forked from lix-project/lix
* Refactoring.
* Convert tabs to spaces.
This commit is contained in:
Eelco Dolstra
parent
bd0ce1a4be
commit
2a4bac5459
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@ -3,16 +3,17 @@ ENV = SGML_CATALOG_FILES=$(docbookcatalog)
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XMLLINT = $(ENV) $(xmllint) $(xmlflags) --catalogs
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XSLTPROC = $(ENV) $(xsltproc) $(xmlflags) --catalogs
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SOURCES = book.xml introduction.xml installation.xml nix-reference.xml \
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SOURCES = book.xml introduction.xml installation.xml \
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nix-store-reference.xml \
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troubleshooting.xml bugs.xml
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book.is-valid: $(SOURCES)
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$(XMLLINT) --noout --valid book.xml
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touch $@
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man1_MANS = nix.1 fix.1
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man1_MANS = nix-store.1 nix-instantiate.1
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man nix.1 fix.1: $(SOURCES) book.is-valid
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man $(MANS): $(SOURCES) book.is-valid
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$(XSLTPROC) $(docbookxsl)/manpages/docbook.xsl book.xml
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book.html: $(SOURCES) book.is-valid
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@ -24,4 +25,6 @@ install-data-local: book.html
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$(INSTALL) -d $(datadir)/nix/manual
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$(INSTALL_DATA) book.html $(datadir)/nix/manual
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EXTRA_DIST = $(SOURCES) book.html nix.1 fix.1 book.is-valid
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EXTRA_DIST = $(SOURCES) book.html book.is-valid $(MANS)
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DISTCLEANFILES = book.html book.is-valid $(MANS)
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@ -5,8 +5,8 @@
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[
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<!ENTITY introduction SYSTEM "introduction.xml">
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<!ENTITY installation SYSTEM "installation.xml">
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<!ENTITY nix-reference SYSTEM "nix-reference.xml">
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<!ENTITY fix-reference SYSTEM "fix-reference.xml">
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<!ENTITY nix-store-reference SYSTEM "nix-store-reference.xml">
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<!ENTITY nix-instantiate-reference SYSTEM "nix-instantiate-reference.xml">
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<!ENTITY troubleshooting SYSTEM "troubleshooting.xml">
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<!ENTITY bugs SYSTEM "bugs.xml">
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]>
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@ -28,34 +28,10 @@
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&introduction;
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&installation;
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<chapter>
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<title>A Guided Tour</title>
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<para>
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</para>
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</chapter>
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<chapter>
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<title>Nix Syntax and Semantics</title>
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<para>
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</para>
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</chapter>
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<chapter>
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<title>Fix Language Reference</title>
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<para>
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</para>
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</chapter>
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<chapter>
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<title>Writing Builders</title>
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<para>
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</para>
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</chapter>
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<appendix>
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<title>Command Reference</title>
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&nix-reference;
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&fix-reference;
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&nix-store-reference;
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&nix-instantiate-reference;
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</appendix>
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&troubleshooting;
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@ -1,6 +1,6 @@
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<refentry>
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<refnamediv>
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<refname>fix</refname>
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<refname>nix-instantiate</refname>
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<refpurpose>generate Nix expressions from a high-level description</refpurpose>
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</refnamediv>
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@ -1,444 +0,0 @@
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<refentry>
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<refnamediv>
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<refname>nix</refname>
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<refpurpose>manipulate or query the Nix store</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>nix</command>
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<group choice='opt'>
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<arg><option>--path</option></arg>
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<arg><option>-p</option></arg>
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</group>
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<group choice='opt' rep='repeat'>
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<arg><option>--verbose</option></arg>
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<arg><option>-v</option></arg>
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</group>
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<group choice='opt' rep='repeat'>
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<arg><option>--keep-failed</option></arg>
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<arg><option>-K</option></arg>
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</group>
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<arg choice='plain'><replaceable>operation</replaceable></arg>
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<arg rep='repeat'><replaceable>options</replaceable></arg>
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<arg rep='repeat'><replaceable>arguments</replaceable></arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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The command <command>nix</command> provides access to the Nix store. This
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is the (set of) path(s) where Nix expressions and the file system objects
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built by them are stored.
