From 8cebd4ffe67bf94508809ea0caa02a4f1d52e8b1 Mon Sep 17 00:00:00 2001 From: Carlos O'Donell Date: Mon, 26 Nov 2018 09:51:51 -0500 Subject: Add --no-hard-links option to localedef (bug 23923) Downstream distributions need consistent sets of hardlinks in order for rpm to operate effectively. This means that even if locales are built with a high level of parallelism that the resulting files need to have consistent hardlink counts. The only way to achieve this is with a post-install hardlink pass using a program like 'hardlink' (shipped in Fedora). If the downstream distro wants to post-process the hardlinks then the time spent in localedef looking up sibling directories and processing hardlinks is wasted effort. To optimize the build and install pass we add a --no-hard-links option to localedef to avoid doing the hardlink optimziation for size. Tested on x86_64 with 'make localedata/install-locale-files' before and after. Without the patch we have files with 100+ hardlink counts. After the patch and running with --no-hard-links all link counts are 1. This patch also alters the convenience target 'make localedata/install-locale-files' to use the new option. Signed-off-by: Carlos O'Donell --- locale/programs/localedef.c | 10 ++++++++++ locale/programs/localedef.h | 1 + locale/programs/locfile.c | 21 +++++++++++++++++---- 3 files changed, 28 insertions(+), 4 deletions(-) (limited to 'locale') diff --git a/locale/programs/localedef.c b/locale/programs/localedef.c index d718d2e9f4..6c4936be6b 100644 --- a/locale/programs/localedef.c +++ b/locale/programs/localedef.c @@ -85,6 +85,9 @@ static bool replace_archive; /* If true list archive content. */ static bool list_archive; +/* If true create hard links to other locales (default). */ +bool hard_links = true; + /* Maximum number of retries when opening the locale archive. */ int max_locarchive_open_retry = 10; @@ -105,6 +108,7 @@ void (*argp_program_version_hook) (FILE *, struct argp_state *) = print_version; #define OPT_BIG_ENDIAN 401 #define OPT_NO_WARN 402 #define OPT_WARN 403 +#define OPT_NO_HARD_LINKS 404 /* Definitions of arguments for argp functions. */ static const struct argp_option options[] = @@ -120,6 +124,8 @@ static const struct argp_option options[] = { NULL, 0, NULL, 0, N_("Output control:") }, { "force", 'c', NULL, 0, N_("Create output even if warning messages were issued") }, + { "no-hard-links", OPT_NO_HARD_LINKS, NULL, 0, + N_("Do not create hard links between installed locales") }, { "prefix", OPT_PREFIX, N_("PATH"), 0, N_("Optional output file prefix") }, { "posix", OPT_POSIX, NULL, 0, N_("Strictly conform to POSIX") }, { "quiet", OPT_QUIET, NULL, 0, @@ -389,6 +395,10 @@ parse_opt (int key, char *arg, struct argp_state *state) /* Enable the warnings. */ set_warnings (arg, true); break; + case OPT_NO_HARD_LINKS: + /* Do not hard link to other locales. */ + hard_links = false; + break; case 'c': force_output = 1; break; diff --git a/locale/programs/localedef.h b/locale/programs/localedef.h index 0083faceab..e2b39e78f3 100644 --- a/locale/programs/localedef.h +++ b/locale/programs/localedef.h @@ -118,6 +118,7 @@ extern const char *repertoire_global; extern int max_locarchive_open_retry; extern bool no_archive; extern const char *alias_file; +extern bool hard_links; /* Prototypes for a few program-wide used functions. */ diff --git a/locale/programs/locfile.c b/locale/programs/locfile.c index 32e5f761f2..1555231deb 100644 --- a/locale/programs/locfile.c +++ b/locale/programs/locfile.c @@ -702,7 +702,7 @@ write_locale_data (const char *output_path, int catidx, const char *category, size_t cnt, step, maxiov; int fd; char *fname; - const char **other_paths; + const char **other_paths = NULL; uint32_t header[2]; size_t n_elem; struct iovec vec[3]; @@ -827,9 +827,22 @@ failure while writing data for category `%s'"), category); close (fd); - /* Compare the file with the locale data files for the same category in - other locales, and see if we can reuse it, to save disk space. */ - other_paths = siblings (output_path); + /* Compare the file with the locale data files for the same category + in other locales, and see if we can reuse it, to save disk space. + If the user specified --no-hard-links to localedef then hard_links + is false, other_paths remains NULL and we skip the optimization + below. The use of --no-hard-links is distribution specific since + some distros have post-processing hard-link steps and so doing this + here is a waste of time. Worse than a waste of time in rpm-based + distributions it can result in build determinism issues from + build-to-build since some files may get a hard link in one pass but + not in another (if the files happened to be created in parallel). */ + if (hard_links) + other_paths = siblings (output_path); + + /* If there are other paths, then walk the sibling paths looking for + files with the same content so we can hard link and reduce disk + space usage. */ if (other_paths != NULL) { struct stat64 fname_stat; -- cgit 1.4.1