Merge remote-tracking branch 'origin/master' into flakes

doc/manual/command-ref/conf-file.xml

@@ -433,7 +433,7 @@ builtins.fetchurl {
   <varlistentry xml:id="conf-keep-env-derivations"><term><literal>keep-env-derivations</literal></term>
 
     <listitem><para>If <literal>false</literal> (default), derivations
-    are not stored in Nix user environments.  That is, the derivation
+    are not stored in Nix user environments.  That is, the derivations of
     any build-time-only dependencies may be garbage-collected.</para>
 
     <para>If <literal>true</literal>, when you add a Nix derivation to

doc/manual/command-ref/nix-env.xml

@@ -659,7 +659,7 @@ upgrading `mozilla-1.2' to `mozilla-1.4'</screen>
 <literal>gcc-3.3.1</literal> are split into two parts: the package
 name (<literal>gcc</literal>), and the version
 (<literal>3.3.1</literal>).  The version part starts after the first
-dash not following by a letter.  <varname>x</varname> is considered an
+dash not followed by a letter.  <varname>x</varname> is considered an
 upgrade of <varname>y</varname> if their package names match, and the
 version of <varname>y</varname> is higher that that of
 <varname>x</varname>.</para>

doc/manual/command-ref/nix-prefetch-url.xml

@@ -53,7 +53,7 @@ avoided.</para>
 <para>If <replaceable>hash</replaceable> is specified, then a download
 is not performed if the Nix store already contains a file with the
 same hash and base name.  Otherwise, the file is downloaded, and an
-error if signaled if the actual hash of the file does not match the
+error is signaled if the actual hash of the file does not match the
 specified hash.</para>
 
 <para>This command prints the hash on standard output.  Additionally,

doc/manual/expressions/builtins.xml

@@ -289,7 +289,7 @@ if builtins ? getEnv then builtins.getEnv "PATH" else ""</programlisting>
 
     <listitem><para>Return element <replaceable>n</replaceable> from
     the list <replaceable>xs</replaceable>.  Elements are counted
-    starting from 0.  A fatal error occurs in the index is out of
+    starting from 0.  A fatal error occurs if the index is out of
     bounds.</para></listitem>
 
   </varlistentry>
@@ -1466,7 +1466,7 @@ in foo</programlisting>
       <listitem><para>A set containing <literal>{ __toString = self: ...; }</literal>.</para></listitem>
       <listitem><para>An integer.</para></listitem>
       <listitem><para>A list, in which case the string representations of its elements are joined with spaces.</para></listitem>
-      <listitem><para>A Boolean (<literal>false</literal> yields <literal>""</literal>, <literal>true</literal> yields <literal>"1"</literal>.</para></listitem>
+      <listitem><para>A Boolean (<literal>false</literal> yields <literal>""</literal>, <literal>true</literal> yields <literal>"1"</literal>).</para></listitem>
       <listitem><para><literal>null</literal>, which yields the empty string.</para></listitem>
     </itemizedlist>
     </listitem>

doc/manual/expressions/simple-building-testing.xml

@@ -43,7 +43,7 @@ use <command>nix-build</command>’s <option
 linkend='opt-out-link'>-o</option> switch to give the symlink another
 name.</para>
 
-<para>Nix has a transactional semantics.  Once a build finishes
+<para>Nix has transactional semantics.  Once a build finishes
 successfully, Nix makes a note of this in its database: it registers
 that the path denoted by <envar>out</envar> is now
 <quote>valid</quote>.  If you try to build the derivation again, Nix

misc/launchd/org.nixos.nix-daemon.plist.in

@@ -17,7 +17,7 @@
     <array>
       <string>/bin/sh</string>
       <string>-c</string>
-      <string>/bin/wait4path @bindir@/nix-daemon &amp;&amp; @bindir@/nix-daemon</string>
+      <string>/bin/wait4path /nix/var/nix/profiles/default/bin/nix-daemon &amp;&amp; /nix/var/nix/profiles/default/bin/nix-daemon</string>
     </array>
     <key>StandardErrorPath</key>
     <string>/var/log/nix-daemon.log</string>

nix.spec.in

@@ -106,7 +106,7 @@ chmod 1775 $RPM_BUILD_ROOT/nix/store
 for d in profiles gcroots;
 do
   mkdir -p $RPM_BUILD_ROOT/nix/var/nix/$d/per-user
-  chmod 1777 $RPM_BUILD_ROOT/nix/var/nix/$d/per-user
+  chmod 755 $RPM_BUILD_ROOT/nix/var/nix/$d/per-user
 done
 
 # fix permission of nix profile

scripts/install-darwin-multi-user.sh

@@ -39,7 +39,7 @@ EOF
 
 poly_configure_nix_daemon_service() {
     _sudo "to set up the nix-daemon as a LaunchDaemon" \
-          ln -sfn "/nix/var/nix/profiles/default$PLIST_DEST" "$PLIST_DEST"
+          cp -f "/nix/var/nix/profiles/default$PLIST_DEST" "$PLIST_DEST"
 