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</para>
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<para>
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<command>nix</command> has many subcommands called
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<emphasis>operations</emphasis>. These are individually documented
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below. Exactly one operation must always be provided.
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</para>
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</refsect1>
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<refsect1>
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<title>Common Options</title>
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<para>
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In this section the options that are common to all Nix operations are
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listed. These options are allowed for every subcommand (although they
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may not always have an effect).
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</para>
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<variablelist>
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<varlistentry>
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<term><option>--path</option></term>
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<listitem>
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<para>
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Indicates that any identifier arguments to the operation are paths
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in the store rather than identifiers.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--verbose</option></term>
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<listitem>
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<para>
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Increases the level of verbosity of diagnostic messages printed on
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standard error. For each Nix operation, the information printed on
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standard output is well-defined and specified below in the
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respective sections. Any diagnostic information is printed on
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standard error, never on standard output.
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</para>
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<para>
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This option may be specified repeatedly. Currently, the following
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verbosity levels exist:
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</para>
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<variablelist>
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<varlistentry>
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<term>0</term>
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<listitem>
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<para>
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Print error messages only.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>1</term>
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<listitem>
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<para>
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Print informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>2</term>
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<listitem>
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<para>
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Print even more informational messages.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>3</term>
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<listitem>
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<para>
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Print messages that should only be useful for debugging.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>4</term>
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<listitem>
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<para>
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<quote>Vomit mode</quote>: print vast amounts of debug
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information.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--keep-failed</option></term>
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<listitem>
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<para>
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Specifies that in case of a build failure, the temporary directory
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(usually in <filename>/tmp</filename>) in which the build takes
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place should not be deleted. The path of the build directory is
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printed as an informational message.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--install</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--install</option></arg>
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<arg><option>-i</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>ids</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--install</option> realises the Nix expressions
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identified by <replaceable>ids</replaceable> in the file system. If
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these expressions are derivation expressions, they are first
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normalised. That is, their target paths are are built, unless a normal
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form is already known.
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</para>
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<para>
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The identifiers of the normal forms of the given Nix expressions are
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printed on standard output.
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</para>
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</refsect2>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--delete</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--delete</option></arg>
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<arg><option>-d</option></arg>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--delete</option> unconditionally deletes the
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paths <replaceable>paths</replaceable> from the Nix store. It is an
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error to attempt to delete paths outside of the store.
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</para>
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<warning>
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<para>
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This operation should almost never be called directly, since no
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attempt is made to verify that no references exist to the paths to
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be deleted. Therefore, careless deletion can result in an
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inconsistent system. Deletion of paths in the store is done by the
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garbage collector (which uses <option>--delete</option> to delete
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unreferenced paths).
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</para>
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</warning>
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</refsect2>
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</refsect1>
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<!--######################################################################-->
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<refsect1>
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<title>Operation <option>--query</option></title>
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<refsect2>
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<title>Synopsis</title>
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<cmdsynopsis>
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<command>nix</command>
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<group>
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<arg><option>--query</option></arg>
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<arg><option>-q</option></arg>
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</group>
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<group>
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<group>
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<arg><option>--list</option></arg>
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<arg><option>-l</option></arg>
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</group>
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<group>
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<arg><option>--requisites</option></arg>
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<arg><option>-r</option></arg>
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</group>
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<group>
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<arg><option>--expansion</option></arg>
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<arg><option>-e</option></arg>
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</group>
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<group>
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<arg><option>--graph</option></arg>
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<arg><option>-g</option></arg>
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</group>
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</group>
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<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
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</cmdsynopsis>
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</refsect2>
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<refsect2>
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<title>Description</title>
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<para>
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The operation <option>--query</option> displays various bits of
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information about Nix expressions or paths in the store. The queries
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are described in <xref linkend='nixref-queries' />. At most one query
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can be specified; the default query is <option>--list</option>.
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</para>
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</refsect2>
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<refsect2 id='nixref-queries'>
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<title>Queries</title>
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<variablelist>
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<varlistentry>
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<term><option>--list</option></term>
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<listitem>
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<para>
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Prints out the target paths of the Nix expressions indicated by
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the identifiers <replaceable>args</replaceable>. In the case of
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a derivation expression, these are the paths that will be
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produced by the builder of the expression. In the case of a
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slice expression, these are the root paths (which are generally
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the paths that were produced by the builder of the derivation
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expression of which the slice is a normal form).
