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Merge branch 'jn/fast-import-ondemand-checkpoint'

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* jn/fast-import-ondemand-checkpoint:
  fast-import: treat SIGUSR1 as a request to access objects early
This commit is contained in:
Junio C Hamano 2010-12-16 12:49:11 -08:00
parent 15368e1836 dc01f59d21
commit f73c3e9704
2 changed files with 47 additions and 1 deletions
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7
Documentation/git-fast-import.txt
View file

@ -1233,6 +1233,13 @@ and lazy loading of subtrees, allows fast-import to efficiently import
projects with 2,000+ branches and 45,114+ files in a very limited
memory footprint (less than 2.7 MiB per active branch).
Signals
-------
Sending *SIGUSR1* to the 'git fast-import' process ends the current
packfile early, simulating a `checkpoint` command. The impatient
operator can use this facility to peek at the objects and refs from an
import in progress, at the cost of some added running time and worse
compression.
Author
------

41
fast-import.c
View file

@ -362,6 +362,9 @@ static uintmax_t next_mark;
static struct strbuf new_data = STRBUF_INIT;
static int seen_data_command;
/* Signal handling */
static volatile sig_atomic_t checkpoint_requested;
static void parse_argv(void);
static void write_branch_report(FILE *rpt, struct branch *b)
@ -501,6 +504,32 @@ static NORETURN void die_nicely(const char *err, va_list params)
exit(128);
}
#ifndef SIGUSR1 /* Windows, for example */
static void set_checkpoint_signal(void)
{
}
#else
static void checkpoint_signal(int signo)
{
checkpoint_requested = 1;
}
static void set_checkpoint_signal(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = checkpoint_signal;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGUSR1, &sa, NULL);
}
#endif
static void alloc_objects(unsigned int cnt)
{
struct object_entry_pool *b;
@ -2715,14 +2744,20 @@ static void parse_reset_branch(void)
unread_command_buf = 1;
}
static void parse_checkpoint(void)
static void checkpoint(void)
{
checkpoint_requested = 0;
if (object_count) {
cycle_packfile();
dump_branches();
dump_tags();
dump_marks();
}
}
static void parse_checkpoint(void)
{
checkpoint_requested = 1;
skip_optional_lf();
}
@ -2979,6 +3014,7 @@ int main(int argc, const char **argv)
prepare_packed_git();
start_packfile();
set_die_routine(die_nicely);
set_checkpoint_signal();
while (read_next_command() != EOF) {
if (!strcmp("blob", command_buf.buf))
parse_new_blob();
@ -3000,6 +3036,9 @@ int main(int argc, const char **argv)
/* ignore non-git options*/;
else
die("Unsupported command: %s", command_buf.buf);
if (checkpoint_requested)
checkpoint();
}
/* argv hasn't been parsed yet, do so */