Merge pull request #2779 from LnL7/build-exit-codes

build: add exit code for hash and check mismatches

6 files changed, 111 insertions, 12 deletions

diff --git a/doc/manual/command-ref/nix-store.xml b/doc/manual/command-ref/nix-store.xml
index 625598310ff7..113a3c2e41ed 100644
--- a/doc/manual/command-ref/nix-store.xml
+++ b/doc/manual/command-ref/nix-store.xml
@@ -215,6 +215,48 @@ printed.)</para>
 
 </variablelist>
 
+<para>Special exit codes:</para>
+
+<variablelist>
+
+  <varlistentry><term><literal>100</literal></term>
+    <listitem><para>Generic build failure, the builder process
+    returned with a non-zero exit code.</para></listitem>
+  </varlistentry>
+
+  <varlistentry><term><literal>101</literal></term>
+    <listitem><para>Build timeout, the build was aborted because it
+    did not complete within the specified <link
+    linkend='conf-timeout'><literal>timeout</literal></link>.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry><term><literal>102</literal></term>
+    <listitem><para>Hash mismatch, the build output was rejected
+    because it does not match the specified <link
+    linkend="fixed-output-drvs"><varname>outputHash</varname></link>.
+    </para></listitem>
+  </varlistentry>
+
+  <varlistentry><term><literal>104</literal></term>
+    <listitem><para>Not deterministic, the build succeeded in check
+    mode but the resulting output is not binary reproducable.</para>
+    </listitem>
+  </varlistentry>
+
+</variablelist>
+
+<para>With the <option>--keep-going</option> flag it's possible for
+multiple failures to occur, in this case the 1xx status codes are or combined
+using binary or. <screen>
+1100100
+   ^^^^
+   |||`- timeout
+   ||`-- output hash mismatch
+   |`--- build failure
+   `---- not deterministic
+</screen></para>
+
 </refsection>
 
 
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 5b38bcf3c5ec..350ac4092854 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -266,6 +266,12 @@ public:
     /* Set if at least one derivation had a timeout. */
     bool timedOut;
 
+    /* Set if at least one derivation fails with a hash mismatch. */
+    bool hashMismatch;
+
+    /* Set if at least one derivation is not deterministic in check mode. */
+    bool checkMismatch;
+
     LocalStore & store;
 
     std::unique_ptr<HookInstance> hook;
@@ -3213,6 +3219,7 @@ void DerivationGoal::registerOutputs()
 
                 /* Throw an error after registering the path as
                    valid. */
+                worker.hashMismatch = true;
                 delayedException = std::make_exception_ptr(
                     BuildError("hash mismatch in fixed-output derivation '%s':\n  wanted: %s\n  got:    %s",
                         dest, h.to_string(), h2.to_string()));
@@ -3255,6 +3262,7 @@ void DerivationGoal::registerOutputs()
             if (!worker.store.isValidPath(path)) continue;
             auto info = *worker.store.queryPathInfo(path);
             if (hash.first != info.narHash) {
+                worker.checkMismatch = true;
                 if (settings.runDiffHook || settings.keepFailed) {
                     Path dst = worker.store.toRealPath(path + checkSuffix);
                     deletePath(dst);
@@ -3266,10 +3274,10 @@ void DerivationGoal::registerOutputs()
                         buildUser ? buildUser->getGID() : getgid(),
                         path, dst, drvPath, tmpDir);
 
-                    throw Error(format("derivation '%1%' may not be deterministic: output '%2%' differs from '%3%'")
+                    throw NotDeterministic(format("derivation '%1%' may not be deterministic: output '%2%' differs from '%3%'")
                         % drvPath % path % dst);
                 } else
-                    throw Error(format("derivation '%1%' may not be deterministic: output '%2%' differs")
+                    throw NotDeterministic(format("derivation '%1%' may not be deterministic: output '%2%' differs")
                         % drvPath % path);
             }
 
@@ -4101,6 +4109,8 @@ Worker::Worker(LocalStore & store)
     lastWokenUp = steady_time_point::min();
     permanentFailure = false;
     timedOut = false;
+    hashMismatch = false;
+    checkMismatch = false;
 }
 
 
@@ -4461,7 +4471,29 @@ void Worker::waitForInput()
 
 unsigned int Worker::exitStatus()
 {
-    return timedOut ? 101 : (permanentFailure ? 100 : 1);
+    /*
+     * 1100100
+     *    ^^^^
+     *    |||`- timeout
+     *    ||`-- output hash mismatch
+     *    |`--- build failure
+     *    `---- not deterministic
+     */
+    unsigned int mask = 0;
+    bool buildFailure = permanentFailure || timedOut || hashMismatch;
+    if (buildFailure)
+        mask |= 0x04;  // 100
+    if (timedOut)
+        mask |= 0x01;  // 101
+    if (hashMismatch)
+        mask |= 0x02;  // 102
+    if (checkMismatch) {
+        mask |= 0x08;  // 104
+    }
+
+    if (mask)
+        mask |= 0x60;
+    return mask ? mask : 1;
 }
 