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</para>
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||||
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||||
<para>
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||||
This query has one option:
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</para>
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<variablelist>
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||||
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<varlistentry>
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<term><option>--normalise</option></term>
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<listitem>
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<para>
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Causes the target paths of the <emphasis>normal
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forms</emphasis> of the expressions to be printed, rather
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||||
than the target paths of the expressions themselves.
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</para>
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||||
</listitem>
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</varlistentry>
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||||
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||||
</variablelist>
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||||
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||||
</listitem>
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</varlistentry>
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||||
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<varlistentry>
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<term><option>--requisites</option></term>
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<listitem>
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<para>
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Prints out the requisite paths of the Nix expressions indicated
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by the identifiers <replaceable>args</replaceable>. The
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requisite paths of a Nix expression are the paths that need to be
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present in the system to be able to realise the expression. That
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is, they form the <emphasis>closure</emphasis> of the expression
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in the file system (i.e., no path in the set of requisite paths
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||||
points to anything outside the set of requisite paths).
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||||
</para>
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||||
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||||
<para>
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||||
The notion of requisite paths is very useful when one wants to
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distribute Nix expressions. Since they form a closure, they are
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||||
the only paths one needs to distribute to another system to be
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||||
able to realise the expression on the other system.
|
||||
</para>
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||||
|
||||
<para>
|
||||
This query is generally used to implement various kinds of
|
||||
distribution. A <emphasis>source distribution</emphasis> is
|
||||
obtained by distributing the requisite paths of a derivation
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||||
expression. A <emphasis>binary distribution</emphasis> is
|
||||
obtained by distributing the requisite paths of a slice
|
||||
expression (i.e., the normal form of a derivation expression; you
|
||||
can directly specify the identifier of the slice expression, or
|
||||
use <option>--normalise</option> and specify the identifier of a
|
||||
derivation expression). A <emphasis>cache
|
||||
distribution</emphasis> is obtained by distributing the
|
||||
requisite paths of a derivation expression and specifying the
|
||||
option <option>--include-successors</option>. This will include
|
||||
not just the paths of a source and binary distribution, but also
|
||||
all expressions and paths of subterms of the source. This is
|
||||
useful if one wants to realise on the target system a Nix
|
||||
expression that is similar but not quite the same as the one
|
||||
being distributed, since any common subterms will be reused.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This query has a number of options:
|
||||
</para>
|
||||
|
||||
<variablelist>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--normalise</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Causes the requisite paths of the <emphasis>normal
|
||||
forms</emphasis> of the expressions to be printed, rather
|
||||
than the requisite paths of the expressions themselves.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--exclude-exprs</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Excludes the paths of Nix expressions. This causes the
|
||||
closure property to be lost, that is, the resulting set of
|
||||
paths is not enough to ensure realisibility.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--include-successors</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Also include the requisites of successors (normal forms).
