regression: installer has no output in place of nix.sh path

[bam80]

Describe the bug

In the end of the installation, installer outputs an empty space in place of the etc/profile.d/nix.sh path:

$ bash <(curl -L https://nixos.org/nix/install) 
...
Note: a multi-user installation is possible. See https://nixos.org/manual/nix/stable/installation/installing-binary.html#multi-user-installation
performing a single-user installation of Nix...
copying Nix to /nix/store.............................................................
installing 'nix-2.28.3'
building '/nix/store/j8pmzgxnl2zhq2j1fc3j73qrv2i7k48g-user-environment.drv'...
unpacking 1 channels...

Installation finished!  To ensure that the necessary environment
variables are set, please add the line

  . 

to your shell profile (e.g. ~/.profile).

Additional context

Fedora 41

Checklist

• checked latest Nix manual (source)
• checked open bug issues and pull requests for possible duplicates

---

Add 👍 to issues you find important.

[abathur]

It looks like this hasn't been touched in a few years (unless there are some cut lines not visible in the blame):

https://github.com/NixOS/nix/blame/f2671886f5caee2ca7720a7b235aa1e40a2df5c3/scripts/install-nix-from-tarball.sh#L214-L280

From the code, I suspect your homedir has zero of the profiles on lines 219, 231, or 244?

nix/scripts/install-nix-from-tarball.sh

Lines 214 to 280 in f267188

	p=
	p_sh=$NIX_LINK/etc/profile.d/nix.sh
	p_fish=$NIX_LINK/etc/profile.d/nix.fish
	if [ -z "$NIX_INSTALLER_NO_MODIFY_PROFILE" ]; then
	# Make the shell source nix.sh during login.
	for i in .bash_profile .bash_login .profile; do
	fn="$HOME/$i"
	if [ -w "$fn" ]; then
	if ! grep -q "$p_sh" "$fn"; then
	echo "modifying $fn..." >&2
	printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p_sh" "$p_sh" >> "$fn"
	fi
	added=1
	p=${p_sh}
	break
	fi
	done
	for i in .zshenv .zshrc; do
	fn="$HOME/$i"
	if [ -w "$fn" ]; then
	if ! grep -q "$p_sh" "$fn"; then
	echo "modifying $fn..." >&2
	printf '\nif [ -e %s ]; then . %s; fi # added by Nix installer\n' "$p_sh" "$p_sh" >> "$fn"
	fi
	added=1
	p=${p_sh}
	break
	fi
	done
	if [ -d "$HOME/.config/fish" ]; then
	fishdir=$HOME/.config/fish/conf.d
	if [ ! -d "$fishdir" ]; then
	mkdir -p "$fishdir"
	fi
	fn="$fishdir/nix.fish"
	echo "placing $fn..." >&2
	printf '\nif test -e %s; . %s; end # added by Nix installer\n' "$p_fish" "$p_fish" > "$fn"
	added=1
	p=${p_fish}
	fi
	else
	p=${p_sh}
	fi
	if [ -z "$added" ]; then
	cat >&2 <<EOF
	Installation finished! To ensure that the necessary environment
	variables are set, please add the line
	. $p
	to your shell profile (e.g. ~/.profile).
	EOF
	else
	cat >&2 <<EOF
	Installation finished! To ensure that the necessary environment
	variables are set, either log in again, or type
	. $p
	in your shell.
	EOF
	fi

If that's right, then this was likely introduced in:

• Add Fish suport to the Nix installer #7014

What shell are you using? What profile script paths does it use?

[bam80]

@abathur that's right, there are no profiles here.
I use bash, with full installation it has ~/.bash_profile, but not in my case.

[bam80]

If that's right, then this was likely introduced in:

#7014

Just a note I use single-user install mode.