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* A GC setting `gc-keep-outputs' to specify whether output paths of

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derivations should be kept.
This commit is contained in:
Eelco Dolstra 2005-02-01 22:07:48 +00:00
parent 2e6bf723e4
commit a37338815d
7 changed files with 102 additions and 7 deletions
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24
src/libstore/gc.cc
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@ -213,14 +213,9 @@ static void readTempRoots(PathSet & tempRoots, FDs & fds)
lockFile(*fd, ltRead, true);
/* Read the entire file. */
struct stat st;
if (fstat(*fd, &st) == -1)
throw SysError(format("statting `%1%'") % path);
unsigned char buf[st.st_size]; /* !!! stack space */
readFull(*fd, buf, st.st_size);
string contents = readFile(*fd);
/* Extract the roots. */
string contents((char *) buf, st.st_size);
unsigned int pos = 0, end;
while ((end = contents.find((char) 0, pos)) != string::npos) {
@ -310,7 +305,9 @@ static Paths topoSort(const PathSet & paths)
void collectGarbage(GCAction action, PathSet & result)
{
result.clear();
string gcKeepOutputs = querySetting("gc-keep-outputs", "false");
/* Acquire the global GC root. This prevents
a) New roots from being added.
b) Processes from creating new temporary root files. */
@ -333,6 +330,19 @@ void collectGarbage(GCAction action, PathSet & result)
for (PathSet::const_iterator i = roots.begin(); i != roots.end(); ++i)
computeFSClosure(canonPath(*i), livePaths);
if (gcKeepOutputs == "true") {
/* Hmz, identical to storePathRequisites in nix-store. */
for (PathSet::iterator i = livePaths.begin();
i != livePaths.end(); ++i)
if (isDerivation(*i)) {
Derivation drv = derivationFromPath(*i);
for (DerivationOutputs::iterator j = drv.outputs.begin();
j != drv.outputs.end(); ++j)
if (isValidPath(j->second.path))
computeFSClosure(j->second.path, livePaths);
}
}
if (action == gcReturnLive) {
result = livePaths;
return;