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authorsterni <sternenseemann@systemli.org>2021-09-11T16·47+0200
committersterni <sternenseemann@systemli.org>2021-10-02T18·24+0000
commit66fa718cebb4808a95c17e7ee692cf8e5dc87653 (patch)
tree52f5409d179863d484de5bfa9695095562ca4d9a /nix/writeExecline
parent0eef0e343f6ac3b7afbe7f6895fce8b5d20d3b3a (diff)
feat(nix/utils): expose pathType of symlink target r/2947
In order to make readTree import symlinked directories I've been looking
into how to detect if a symlink points to a directory (since this would
allow us to use symlinks for //nix/sparseTree). I've found a hack for
this:

    symlinkPointsToDir = path: isSymlink path &&
      builtins.pathExists (toString path + "/.")

Unfortunately it doesn't seem to be possible to distinguish whether the
symlink target does not exist or is a regular file.

Since it's possible, I thought might as well add this to
`pathType`. To make returning the extra information workable, I've
elected to use the attribute set layout used by `//nix/tag`. This
doesn't require us to depend anything (as opposed to yants), but gives
us pattern matching (via `nix.tag.match`) and also quite idiomatic
checking of pathTypes:

    pathType ./foo ? file
    (pathType ./foo).symlink or null == "symlink-directory"

Nonexistent paths are encoded like this:

    pathType ./foo ? missing

Of course we can't use this in readTree (since it must be zero
dependency), but we can easily inline this hack at some point.

Change-Id: I15b64a1ea69953c95dc3239ef5860623652b3089
Reviewed-on: https://cl.tvl.fyi/c/depot/+/3535
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>
Reviewed-by: tazjin <mail@tazj.in>
Diffstat (limited to 'nix/writeExecline')
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