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docs(users/Profpatsch/lib): move split-stdin to lib & document

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Change-Id: I39e81ed766cb209ded5309ea962a59a6f1c811c9
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3285
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>
This commit is contained in:
Profpatsch 2021-08-07 19:37:54 +02:00
parent 4e2879282d
commit 2835e5ec7e
2 changed files with 24 additions and 7 deletions
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6
users/Profpatsch/blog/default.nix
View file

@ -162,11 +162,6 @@ let
''
];
split-stdin = depot.nix.writeExecline "split-stdin" { argMode = "env"; } [
"pipeline" [ "runblock" "1" bins.bash "-c" ''${bins.tee} >("$@")'' "bash-split-stdin" ]
"runblock" "-r" "1"
];
capture-stdin = depot.nix.writers.rustSimple {
name = "capture-stdin";
dependencies = [ depot.users.Profpatsch.execline.exec-helpers ];
@ -231,7 +226,6 @@ in depot.nix.utils.drvTargets {
inherit
router
notes-server
split-stdin
index
router-lookup
;

25
users/Profpatsch/lib.nix
View file

@ -1,9 +1,11 @@
{ depot, pkgs, ... }:
let
bins = depot.nix.getBins pkgs.coreutils [ "printf" "echo" "cat" "printenv" ]
bins = depot.nix.getBins pkgs.coreutils [ "printf" "echo" "cat" "printenv" "tee" ]
// depot.nix.getBins pkgs.bash [ "bash" ]
// depot.nix.getBins pkgs.fdtools [ "multitee" ]
;
# Print `msg` and and argv to stderr, then execute into argv
debugExec = msg: depot.nix.writeExecline "debug-exec" {} [
"if" [
"fdmove" "-c" "1" "2"
@ -13,10 +15,12 @@ let
"$@"
];
# Print stdin to stderr and stdout
eprint-stdin = depot.nix.writeExecline "eprint-stdin" {} [
"pipeline" [ bins.multitee "0-1,2" ] "$@"
];
# Assume the input on stdin is netencode, pretty print it to stderr and forward it to stdout
eprint-stdin-netencode = depot.nix.writeExecline "eprint-stdin-netencode" {} [
"pipeline" [
# move stdout to 3
@ -30,6 +34,7 @@ let
"$@"
];
# print the given environment variable in $1 to stderr, then execute into the rest of argv
eprintenv = depot.nix.writeExecline "eprintenv" { readNArgs = 1; } [
"ifelse" [ "fdmove" "-c" "1" "2" bins.printenv "$1" ]
[ "$@" ]
@ -37,6 +42,23 @@ let
"$@"
];
# Split stdin into two commands, given by a block and the rest of argv
#
# Example (execline):
#
# pipeline [ echo foo ]
# split-stdin [ fdmove 1 2 foreground [ cat ] echo "bar" ] cat
#
# stdout: foo\n
# stderr: foo\nbar\n
split-stdin = depot.nix.writeExecline "split-stdin" { argMode = "env"; } [
"pipeline" [
# this is horrible yes but the quickest way I knew how to implement it
"runblock" "1" bins.bash "-c" ''${bins.tee} >("$@")'' "bash-split-stdin"
]
"runblock" "-r" "1"
];
# remove everything but a few selected environment variables
runInEmptyEnv = keepVars:
let
@ -53,6 +75,7 @@ in {
eprint-stdin
eprint-stdin-netencode
eprintenv
split-stdin
runInEmptyEnv
;
}