     _sudo "to load the LaunchDaemon plist for nix-daemon" \
           launchctl load /Library/LaunchDaemons/org.nixos.nix-daemon.plist

scripts/install-multi-user.sh

@@ -278,73 +278,9 @@ EOF
     fi
 
     if type nix-env 2> /dev/null >&2; then
-        failure <<EOF
+        warning <<EOF
-Nix already appears to be installed, and this tool assumes it is
+Nix already appears to be installed. This installer may run into issues.
-_not_ yet installed.
+If an error occurs, try manually uninstalling, then rerunning this script.
-
-$(uninstall_directions)
-EOF
-    fi
-
-    if [ "${NIX_REMOTE:-}" != "" ]; then
-        failure <<EOF
-For some reason, \$NIX_REMOTE is set. It really should not be set
-before this installer runs, and it hints that Nix is currently
-installed. Please delete the old Nix installation and start again.
-
-Note: You might need to close your shell window and open a new shell
-to clear the variable.
-EOF
-    fi
-
-    if echo "${SSL_CERT_FILE:-}" | grep -qE "(nix/var/nix|nix-profile)"; then
-        failure <<EOF
-It looks like \$SSL_CERT_FILE is set to a path that used to be part of
-the old Nix installation. Please unset that variable and try again:
-
-  $ unset SSL_CERT_FILE
-
-EOF
-    fi
-
-    for file in ~/.bash_profile ~/.bash_login ~/.profile ~/.zshenv ~/.zprofile ~/.zshrc ~/.zlogin; do
-        if [ -f "$file" ]; then
-            if grep -l "^[^#].*.nix-profile" "$file"; then
-                failure <<EOF
-I found a reference to a ".nix-profile" in $file.
-This has a high chance of breaking a new nix installation. It was most
-likely put there by a previous Nix installer.
-
-Please remove this reference and try running this again. You should
-also look for similar references in:
-
- - ~/.bash_profile
- - ~/.bash_login
- - ~/.profile
-
-or other shell init files that you may have.
-
-$(uninstall_directions)
-EOF
-            fi
-        fi
-    done
-
-    if [ -d /nix/store ] || [ -d /nix/var ]; then
-        failure <<EOF
-There are some relics of a previous installation of Nix at /nix, and
-this scripts assumes Nix is _not_ yet installed. Please delete the old
-Nix installation and start again.
-
-$(uninstall_directions)
-EOF
-    fi
-
-    if [ -d /etc/nix ]; then
-        failure <<EOF
-There are some relics of a previous installation of Nix at /etc/nix, and
-this scripts assumes Nix is _not_ yet installed. Please delete the old
-Nix installation and start again.
 
 $(uninstall_directions)
 EOF
@@ -364,38 +300,10 @@ in case.
 2. Take care to make sure that $profile_target$PROFILE_BACKUP_SUFFIX doesn't look like
 it has anything nix-related in it. If it does, something is probably
 quite wrong. Please open an issue or get in touch immediately.
-
-3. Take care to make sure that $profile_target doesn't look like it has
-anything nix-related in it. If it does, and $profile_target _did not_,
-run:
-
-  $ /usr/bin/sudo /bin/mv $profile_target$PROFILE_BACKUP_SUFFIX $profile_target
-
-and try again.
-EOF
-        fi
-
-        if [ -e "$profile_target" ] && grep -qi "nix" "$profile_target"; then
-            failure <<EOF
-It looks like $profile_target already has some Nix configuration in
-there. There should be no reason to run this again. If you're having
-trouble, please open an issue.
 EOF
         fi
     done
 
-    danger_paths=("$ROOT_HOME/.nix-defexpr" "$ROOT_HOME/.nix-channels" "$ROOT_HOME/.nix-profile")
-    for danger_path in "${danger_paths[@]}"; do
-        if _sudo "making sure that $danger_path doesn't exist" \
-           test -e "$danger_path"; then
-            failure <<EOF
-I found a file at $danger_path, which is a relic of a previous
-installation. You must first delete this file before continuing.
-
-$(uninstall_directions)
-EOF
-        fi
-    done
 }
 
 setup_report() {
@@ -529,24 +437,17 @@ create_build_users() {
 }
 
 create_directories() {
+    # FIXME: remove all of this because it duplicates LocalStore::LocalStore().
+
     _sudo "to make the basic directory structure of Nix (part 1)" \
-          mkdir -pv -m 0755 /nix /nix/var /nix/var/log /nix/var/log/nix /nix/var/log/nix/drvs /nix/var/nix{,/db,/gcroots,/profiles,/temproots,/userpool}
+          mkdir -pv -m 0755 /nix /nix/var /nix/var/log /nix/var/log/nix /nix/var/log/nix/drvs /nix/var/nix{,/db,/gcroots,/profiles,/temproots,/userpool} /nix/var/nix/{gcroots,profiles}/per-user
 
     _sudo "to make the basic directory structure of Nix (part 2)" \
-          mkdir -pv -m 1777 /nix/var/nix/{gcroots,profiles}/per-user
-
-    _sudo "to make the basic directory structure of Nix (part 3)" \
           mkdir -pv -m 1775 /nix/store
 
-    _sudo "to make the basic directory structure of Nix (part 4)" \
+    _sudo "to make the basic directory structure of Nix (part 3)" \
           chgrp "$NIX_BUILD_GROUP_NAME" /nix/store
 
-    _sudo "to set up the root user's profile (part 1)" \
-          mkdir -pv -m 0755 /nix/var/nix/profiles/per-user/root
-
-    _sudo "to set up the root user's profile (part 2)" \
-          mkdir -pv -m 0700 "$ROOT_HOME/.nix-defexpr"
-
     _sudo "to place the default nix daemon configuration (part 1)" \
           mkdir -pv -m 0555 /etc/nix
 }
@@ -772,9 +673,7 @@ main() {
     welcome_to_nix
     chat_about_sudo
 
