Revision a7a9fe5721eb9080380cf13c4404cee1cbecf004 authored by Jeff Bezanson on 19 January 2021, 16:47:11 UTC, committed by Kristoffer on 19 January 2021, 21:40:00 UTC
helps #38947 (cherry picked from commit e8f23d7d3e2eb4c4550637af6ace95dab4bae49d)
1 parent 4ccfd6d
cmd.jl
# This file is a part of Julia. License is MIT: https://julialang.org/license
abstract type AbstractCmd end
# libuv process option flags
const UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS = UInt8(1 << 2)
const UV_PROCESS_DETACHED = UInt8(1 << 3)
const UV_PROCESS_WINDOWS_HIDE = UInt8(1 << 4)
struct Cmd <: AbstractCmd
exec::Vector{String}
ignorestatus::Bool
flags::UInt32 # libuv process flags
env::Union{Vector{String},Nothing}
dir::String
Cmd(exec::Vector{String}) =
new(exec, false, 0x00, nothing, "")
Cmd(cmd::Cmd, ignorestatus, flags, env, dir) =
new(cmd.exec, ignorestatus, flags, env,
dir === cmd.dir ? dir : cstr(dir))
function Cmd(cmd::Cmd; ignorestatus::Bool=cmd.ignorestatus, env=cmd.env, dir::AbstractString=cmd.dir,
detach::Bool = 0 != cmd.flags & UV_PROCESS_DETACHED,
windows_verbatim::Bool = 0 != cmd.flags & UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS,
windows_hide::Bool = 0 != cmd.flags & UV_PROCESS_WINDOWS_HIDE)
flags = detach * UV_PROCESS_DETACHED |
windows_verbatim * UV_PROCESS_WINDOWS_VERBATIM_ARGUMENTS |
windows_hide * UV_PROCESS_WINDOWS_HIDE
new(cmd.exec, ignorestatus, flags, byteenv(env),
dir === cmd.dir ? dir : cstr(dir))
end
end
has_nondefault_cmd_flags(c::Cmd) =
c.ignorestatus ||
c.flags != 0x00 ||
c.env !== nothing ||
c.dir !== ""
"""
Cmd(cmd::Cmd; ignorestatus, detach, windows_verbatim, windows_hide, env, dir)
Construct a new `Cmd` object, representing an external program and arguments, from `cmd`,
while changing the settings of the optional keyword arguments:
* `ignorestatus::Bool`: If `true` (defaults to `false`), then the `Cmd` will not throw an
error if the return code is nonzero.
* `detach::Bool`: If `true` (defaults to `false`), then the `Cmd` will be run in a new
process group, allowing it to outlive the `julia` process and not have Ctrl-C passed to
it.
* `windows_verbatim::Bool`: If `true` (defaults to `false`), then on Windows the `Cmd` will
send a command-line string to the process with no quoting or escaping of arguments, even
arguments containing spaces. (On Windows, arguments are sent to a program as a single
"command-line" string, and programs are responsible for parsing it into arguments. By
default, empty arguments and arguments with spaces or tabs are quoted with double quotes
`"` in the command line, and `\\` or `"` are preceded by backslashes.
`windows_verbatim=true` is useful for launching programs that parse their command line in
nonstandard ways.) Has no effect on non-Windows systems.
* `windows_hide::Bool`: If `true` (defaults to `false`), then on Windows no new console
window is displayed when the `Cmd` is executed. This has no effect if a console is
already open or on non-Windows systems.
* `env`: Set environment variables to use when running the `Cmd`. `env` is either a
dictionary mapping strings to strings, an array of strings of the form `"var=val"`, an
array or tuple of `"var"=>val` pairs. In order to modify (rather than replace) the
existing environment, initialize `env` with `copy(ENV)` and then set `env["var"]=val` as
desired. To add to an environment block within a `Cmd` object without replacing all
elements, use `addenv()` which will return a `Cmd` object with the updated environment.
* `dir::AbstractString`: Specify a working directory for the command (instead
of the current directory).
For any keywords that are not specified, the current settings from `cmd` are used. Normally,
to create a `Cmd` object in the first place, one uses backticks, e.g.
