dcc37c236c
immediately add the result as a permanent GC root. This is the only
way to prevent a race with the garbage collector. For instance, the
old style
ln -s $(nix-store -r $(nix-instantiate foo.nix)) \
/nix/var/nix/gcroots/result
has two time windows in which the garbage collector can interfere
(by GC'ing the derivation and the output, respectively). On the
other hand,
nix-store --add-root /nix/var/nix/gcroots/result -r \
$(nix-instantiate --add-root /nix/var/nix/gcroots/drv \
foo.nix)
is safe.
* nix-build: use `--add-root' to prevent GC races.
49 lines
1.2 KiB
Plaintext
49 lines
1.2 KiB
Plaintext
#! @shell@ -e
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nixExpr=$1
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if test -z "$nixExpr"; then
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echo "syntax: $0 NIX-EXPR..." >&2
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exit 1
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fi
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extraArgs=
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noLink=
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userName=$USER
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if test -z "$username"; then userName="unknown"; fi
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for i in "$@"; do
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case "$i" in
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--no-link)
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noLink=1
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;;
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-*)
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extraArgs="$extraArgs $i"
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;;
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*)
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storeExprs=$(@bindir@/nix-instantiate \
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--add-root "@localstatedir@/nix/gcroots/nix-build/$userName-drv" \
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"$i")
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for j in $storeExprs; do
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echo "store expression is $j" >&2
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done
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outPaths=$(@bindir@/nix-store \
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--add-root "@localstatedir@/nix/gcroots/nix-build/$userName-out" \
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-rv $extraArgs $storeExprs)
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for j in $outPaths; do
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echo "$j"
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if test -z "$noLink"; then
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if test -L result; then
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rm result
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elif test -e result; then
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echo "cannot remove \`result' (not a symlink)"
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exit 1
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fi
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ln -s "$j" result
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fi
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done
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;;
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esac
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done
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