-    if [ "${ALLOW_PREEXISTING_INSTALLATION:-}" = "" ]; then
     validate_starting_assumptions
-    fi
 
     setup_report
 

scripts/nix-profile-daemon.sh.in

@@ -5,45 +5,6 @@ __ETC_PROFILE_NIX_SOURCED=1
 export NIX_USER_PROFILE_DIR="@localstatedir@/nix/profiles/per-user/$USER"
 export NIX_PROFILES="@localstatedir@/nix/profiles/default $HOME/.nix-profile"
 
-# Set up the per-user profile.
-mkdir -m 0755 -p $NIX_USER_PROFILE_DIR
-if ! test -O "$NIX_USER_PROFILE_DIR"; then
-    echo "WARNING: bad ownership on $NIX_USER_PROFILE_DIR" >&2
-fi
-
-if test -w $HOME; then
-  if ! test -L $HOME/.nix-profile; then
-      if test "$USER" != root; then
-          ln -s $NIX_USER_PROFILE_DIR/profile $HOME/.nix-profile
-      else
-          # Root installs in the system-wide profile by default.
-          ln -s @localstatedir@/nix/profiles/default $HOME/.nix-profile
-      fi
-  fi
-
-  # Subscribe the root user to the NixOS channel by default.
-  if [ "$USER" = root -a ! -e $HOME/.nix-channels ]; then
-      echo "https://nixos.org/channels/nixpkgs-unstable nixpkgs" > $HOME/.nix-channels
-  fi
-
-  # Create the per-user garbage collector roots directory.
-  NIX_USER_GCROOTS_DIR=@localstatedir@/nix/gcroots/per-user/$USER
-  mkdir -m 0755 -p $NIX_USER_GCROOTS_DIR
-  if ! test -O "$NIX_USER_GCROOTS_DIR"; then
-      echo "WARNING: bad ownership on $NIX_USER_GCROOTS_DIR" >&2
-  fi
-
-  # Set up a default Nix expression from which to install stuff.
-  if [ ! -e $HOME/.nix-defexpr -o -L $HOME/.nix-defexpr ]; then
-      rm -f $HOME/.nix-defexpr
-      mkdir -p $HOME/.nix-defexpr
-      if [ "$USER" != root ]; then
-          ln -s @localstatedir@/nix/profiles/per-user/root/channels $HOME/.nix-defexpr/channels_root
-      fi
-  fi
-fi
-
-
 # Set $NIX_SSL_CERT_FILE so that Nixpkgs applications like curl work.
 if [ ! -z "${NIX_SSL_CERT_FILE:-}" ]; then
     : # Allow users to override the NIX_SSL_CERT_FILE

scripts/nix-profile.sh.in

@@ -1,6 +1,4 @@
 if [ -n "$HOME" ] && [ -n "$USER" ]; then
-    __savedpath="$PATH"
-    export PATH=@coreutils@
 
     # Set up the per-user profile.
     # This part should be kept in sync with nixpkgs:nixos/modules/programs/shell.nix
@@ -9,48 +7,6 @@ if [ -n "$HOME" ] && [ -n "$USER" ]; then
 
     NIX_USER_PROFILE_DIR=@localstatedir@/nix/profiles/per-user/$USER
 
-    mkdir -m 0755 -p "$NIX_USER_PROFILE_DIR"
-
-    if [ "$(stat --printf '%u' "$NIX_USER_PROFILE_DIR")" != "$(id -u)" ]; then
-        echo "Nix: WARNING: bad ownership on "$NIX_USER_PROFILE_DIR", should be $(id -u)" >&2
-    fi
-
-    if [ -w "$HOME" ]; then
-        if ! [ -L "$NIX_LINK" ]; then
-            echo "Nix: creating $NIX_LINK" >&2
-            if [ "$USER" != root ]; then
-                if ! ln -s "$NIX_USER_PROFILE_DIR"/profile "$NIX_LINK"; then
-                    echo "Nix: WARNING: could not create $NIX_LINK -> $NIX_USER_PROFILE_DIR/profile" >&2
-                fi
-            else
-                # Root installs in the system-wide profile by default.
-                ln -s @localstatedir@/nix/profiles/default "$NIX_LINK"
-            fi
-        fi
-
-        # Subscribe the user to the unstable Nixpkgs channel by default.
-        if [ ! -e "$HOME/.nix-channels" ]; then
-            echo "https://nixos.org/channels/nixpkgs-unstable nixpkgs" > "$HOME/.nix-channels"
-        fi
-
-        # Create the per-user garbage collector roots directory.
-        __user_gcroots=@localstatedir@/nix/gcroots/per-user/"$USER"
-        mkdir -m 0755 -p "$__user_gcroots"
-        if [ "$(stat --printf '%u' "$__user_gcroots")" != "$(id -u)" ]; then
-            echo "Nix: WARNING: bad ownership on $__user_gcroots, should be $(id -u)" >&2
-        fi
-        unset __user_gcroots
-
-        # Set up a default Nix expression from which to install stuff.
-        __nix_defexpr="$HOME"/.nix-defexpr
-        [ -L "$__nix_defexpr" ] && rm -f "$__nix_defexpr"
-        mkdir -m 0755 -p "$__nix_defexpr"
-        if [ "$USER" != root ] && [ ! -L "$__nix_defexpr"/channels_root ]; then
-            ln -s @localstatedir@/nix/profiles/per-user/root/channels "$__nix_defexpr"/channels_root
-        fi
-        unset __nix_defexpr
-    fi
-
     # Append ~/.nix-defexpr/channels to $NIX_PATH so that <nixpkgs>
     # paths work when the user has fetched the Nixpkgs channel.
     export NIX_PATH=${NIX_PATH:+$NIX_PATH:}$HOME/.nix-defexpr/channels
@@ -78,6 +34,6 @@ if [ -n "$HOME" ] && [ -n "$USER" ]; then
         export MANPATH="$NIX_LINK/share/man:$MANPATH"
     fi
 
