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Reserve some disk space for the garbage collector

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We can't open a SQLite database if the disk is full.  Since this
prevents the garbage collector from running when it's most needed, we
reserve some dummy space that we can free just before doing a garbage
collection.  This actually revives some old code from the Berkeley DB
days.

Fixes #27.
This commit is contained in:
Eelco Dolstra 2012-05-29 22:59:12 -04:00
parent 2c26985835
commit 4bc4da331a
9 changed files with 35 additions and 11 deletions
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2
src/libstore/worker-protocol.hh
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@ -8,7 +8,7 @@ namespace nix {
#define WORKER_MAGIC_1 0x6e697863
#define WORKER_MAGIC_2 0x6478696f
#define PROTOCOL_VERSION 0x10a
#define PROTOCOL_VERSION 0x10b
#define GET_PROTOCOL_MAJOR(x) ((x) & 0xff00)
#define GET_PROTOCOL_MINOR(x) ((x) & 0x00ff)