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-rw-r--r--users/Profpatsch/atomically-write.nix28
1 files changed, 28 insertions, 0 deletions
diff --git a/users/Profpatsch/atomically-write.nix b/users/Profpatsch/atomically-write.nix
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+++ b/users/Profpatsch/atomically-write.nix
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+{ depot, pkgs, ... }:
+# Atomically write a file (just `>` redirection in bash
+# empties a file even if the command crashes).
+#
+# Maybe there is an existing tool for that?
+# But it’s easy enough to implement.
+#
+# Example:
+#   atomically-write
+#     ./to
+#     echo "foo"
+#
+# will atomically write the string "foo" into ./to
+let
+  atomically-write = pkgs.writers.writeDash "atomically-write" ''
+    set -e
+    to=$1
+    shift
+    # assumes that the tempfile is on the same file system, (or in memory)
+    # for the `mv` at the end to be more-or-less atomic.
+    tmp=$(${pkgs.coreutils}/bin/mktemp -d)
+    trap 'rm -r "$tmp"' EXIT
+    "$@" \
+      > "$tmp/out"
+    mv "$tmp/out" "$to"
+  '';
+
+in atomically-write