|
||||
Only the requisites of <emphasis>known</emphasis>
|
||||
successors are included, i.e., the normal forms of
|
||||
derivation expressions that have never been normalised will
|
||||
not be included.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Note that not just the successor of a derivation expression
|
||||
will be included, but also the successors of all input
|
||||
expressions of that derivation expression. I.e., all
|
||||
normal forms of subterms involved in the normalisation of
|
||||
the top-level term are included.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--expansion</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
For each identifier in <replaceable>args</replaceable>, prints
|
||||
all expansions of that identifier, that is, all paths whose
|
||||
current content matches the identifier.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--graph</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Prints a graph of the closure of the expressions identified by
|
||||
<replaceable>args</replaceable> in the format of the
|
||||
<command>dot</command> tool of AT&T's GraphViz package.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</refsect2>
|
||||
|
||||
</refsect1>
|
||||
|
||||
|
||||
</refentry>
|
||||
|
||||
|
||||
<!--
|
||||
local variables:
|
||||
sgml-parent-document: ("book.xml" "refentry")
|
||||
end:
|
||||
-->
|
||||
444
doc/manual/nix-store-reference.xml
Normal file
444
doc/manual/nix-store-reference.xml
Normal file
|
|
@ -0,0 +1,444 @@
|
|||
<refentry>
|
||||
<refnamediv>
|
||||
<refname>nix-store</refname>
|
||||
<refpurpose>manipulate or query the Nix store</refpurpose>
|
||||
</refnamediv>
|
||||
|
||||
<refsynopsisdiv>
|
||||
<cmdsynopsis>
|
||||
<command>nix-store</command>
|
||||
<group choice='opt'>
|
||||
<arg><option>--path</option></arg>
|
||||
<arg><option>-p</option></arg>
|
||||
</group>
|
||||
<group choice='opt' rep='repeat'>
|
||||
<arg><option>--verbose</option></arg>
|
||||
<arg><option>-v</option></arg>
|
||||
</group>
|
||||
<group choice='opt' rep='repeat'>
|
||||
<arg><option>--keep-failed</option></arg>
|
||||
<arg><option>-K</option></arg>
|
||||
</group>
|
||||
<arg choice='plain'><replaceable>operation</replaceable></arg>
|
||||
<arg rep='repeat'><replaceable>options</replaceable></arg>
|
||||
<arg rep='repeat'><replaceable>arguments</replaceable></arg>
|
||||
</cmdsynopsis>
|
||||
</refsynopsisdiv>
|
||||
|
||||
<refsect1>
|
||||
<title>Description</title>
|
||||
|
||||
<para>
|
||||
The command <command>nix</command> provides access to the Nix store. This
|
||||
is the (set of) path(s) where Nix expressions and the file system objects
|
||||
built by them are stored.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
<command>nix</command> has many subcommands called
|
||||
<emphasis>operations</emphasis>. These are individually documented
|
||||
below. Exactly one operation must always be provided.
|
||||
</para>
|
||||
|
||||
</refsect1>
|
||||
|
||||
<refsect1>
|
||||
<title>Common Options</title>
|
||||
|
||||
<para>
|
||||
In this section the options that are common to all Nix operations are
|
||||
listed. These options are allowed for every subcommand (although they
|
||||
may not always have an effect).
|
||||
</para>
|
||||
|
||||
<variablelist>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--path</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Indicates that any identifier arguments to the operation are paths
|
||||
in the store rather than identifiers.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--verbose</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Increases the level of verbosity of diagnostic messages printed on
|
||||
standard error. For each Nix operation, the information printed on
|
||||
standard output is well-defined and specified below in the
|
||||
respective sections. Any diagnostic information is printed on
|
||||
standard error, never on standard output.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This option may be specified repeatedly. Currently, the following
|
||||
verbosity levels exist:
|
||||
</para>
|
||||
|
||||
<variablelist>
|
||||
<varlistentry>
|
||||
<term>0</term>
|
||||
<listitem>
|
||||
<para>
|
||||
Print error messages only.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>1</term>
|
||||
<listitem>
|
||||
<para>
|
||||
Print informational messages.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>2</term>
|
||||
<listitem>
|
||||
<para>
|
||||
Print even more informational messages.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>3</term>
|
||||
<listitem>
|
||||
<para>
|
||||
Print messages that should only be useful for debugging.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
<varlistentry>
|
||||
<term>4</term>
|
||||
<listitem>
|
||||
<para>
|
||||
<quote>Vomit mode</quote>: print vast amounts of debug
|
||||
information.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
</variablelist>
|
||||
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--keep-failed</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Specifies that in case of a build failure, the temporary directory
|
||||
(usually in <filename>/tmp</filename>) in which the build takes
|
||||
place should not be deleted. The path of the build directory is
|
||||
printed as an informational message.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</refsect1>
|
||||
|
||||
|
||||
<!--######################################################################-->
|
||||
|
||||
<refsect1>
|
||||
<title>Operation <option>--install</option></title>
|
||||
|
||||
<refsect2>
|
||||
<title>Synopsis</title>
|
||||
<cmdsynopsis>
|
||||
<command>nix</command>
|
||||
<group>
|
||||
<arg><option>--install</option></arg>
|
||||
<arg><option>-i</option></arg>
|
||||
</group>
|
||||
<arg choice='plain' rep='repeat'><replaceable>ids</replaceable></arg>
|
||||
</cmdsynopsis>
|
||||
</refsect2>
|
||||
|
||||
<refsect2>
|
||||
<title>Description</title>
|
||||
|
||||
<para>
|
||||
The operation <option>--install</option> realises the Nix expressions
|
||||
identified by <replaceable>ids</replaceable> in the file system. If
|
||||
these expressions are derivation expressions, they are first
|
||||
normalised. That is, their target paths are are built, unless a normal
|
||||
form is already known.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The identifiers of the normal forms of the given Nix expressions are
|
||||
printed on standard output.
