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doc: Show bootstrapping at the package level. 

* doc/images/bootstrap-packages.dot: New file.
* doc.am (DOT_FILES): Add it.
* doc/guix.texi (Bootstrapping): Show 'guix graph' commands.  Includes
'images/bootstrap-packages' and comment it.
This commit is contained in:
Ludovic Courtès 2016-01-12 15:52:56 +01:00
parent 16aa649117
commit d33fa0c714
4 changed files with 145 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
.gitignore vendored
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@ -134,3 +134,6 @@ GTAGS
/doc/images/service-graph.eps
/doc/images/service-graph.pdf
/doc/images/dmd-graph.png
/doc/images/bootstrap-packages.png
/doc/images/bootstrap-packages.eps
/doc/images/bootstrap-packages.pdf

1
doc.am
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@ -22,6 +22,7 @@ info_TEXINFOS = doc/guix.texi
DOT_FILES = \
doc/images/bootstrap-graph.dot \
doc/images/bootstrap-packages.dot \
doc/images/coreutils-graph.dot \
doc/images/coreutils-bag-graph.dot \
doc/images/service-graph.dot \

43
doc/guix.texi
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@ -10167,7 +10167,16 @@ re-create them if needed (more on that later).
The figure above shows the very beginning of the dependency graph of the
distribution, corresponding to the package definitions of the @code{(gnu
packages bootstrap)} module. At this level of detail, things are
packages bootstrap)} module. A similar figure can be generated with
@command{guix graph} (@pxref{Invoking guix graph}), along the lines of:
@example
guix graph -t derivation \
-e '(@@@@ (gnu packages bootstrap) %bootstrap-gcc)' \
| dot -Tps > t.ps
@end example
At this level of detail, things are
slightly complex. First, Guile itself consists of an ELF executable,
along with many source and compiled Scheme files that are dynamically
loaded when it runs. This gets stored in the @file{guile-2.0.7.tar.xz}
@ -10203,9 +10212,6 @@ etc., at which point we have a working C tool chain.
@unnumberedsubsec Building the Build Tools
@c TODO: Add a package-level dependency graph generated from (gnu
@c packages base).
Bootstrapping is complete when we have a full tool chain that does not
depend on the pre-built bootstrap tools discussed above. This
no-dependency requirement is verified by checking whether the files of
@ -10214,17 +10220,40 @@ directories of the bootstrap inputs. The process that leads to this
``final'' tool chain is described by the package definitions found in
the @code{(gnu packages commencement)} module.
The @command{guix graph} command allows us to ``zoom out'' compared to
the graph above, by looking at the level of package objects instead of
individual derivations---remember that a package may translate to
several derivations, typically one derivation to download its source,
one to build the Guile modules it needs, and one to actually build the
package from source. The command:
@example
guix graph -t bag \
-e '(@@@@ (gnu packages commencement)
glibc-final-with-bootstrap-bash)' | dot -Tps > t.ps
@end example
@noindent
produces the dependency graph leading to the ``final'' C
library@footnote{You may notice the @code{glibc-intermediate} label,
suggesting that it is not @emph{quite} final, but as a good
approximation, we will consider it final.}, depicted below.
@image{images/bootstrap-packages,6in,,Dependency graph of the early packages}
@c See <http://lists.gnu.org/archive/html/gnu-system-discuss/2012-10/msg00000.html>.
The first tool that gets built with the bootstrap binaries is
GNU Make, which is a prerequisite for all the following packages.
From there Findutils and Diffutils get built.
GNU@tie{}Make---noted @code{make-boot0} above---which is a prerequisite
for all the following packages. From there Findutils and Diffutils get
built.
Then come the first-stage Binutils and GCC, built as pseudo cross
tools---i.e., with @code{--target} equal to @code{--host}. They are
used to build libc. Thanks to this cross-build trick, this libc is
guaranteed not to hold any reference to the initial tool chain.
From there the final Binutils and GCC are built. GCC uses @code{ld}
From there the final Binutils and GCC (not shown above) are built.
GCC uses @code{ld}
from the final Binutils, and links programs against the just-built libc.
This tool chain is used to build the other packages used by Guix and by
the GNU Build System: Guile, Bash, Coreutils, etc.

105
doc/images/bootstrap-packages.dot Normal file
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@ -0,0 +1,105 @@
digraph "Guix bag" {
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"/gnu/store/rkm2xr9581hfvcimz6a8xav2s5vfjciv-glibc-intermediate-2.22.drv" -> "/gnu/store/fxzy6h3c9ls97lw9wgv9m5w2ga7mw0kk-gcc-cross-boot0-4.9.3.drv" [color = red];
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