Sugg: Improve for mock (caching)

[seth vidal]

> ok, a little bit late, but I implemented caching now so I can provide
> some real numbers:
> 
> Traditional 'mock init' on a tmpfs takes
> 
> | Init buildroot...
> |
> | real    1m37.445s
> | user    1m15.329s
> | sys     0m8.009s
> 
> tar'ing this filesystem, and extracting it takes
> 
> | Extracting cached buildroot...
> | 
> | real    0m1.266s
> | user    0m0.188s
> | sys     0m0.944s
> 
> 
> Both operations are resulting into the same root-fs; the executed code
> was:
> 
> | mock=( env http_proxy= mock --resultdir="$results" -r "$MOCK_ROOT" )
> | mock_yum=( env http_proxy= /usr/sbin/mock-helper yum --installroot "$BUILD_DIR" )
> |
> | function initBuildroot() {
> |     "${mock[@]}" clean >/dev/null
> | 
> |     if test -e "$CACHE_NAME"; then
> |         echo "Extracting cached buildroot..."
> |         time /usr/sbin/mock-helper uncache "$MOCK_ROOT"
> | 
> |         echo "Updating metadata..."
> |         "${mock_yum[@]}" check-update || :
> |     else
> |         lock
> |         echo "Init buildroot..."
> |         time "${mock[@]}" init >/dev/null
> |         unlock
> | 
> |         echo "Cleaning up root..."
> |         "${mock_yum[@]}" clean packages headers
> |         echo "Creating cache..."
> |         /usr/sbin/mock-helper cache "$MOCK_ROOT"
> |      fi
> | }
> 
> The 'cache' and 'uncache' operations of 'mock-helper' were added by me
> and are simple 'tar' wrappers. The resulting tarball is uncompressed and
> 280MB sized, both the rootfs and the tarball are located in the tmpfs.
> 
> Environment:
>   mock-machine:      Intel Celeron 2.80GHz, 1500MB RAM
>   repository-server: PII 266MHz, 196MB RAM, http-access to repo (Apache2)
>   100Mb/s LAN; 'wget' download rate between repo and mock machine appr. 7-8MB/s
> 
> 

okay - that looks great. could I talk you into applying those patches to
the mock package in fedora cvs and testing it out? If it works and
people are happy with it then I don't see any reason not to use it.

fair enough?

-sv