-    export PATH="$NIX_LINK/bin:$__savedpath"
+    export PATH="$NIX_LINK/bin:$PATH"
-    unset __savedpath NIX_LINK NIX_USER_PROFILE_DIR
+    unset NIX_LINK NIX_USER_PROFILE_DIR
 fi

src/libexpr/eval.cc

@@ -47,11 +47,10 @@ static void printValue(std::ostream & str, std::set<const Value *> & active, con
 {
     checkInterrupt();
 
-    if (active.find(&v) != active.end()) {
+    if (!active.insert(&v).second) {
         str << "<CYCLE>";
         return;
     }
-    active.insert(&v);
 
     switch (v.type) {
     case tInt:
@@ -1486,8 +1485,7 @@ void EvalState::forceValueDeep(Value & v)
     std::function<void(Value & v)> recurse;
 
     recurse = [&](Value & v) {
-        if (seen.find(&v) != seen.end()) return;
+        if (!seen.insert(&v).second) return;
-        seen.insert(&v);
 
         forceValue(v);
 
@@ -1905,8 +1903,7 @@ size_t valueSize(Value & v)
     std::set<const void *> seen;
 
     auto doString = [&](const char * s) -> size_t {
-        if (seen.find(s) != seen.end()) return 0;
+        if (!seen.insert(s).second) return 0;
-        seen.insert(s);
         return strlen(s) + 1;
     };
 
@@ -1914,8 +1911,7 @@ size_t valueSize(Value & v)
     std::function<size_t(Env & v)> doEnv;
 
     doValue = [&](Value & v) -> size_t {
-        if (seen.find(&v) != seen.end()) return 0;
+        if (!seen.insert(&v).second) return 0;
-        seen.insert(&v);
 
         size_t sz = sizeof(Value);
 
@@ -1930,8 +1926,7 @@ size_t valueSize(Value & v)
             sz += doString(v.path);
             break;
         case tAttrs:
-            if (seen.find(v.attrs) == seen.end()) {
+            if (seen.insert(v.attrs).second) {
-                seen.insert(v.attrs);
                 sz += sizeof(Bindings) + sizeof(Attr) * v.attrs->capacity();
                 for (auto & i : *v.attrs)
                     sz += doValue(*i.value);
@@ -1940,8 +1935,7 @@ size_t valueSize(Value & v)
         case tList1:
         case tList2:
         case tListN:
-            if (seen.find(v.listElems()) == seen.end()) {
+            if (seen.insert(v.listElems()).second) {
-                seen.insert(v.listElems());
                 sz += v.listSize() * sizeof(Value *);
                 for (size_t n = 0; n < v.listSize(); ++n)
                     sz += doValue(*v.listElems()[n]);
@@ -1962,8 +1956,7 @@ size_t valueSize(Value & v)
             sz += doValue(*v.primOpApp.right);
             break;
         case tExternal:
-            if (seen.find(v.external) != seen.end()) break;
+            if (!seen.insert(v.external).second) break;
-            seen.insert(v.external);
             sz += v.external->valueSize(seen);
             break;
         default:
@@ -1974,8 +1967,7 @@ size_t valueSize(Value & v)
     };
 
     doEnv = [&](Env & env) -> size_t {
-        if (seen.find(&env) != seen.end()) return 0;
+        if (!seen.insert(&env).second) return 0;
-        seen.insert(&env);
 
         size_t sz = sizeof(Env) + sizeof(Value *) * env.size;
 

src/libexpr/get-drvs.cc

@@ -277,8 +277,7 @@ static bool getDerivation(EvalState & state, Value & v,
 
         /* Remove spurious duplicates (e.g., a set like `rec { x =
            derivation {...}; y = x;}'. */
-        if (done.find(v.attrs) != done.end()) return false;
+        if (!done.insert(v.attrs).second) return false;
-        done.insert(v.attrs);
 
         DrvInfo drv(state, attrPath, v.attrs);
 

src/libexpr/parser.y

@@ -1,5 +1,5 @@
 %glr-parser
-%pure-parser
+%define api.pure
 %locations
 %define parse.error verbose
 %defines
@@ -138,11 +138,10 @@ static void addAttr(ExprAttrs * attrs, AttrPath & attrPath,
 
 static void addFormal(const Pos & pos, Formals * formals, const Formal & formal)
 {
-    if (formals->argNames.find(formal.name) != formals->argNames.end())
+    if (!formals->argNames.insert(formal.name).second)
         throw ParseError(format("duplicate formal function argument '%1%' at %2%")
             % formal.name % pos);
     formals->formals.push_front(formal);
-    formals->argNames.insert(formal.name);
 }
 
 

src/libexpr/primops.cc

@@ -396,8 +396,7 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar
             throw EvalError(format("attribute 'key' required, at %1%") % pos);
         state.forceValue(*key->value);
 
-        if (doneKeys.find(key->value) != doneKeys.end()) continue;
+        if (!doneKeys.insert(key->value).second) continue;
-        doneKeys.insert(key->value);
         res.push_back(e);
 