|
||||
</para>
|
||||
|
||||
</refsect2>
|
||||
|
||||
</refsect1>
|
||||
|
||||
|
||||
<!--######################################################################-->
|
||||
|
||||
<refsect1>
|
||||
<title>Operation <option>--delete</option></title>
|
||||
|
||||
<refsect2>
|
||||
<title>Synopsis</title>
|
||||
<cmdsynopsis>
|
||||
<command>nix</command>
|
||||
<group>
|
||||
<arg><option>--delete</option></arg>
|
||||
<arg><option>-d</option></arg>
|
||||
</group>
|
||||
<arg choice='plain' rep='repeat'><replaceable>paths</replaceable></arg>
|
||||
</cmdsynopsis>
|
||||
</refsect2>
|
||||
|
||||
<refsect2>
|
||||
<title>Description</title>
|
||||
|
||||
<para>
|
||||
The operation <option>--delete</option> unconditionally deletes the
|
||||
paths <replaceable>paths</replaceable> from the Nix store. It is an
|
||||
error to attempt to delete paths outside of the store.
|
||||
</para>
|
||||
|
||||
<warning>
|
||||
<para>
|
||||
This operation should almost never be called directly, since no
|
||||
attempt is made to verify that no references exist to the paths to
|
||||
be deleted. Therefore, careless deletion can result in an
|
||||
inconsistent system. Deletion of paths in the store is done by the
|
||||
garbage collector (which uses <option>--delete</option> to delete
|
||||
unreferenced paths).
|
||||
|
||||
</para>
|
||||
</warning>
|
||||
|
||||
</refsect2>
|
||||
|
||||
</refsect1>
|
||||
|
||||
|
||||
<!--######################################################################-->
|
||||
|
||||
<refsect1>
|
||||
<title>Operation <option>--query</option></title>
|
||||
|
||||
<refsect2>
|
||||
<title>Synopsis</title>
|
||||
<cmdsynopsis>
|
||||
<command>nix</command>
|
||||
<group>
|
||||
<arg><option>--query</option></arg>
|
||||
<arg><option>-q</option></arg>
|
||||
</group>
|
||||
<group>
|
||||
<group>
|
||||
<arg><option>--list</option></arg>
|
||||
<arg><option>-l</option></arg>
|
||||
</group>
|
||||
<group>
|
||||
<arg><option>--requisites</option></arg>
|
||||
<arg><option>-r</option></arg>
|
||||
</group>
|
||||
<group>
|
||||
<arg><option>--expansion</option></arg>
|
||||
<arg><option>-e</option></arg>
|
||||
</group>
|
||||
<group>
|
||||
<arg><option>--graph</option></arg>
|
||||
<arg><option>-g</option></arg>
|
||||
</group>
|
||||
</group>
|
||||
<arg choice='plain' rep='repeat'><replaceable>args</replaceable></arg>
|
||||
</cmdsynopsis>
|
||||
</refsect2>
|
||||
|
||||
<refsect2>
|
||||
<title>Description</title>
|
||||
|
||||
<para>
|
||||
The operation <option>--query</option> displays various bits of
|
||||
information about Nix expressions or paths in the store. The queries
|
||||
are described in <xref linkend='nixref-queries' />. At most one query
|
||||
can be specified; the default query is <option>--list</option>.
|
||||
</para>
|
||||
|
||||
</refsect2>
|
||||
|
||||
<refsect2 id='nixref-queries'>
|
||||
<title>Queries</title>
|
||||
|
||||
<variablelist>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--list</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Prints out the target paths of the Nix expressions indicated by
|
||||
the identifiers <replaceable>args</replaceable>. In the case of
|
||||
a derivation expression, these are the paths that will be
|
||||
produced by the builder of the expression. In the case of a
|
||||
slice expression, these are the root paths (which are generally
|
||||
the paths that were produced by the builder of the derivation
|
||||
expression of which the slice is a normal form).
