Speed up 'pmbootstrap checksum'

Don't install gcc, ccache, git when the user only wants to update the
checksums of a package.

Reviewed-by: Caleb Connolly <kc@postmarketos.org>
Tested-by: Caleb Connolly <kc@postmarketos.org>
Link: https://lists.sr.ht/~postmarketos/pmbootstrap-devel/%3C20230419192042.3951-3-ollieparanoid@postmarketos.org%3E

pmb/build/__init__.py

@@ -1,6 +1,6 @@
 # Copyright 2023 Oliver Smith
 # SPDX-License-Identifier: GPL-3.0-or-later
-from pmb.build.init import init, init_compiler
+from pmb.build.init import init, init_abuild_minimal, init_compiler
 from pmb.build.envkernel import package_kernel
 from pmb.build.kconfig import menuconfig
 from pmb.build.newapkbuild import newapkbuild

pmb/build/checksum.py

@@ -10,7 +10,7 @@ import pmb.helpers.pmaports
 
 def update(args, pkgname):
     """ Fetch all sources and update the checksums in the APKBUILD. """
-    pmb.build.init(args)
+    pmb.build.init_abuild_minimal(args)
     pmb.build.copy_to_buildpath(args, pkgname)
     logging.info("(native) generate checksums for " + pkgname)
     pmb.chroot.user(args, ["abuild", "checksum"],
@@ -24,7 +24,7 @@ def update(args, pkgname):
 
 def verify(args, pkgname):
     """ Fetch all sources and verify their checksums. """
-    pmb.build.init(args)
+    pmb.build.init_abuild_minimal(args)
     pmb.build.copy_to_buildpath(args, pkgname)
     logging.info("(native) verify checksums for " + pkgname)
 

pmb/build/init.py

@@ -12,14 +12,14 @@ import pmb.chroot.apk
 import pmb.helpers.run
 
 
-def init(args, suffix="native"):
-    marker = f"{args.work}/chroot_{suffix}/tmp/pmb_chroot_build_init_done"
+def init_abuild_minimal(args, suffix="native"):
+    """ Initialize a minimal chroot with abuild where one can do
+        'abuild checksum'. """
+    marker = f"{args.work}/chroot_{suffix}/tmp/pmb_chroot_abuild_init_done"
     if os.path.exists(marker):
         return
 
-    # Initialize chroot, install packages
-    pmb.chroot.apk.install(args, pmb.config.build_packages, suffix,
-                           build=False)
+    pmb.chroot.apk.install(args, ["abuild"], suffix, build=False)
 
     # Fix permissions
     pmb.chroot.root(args, ["chown", "root:abuild",
@@ -27,6 +27,24 @@ def init(args, suffix="native"):
     pmb.chroot.root(args, ["chmod", "g+w",
                            "/var/cache/distfiles"], suffix)
 
+    # Add user to group abuild
+    pmb.chroot.root(args, ["adduser", "pmos", "abuild"], suffix)
+
+    pathlib.Path(marker).touch()
+
+
+def init(args, suffix="native"):
+    """ Initialize a chroot for building packages with abuild. """
+    marker = f"{args.work}/chroot_{suffix}/tmp/pmb_chroot_build_init_done"
+    if os.path.exists(marker):
+        return
+
+    init_abuild_minimal(args, suffix)
+
+    # Initialize chroot, install packages
+    pmb.chroot.apk.install(args, pmb.config.build_packages, suffix,
+                           build=False)
+
     # Generate package signing keys
     chroot = args.work + "/chroot_" + suffix
     if not os.path.exists(args.work + "/config_abuild/abuild.conf"):
@@ -63,9 +81,6 @@ def init(args, suffix="native"):
                                "/usr/local/bin/gzip"], suffix)
         pmb.chroot.root(args, ["chmod", "+x", "/usr/local/bin/gzip"], suffix)
 
-    # Add user to group abuild
-    pmb.chroot.root(args, ["adduser", "pmos", "abuild"], suffix)
-
     # abuild.conf: Don't clean the build folder after building, so we can
     # inspect it afterwards for debugging
     pmb.chroot.root(args, ["sed", "-i", "-e", "s/^CLEANUP=.*/CLEANUP=''/",