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authorLudovic Courtès <ludo@gnu.org>2021-04-06 12:10:29 +0200
committerLudovic Courtès <ludo@gnu.org>2021-04-09 17:46:38 +0200
commit2d73086262e1fb33cd0f0f16f74a495fe06b38aa (patch)
tree4811dc7447842b834517ac1bf42127f897197428 /nix/libstore/local-store.cc
parentccff3380867b588f0c68e9daedd5728392a91a3f (diff)
daemon: 'guix substitute' replies on FD 4.
This avoids the situation where error messages would unintentionally go to stderr and be wrongfully interpreted as a reply by the daemon. Fixes <https://bugs.gnu.org/46362>. This is a followup to ee3226e9d54891c7e696912245e4904435be191c. * guix/scripts/substitute.scm (display-narinfo-data): Add 'port' parameter and honor it. (process-query): Likewise. (process-substitution): Likewise. (%error-to-file-descriptor-4?, with-redirected-error-port): Remove. (%reply-file-descriptor): New variable. (guix-substitute): Remove use of 'with-redirected-error-port'. Define 'reply-port' and pass it to 'process-query' and 'process-substitution'. * nix/libstore/build.cc (SubstitutionGoal::handleChildOutput): Swap 'builderOut' and 'fromAgent'. * nix/libstore/local-store.cc (LocalStore::getLineFromSubstituter): Likewise. * tests/substitute.scm <top level>: Set '%reply-file-descriptor' rather than '%error-to-file-descriptor-4?'.
Diffstat (limited to 'nix/libstore/local-store.cc')
-rw-r--r--nix/libstore/local-store.cc12
1 files changed, 6 insertions, 6 deletions
diff --git a/nix/libstore/local-store.cc b/nix/libstore/local-store.cc
index c304e2ddd1..675d1ba66f 100644
--- a/nix/libstore/local-store.cc
+++ b/nix/libstore/local-store.cc
@@ -780,8 +780,8 @@ Path LocalStore::queryPathFromHashPart(const string & hashPart)
});
}
-/* Read a line from the substituter's stdout, while also processing
- its stderr. */
+/* Read a line from the substituter's reply file descriptor, while also
+ processing its stderr. */
string LocalStore::getLineFromSubstituter(Agent & run)
{
string res, err;
@@ -802,9 +802,9 @@ string LocalStore::getLineFromSubstituter(Agent & run)
}
/* Completely drain stderr before dealing with stdout. */
- if (FD_ISSET(run.builderOut.readSide, &fds)) {
+ if (FD_ISSET(run.fromAgent.readSide, &fds)) {
char buf[4096];
- ssize_t n = read(run.builderOut.readSide, (unsigned char *) buf, sizeof(buf));
+ ssize_t n = read(run.fromAgent.readSide, (unsigned char *) buf, sizeof(buf));
if (n == -1) {
if (errno == EINTR) continue;
throw SysError("reading from substituter's stderr");
@@ -822,9 +822,9 @@ string LocalStore::getLineFromSubstituter(Agent & run)
}
/* Read from stdout until we get a newline or the buffer is empty. */
- else if (FD_ISSET(run.fromAgent.readSide, &fds)) {
+ else if (FD_ISSET(run.builderOut.readSide, &fds)) {
unsigned char c;
- readFull(run.fromAgent.readSide, (unsigned char *) &c, 1);
+ readFull(run.builderOut.readSide, (unsigned char *) &c, 1);
if (c == '\n') {
if (!err.empty()) printMsg(lvlError, "substitute: " + err);
return res;