Cmd(`echo "Hello world"`, ignorestatus=true, detach=false)
"""
Cmd
hash(x::Cmd, h::UInt) = hash(x.exec, hash(x.env, hash(x.ignorestatus, hash(x.dir, hash(x.flags, h)))))
==(x::Cmd, y::Cmd) = x.exec == y.exec && x.env == y.env && x.ignorestatus == y.ignorestatus &&
x.dir == y.dir && isequal(x.flags, y.flags)
struct OrCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
OrCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
struct ErrOrCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
ErrOrCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
struct AndCmds <: AbstractCmd
a::AbstractCmd
b::AbstractCmd
AndCmds(a::AbstractCmd, b::AbstractCmd) = new(a, b)
end
hash(x::AndCmds, h::UInt) = hash(x.a, hash(x.b, h))
==(x::AndCmds, y::AndCmds) = x.a == y.a && x.b == y.b
shell_escape(cmd::Cmd; special::AbstractString="") =
shell_escape(cmd.exec..., special=special)
shell_escape_posixly(cmd::Cmd) =
shell_escape_posixly(cmd.exec...)
escape_microsoft_c_args(cmd::Cmd) =
escape_microsoft_c_args(cmd.exec...)
escape_microsoft_c_args(io::IO, cmd::Cmd) =
escape_microsoft_c_args(io::IO, cmd.exec...)
function show(io::IO, cmd::Cmd)
print_env = cmd.env !== nothing
print_dir = !isempty(cmd.dir)
(print_env || print_dir) && print(io, "setenv(")
print(io, '`')
join(io, map(cmd.exec) do arg
replace(sprint(context=io) do io
with_output_color(:underline, io) do io
print_shell_word(io, arg, shell_special)
end
end, '`' => "\\`")
end, ' ')
print(io, '`')
print_env && (print(io, ","); show(io, cmd.env))
print_dir && (print(io, "; dir="); show(io, cmd.dir))
(print_dir || print_env) && print(io, ")")
nothing
end
function show(io::IO, cmds::Union{OrCmds,ErrOrCmds})
print(io, "pipeline(")
show(io, cmds.a)
print(io, ", ")
print(io, isa(cmds, ErrOrCmds) ? "stderr=" : "stdout=")
show(io, cmds.b)
print(io, ")")
end
function show(io::IO, cmds::AndCmds)
show(io, cmds.a)
print(io, " & ")
show(io, cmds.b)
end
const STDIN_NO = 0
const STDOUT_NO = 1
const STDERR_NO = 2
struct FileRedirect
filename::String
append::Bool
FileRedirect(filename::AbstractString, append::Bool) = FileRedirect(convert(String, filename), append)
function FileRedirect(filename::String, append::Bool)
if lowercase(filename) == (@static Sys.iswindows() ? "nul" : "/dev/null")
@warn "For portability use devnull instead of a file redirect" maxlog=1
end
return new(filename, append)
end
end
# setup_stdio ≈ cconvert
# rawhandle ≈ unsafe_convert
rawhandle(::DevNull) = C_NULL
rawhandle(x::OS_HANDLE) = x
if OS_HANDLE !== RawFD
rawhandle(x::RawFD) = Libc._get_osfhandle(x)
end
const Redirectable = Union{IO, FileRedirect, RawFD, OS_HANDLE}
const StdIOSet = NTuple{3, Redirectable}
struct CmdRedirect <: AbstractCmd
cmd::AbstractCmd
handle::Redirectable
stream_no::Int
readable::Bool
end
CmdRedirect(cmd, handle, stream_no) = CmdRedirect(cmd, handle, stream_no, stream_no == STDIN_NO)
function show(io::IO, cr::CmdRedirect)
print(io, "pipeline(")
show(io, cr.cmd)
print(io, ", ")
if cr.stream_no == STDOUT_NO
print(io, "stdout")
elseif cr.stream_no == STDERR_NO
print(io, "stderr")
elseif cr.stream_no == STDIN_NO
print(io, "stdin")
else
print(io, cr.stream_no)
end
print(io, cr.readable ? "<" : ">")
show(io, cr.handle)
print(io, ")")
end
"""
ignorestatus(command)
Mark a command object so that running it will not throw an error if the result code is non-zero.