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This query has one option:
|
||||
</para>
|
||||
|
||||
<variablelist>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--normalise</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Causes the target paths of the <emphasis>normal
|
||||
forms</emphasis> of the expressions to be printed, rather
|
||||
than the target paths of the expressions themselves.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--requisites</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Prints out the requisite paths of the Nix expressions indicated
|
||||
by the identifiers <replaceable>args</replaceable>. The
|
||||
requisite paths of a Nix expression are the paths that need to be
|
||||
present in the system to be able to realise the expression. That
|
||||
is, they form the <emphasis>closure</emphasis> of the expression
|
||||
in the file system (i.e., no path in the set of requisite paths
|
||||
points to anything outside the set of requisite paths).
|
||||
</para>
|
||||
|
||||
<para>
|
||||
The notion of requisite paths is very useful when one wants to
|
||||
distribute Nix expressions. Since they form a closure, they are
|
||||
the only paths one needs to distribute to another system to be
|
||||
able to realise the expression on the other system.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This query is generally used to implement various kinds of
|
||||
distribution. A <emphasis>source distribution</emphasis> is
|
||||
obtained by distributing the requisite paths of a derivation
|
||||
expression. A <emphasis>binary distribution</emphasis> is
|
||||
obtained by distributing the requisite paths of a slice
|
||||
expression (i.e., the normal form of a derivation expression; you
|
||||
can directly specify the identifier of the slice expression, or
|
||||
use <option>--normalise</option> and specify the identifier of a
|
||||
derivation expression). A <emphasis>cache
|
||||
distribution</emphasis> is obtained by distributing the
|
||||
requisite paths of a derivation expression and specifying the
|
||||
option <option>--include-successors</option>. This will include
|
||||
not just the paths of a source and binary distribution, but also
|
||||
all expressions and paths of subterms of the source. This is
|
||||
useful if one wants to realise on the target system a Nix
|
||||
expression that is similar but not quite the same as the one
|
||||
being distributed, since any common subterms will be reused.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
This query has a number of options:
|
||||
</para>
|
||||
|
||||
<variablelist>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--normalise</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Causes the requisite paths of the <emphasis>normal
|
||||
forms</emphasis> of the expressions to be printed, rather
|
||||
than the requisite paths of the expressions themselves.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--exclude-exprs</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Excludes the paths of Nix expressions. This causes the
|
||||
closure property to be lost, that is, the resulting set of
|
||||
paths is not enough to ensure realisibility.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--include-successors</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Also include the requisites of successors (normal forms).
|
||||
Only the requisites of <emphasis>known</emphasis>
|
||||
successors are included, i.e., the normal forms of
|
||||
derivation expressions that have never been normalised will
|
||||
not be included.
|
||||
</para>
|
||||
|
||||
<para>
|
||||
Note that not just the successor of a derivation expression
|
||||
will be included, but also the successors of all input
|
||||
expressions of that derivation expression. I.e., all
|
||||
normal forms of subterms involved in the normalisation of
|
||||
the top-level term are included.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--expansion</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
For each identifier in <replaceable>args</replaceable>, prints
|
||||
all expansions of that identifier, that is, all paths whose
|
||||
current content matches the identifier.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
<varlistentry>
|
||||
<term><option>--graph</option></term>
|
||||
<listitem>
|
||||
<para>
|
||||
Prints a graph of the closure of the expressions identified by
|
||||
<replaceable>args</replaceable> in the format of the
|
||||
<command>dot</command> tool of AT&T's GraphViz package.
|
||||
</para>
|
||||
</listitem>
|
||||
</varlistentry>
|
||||
|
||||
</variablelist>
|
||||
|
||||
</refsect2>
|
||||
|
||||
</refsect1>
|
||||
|
||||
|
||||
</refentry>
|
||||
|
||||
|
||||
<!--
|
||||
local variables:
|
||||
sgml-parent-document: ("book.xml" "refentry")
|
||||
end:
|
||||
-->
|
||||
Loading…
Reference in a new issue