         /* Call the `operator' function with `e' as argument. */
@@ -1273,13 +1272,12 @@ static void prim_listToAttrs(EvalState & state, const Pos & pos, Value * * args,
         string name = state.forceStringNoCtx(*j->value, pos);
 
         Symbol sym = state.symbols.create(name);
-        if (seen.find(sym) == seen.end()) {
+        if (seen.insert(sym).second) {
             Bindings::iterator j2 = v2.attrs->find(state.symbols.create(state.sValue));
             if (j2 == v2.attrs->end())
                 throw TypeError(format("'value' attribute missing in a call to 'listToAttrs', at %1%") % pos);
 
             v.attrs->push_back(Attr(sym, j2->value, j2->pos));
-            seen.insert(sym);
         }
     }
 

src/libexpr/value-to-xml.cc

@@ -105,10 +105,9 @@ static void printValueAsXML(EvalState & state, bool strict, bool location,
 
                 XMLOpenElement _(doc, "derivation", xmlAttrs);
 
-                if (drvPath != "" && drvsSeen.find(drvPath) == drvsSeen.end()) {
+                if (drvPath != "" && drvsSeen.insert(drvPath).second)
-                    drvsSeen.insert(drvPath);
                     showAttrs(state, strict, location, *v.attrs, doc, context, drvsSeen);
-                } else
+                else
                     doc.writeEmptyElement("repeated");
             }
 

src/libstore/build.cc

@@ -568,10 +568,9 @@ UserLock::UserLock()
 
         {
             auto lockedPaths(lockedPaths_.lock());
-            if (lockedPaths->count(fnUserLock))
+            if (!lockedPaths->insert(fnUserLock).second)
                 /* We already have a lock on this one. */
                 continue;
-            lockedPaths->insert(fnUserLock);
         }
 
         try {
@@ -620,8 +619,8 @@ UserLock::UserLock()
 UserLock::~UserLock()
 {
     auto lockedPaths(lockedPaths_.lock());
-    assert(lockedPaths->count(fnUserLock));
+    auto erased = lockedPaths->erase(fnUserLock);
-    lockedPaths->erase(fnUserLock);
+    assert(erased);
 }
 
 
@@ -1125,11 +1124,9 @@ void DerivationGoal::addWantedOutputs(const StringSet & outputs)
         needRestart = true;
     } else
         for (auto & i : outputs)
-            if (wantedOutputs.find(i) == wantedOutputs.end()) {
+            if (wantedOutputs.insert(i).second)
-                wantedOutputs.insert(i);
                 needRestart = true;
 }
-}
 
 
 void DerivationGoal::getDerivation()

src/libstore/builtins/buildenv.cc

@@ -123,8 +123,7 @@ static Path out;
 
 static void addPkg(const Path & pkgDir, int priority)
 {
-    if (done.count(pkgDir)) return;
+    if (!done.insert(pkgDir).second) return;
-    done.insert(pkgDir);
     createLinks(pkgDir, out, priority);
 
     try {

src/libstore/local-store.cc

@@ -70,15 +70,17 @@ LocalStore::LocalStore(const Params & params)
         createSymlink(profilesDir, gcRootsDir + "/profiles");
     }
 
+    for (auto & perUserDir : {profilesDir + "/per-user", gcRootsDir + "/per-user"}) {
+        createDirs(perUserDir);
+        if (chmod(perUserDir.c_str(), 0755) == -1)
+            throw SysError("could not set permissions on '%s' to 755", perUserDir);
+    }
+
+    createUser(getUserName(), getuid());
+
     /* Optionally, create directories and set permissions for a
        multi-user install. */
     if (getuid() == 0 && settings.buildUsersGroup != "") {
-
-        Path perUserDir = profilesDir + "/per-user";
-        createDirs(perUserDir);
-        if (chmod(perUserDir.c_str(), 01777) == -1)
-            throw SysError(format("could not set permissions on '%1%' to 1777") % perUserDir);
-
         mode_t perm = 01775;
 
         struct group * gr = getgrnam(settings.buildUsersGroup.get().c_str());
@@ -1285,8 +1287,7 @@ void LocalStore::verifyPath(const Path & path, const PathSet & store,
 {
     checkInterrupt();
 
-    if (done.find(path) != done.end()) return;
+    if (!done.insert(path).second) return;
-    done.insert(path);
 
     if (!isStorePath(path)) {
         printError(format("path '%1%' is not in the Nix store") % path);
@@ -1426,4 +1427,19 @@ void LocalStore::signPathInfo(ValidPathInfo & info)
 }
 
 
+void LocalStore::createUser(const std::string & userName, uid_t userId)
+{
+    for (auto & dir : {
+        fmt("%s/profiles/per-user/%s", stateDir, userName),
+        fmt("%s/gcroots/per-user/%s", stateDir, userName)
+    }) {
+        createDirs(dir);
+        if (chmod(dir.c_str(), 0755) == -1)
+            throw SysError("changing permissions of directory '%s'", dir);
+        if (chown(dir.c_str(), userId, getgid()) == -1)
+            throw SysError("changing owner of directory '%s'", dir);
+    }
+}
+
+
 }

src/libstore/local-store.hh

@@ -293,6 +293,8 @@ private:
 
