* How often does git calculate SHAs?
@ 2012-01-30 14:25 Michael Cook
2012-01-30 14:59 ` Shawn Pearce
0 siblings, 1 reply; 2+ messages in thread
From: Michael Cook @ 2012-01-30 14:25 UTC (permalink / raw)
To: git
How often does git actually calculate a file's SHA?
`strace git status` shows that git stat'ed many files, but opened only a
few. So I assume git has some heuristicsbased on the stat infofor when
to recalculate the SHAs.
Any pointers to how I could have figured this out myself from looking at
the source code would be appreciated. Google wasn't helpful.
Michael
--
Michael Cook, Raytheon BBN Technologies, www.bbn.com
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: How often does git calculate SHAs?
2012-01-30 14:25 How often does git calculate SHAs? Michael Cook
@ 2012-01-30 14:59 ` Shawn Pearce
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Pearce @ 2012-01-30 14:59 UTC (permalink / raw)
To: Michael Cook; +Cc: git
On Mon, Jan 30, 2012 at 06:25, Michael Cook <mcook@bbn.com> wrote:
> How often does git actually calculate a file's SHA?
>
> `strace git status` shows that git stat'ed many files, but opened only a
> few. So I assume git has some heuristicsbased on the stat infofor when to
> recalculate the SHAs.
>
> Any pointers to how I could have figured this out myself from looking at the
> source code would be appreciated. Google wasn't helpful.
During `git status` Git performs an lstat() of every file in the
working tree. If the file matches stat structure data with the cache
held in .git/index, Git assumes the file is unmodified.
Things Git are looking for is usually size, mtime, inode number,
creation time, etc.
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