spacefrogg
/
nixredo
1
0
Fork 0
Code Releases Activity

handle simultaneous writes to stdout and $3

master
Michael Raitza 2021-02-17 09:12:23 +01:00
parent dd8952be85
commit 696271700a
1 changed files with 21 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
builder.nix
View File

@ -14,15 +14,27 @@ let
# Funktionalise pkgs; our main entry point to resolve default*nix build scripts. # Funktionalise pkgs; our main entry point to resolve default*nix build scripts.
funcPkgs = { __functor = self: arg: resolve arg; } // pkgs; funcPkgs = { __functor = self: arg: resolve arg; } // pkgs;
_builder = if (tryEval (let _builder = let
imported = (tryEval (let
# Needs to be done as nix chokes on empty files rn. # Needs to be done as nix chokes on empty files rn.
content = readFile builder; content = readFile builder;
in assert content != "" && (! (hasPrefix "#!" content)); import builder)).success in assert content != "" && (! (hasPrefix "#!" content)); import builder));
then import builder in if imported.success
else '' then imported.value
else {
builder = ''
#!/bin/sh #!/bin/sh
${/. + builder} $d1 $d2 $out >$out set -e
pout=$(mktemp -u -p $PWD)
${/. + builder} $d1 $d2 $out >$pout
if [ -e $out -a -s $pout ]; then
printf "Error: %s wrote to stdout and created \$3\n" "$d1" >&2
exit 207
elif [ -s $pout ]; then
mv $pout $out
fi
''; '';
};
__builder = if isFunction _builder then _builder funcPkgs __builder = if isFunction _builder then _builder funcPkgs
else _builder; else _builder;