"""
ignorestatus(cmd::Cmd) = Cmd(cmd, ignorestatus=true)
ignorestatus(cmd::Union{OrCmds,AndCmds}) =
typeof(cmd)(ignorestatus(cmd.a), ignorestatus(cmd.b))
"""
detach(command)
Mark a command object so that it will be run in a new process group, allowing it to outlive the julia process, and not have Ctrl-C interrupts passed to it.
"""
detach(cmd::Cmd) = Cmd(cmd; detach=true)
# like String(s), but throw an error if s contains NUL, since
# libuv requires NUL-terminated strings
function cstr(s)
if Base.containsnul(s)
throw(ArgumentError("strings containing NUL cannot be passed to spawned processes"))
end
return String(s)
end
# convert various env representations into an array of "key=val" strings
byteenv(env::AbstractArray{<:AbstractString}) =
String[cstr(x) for x in env]
byteenv(env::AbstractDict) =
String[cstr(string(k)*"="*string(v)) for (k,v) in env]
byteenv(env::Nothing) = nothing
byteenv(env::Union{AbstractVector{Pair{T,V}}, Tuple{Vararg{Pair{T,V}}}}) where {T<:AbstractString,V} =
String[cstr(k*"="*string(v)) for (k,v) in env]
"""
setenv(command::Cmd, env; dir="")
Set environment variables to use when running the given `command`. `env` is either a
dictionary mapping strings to strings, an array of strings of the form `"var=val"`, or
zero or more `"var"=>val` pair arguments. In order to modify (rather than replace) the
existing environment, create `env` through `copy(ENV)` and then setting `env["var"]=val`
as desired, or use `addenv`.
The `dir` keyword argument can be used to specify a working directory for the command.
"""
setenv(cmd::Cmd, env; dir="") = Cmd(cmd; env=byteenv(env), dir=dir)
setenv(cmd::Cmd, env::Pair{<:AbstractString}...; dir="") =
setenv(cmd, env; dir=dir)
setenv(cmd::Cmd; dir="") = Cmd(cmd; dir=dir)
"""
addenv(command::Cmd, env...; inherit::Bool = true)
Merge new environment mappings into the given `Cmd` object, returning a new `Cmd` object.
Duplicate keys are replaced. If `command` does not contain any environment values set already,
it inherits the current environment at time of `addenv()` call if `inherit` is `true`.
"""
function addenv(cmd::Cmd, env::Dict; inherit::Bool = true)
new_env = Dict{String,String}()
if cmd.env === nothing
if inherit
merge!(new_env, ENV)
end
else
for (k, v) in split.(cmd.env, "=")
new_env[string(k)::String] = string(v)::String
end
end
for (k, v) in env
new_env[string(k)::String] = string(v)::String
end
return setenv(cmd, new_env)
end
function addenv(cmd::Cmd, pairs::Pair{<:AbstractString}...; inherit::Bool = true)
return addenv(cmd, Dict(k => v for (k, v) in pairs); inherit)
end
function addenv(cmd::Cmd, env::Vector{<:AbstractString}; inherit::Bool = true)
return addenv(cmd, Dict(k => v for (k, v) in split.(env, "=")); inherit)
end
(&)(left::AbstractCmd, right::AbstractCmd) = AndCmds(left, right)
redir_out(src::AbstractCmd, dest::AbstractCmd) = OrCmds(src, dest)
redir_err(src::AbstractCmd, dest::AbstractCmd) = ErrOrCmds(src, dest)
# Stream Redirects
redir_out(dest::Redirectable, src::AbstractCmd) = CmdRedirect(src, dest, STDIN_NO)
redir_out(src::AbstractCmd, dest::Redirectable) = CmdRedirect(src, dest, STDOUT_NO)
redir_err(src::AbstractCmd, dest::Redirectable) = CmdRedirect(src, dest, STDERR_NO)
# File redirects
redir_out(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, false), STDOUT_NO)
redir_out(src::AbstractString, dest::AbstractCmd) = CmdRedirect(dest, FileRedirect(src, false), STDIN_NO)
redir_err(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, false), STDERR_NO)
redir_out_append(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, true), STDOUT_NO)
redir_err_append(src::AbstractCmd, dest::AbstractString) = CmdRedirect(src, FileRedirect(dest, true), STDERR_NO)
"""
pipeline(command; stdin, stdout, stderr, append=false)
Redirect I/O to or from the given `command`. Keyword arguments specify which of the
command's streams should be redirected. `append` controls whether file output appends to the
file. This is a more general version of the 2-argument `pipeline` function.
