diff options
| -rw-r--r-- | doc/guix.texi | 24 | ||||
| -rw-r--r-- | nix/nix-daemon/guix-daemon.cc | 33 |
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; |