     Path getRealStoreDir() override { return realStoreDir; }
 
+    void createUser(const std::string & userName, uid_t userId) override;
+
     friend class DerivationGoal;
     friend class SubstitutionGoal;
 };

src/libstore/local.mk

@@ -39,9 +39,12 @@ libstore_CXXFLAGS = \
  -DNIX_LIBEXEC_DIR=\"$(libexecdir)\" \
  -DNIX_BIN_DIR=\"$(bindir)\" \
  -DNIX_MAN_DIR=\"$(mandir)\" \
- -DSANDBOX_SHELL="\"$(sandbox_shell)\"" \
  -DLSOF=\"$(lsof)\"
 
+ifneq ($(sandbox_shell),)
+libstore_CXXFLAGS += -DSANDBOX_SHELL="\"$(sandbox_shell)\""
+endif
+
 $(d)/local-store.cc: $(d)/schema.sql.gen.hh
 
 $(d)/build.cc:

src/libstore/misc.cc

@@ -29,8 +29,7 @@ void Store::computeFSClosure(const PathSet & startPaths,
         {
             auto state(state_.lock());
             if (state->exc) return;
-            if (state->paths.count(path)) return;
+            if (!state->paths.insert(path).second) return;
-            state->paths.insert(path);
             state->pending++;
         }
 
@@ -175,8 +174,7 @@ void Store::queryMissing(const PathSet & targets,
 
         {
             auto state(state_.lock());
-            if (state->done.count(path)) return;
+            if (!state->done.insert(path).second) return;
-            state->done.insert(path);
         }
 
         DrvPathWithOutputs i2 = parseDrvPathWithOutputs(path);
@@ -252,8 +250,7 @@ Paths Store::topoSortPaths(const PathSet & paths)
         if (parents.find(path) != parents.end())
             throw BuildError(format("cycle detected in the references of '%1%' from '%2%'") % path % *parent);
 
-        if (visited.find(path) != visited.end()) return;
+        if (!visited.insert(path).second) return;
-        visited.insert(path);
         parents.insert(path);
 
         PathSet references;

src/libstore/references.cc

@@ -36,11 +36,10 @@ static void search(const unsigned char * s, size_t len,
             }
         if (!match) continue;
         string ref((const char *) s + i, refLength);
-        if (hashes.find(ref) != hashes.end()) {
+        if (hashes.erase(ref)) {
             debug(format("found reference to '%1%' at offset '%2%'")
                   % ref % i);
             seen.insert(ref);
-            hashes.erase(ref);
         }
         ++i;
     }

src/libstore/store-api.cc

@@ -949,8 +949,7 @@ std::list<ref<Store>> getDefaultSubstituters()
         StringSet done;
 
         auto addStore = [&](const std::string & uri) {
-            if (done.count(uri)) return;
+            if (!done.insert(uri).second) return;
-            done.insert(uri);
             try {
                 stores.push_back(openStore(uri));
             } catch (Error & e) {

src/libstore/store-api.hh

@@ -629,6 +629,9 @@ public:
         return storePath;
     }
 
+    virtual void createUser(const std::string & userName, uid_t userId)
+    { }
+
 protected:
 
     Stats stats;

src/libutil/json.cc

@@ -171,4 +171,9 @@ JSONObject JSONPlaceholder::object()
     return JSONObject(state);
 }
 
+JSONPlaceholder::~JSONPlaceholder()
+{
+    assert(!first || std::uncaught_exception());
+}
+
 }

src/libutil/json.hh

@@ -168,10 +168,7 @@ public:
     {
     }
 
-    ~JSONPlaceholder()
+    ~JSONPlaceholder();
-    {
-        assert(!first || std::uncaught_exception());
-    }
 
     template<typename T>
     void write(const T & v)

src/libutil/util.cc

@@ -486,6 +486,16 @@ std::pair<AutoCloseFD, Path> createTempFile(const Path & prefix)
 }
 
 
+std::string getUserName()
+{
+    auto pw = getpwuid(geteuid());
+    std::string name = pw ? pw->pw_name : getEnv("USER", "");
+    if (name.empty())
+        throw Error("cannot figure out user name");
+    return name;
+}
+
+
 static Lazy<Path> getHome2([]() {
     Path homeDir = getEnv("HOME");
     if (homeDir.empty()) {

src/libutil/util.hh

@@ -122,6 +122,12 @@ void deletePath(const Path & path);
 
 void deletePath(const Path & path, unsigned long long & bytesFreed);
 
+/* Create a temporary directory. */
+Path createTempDir(const Path & tmpRoot = "", const Path & prefix = "nix",
+    bool includePid = true, bool useGlobalCounter = true, mode_t mode = 0755);
+
+std::string getUserName();
+
 /* Return $HOME or the user's home directory from /etc/passwd. */
 Path getHome();
 

src/nix-build/nix-build.cc

@@ -412,7 +412,7 @@ static void _main(int argc, char * * argv)
         auto rcfile = (Path) tmpDir + "/rc";
         writeFile(rcfile, fmt(
                 (keepTmp ? "" : "rm -rf '%1%'; "s) +
-                "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc; "
+                (pure ? "" : "[ -n \"$PS1\" ] && [ -e ~/.bashrc ] && source ~/.bashrc;") +
                 "%2%"
                 "dontAddDisableDepTrack=1; "
                 "[ -e $stdenv/setup ] && source $stdenv/setup; "

src/nix-channel/nix-channel.cc

@@ -159,13 +159,7 @@ static int _main(int argc, char ** argv)
         nixDefExpr = home + "/.nix-defexpr";
 
