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authorManav Rathi <mx4492@gmail.com>2016-11-03T17·02+0530
committerDomen Kožar <domen@dev.si>2016-11-03T17·02+0100
commiteec5409a69054cf21214c3f5846ec0310fcb8228 (patch)
tree94ea1252280cbf32ebfe81d3a95e00f1e81fc37a /src
parent18b7363a699c0b5a4bf59d2b320dfc2b84dc4e67 (diff)
installation: allow profile modification to be skipped (#1072)
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.
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