Using deprecated flag: --package-prefix. Please use --packag

Error message

Using deprecated flag: --package-prefix. Please use --package-name-prefix

What it means

Error "Using deprecated flag: --package-prefix. Please use --package-name-prefix" thrown in jordansissel/fpm.

Source

Thrown at lib/fpm/package/gem.rb:24

require "yaml"

# A rubygems package.
#
# This does not currently support 'output'
#
# The following attributes are supported:
#
# * :gem_bin_path
# * :gem_package_name_prefix
# * :gem_gem
class FPM::Package::Gem < FPM::Package
  # Flags '--foo' will be accessable  as attributes[:gem_foo]
  option "--bin-path", "DIRECTORY", "The directory to install gem executables"
  option "--package-prefix", "NAMEPREFIX",
    "(DEPRECATED, use --package-name-prefix) Name to prefix the package " \
    "name with." do |value|
    logger = Cabin::Channel.get
    logger.warn("Using deprecated flag: --package-prefix. Please use " \
                 "--package-name-prefix")
    value
  end
  option "--package-name-prefix", "PREFIX", "Name to prefix the package " \
    "name with.", :default => "rubygem"
  option "--gem", "PATH_TO_GEM",
          "The path to the 'gem' tool (defaults to 'gem' and searches " \
          "your $PATH)", :default => "gem"
  option "--shebang", "SHEBANG",
          "Replace the shebang in the executables in the bin path with a " \
          "custom string", :default => nil
  option "--fix-name", :flag, "Should the target package name be prefixed?",
    :default => true
  option "--fix-dependencies", :flag, "Should the package dependencies be " \
    "prefixed?", :default => true
  option "--env-shebang", :flag, "Should the target package have the " \
    "shebang rewritten to use env?", :default => true

View on GitHub (pinned to b6d77ba72a)

When it happens

Trigger: Thrown at lib/fpm/package/gem.rb:24 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of jordansissel/fpm@b6d77ba72a (2026-08-21). Data as JSON: /api/errors/03e655bb464ed283. Report an issue: GitHub.