         // Figure out the name of the channels profile.
-        ;
+        profile = fmt("%s/profiles/per-user/%s/channels", settings.nixStateDir, getUserName());
-        auto pw = getpwuid(geteuid());
-        std::string name = pw ? pw->pw_name : getEnv("USER", "");
-        if (name.empty())
-            throw Error("cannot figure out user name");
-        profile = settings.nixStateDir + "/profiles/per-user/" + name + "/channels";
-        createDirs(dirOf(profile));
 
         enum {
             cNone,

src/nix-daemon/nix-daemon.cc

@@ -742,7 +742,8 @@ static void performOp(TunnelLogger * logger, ref<Store> store,
 }
 
 
-static void processConnection(bool trusted)
+static void processConnection(bool trusted,
+    const std::string & userName, uid_t userId)
 {
     MonitorFdHup monitor(from.fd);
 
@@ -793,6 +794,8 @@ static void processConnection(bool trusted)
         params["path-info-cache-size"] = "0";
         auto store = openStore(settings.storeUri, params);
 
+        store->createUser(userName, userId);
+
         tunnelLogger->stopWork();
         to.flush();
 
@@ -1053,7 +1056,7 @@ static void daemonLoop(char * * argv)
                 /* Handle the connection. */
                 from.fd = remote.get();
                 to.fd = remote.get();
-                processConnection(trusted);
+                processConnection(trusted, user, peer.uid);
 
                 exit(0);
             }, options);
@@ -1133,7 +1136,7 @@ static int _main(int argc, char * * argv)
                     }
                 }
             } else {
-                processConnection(true);
+                processConnection(true, "root", 0);
             }
         } else {
             daemonLoop(argv);

src/nix-env/nix-env.cc

@@ -124,11 +124,10 @@ static void getAllExprs(EvalState & state,
             string attrName = i;
             if (hasSuffix(attrName, ".nix"))
                 attrName = string(attrName, 0, attrName.size() - 4);
-            if (attrs.find(attrName) != attrs.end()) {
+            if (!attrs.insert(attrName).second) {
                 printError(format("warning: name collision in input Nix expressions, skipping '%1%'") % path2);
                 continue;
             }
-            attrs.insert(attrName);
             /* Load the expression on demand. */
             Value & vFun = state.getBuiltin("import");
             Value & vArg(*state.allocValue());
@@ -193,12 +192,6 @@ static void loadDerivations(EvalState & state, Path nixExprPath,
 }
 
 
-static Path getDefNixExprPath()
-{
-    return getHome() + "/.nix-defexpr";
-}
-
-
 static long getPriority(EvalState & state, DrvInfo & drv)
 {
     return drv.queryMetaInt("priority", 0);
@@ -307,11 +300,9 @@ static DrvInfos filterBySelector(EvalState & state, const DrvInfos & allElems,
         /* Insert only those elements in the final list that we
            haven't inserted before. */
         for (auto & j : matches)
-            if (done.find(j.second) == done.end()) {
+            if (done.insert(j.second).second)
-                done.insert(j.second);
                 elems.push_back(j.first);
     }
-    }
 
     checkSelectorUse(selectors);
 
@@ -1330,9 +1321,22 @@ static int _main(int argc, char * * argv)
         Globals globals;
 
         globals.instSource.type = srcUnknown;
-        globals.instSource.nixExprPath = getDefNixExprPath();
+        globals.instSource.nixExprPath = getHome() + "/.nix-defexpr";
         globals.instSource.systemFilter = "*";
 
+        if (!pathExists(globals.instSource.nixExprPath)) {
+            try {
+                createDirs(globals.instSource.nixExprPath);
+                replaceSymlink(
+                    fmt("%s/profiles/per-user/%s/channels", settings.nixStateDir, getUserName()),
+                    globals.instSource.nixExprPath + "/channels");
+                if (getuid() != 0)
+                    replaceSymlink(
+                        fmt("%s/profiles/per-user/root/channels", settings.nixStateDir),
+                        globals.instSource.nixExprPath + "/channels_root");
+            } catch (Error &) { }
+        }
+
         globals.dryRun = false;
         globals.preserveInstalled = false;
         globals.removeAll = false;
@@ -1425,9 +1429,18 @@ static int _main(int argc, char * * argv)
 
         if (globals.profile == "") {
             Path profileLink = getHome() + "/.nix-profile";
-            globals.profile = pathExists(profileLink)
+            try {
-                ? absPath(readLink(profileLink), dirOf(profileLink))
+                if (!pathExists(profileLink)) {
-                : canonPath(settings.nixStateDir + "/profiles/default");
+                    replaceSymlink(
+                        getuid() == 0
+                        ? settings.nixStateDir + "/profiles/default"
+                        : fmt("%s/profiles/per-user/%s/profile", settings.nixStateDir, getUserName()),
+                        profileLink);
+                }
+                globals.profile = absPath(readLink(profileLink), dirOf(profileLink));
+            } catch (Error &) {
+                globals.profile = profileLink;
+            }
         }
 
         op(globals, opFlags, opArgs);

src/nix-store/dotgraph.cc

@@ -71,9 +71,7 @@ void printClosure(const Path & nePath, const StoreExpr & fs)
         Path path = *(workList.begin());
         workList.erase(path);
 
-        if (doneSet.find(path) == doneSet.end()) {
+        if (doneSet.insert(path).second) {
-            doneSet.insert(path);
-
             ClosureElems::const_iterator elem = fs.closure.elems.find(path);
             if (elem == fs.closure.elems.end())
                 throw Error(format("bad closure, missing path '%1%'") % path);
@@ -104,8 +102,7 @@ void printDotGraph(ref<Store> store, const PathSet & roots)
         Path path = *(workList.begin());
         workList.erase(path);
 
