From bdd4da595a265a091a859754a22688f7351cddee Mon Sep 17 00:00:00 2001 From: Petr Baudis Date: Wed, 13 Apr 2005 02:20:38 -0700 Subject: [PATCH] [PATCH] Make nsec checking optional The nsec field of ctime/mtime is now checked only with -DNSEC defined during compilation. nsec acts broken since it is stored in the icache but apparently just gets to zero when flushed to filesystem not supporting it (e.g. ext3), creating illusions of false changes. At least that's my impression. Signed-off-by: Petr Baudis --- Makefile | 7 +++++++ read-cache.c | 17 +++++++++++++---- 2 files changed, 20 insertions(+), 4 deletions(-) diff --git a/Makefile b/Makefile index ac61a61b0..c7e5c7467 100644 --- a/Makefile +++ b/Makefile @@ -1,10 +1,17 @@ # -DCOLLISION_CHECK if you believe that SHA1's # 1461501637330902918203684832716283019655932542976 hashes do not give you # enough guarantees about no collisions between objects ever hapenning. +# +# -DNSEC if you want git to care about sub-second file mtimes and ctimes. +# Note that you need some new glibc (at least >2.2.4) for this, and it will +# BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly +# break unless your underlying filesystem supports those sub-second times +# (my ext3 doesn't). CFLAGS=-g -O3 -Wall CC=gcc + PROG= update-cache show-diff init-db write-tree read-tree commit-tree \ cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \ check-files ls-tree diff --git a/read-cache.c b/read-cache.c index 2ee96bc92..f1abae144 100644 --- a/read-cache.c +++ b/read-cache.c @@ -250,11 +250,20 @@ int cache_match_stat(struct cache_entry *ce, struct stat *st) { unsigned int changed = 0; - if (ce->mtime.sec != (unsigned int)st->st_mtim.tv_sec || - ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec) + /* nsec seems unreliable - not all filesystems support it, so + * as long as it is in the inode cache you get right nsec + * but after it gets flushed, you get zero nsec. */ + if (ce->mtime.sec != (unsigned int)st->st_mtim.tv_sec +#ifdef NSEC + || ce->mtime.nsec != (unsigned int)st->st_mtim.tv_nsec +#endif + ) changed |= MTIME_CHANGED; - if (ce->ctime.sec != (unsigned int)st->st_ctim.tv_sec || - ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec) + if (ce->ctime.sec != (unsigned int)st->st_ctim.tv_sec +#ifdef NSEC + || ce->ctime.nsec != (unsigned int)st->st_ctim.tv_nsec +#endif + ) changed |= CTIME_CHANGED; if (ce->st_uid != (unsigned int)st->st_uid || ce->st_gid != (unsigned int)st->st_gid) -- 2.30.2