS[@]}")
+            ;;
+        *)
+            if [ -n "${SYNC_DESTINATIONS:-}" ]; then
+                # shellcheck disable=SC2034
+                read -r -a destinations_ref <<< "$SYNC_DESTINATIONS"
+            fi
+            ;;
+    esac
+}