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| author | Nguyễn Thái Ngọc Duy <pclouds@gmail.com> | 2013-06-09 05:22:48 (GMT) |
|---|---|---|
| committer | Junio C Hamano <gitster@pobox.com> | 2013-06-09 23:07:50 (GMT) |
| commit | b12ca9631f86adc35b0c03fb5b792cd82c288288 (patch) | |
| tree | f41c4bec41a87c346eeb47962b6957b6fcfb11eb /sha1_file.c | |
| parent | edca4152560522a431a51fc0a06147fc680b5b18 (diff) | |
| download | git-b12ca9631f86adc35b0c03fb5b792cd82c288288.zip git-b12ca9631f86adc35b0c03fb5b792cd82c288288.tar.gz git-b12ca9631f86adc35b0c03fb5b792cd82c288288.tar.bz2 | |
core: use env variable instead of config var to turn on logging pack access
5f44324 (core: log offset pack data accesses happened - 2011-07-06)
provides a way to observe pack access patterns via a config
switch. Setting an environment variable looks more obvious than a
config var, especially when you just need to _observe_, and more
inline with other tracing knobs we have.
Document it as it may be useful for remote troubleshooting.
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'sha1_file.c')
| -rw-r--r-- | sha1_file.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/sha1_file.c b/sha1_file.c index 67e815b..7fa62c2 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -36,6 +36,9 @@ static inline uintmax_t sz_fmt(size_t s) { return s; } const unsigned char null_sha1[20]; +static const char *no_log_pack_access = "no_log_pack_access"; +static const char *log_pack_access; + /* * This is meant to hold a *small* number of objects that you would * want read_sha1_file() to be able to return, but yet you do not want @@ -1956,12 +1959,19 @@ static void write_pack_access_log(struct packed_git *p, off_t obj_offset) { static FILE *log_file; + if (!log_pack_access) + log_pack_access = getenv("GIT_TRACE_PACK_ACCESS"); + if (!log_pack_access) + log_pack_access = no_log_pack_access; + if (log_pack_access == no_log_pack_access) + return; + if (!log_file) { log_file = fopen(log_pack_access, "w"); if (!log_file) { error("cannot open pack access log '%s' for writing: %s", log_pack_access, strerror(errno)); - log_pack_access = NULL; + log_pack_access = no_log_pack_access; return; } } @@ -1992,7 +2002,7 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset, int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC; int base_from_cache = 0; - if (log_pack_access) + if (log_pack_access != no_log_pack_access) write_pack_access_log(p, obj_offset); /* PHASE 1: drill down to the innermost base object */ |