-        if (doneSet.find(path) != doneSet.end()) continue;
+        if (!doneSet.insert(path).second) continue;
-        doneSet.insert(path);
 
         cout << makeNode(path, symbolicName(path), "#ff0000");
 

src/nix-store/nix-store.cc

@@ -242,11 +242,10 @@ const string treeNull = "    ";
 static void printTree(const Path & path,
     const string & firstPad, const string & tailPad, PathSet & done)
 {
-    if (done.find(path) != done.end()) {
+    if (!done.insert(path).second) {
         cout << format("%1%%2% [...]\n") % firstPad % path;
         return;
     }
-    done.insert(path);
 
     cout << format("%1%%2%\n") % firstPad % path;
 

src/nix/progress-bar.cc

@@ -120,7 +120,7 @@ public:
     void log(State & state, Verbosity lvl, const std::string & s)
     {
         if (state.active) {
-            writeToStderr("\r\e[K" + s + ANSI_NORMAL "\n");
+            writeToStderr("\r\e[K" + filterANSIEscapes(s, !isTTY) + ANSI_NORMAL "\n");
             draw(state);
         } else {
             auto s2 = s + ANSI_NORMAL "\n";

src/nix/search.cc

@@ -75,10 +75,6 @@ struct CmdSearch : SourceExprCommand, MixJSON
             Example{
                 "To search for git and frontend or gui:",
                 "nix search git 'frontend|gui'"
-            },
-            Example{
-                "To display the description of the found packages:",
-                "nix search git --verbose"
             }
         };
     }
@@ -262,6 +258,7 @@ struct CmdSearch : SourceExprCommand, MixJSON
                    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66145 */
                 if (!jsonCacheFile)
                     throw Error("error writing to %s", tmpFile);
+                throw;
             }
 
             if (writeCache && rename(tmpFile.c_str(), jsonCacheFileName.c_str()) == -1)

src/nix/verify.cc

@@ -113,8 +113,7 @@ struct CmdVerify : StorePathsCommand
 
                         auto doSigs = [&](StringSet sigs) {
                             for (auto sig : sigs) {
-                                if (sigsSeen.count(sig)) continue;
+                                if (!sigsSeen.insert(sig).second) continue;
-                                sigsSeen.insert(sig);
                                 if (validSigs < ValidPathInfo::maxSigs && info->checkSignature(publicKeys, sig))
                                     validSigs++;
                             }

src/resolve-system-dependencies/resolve-system-dependencies.cc

@@ -117,9 +117,7 @@ Path resolveSymlink(const Path & path)
 std::set<string> resolveTree(const Path & path, PathSet & deps)
 {
     std::set<string> results;
-    if (deps.count(path))
+    if (!deps.insert(path).second) return {};
-        return {};
-    deps.insert(path);
     for (auto & lib : runResolver(path)) {
         results.insert(lib);
         for (auto & p : resolveTree(lib, deps)) {

tests/nix-channel.sh

@@ -36,7 +36,7 @@ grep -q 'item.*attrPath="foo".*name="dependencies"' $TEST_ROOT/meta.xml
 
 # Do an install.
 nix-env -i dependencies
-[ -e $TEST_ROOT/var/nix/profiles/default/foobar ]
+[ -e $TEST_HOME/.nix-profile/foobar ]
 
 clearProfiles
 rm -f $TEST_HOME/.nix-channels
@@ -55,5 +55,5 @@ grep -q 'item.*attrPath="foo".*name="dependencies"' $TEST_ROOT/meta.xml
 
 # Do an install.
 nix-env -i dependencies
-[ -e $TEST_ROOT/var/nix/profiles/default/foobar ]
+[ -e $TEST_HOME/.nix-profile/foobar ]
 

tests/nix-profile.sh

@@ -7,8 +7,3 @@ rm -rf $TEST_HOME $TEST_ROOT/profile-var
 mkdir -p $TEST_HOME
 USER=$user $SHELL -e -c ". $TEST_ROOT/nix-profile.sh; set"
 USER=$user $SHELL -e -c ". $TEST_ROOT/nix-profile.sh" # test idempotency
-
-[ -L $TEST_HOME/.nix-profile ]
-[ -e $TEST_HOME/.nix-channels ]
-[ -e $TEST_ROOT/profile-var/nix/gcroots/per-user/$user ]
-[ -e $TEST_ROOT/profile-var/nix/profiles/per-user/$user ]

tests/remote-store.sh

@@ -13,3 +13,7 @@ cmp $TEST_ROOT/d1 $TEST_ROOT/d2
 nix-store --gc --max-freed 1K
 
 killDaemon
+
+user=$(whoami)
+[ -e $NIX_STATE_DIR/gcroots/per-user/$user ]
+[ -e $NIX_STATE_DIR/profiles/per-user/$user ]

tests/user-envs.sh

@@ -20,7 +20,7 @@ drvPath10=$(nix-env -f ./user-envs.nix -qa --drv-path --no-name '*' | grep foo-1
 
 # Query descriptions.
 nix-env -f ./user-envs.nix -qa '*' --description | grep -q silly
-rm -f $HOME/.nix-defexpr
+rm -rf $HOME/.nix-defexpr
 ln -s $(pwd)/user-envs.nix $HOME/.nix-defexpr
 nix-env -qa '*' --description | grep -q silly