skip unnecessary github actions steps

Summary:
X-link: https://github.com/facebookincubator/zstrong/pull/1100

Update generated github actions to only run the fetch and and build steps when there are sources expected for a manifest

For local github actions testing using `act` this speeds up the test runs, and in real github CI it makes it clearer which steps are actually doing something on the given runner (we don't know exactly what it has installed beforehand)

Also set the windows git config the same as on internal CI

Reviewed By: bigfootjon

Differential Revision: D67839708

fbshipit-source-id: 0a60c6fc89e8c6abb2464f879459aa23d5aec969

.github/workflows/getdeps_linux.yml

@@ -18,121 +18,182 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
     - uses: actions/checkout@v4
+    - id: paths
+      name: Query paths
+      run: python3 build/fbcode_builder/getdeps.py query-paths --recursive --src-dir=. proxygen  >> "$GITHUB_OUTPUT"
     - name: Fetch ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests ninja
     - name: Fetch cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests cmake
     - name: Fetch zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests zlib
     - name: Fetch zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests zstd
     - name: Fetch boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests boost
     - name: Fetch double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests double-conversion
     - name: Fetch fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fast_float
     - name: Fetch fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fmt
     - name: Fetch gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests gflags
     - name: Fetch glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests glog
     - name: Fetch googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests googletest
     - name: Fetch libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libdwarf
     - name: Fetch libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libevent
     - name: Fetch lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests lz4
     - name: Fetch snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests snappy
     - name: Fetch openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests openssl
     - name: Fetch liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests liboqs
     - name: Fetch autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests autoconf
     - name: Fetch automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests automake
     - name: Fetch libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libtool
     - name: Fetch gperf
+      if: ${{ steps.paths.outputs.gperf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests gperf
     - name: Fetch libiberty
+      if: ${{ steps.paths.outputs.libiberty_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libiberty
     - name: Fetch libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libsodium
     - name: Fetch libunwind
+      if: ${{ steps.paths.outputs.libunwind_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libunwind
     - name: Fetch xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests xz
     - name: Fetch folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests folly
     - name: Fetch fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fizz
     - name: Fetch mvfst
+      if: ${{ steps.paths.outputs.mvfst_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests mvfst
     - name: Fetch wangle
+      if: ${{ steps.paths.outputs.wangle_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests wangle
     - name: Build ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests ninja
     - name: Build cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests cmake
     - name: Build zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests zlib
     - name: Build zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests zstd
     - name: Build boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests boost
     - name: Build double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests double-conversion
     - name: Build fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fast_float
     - name: Build fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fmt
     - name: Build gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests gflags
     - name: Build glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests glog
     - name: Build googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests googletest
     - name: Build libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libdwarf
     - name: Build libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libevent
     - name: Build lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests lz4
     - name: Build snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests snappy
     - name: Build openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests openssl
     - name: Build liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests liboqs
     - name: Build autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests autoconf
     - name: Build automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests automake
     - name: Build libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libtool
     - name: Build gperf
+      if: ${{ steps.paths.outputs.gperf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests gperf
     - name: Build libiberty
+      if: ${{ steps.paths.outputs.libiberty_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libiberty
     - name: Build libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libsodium
     - name: Build libunwind
+      if: ${{ steps.paths.outputs.libunwind_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libunwind
     - name: Build xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests xz
     - name: Build folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests folly
     - name: Build fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fizz
     - name: Build mvfst
+      if: ${{ steps.paths.outputs.mvfst_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests mvfst
     - name: Build wangle
+      if: ${{ steps.paths.outputs.wangle_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests wangle
     - name: Build proxygen
       run: python3 build/fbcode_builder/getdeps.py build --src-dir=. proxygen  --project-install-prefix proxygen:/usr/local

