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* By default, `nix-env -i' now deletes previously installed

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derivations with names matching the derivations being installed.
  The option `--preserve-installed / -P' overrides this behaviour.
This commit is contained in:
Eelco Dolstra 2004-06-28 14:40:26 +00:00
parent 4d2946c516
commit 151e61fa5a
2 changed files with 58 additions and 3 deletions
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37
doc/manual/nix-env.xml
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@ -183,6 +183,10 @@
<arg choice='plain'><option>--install</option></arg>
<arg choice='plain'><option>-i</option></arg>
</group>
<group choice='opt'>
<arg choice='plain'><option>--preserve-installed</option></arg>
<arg choice='plain'><option>-P</option></arg>
</group>
<arg choice='plain' rep='repeat'><replaceable>drvnames</replaceable></arg>
</cmdsynopsis>
</refsection>
@ -197,6 +201,35 @@
in the active Nix expression are added.
</para>
<para>
Currently installed derivations with a name equal to the name
of a derivation being added are removed unless the option
<option>--preserve-installed</option> is specified.
</para>
</refsection>
<refsection>
<title>Flags</title>
<variablelist>
<varlistentry>
<term><option>--preserve-installed</option> / <option>-P</option></term>
<listitem>
<para>
Do not remove derivations with a name matching one of
the derivations being installed. Usually, trying to
have two versions of the same package installed in the
same generation of a profile will lead to an error in
building the generation, due to file name clashes
between the two versions. However, this is not the case
for all packages.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
@ -204,7 +237,11 @@
<screen>
$ nix-env --install gcc-3.3.2 <lineannotation>(install specific version)</lineannotation>
installing `gcc-3.3.2'
uninstalling `gcc-3.1' <lineannotation>(previously installed version is removed)</lineannotation>
$ nix-env --install gcc <lineannotation>(just pick any version)</lineannotation>
$ nix-env -f ~/foo.nix -i '*' <lineannotation>(install everything in <filename>foo.nix</filename>)</lineannotation></screen>
</refsection>