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authorCarlos O'Donell <carlos@redhat.com>2018-11-26 09:51:51 -0500
committerCarlos O'Donell <carlos@redhat.com>2018-12-03 10:15:39 -0500
commit8cebd4ffe67bf94508809ea0caa02a4f1d52e8b1 (patch)
tree37941e21ff2e02a3d6318eceeef5bc7d565215ae /locale
parentc22e4c2a1431c5e77bf4288d35bf7629f2f093aa (diff)
downloadglibc-8cebd4ffe67bf94508809ea0caa02a4f1d52e8b1.tar.gz
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 <carlos@redhat.com>
Diffstat (limited to 'locale')
-rw-r--r--locale/programs/localedef.c10
-rw-r--r--locale/programs/localedef.h1
-rw-r--r--locale/programs/locfile.c21
3 files changed, 28 insertions, 4 deletions
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;