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Handle case collisions on case-insensitive systems

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When running NixOps under Mac OS X, we need to be able to import store
paths built on Linux into the local Nix store. However, HFS+ is
usually case-insensitive, so if there are directories with file names
that differ only in case, then importing will fail.

The solution is to add a suffix ("~nix~case~hack~<integer>") to
colliding files. For instance, if we have a directory containing
xt_CONNMARK.h and xt_connmark.h, then the latter will be renamed to
"xt_connmark.h~nix~case~hack~1". If a store path is dumped as a NAR,
the suffixes are removed. Thus, importing and exporting via a
case-insensitive Nix store is round-tripping. So when NixOps calls
nix-copy-closure to copy the path to a Linux machine, you get the
original file names back.

Closes #119.
This commit is contained in:
Eelco Dolstra 2014-07-16 16:02:05 +02:00
parent bb65460feb
commit 276a40b31f
6 changed files with 122 additions and 76 deletions
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2
tests/local.mk
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@ -10,7 +10,7 @@ nix_tests = \
remote-store.sh export.sh export-graph.sh negative-caching.sh \
binary-patching.sh timeout.sh secure-drv-outputs.sh nix-channel.sh \
multiple-outputs.sh import-derivation.sh fetchurl.sh optimise-store.sh \
binary-cache.sh nix-profile.sh repair.sh dump-db.sh
binary-cache.sh nix-profile.sh repair.sh dump-db.sh case-hack.sh
# parallel.sh
install-tests += $(foreach x, $(nix_tests), tests/$(x))