`pipeline(from, to)` is equivalent to `pipeline(from, stdout=to)` when `from` is a command,
and to `pipeline(to, stdin=from)` when `from` is another kind of data source.
**Examples**:
```julia
run(pipeline(`dothings`, stdout="out.txt", stderr="errs.txt"))
run(pipeline(`update`, stdout="log.txt", append=true))
```
"""
function pipeline(cmd::AbstractCmd; stdin=nothing, stdout=nothing, stderr=nothing, append::Bool=false)
if append && stdout === nothing && stderr === nothing
throw(ArgumentError("append set to true, but no output redirections specified"))
end
if stdin !== nothing
cmd = redir_out(stdin, cmd)
end
if stdout !== nothing
cmd = append ? redir_out_append(cmd, stdout) : redir_out(cmd, stdout)
end
if stderr !== nothing
cmd = append ? redir_err_append(cmd, stderr) : redir_err(cmd, stderr)
end
return cmd
end
pipeline(cmd::AbstractCmd, dest) = pipeline(cmd, stdout=dest)
pipeline(src::Union{Redirectable,AbstractString}, cmd::AbstractCmd) = pipeline(cmd, stdin=src)
"""
pipeline(from, to, ...)
Create a pipeline from a data source to a destination. The source and destination can be
commands, I/O streams, strings, or results of other `pipeline` calls. At least one argument
must be a command. Strings refer to filenames. When called with more than two arguments,
they are chained together from left to right. For example, `pipeline(a,b,c)` is equivalent to
`pipeline(pipeline(a,b),c)`. This provides a more concise way to specify multi-stage
pipelines.
**Examples**:
```julia
run(pipeline(`ls`, `grep xyz`))
run(pipeline(`ls`, "out.txt"))
run(pipeline("out.txt", `grep xyz`))
```
"""
pipeline(a, b, c, d...) = pipeline(pipeline(a, b), c, d...)
## implementation of `cmd` syntax ##
cmd_interpolate(xs...) = cstr(string(map(cmd_interpolate1, xs)...))
cmd_interpolate1(x) = x
cmd_interpolate1(::Nothing) = throw(ArgumentError("`nothing` can not be interpolated into commands (`Cmd`)"))
arg_gen() = String[]
arg_gen(x::AbstractString) = String[cstr(x)]
function arg_gen(cmd::Cmd)
if has_nondefault_cmd_flags(cmd)
throw(ArgumentError("Non-default environment behavior is only permitted for the first interpolant."))
end
cmd.exec
end
function arg_gen(head)
if isiterable(typeof(head))
vals = String[]
for x in head
push!(vals, cmd_interpolate(x))
end
return vals
else
return String[cmd_interpolate(head)]
end
end
function arg_gen(head, tail...)
head = arg_gen(head)
tail = arg_gen(tail...)
vals = String[]
for h = head, t = tail
push!(vals, cmd_interpolate(h,t))
end
return vals
end
function cmd_gen(parsed)
args = String[]
if length(parsed) >= 1 && isa(parsed[1], Tuple{Cmd})
cmd = (parsed[1]::Tuple{Cmd})[1]
(ignorestatus, flags, env, dir) = (cmd.ignorestatus, cmd.flags, cmd.env, cmd.dir)
append!(args, cmd.exec)
for arg in tail(parsed)
append!(args, arg_gen(arg...)::Vector{String})
end
return Cmd(Cmd(args), ignorestatus, flags, env, dir)
else
for arg in parsed
append!(args, arg_gen(arg...)::Vector{String})
end
return Cmd(args)
end
end
"""
@cmd str
Similar to `cmd`, generate a `Cmd` from the `str` string which represents the shell command(s) to be executed.
The [`Cmd`](@ref) object can be run as a process and can outlive the spawning julia process (see `Cmd` for more).
# Examples
```jldoctest
julia> cm = @cmd " echo 1 "
`echo 1`
julia> run(cm)
1
Process(`echo 1`, ProcessExited(0))
```
"""
macro cmd(str)
cmd_ex = shell_parse(str, special=shell_special, filename=String(__source__.file))[1]
return :(cmd_gen($(esc(cmd_ex))))
end
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