feat(users/Profpatsch/lib): add eprint-stdin-netencode r/2545

Like `eprint-stdin`, but reads stdin as netencode and pretty-prints it
to stderr.

Change-Id: I430c010b0cac45f077cde9dadfd79adfa7a53eca
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2533
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

2 files changed, 17 insertions, 3 deletions

diff --git a/users/Profpatsch/lib.nix b/users/Profpatsch/lib.nix
index db81c2dfe321..1e9652a27986 100644
--- a/users/Profpatsch/lib.nix
+++ b/users/Profpatsch/lib.nix
@@ -21,6 +21,19 @@ let
     "pipeline" [ bins.multitee "0-1,2" ] "$@"
   ];
 
+  eprint-stdin-netencode = depot.nix.writeExecline "eprint-stdin-netencode" {} [
+    "pipeline" [
+      # move stdout to 3
+      "fdmove" "3" "1"
+      # the multitee copies stdin to 1 (the other pipeline end) and 3 (the stdout of the outer pipeline block)
+      "pipeline" [ bins.multitee "0-1,3" ]
+      # make stderr the stdout of pretty, merging with the stderr of pretty
+      "fdmove" "-c" "1" "2"
+      depot.users.Profpatsch.netencode.pretty
+    ]
+    "$@"
+  ];
+
   eprintenv = depot.nix.writeExecline "eprintenv" { readNArgs = 1; } [
     "ifelse" [ "fdmove" "-c" "1" "2" bins.printenv "$1" ]
     [ "$@" ]
@@ -43,6 +56,7 @@ in {
     debugExec
     eprintf
     eprint-stdin
+    eprint-stdin-netencode
     eprintenv
     runInEmptyEnv
     ;
diff --git a/users/Profpatsch/netencode/default.nix b/users/Profpatsch/netencode/default.nix
index 843408941d82..33209276f92f 100644
--- a/users/Profpatsch/netencode/default.nix
+++ b/users/Profpatsch/netencode/default.nix
@@ -38,12 +38,12 @@ let
     extern crate exec_helpers;
 
     fn main() {
-      let (_, prog) = exec_helpers::args_for_exec("eprint-stdin-netencode", 0);
+      let (_, prog) = exec_helpers::args_for_exec("netencode-pretty", 0);
       let mut buf = vec![];
-      let u = netencode::u_from_stdin_or_die_user_error("eprint-stdin-netencode", &mut buf);
+      let u = netencode::u_from_stdin_or_die_user_error("netencode-pretty", &mut buf);
       match netencode_pretty::Pretty::from_u(u).print_multiline(&mut std::io::stdout()) {
         Ok(()) => {},
-        Err(err) => exec_helpers::die_temporary("eprint-stdin-netencode", format!("could not write to stdout: {}", err))
+        Err(err) => exec_helpers::die_temporary("netencode-pretty", format!("could not write to stdout: {}", err))
       }
     }
   '';