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|
defmodule Mix.Tasks.Local.Hex do
use Mix.Task
@hex_list_path "/installs/hex-1.x.csv"
@hex_archive_path "/installs/[ELIXIR_VERSION]/hex-[HEX_VERSION].ez"
@shortdoc "Installs Hex locally"
@moduledoc """
Installs Hex locally.
$ mix local.hex [version]
By default the latest compatible version of Hex will be installed, unless
`version` is specified.
If installing a precompiled Hex does not work, you can compile and install
Hex directly with this command:
$ mix archive.install github hexpm/hex branch latest
## Command line options
* `--force` - forces installation without a shell prompt; primarily
intended for automation in build systems like `make`
* `--if-missing` - performs installation only if Hex is not installed yet;
intended to avoid repeatedly reinstalling Hex in automation when a script
may be run multiple times
If both options are set, the shell prompt is skipped and Hex is not
re-installed if it was already installed.
## Mirrors
If you want to change the [default mirror](https://repo.hex.pm)
used for fetching Hex, set the `HEX_MIRROR` environment variable.
"""
@switches [if_missing: :boolean, force: :boolean]
@impl true
def run(argv) do
{opts, args} = OptionParser.parse!(argv, switches: @switches)
version = List.first(args)
should_install? =
if Keyword.get(opts, :if_missing, false) do
if version do
not Code.ensure_loaded?(Hex) or
Version.compare(apply(Hex, :version, []), version) == :gt
else
not Code.ensure_loaded?(Hex)
end
else
true
end
argv =
if Keyword.get(opts, :force, false) do
["--force"]
else
[]
end
should_install? && run_install(version, argv)
end
defp run_install(version, argv) do
hex_mirror = Mix.Hex.mirror()
{elixir_version, hex_version, sha512} =
Mix.Local.find_matching_versions_from_signed_csv!(
"Hex",
version,
hex_mirror <> @hex_list_path
)
url =
(hex_mirror <> @hex_archive_path)
|> String.replace("[ELIXIR_VERSION]", elixir_version)
|> String.replace("[HEX_VERSION]", hex_version)
# Unload the Hex module we loaded earlier to avoid conflicts when Hex is updated
# and then used without restarting the VM
:code.purge(Hex)
Mix.Tasks.Archive.Install.run([url, "--sha512", sha512 | argv])
end
end
|
