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nodegit/install.js at emscripten · jBox/nodegit · GitHub
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// Core Node.js modules.
var
os
=
require
(
'os'
)
;
var
fs
=
require
(
'fs'
)
;
var
path
=
require
(
'path'
)
;
var
zlib
=
require
(
'zlib'
)
;
var
exec
=
require
(
'child_process'
)
.
exec
;
// Third-party modules.
var
Q
=
require
(
'q'
)
;
var
request
=
require
(
'request'
)
;
var
tar
=
require
(
'tar'
)
;
var
which
=
require
(
'which'
)
;
// This will take in an object and find any matching keys in the environment
// to use as overrides.
//
// ENV variables:
//
// PKG: Location of `package.json` sans `.json`.
// LIBGIT2: Location of libgit2 source.
// BUILD: Location of nodegit build directory.
function
envOverride
(
obj
)
{
// Look through all keys.
return
Object
.
keys
(
obj
)
.
reduce
(
function
(
obj
,
key
)
{
var
normalize
=
key
.
toUpperCase
(
)
;
// Check for process environment existence.
if
(
normalize
in
process
.
env
)
{
obj
[
key
]
=
process
.
env
[
normalize
]
;
}
return
obj
;
}
,
obj
)
;
}
// Convert to the correct system path.
function
systemPath
(
parts
)
{
return
parts
.
join
(
path
.
sep
)
;
}
// Will be used near the end to configure `node-gyp`.
var
python
;
var
local
=
path
.
join
.
bind
(
path
,
__dirname
)
;
// Common reusable paths that can be overwritten by environment variables.
var
paths
=
envOverride
(
{
pkg
:
local
(
'package'
)
,
libgit2
:
local
(
'vendor/libgit2/'
)
,
sys
:
{
include
:
local
(
'include/sys'
)
,
src
:
local
(
'src/sys'
)
,
build
:
local
(
'build/Release/obj.target/src/sys'
)
}
}
)
;
// Load the package.json.
var
pkg
=
require
(
paths
.
pkg
)
;
// Ensure all dependencies are available.
var
dependencies
=
Q
.
allSettled
(
[
// This will prioritize `python2` over `python`, because we always want to
// work with Python 2.* if it's available.
Q
.
nfcall
(
which
,
'python2'
)
,
Q
.
nfcall
(
which
,
'python'
)
,
]
)
// Determine if all the dependency requirements are met.
.
then
(
function
(
results
)
{
console
.
info
(
'[nodegit] Determining dependencies.'
)
;
// Assign to reusable variables.
python
=
results
[
0
]
.
value
||
results
[
1
]
.
value
;
// Missing Python.
if
(
!
python
)
{
throw
new
Error
(
'Python is required to build libgit2.'
)
;
}
// Now lets check the Python version to ensure it's < 3.
return
Q
.
nfcall
(
exec
,
python
+
' --version'
)
.
then
(
function
(
version
)
{
if
(
version
[
1
]
.
indexOf
(
'Python 3'
)
===
0
)
{
throw
new
Error
(
'Incorrect version of Python, gyp requires < 3.'
)
;
}
}
)
;
}
)
// Successfully found all dependencies. First step is to detect the vendor
// directory.
.
then
(
function
(
)
{
console
.
info
(
'[nodegit] Detecting vendor/libgit2.'
)
;
return
Q
.
ninvoke
(
fs
,
'stat'
,
paths
.
libgit2
)
;
}
)
// If the directory already exists, no need to refetch.
.
fail
(
function
(
)
{
// Otherwise fetch the libgit2 source from GitHub.
console
.
info
(
'[nodegit] Fetching vendor/libgit2.'
)
;
var
url
=
'https://github.com/libgit2/libgit2/tarball/'
+
pkg
.
libgit2
.
sha
;
var
extract
=
tar
.
Extract
(
{
path
:
paths
.
libgit2
,
strip
:
true
}
)
;
// First extract from Zlib and then extract from Tar.
var
expand
=
request
.
get
(
url
)
.
pipe
(
zlib
.
createUnzip
(
)
)
.
pipe
(
extract
)
;
return
Q
.
ninvoke
(
expand
,
'on'
,
'end'
)
;
}
)
// Configure the native module using node-gyp.
.
then
(
function
(
)
{
console
.
info
(
'[nodegit] Configuring native node module.'
)
;
return
Q
.
nfcall
(
exec
,
systemPath
(
[
'.'
,
'node_modules'
,
'.bin'
,
'node-gyp configure --python '
+
python
]
)
,
{
cwd
:
'.'
}
)
;
}
)
// Build the native module using node-gyp.
.
then
(
function
(
)
{
console
.
info
(
'[nodegit] Building native node module.'
)
;
return
Q
.
nfcall
(
exec
,
systemPath
(
[
'.'
,
'node_modules'
,
'.bin'
,
'node-gyp build'
]
)
,
{
cwd
:
'.'
,
maxBuffer
:
Number
.
MAX_VALUE
}
)
;
}
)
// Display a success message.
.
then
(
function
(
)
{
console
.
info
(
'[nodegit] Completed installation successfully.'
)
;
}
)
// Display a warning message about failing to build native node module.
.
fail
(
function
(
message
)
{
console
.
info
(
'[nodegit] Failed to build nodegit.'
)
;
console
.
info
(
message
.
message
)
;
console
.
info
(
message
.
stack
)
;
}
)
;
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