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authorLudovic Courtès <ludo@gnu.org>2014-02-06 21:49:47 +0100
committerLudovic Courtès <ludo@gnu.org>2014-02-06 21:49:47 +0100
commit6e37066e76ce4ffaf8328242d941ca2e0af2965a (patch)
tree9d7337bc9b5ccc940e2df491582c036f85e08e74
parentc37b2b2aa5326feeeb4fa8edff988adf6fb96f15 (diff)
downloadgnu-guix-6e37066e76ce4ffaf8328242d941ca2e0af2965a.tar
gnu-guix-6e37066e76ce4ffaf8328242d941ca2e0af2965a.tar.gz
daemon: Add '--gc-keep-outputs' and '--gc-keep-derivations'.
* nix/nix-daemon/guix-daemon.cc (GUIX_OPT_GC_KEEP_OUTPUTS, GUIX_OPT_GC_KEEP_DERIVATIONS): New macros. (options): Add 'gc-keep-outputs' and 'gc-keep-derivations'. (string_to_bool): New function. (parse_opt): Honor GUIX_OPT_GC_KEEP_DERIVATIONS and GUIX_OPT_GC_KEEP_OUTPUTS. * doc/guix.texi (Invoking guix-daemon): Document --gc-keep-outputs and --gc-keep-derivations.
-rw-r--r--doc/guix.texi24
-rw-r--r--nix/nix-daemon/guix-daemon.cc33
2 files changed, 57 insertions, 0 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index 28b1cb8bd7..af84b75108 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -502,6 +502,30 @@ the daemon makes the new file a hard link to the other file. This
slightly increases the input/output load at the end of a build process.
This option disables this.
+@item --gc-keep-outputs[=yes|no]
+Tell whether the garbage collector (GC) must keep outputs of live
+derivations.
+
+When set to ``yes'', the GC will keep the outputs of any live derivation
+available in the store---the @code{.drv} files. The default is ``no'',
+meaning that derivation outputs are kept only if they are GC roots.
+
+@item --gc-keep-derivations[=yes|no]
+Tell whether the garbage collector (GC) must keep derivations
+corresponding to live outputs.
+
+When set to ``yes'', as is the case by default, the GC keeps
+derivations---i.e., @code{.drv} files---as long as at least one of their
+outputs is live. This allows users to keep track of the origins of
+items in their store. Setting it to ``no'' saves a bit of disk space.
+
+Note that when both @code{--gc-keep-derivations} and
+@code{--gc-keep-outputs} are used, the effect is to keep all the build
+prerequisites (the sources, compiler, libraries, and other build-time
+tools) of live objects in the store, regardless of whether these
+prerequisites are live. This is convenient for developers since it
+saves rebuilds or downloads.
+
@item --impersonate-linux-2.6
On Linux-based systems, impersonate Linux 2.6. This means that the
kernel's @code{uname} system call will report 2.6 as the release number.
diff --git a/nix/nix-daemon/guix-daemon.cc b/nix/nix-daemon/guix-daemon.cc
index d35b1cd076..79cd080363 100644
--- a/nix/nix-daemon/guix-daemon.cc
+++ b/nix/nix-daemon/guix-daemon.cc
@@ -30,6 +30,7 @@
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
+#include <strings.h>
#include <exception>
/* Variables used by `nix-daemon.cc'. */
@@ -68,6 +69,8 @@ builds derivations on behalf of its clients.";
#define GUIX_OPT_LISTEN 11
#define GUIX_OPT_NO_SUBSTITUTES 12
#define GUIX_OPT_NO_BUILD_HOOK 13
+#define GUIX_OPT_GC_KEEP_OUTPUTS 14
+#define GUIX_OPT_GC_KEEP_DERIVATIONS 15
static const struct argp_option options[] =
{
@@ -111,6 +114,14 @@ static const struct argp_option options[] =
" (this option has no effect in this configuration)"
#endif
},
+ { "gc-keep-outputs", GUIX_OPT_GC_KEEP_OUTPUTS,
+ "yes/no", OPTION_ARG_OPTIONAL,
+ "Tell whether the GC must keep outputs of live derivations" },
+ { "gc-keep-derivations", GUIX_OPT_GC_KEEP_DERIVATIONS,
+ "yes/no", OPTION_ARG_OPTIONAL,
+ "Tell whether the GC must keep derivations corresponding \
+to live outputs" },
+
{ "listen", GUIX_OPT_LISTEN, "SOCKET", 0,
"Listen for connections on SOCKET" },
{ "debug", GUIX_OPT_DEBUG, 0, 0,
@@ -118,6 +129,22 @@ static const struct argp_option options[] =
{ 0, 0, 0, 0, 0 }
};
+
+/* Convert ARG to a Boolean value, or throw an error if it does not denote a
+ Boolean. */
+static bool
+string_to_bool (const char *arg, bool dflt = true)
+{
+ if (arg == NULL)
+ return dflt;
+ else if (strcasecmp (arg, "yes") == 0)
+ return true;
+ else if (strcasecmp (arg, "no") == 0)
+ return false;
+ else
+ throw nix::Error (format ("'%1%': invalid Boolean value") % arg);
+}
+
/* Parse a single option. */
static error_t
parse_opt (int key, char *arg, struct argp_state *state)
@@ -168,6 +195,12 @@ parse_opt (int key, char *arg, struct argp_state *state)
case GUIX_OPT_DEBUG:
verbosity = lvlDebug;
break;
+ case GUIX_OPT_GC_KEEP_OUTPUTS:
+ settings.gcKeepOutputs = string_to_bool (arg);
+ break;
+ case GUIX_OPT_GC_KEEP_DERIVATIONS:
+ settings.gcKeepDerivations = string_to_bool (arg);
+ break;
case 'c':
settings.buildCores = atoi (arg);
break;