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installation: allow profile modification to be skipped (#1072)

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The current behaviour modifies the first writeable file from amongst
.bash_profile, .bash_login and .profile.  So .bash_profile (if it is
writable) would be modified even if a user has already sourced nix.sh
in, say, .profile.

This commit introduces a new environment variable,
NIX_INSTALLER_NO_MODIFY_PROFILE.  If this is set during installation,
then the modifications are unconditionally skipped.

This is useful for users who have a manually curated set of dotfiles
that they are porting to a new machine. In such scenarios, nix.sh is
already sourced at a place where the user prefers.  Without this
change, the nix installer would insist on modifying .bash_profile if
it exists.

This commit also add documentations for both the current behaviour and
the new override.
This commit is contained in:
Manav Rathi 2016-11-03 22:32:29 +05:30 • committed by Domen Kožar
parent 18b7363a69
commit eec5409a69
2 changed files with 25 additions and 13 deletions
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8
doc/manual/installation/installing-binary.xml
View file

@ -26,6 +26,14 @@ $ mkdir /nix
$ chown alice /nix
</screen>
The install script will modify the first writable file from amongst
<filename>.bash_profile</filename>, <filename>.bash_login</filename>
and <filename>.profile</filename> to source
<filename>~/.nix-profile/etc/profile.d/nix.sh</filename>. You can set
the <command>NIX_INSTALLER_NO_MODIFY_PROFILE</command> environment
variable before executing the install script to disable this
behaviour.
</para>
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