Allow bootstrap to be run before anything else is installed

README.md

@@ -78,7 +78,7 @@ If you've already partially compiled servo but forgot to do this step, run `./ma
 
 #### On Debian-based Linuxes
 
-Please run `sudo apt install python-virtualenv build-essential libssl-dev libffi-dev python-dev` followed by `./mach bootstrap`.
+Please run `./mach bootstrap`.
 
 If this doesn't work, file a bug, and, run the commands below:
 
@@ -103,7 +103,7 @@ If `virtualenv` does not exist, try `python-virtualenv`.
 
 #### On Fedora
 
-Please run `sudo dnf install python2-virtualenv gcc libffi-devel python-devel openssl-devel` followed by `./mach bootstrap`.
+Please run `./mach bootstrap`.
 
 If this doesn't work, file a bug, and, run the commands below:
 
@@ -118,7 +118,7 @@ sudo dnf install curl libtool gcc-c++ libXi-devel \
 #### On CentOS
 
 
-Please run `sudo yum install python2-virtualenv gcc libffi-devel python-devel openssl-devel` followed by `./mach bootstrap`.
+Please run `./mach bootstrap`.
 
 If this doesn't work, file a bug, and, run the commands below:
 

mach

@@ -20,8 +20,11 @@ def main(args):
     topdir = os.path.abspath(os.path.dirname(sys.argv[0]))
     sys.path.insert(0, os.path.join(topdir, "python"))
     import mach_bootstrap
-    mach = mach_bootstrap.bootstrap(topdir)
-    sys.exit(mach.run(sys.argv[1:]))
+    if len(sys.argv) > 1 and sys.argv[1] == "bootstrap":
+        sys.exit(mach_bootstrap.bootstrap_command_only(topdir))
+    else:
+        mach = mach_bootstrap.bootstrap(topdir)
+        sys.exit(mach.run(sys.argv[1:]))
 
 
 if __name__ == '__main__':

python/mach_bootstrap.py

@@ -224,11 +224,29 @@ def _is_windows():
     return sys.platform == 'win32'
 
 
+class DummyContext(object):
+    pass
+
+
+def bootstrap_command_only(topdir):
+    from servo.bootstrap import bootstrap
+
+    context = DummyContext()
+    context.topdir = topdir
+    force = False
+    if len(sys.argv) == 3 and sys.argv[2] == "-f":
+        force = True
+    bootstrap(context, force)
+    return 0
+
+
 def bootstrap(topdir):
     _ensure_case_insensitive_if_windows()
 
     topdir = os.path.abspath(topdir)
 
+    len(sys.argv) > 1 and sys.argv[1] == "bootstrap"
+
     # We don't support paths with Unicode characters for now
     # https://github.com/servo/servo/issues/10002
     try:

python/servo/bootstrap.py

@@ -49,11 +49,16 @@ def install_linux_deps(context, pkgs_ubuntu, pkgs_fedora, force):
             command.append('-y')
         print("Installing missing dependencies...")
         run_as_root(command + pkgs)
+        return True
+    return False
+
 
 def install_salt_dependencies(context, force):
     pkgs_apt = ['build-essential', 'libssl-dev', 'libffi-dev', 'python-dev']
     pkgs_dnf = ['gcc', 'libffi-devel', 'python-devel', 'openssl-devel']
-    install_linux_deps(context, pkgs_apt, pkgs_dnf, force)
+    if not install_linux_deps(context, pkgs_apt, pkgs_dnf, force):
+        print("Dependencies are already installed")
+
 
 def gstreamer(context, force=False):
     cur = os.curdir
@@ -62,6 +67,9 @@ def gstreamer(context, force=False):
         os.chdir(gstdir)
         subprocess.call(["bash", "gstreamer.sh"])
         os.chdir(cur)
+        return True
+    return False
+
 
 def linux(context, force=False):
     # Please keep these in sync with the packages in README.md
@@ -98,11 +106,13 @@ def linux(context, force=False):
     else:
         pkgs_apt += ["libssl1.0-dev"]
 
-    install_linux_deps(context, pkgs_apt, pkgs_dnf, force)
+    installed_something = install_linux_deps(context, pkgs_apt, pkgs_dnf, force)
 
     if not check_gstreamer_lib():
-        gstreamer(context, force)
+        installed_something |= gstreamer(context, force)
 
+    if not installed_something:
+        print("Dependencies were already installed!")
 
 
 def salt(context, force=False):

python/servo/util.py

@@ -20,7 +20,6 @@ import StringIO
 import sys
 import zipfile
 import urllib2
-import certifi
 
 
 try:
@@ -30,6 +29,7 @@ except ImportError:
 
 # The cafile parameter was added in 2.7.9
 if HAS_SNI and sys.version_info >= (2, 7, 9):
+    import certifi
     STATIC_RUST_LANG_ORG_DIST = "https://static.rust-lang.org/dist"
     URLOPEN_KWARGS = {"cafile": certifi.where()}
 else: