wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-06-26 15:51:15 +02:00
Code Activity

Add builtins.getContext.

Browse source 
This can be very helpful when debugging, as well as enabling complex
black magic like surgically removing a single dependency from a
string's context.
This commit is contained in:
Shea Levy 2019-01-13 12:43:46 -05:00
parent 087be7281a
commit 1d757292d0
No known key found for this signature in database
GPG key ID: 5C0BD6957D86FE27
5 changed files with 158 additions and 38 deletions
Download patch file Download diff file Expand all files Collapse all files

38
src/libexpr/primops.cc
View file

@ -1780,41 +1780,6 @@ static void prim_stringLength(EvalState & state, const Pos & pos, Value * * args
}
static void prim_unsafeDiscardStringContext(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
PathSet context;
string s = state.coerceToString(pos, *args[0], context);
mkString(v, s, PathSet());
}
static void prim_hasContext(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
PathSet context;
state.forceString(*args[0], context, pos);
mkBool(v, !context.empty());
}
/* Sometimes we want to pass a derivation path (i.e. pkg.drvPath) to a
builder without causing the derivation to be built (for instance,
in the derivation that builds NARs in nix-push, when doing
source-only deployment). This primop marks the string context so
that builtins.derivation adds the path to drv.inputSrcs rather than
drv.inputDrvs. */
static void prim_unsafeDiscardOutputDependency(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
PathSet context;
string s = state.coerceToString(pos, *args[0], context);
PathSet context2;
for (auto & p : context)
context2.insert(p.at(0) == '=' ? string(p, 1) : p);
mkString(v, s, context2);
}
/* Return the cryptographic hash of a string in base-16. */
static void prim_hashString(EvalState & state, const Pos & pos, Value * * args, Value & v)
{
@ -2285,9 +2250,6 @@ void EvalState::createBaseEnv()
addPrimOp("toString", 1, prim_toString);
addPrimOp("__substring", 3, prim_substring);
addPrimOp("__stringLength", 1, prim_stringLength);
addPrimOp("__hasContext", 1, prim_hasContext);
addPrimOp("__unsafeDiscardStringContext", 1, prim_unsafeDiscardStringContext);
addPrimOp("__unsafeDiscardOutputDependency", 1, prim_unsafeDiscardOutputDependency);
addPrimOp("__hashString", 2, prim_hashString);
addPrimOp("__match", 2, prim_match);
addPrimOp("__split", 2, prim_split);