(cherry picked from commit bd9eb5c)

(cherry picked from commit ea8d320)

This reverts commit e90530e.

It appears that this backported test relies on new functionality.

The error is:

    + nix copy --to file:///build/nix-test/binary-cache /build/nix-test/store/dckdy2xp7sn8qvyx8axxjq7clnxddri1-multi-output
    warning: you don't have Internet access; disabling some network-dependent features
    error: uploading to 'file:///build/nix-test/binary-cache/nar/0hpfhrig9h6fvbjmiwsb7zkaxr19vr2w048y4xb3nrs36bagf92n.nar.xz' is not supported

…ution-loop

Backport issue 3964 substitution loop

Tested against AWS SDK 1.8.99. Fixes #3201.

(cherry picked from commit e20a3ec)

Backport compatibility with newer AWS SDKs to 2.3 (#4316)

GitHub now omits the etag, but 304 implies it matches the one we
provided. Just use that one to avoid having an etag-less resource.

Fixes #4469

(cherry picked from commit a766824)

… used

While the progress dots during the copying of the store work fine on a
normal terminal, those look pretty off if the script is run inside a
provisioning script of e.g. `vagrant` or `packer` where `stderr` and
`stdout` are captured:

    default: .
    default: ..
    default: .
    default: .
    default: .

To work around this, the script checks with `-t 0` if it's
running on an actual terminal and doesn't show the progress if that's not
the case.

(cherry picked from commit d9367a2)

[backport 2.3] Fix #4469

When starting a nix-shell with `-i` it was previously possible for it to
silently fail in the scenario where the specified interpreter didn't
exist. This happened due to the `exec` call masking the issue.

With this change we enable `execfail`, which causes the script using
`nix-shell` as interpreter to correctly exit with code 127.

Fixes: #4598
(cherry picked from commit 6e849e3)

Backport #4601

…-fix

backport #4411

(cherry picked from commit 0431cf6)
Signed-off-by: Domen Kožar <domen@dev.si>

NIX_PROFILES is space separated list of directories, and passing it into
for as is is considered to be 1-element list with the whole string. With
shwordsplit option Zsh emulates other shells in this regard ans
implicitely splits unquoted strings into words.

Fixes #4167.

Fix iterating over $NIX_PROFILES in Zsh (backport to 2.3)