* Allow the size of the GC reserved file to be specified in nix.conf
through the new `gc-reserved-space' option.
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5 changed files with 62 additions and 14 deletions
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@ -52,6 +52,26 @@ env-keep-derivations = false
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</varlistentry>
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<varlistentry id="conf-gc-reserved-space"><term><literal>gc-reserved-space</literal></term>
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<listitem><para>This option specifies how much space should be
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reserved in normal use so that the garbage collector can run
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succesfully. Since the garbage collector must perform Berkeley DB
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transactions, it needs some disk space for itself. However, when
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the disk is full, this space is not available, so the collector
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would not be able to run precisely when it is most needed.</para>
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<para>For this reason, when Nix is run, it allocates a file
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<filename>/nix/var/nix/db/reserved</filename> of the size
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specified by this option. When the garbage collector is run, this
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file is deleted before the Berkeley DB environment is opened.
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This should give it enough room to proceed.</para>
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<para>The default is <literal>1048576</literal> (1
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MiB).</para></listitem>
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</varlistentry>
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<varlistentry><term><literal>env-keep-derivations</literal></term>
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<listitem><para>If <literal>false</literal> (default), derivations
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@ -11,7 +11,7 @@
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# build time (e.g., the C compiler, or source tarballs downloaded from
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# the network). To prevent it from doing so, set this option to
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# `true'.
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gc-keep-outputs = false
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#gc-keep-outputs = false
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### Option `gc-keep-derivations'
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@ -26,7 +26,26 @@ gc-keep-outputs = false
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# store path was built), so by default this option is on. Turn it off
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# to safe a bit of disk space (or a lot if `gc-keep-outputs' is also
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# turned on).
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gc-keep-derivations = true
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#gc-keep-derivations = true
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### Option `gc-reserved-space'
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#
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# This option specifies how much space should be reserved in normal
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# use so that the garbage collector can run succesfully. Since the
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# garbage collector must perform Berkeley DB transactions, it needs
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# some disk space for itself. However, when the disk is full, this
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# space is not available, so the collector would not be able to run
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# precisely when it is most needed.
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#
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# For this reason, when Nix is run, it allocates a file
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# /nix/var/nix/db/reserved of the size specified by this option. When
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# the garbage collector is run, this file is deleted before the
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# Berkeley DB environment is opened. This should give it enough room
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# to proceed.
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#
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# The default is "1048576" (1 MiB).
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#gc-reserved-space = 1048576
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### Option `env-keep-derivations'
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@ -46,7 +65,7 @@ gc-keep-derivations = true
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# this one is `sticky': it applies to any user environment created
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# while this option was enabled, while `gc-keep-derivations' only
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# applies at the moment the garbage collector is run.
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env-keep-derivations = false
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#env-keep-derivations = false
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### Option `build-allow-root'
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@ -56,7 +75,7 @@ env-keep-derivations = false
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# performed under the `root' user. If `false', builds are performed
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# under one of the users listed in the `build-users' option (see
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# below).
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build-allow-root = true
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#build-allow-root = true
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### Option `build-users'
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@ -77,4 +96,4 @@ build-allow-root = true
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#
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# Example:
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# build-users = nix-builder-1 nix-builder-2 nix-builder-3
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build-users =
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#build-users =
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@ -75,17 +75,22 @@ Strings querySetting(const string & name, const Strings & def)
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}
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bool queryBoolSetting(const string & name, bool def)
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string querySetting(const string & name, const string & def)
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{
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Strings defs;
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if (def) defs.push_back("true"); else defs.push_back("false");
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defs.push_back(def);
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Strings value = querySetting(name, defs);
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if (value.size() != 1)
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throw Error(format("configuration option `%1%' should be either `true' or `false', not a list")
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% name);
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throw Error(format("configuration option `%1%' should not be a list") % name);
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string v = value.front();
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return value.front();
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}
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bool queryBoolSetting(const string & name, bool def)
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{
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string v = querySetting(name, def ? "true" : "false");
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if (v == "true") return true;
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else if (v == "false") return false;
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else throw Error(format("configuration option `%1%' should be either `true' or `false', not `%2%'")
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@ -56,6 +56,8 @@ extern bool readOnlyMode;
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Strings querySetting(const string & name, const Strings & def);
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string querySetting(const string & name, const string & def);
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bool queryBoolSetting(const string & name, bool def);
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@ -82,12 +82,14 @@ void openDB(bool reserveSpace)
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try {
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Path reservedPath = nixDBPath + "/reserved";
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off_t reservedSize = 1024 * 1024;
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string s = querySetting("gc-reserved-space", "");
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int reservedSize;
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if (!string2Int(s, reservedSize)) reservedSize = 1024 * 1024;
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if (reserveSpace) {
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struct stat st;
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if (stat(reservedPath.c_str(), &st) == -1 ||
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st.st_size != reservedSize)
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writeFile(reservedPath, string(1024 * 1024, 'X'));
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writeFile(reservedPath, string(reservedSize, 'X'));
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}
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else
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deletePath(reservedPath);
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