Check shell profile is writeable before modifying
The `set -e` at the top of the script causes the installation to fail to complete if the shell profile is not writeable. Checking file existence only is not enough.
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@ -92,7 +92,7 @@ p=$NIX_LINK/etc/profile.d/nix.sh
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added=
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for i in .bash_profile .bash_login .profile; do
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fn="$HOME/$i"
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if [ -e "$fn" ]; then
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if [ -w "$fn" ]; then
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if ! grep -q "$p" "$fn"; then
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echo "modifying $fn..." >&2
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echo "if [ -e $p ]; then . $p; fi # added by Nix installer" >> $fn
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