 
diff --git a/src/libstore/download.cc b/src/libstore/download.cc
index 0c5a73ea3c51..7a2af237ee8f 100644
--- a/src/libstore/download.cc
+++ b/src/libstore/download.cc
@@ -855,10 +855,11 @@ CachedDownloadResult Downloader::downloadCached(
     }
 
     if (expectedStorePath != "" && storePath != expectedStorePath) {
+        unsigned int statusCode = 102;
         Hash gotHash = request.unpack
             ? hashPath(request.expectedHash.type, store->toRealPath(storePath)).first
             : hashFile(request.expectedHash.type, store->toRealPath(storePath));
-        throw nix::Error("hash mismatch in file downloaded from '%s':\n  wanted: %s\n  got:    %s",
+        throw nix::Error(statusCode, "hash mismatch in file downloaded from '%s':\n  wanted: %s\n  got:    %s",
             url, request.expectedHash.to_string(), gotHash.to_string());
     }
 
diff --git a/tests/check.nix b/tests/check.nix
index 08aac2fb0a77..56c82e565a8f 100644
--- a/tests/check.nix
+++ b/tests/check.nix
@@ -10,6 +10,11 @@ with import ./config.nix;
       '';
   };
 
+  hashmismatch = import <nix/fetchurl.nix> {
+    url = "file://" + toString ./dummy;
+    sha256 = "0mdqa9w1p6cmli6976v4wi0sw9r4p5prkj7lzfd1877wk11c9c73";
+  };
+
   fetchurl = import <nix/fetchurl.nix> {
     url = "file://" + toString ./lang/eval-okay-xml.exp.xml;
     sha256 = "0kg4sla7ihm8ijr8cb3117fhl99zrc2bwy1jrngsfmkh8bav4m0v";
diff --git a/tests/check.sh b/tests/check.sh
index b05e40ffbeea..bc23a6634ca0 100644
--- a/tests/check.sh
+++ b/tests/check.sh
@@ -6,14 +6,16 @@ nix-build dependencies.nix --no-out-link
 nix-build dependencies.nix --no-out-link --check
 
 nix-build check.nix -A nondeterministic --no-out-link
-(! nix-build check.nix -A nondeterministic --no-out-link --check 2> $TEST_ROOT/log)
+nix-build check.nix -A nondeterministic --no-out-link --check 2> $TEST_ROOT/log || status=$?
 grep 'may not be deterministic' $TEST_ROOT/log
+[ "$status" = "104" ]
 
 clearStore
 
 nix-build dependencies.nix --no-out-link --repeat 3
 
-(! nix-build check.nix -A nondeterministic --no-out-link --repeat 1 2> $TEST_ROOT/log)
+nix-build check.nix -A nondeterministic --no-out-link --repeat 1 2> $TEST_ROOT/log || status=$?
+[ "$status" = "1" ]
 grep 'differs from previous round' $TEST_ROOT/log
 
 path=$(nix-build check.nix -A fetchurl --no-out-link --hashed-mirrors '')
@@ -23,10 +25,23 @@ echo foo > $path
 chmod -w $path
 
 nix-build check.nix -A fetchurl --no-out-link --check --hashed-mirrors ''
-
 # Note: "check" doesn't repair anything, it just compares to the hash stored in the database.
 [[ $(cat $path) = foo ]]
 
 nix-build check.nix -A fetchurl --no-out-link --repair --hashed-mirrors ''
-
 [[ $(cat $path) != foo ]]
+
+nix-build check.nix -A hashmismatch --no-out-link --hashed-mirrors '' || status=$?
+[ "$status" = "102" ]
+
+echo -n > ./dummy
+nix-build check.nix -A hashmismatch --no-out-link --hashed-mirrors ''
+echo 'Hello World' > ./dummy
+
+nix-build check.nix -A hashmismatch --no-out-link --check --hashed-mirrors '' || status=$?
+[ "$status" = "102" ]
+
+# Multiple failures with --keep-going
+nix-build check.nix -A nondeterministic --no-out-link
+nix-build check.nix -A nondeterministic -A hashmismatch --no-out-link --check --keep-going --hashed-mirrors '' || status=$?
+[ "$status" = "110" ]
diff --git a/tests/timeout.sh b/tests/timeout.sh
index 39ecf0a1a30c..eea9b5731da0 100644
--- a/tests/timeout.sh
+++ b/tests/timeout.sh
@@ -2,10 +2,14 @@
 
 source common.sh
 
-failed=0
-messages="`nix-build -Q timeout.nix -A infiniteLoop --timeout 2 2>&1 || failed=1`"
-if [ $failed -ne 0 ]; then
-    echo "error: 'nix-store' succeeded; should have timed out"
+
+set +e
+messages=$(nix-build -Q timeout.nix -A infiniteLoop --timeout 2 2>&1)
+status=$?
+set -e
+
+if [ $status -ne 101 ]; then
+    echo "error: 'nix-store' exited with '$status'; should have exited 101"
     exit 1
 fi