.github/workflows/getdeps_mac.yml

@@ -18,113 +18,170 @@ jobs:
     runs-on: macOS-latest
     steps:
     - uses: actions/checkout@v4
+    - id: paths
+      name: Query paths
+      run: python3 build/fbcode_builder/getdeps.py query-paths --recursive --src-dir=. proxygen  >> "$GITHUB_OUTPUT"
     - name: Fetch ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests ninja
     - name: Fetch cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests cmake
     - name: Fetch zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests zlib
     - name: Fetch zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests zstd
     - name: Fetch boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests boost
     - name: Fetch double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests double-conversion
     - name: Fetch fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fast_float
     - name: Fetch fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fmt
     - name: Fetch gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests gflags
     - name: Fetch glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests glog
     - name: Fetch googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests googletest
     - name: Fetch libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libdwarf
     - name: Fetch lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests lz4
     - name: Fetch openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests openssl
     - name: Fetch snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests snappy
     - name: Fetch libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libevent
     - name: Fetch liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests liboqs
     - name: Fetch autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests autoconf
     - name: Fetch automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests automake
     - name: Fetch libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libtool
     - name: Fetch gperf
+      if: ${{ steps.paths.outputs.gperf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests gperf
     - name: Fetch libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests libsodium
     - name: Fetch xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests xz
     - name: Fetch folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests folly
     - name: Fetch fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests fizz
     - name: Fetch mvfst
+      if: ${{ steps.paths.outputs.mvfst_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests mvfst
     - name: Fetch wangle
+      if: ${{ steps.paths.outputs.wangle_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py fetch --no-tests wangle
     - name: Build ninja
+      if: ${{ steps.paths.outputs.ninja_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests ninja
     - name: Build cmake
+      if: ${{ steps.paths.outputs.cmake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests cmake
     - name: Build zlib
+      if: ${{ steps.paths.outputs.zlib_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests zlib
     - name: Build zstd
+      if: ${{ steps.paths.outputs.zstd_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests zstd
     - name: Build boost
+      if: ${{ steps.paths.outputs.boost_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests boost
     - name: Build double-conversion
+      if: ${{ steps.paths.outputs.double-conversion_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests double-conversion
     - name: Build fast_float
+      if: ${{ steps.paths.outputs.fast_float_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fast_float
     - name: Build fmt
+      if: ${{ steps.paths.outputs.fmt_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fmt
     - name: Build gflags
+      if: ${{ steps.paths.outputs.gflags_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests gflags
     - name: Build glog
+      if: ${{ steps.paths.outputs.glog_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests glog
     - name: Build googletest
+      if: ${{ steps.paths.outputs.googletest_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests googletest
     - name: Build libdwarf
+      if: ${{ steps.paths.outputs.libdwarf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libdwarf
     - name: Build lz4
+      if: ${{ steps.paths.outputs.lz4_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests lz4
     - name: Build openssl
+      if: ${{ steps.paths.outputs.openssl_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests openssl
     - name: Build snappy
+      if: ${{ steps.paths.outputs.snappy_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests snappy
     - name: Build libevent
+      if: ${{ steps.paths.outputs.libevent_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libevent
     - name: Build liboqs
+      if: ${{ steps.paths.outputs.liboqs_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests liboqs
     - name: Build autoconf
+      if: ${{ steps.paths.outputs.autoconf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests autoconf
     - name: Build automake
+      if: ${{ steps.paths.outputs.automake_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests automake
     - name: Build libtool
+      if: ${{ steps.paths.outputs.libtool_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libtool
     - name: Build gperf
+      if: ${{ steps.paths.outputs.gperf_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests gperf
     - name: Build libsodium
+      if: ${{ steps.paths.outputs.libsodium_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests libsodium
     - name: Build xz
+      if: ${{ steps.paths.outputs.xz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests xz
     - name: Build folly
+      if: ${{ steps.paths.outputs.folly_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests folly
     - name: Build fizz
+      if: ${{ steps.paths.outputs.fizz_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests fizz
     - name: Build mvfst
+      if: ${{ steps.paths.outputs.mvfst_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests mvfst
     - name: Build wangle
+      if: ${{ steps.paths.outputs.wangle_SOURCE }}
       run: python3 build/fbcode_builder/getdeps.py build --no-tests wangle
     - name: Build proxygen
       run: python3 build/fbcode_builder/getdeps.py build --src-dir=. proxygen  --project-install-prefix proxygen:/usr/local

build/fbcode_builder/getdeps.py

@@ -552,6 +552,33 @@ class ShowInstDirCmd(ProjectCmdBase):
         )
 
 
+@cmd("query-paths", "print the paths for tooling to use")
+class QueryPathsCmd(ProjectCmdBase):
+    def run_project_cmd(self, args, loader, manifest):
+        if args.recursive:
+            manifests = loader.manifests_in_dependency_order()
+        else:
+            manifests = [manifest]
+
+        for m in manifests:
+            fetcher = loader.create_fetcher(m)
+            if isinstance(fetcher, SystemPackageFetcher):
+                # We are guaranteed that if the fetcher is set to
+                # SystemPackageFetcher then this item is completely
+                # satisfied by the appropriate system packages
+                continue
+            src_dir = fetcher.get_src_dir()
+            print(f"{m.name}_SOURCE={src_dir}")
+
+    def setup_project_cmd_parser(self, parser):
+        parser.add_argument(
+            "--recursive",
+            help="print the transitive deps also",
+            action="store_true",
+            default=False,
+        )
+
+
 @cmd("show-source-dir", "print the source dir for a given project")
 class ShowSourceDirCmd(ProjectCmdBase):
     def run_project_cmd(self, args, loader, manifest):
@@ -1001,6 +1028,10 @@ class GenerateGitHubActionsCmd(ProjectCmdBase):
             manifest_ctx.set("test", "on")
         run_on = self.get_run_on(args)
 
+        tests_arg = "--no-tests "
+        if run_tests:
+            tests_arg = ""
+
         # Some projects don't do anything "useful" as a leaf project, only
         # as a dep for a leaf project. Check for those here; we don't want
         # to waste the effort scheduling them on CI.
@@ -1086,12 +1117,14 @@ jobs:
                 )
                 out.write("      shell: cmd\n")
 
-                # The git installation may not like long filenames, so tell it
-                # that we want it to use them!
                 out.write("    - name: Fix Git config\n")
-                out.write("      run: git config --system core.longpaths true\n")
-                out.write("    - name: Disable autocrlf\n")
-                out.write("      run: git config --system core.autocrlf false\n")
+                out.write("      run: >\n")
+                out.write("        git config --system core.longpaths true &&\n")
+                out.write("        git config --system core.autocrlf false &&\n")
+                # cxx crate needs symlinks enabled
+                out.write("        git config --system core.symlinks true\n")
+                # && is not supported on default windows powershell, so use cmd
+                out.write("      shell: cmd\n")
 
             out.write("    - uses: actions/checkout@v4\n")
 
@@ -1127,17 +1160,12 @@ jobs:
                 if build_opts.is_darwin():
                     # brew is installed as regular user
                     sudo_arg = ""
-                tests_arg = "--no-tests "
-                if run_tests:
-                    tests_arg = ""
-                out.write(
-                    f"      run: {sudo_arg}python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps {tests_arg}--recursive {manifest.name}\n"
-                )
+
+                system_deps_cmd = f"{sudo_arg}{getdepscmd}{allow_sys_arg} install-system-deps {tests_arg}--recursive {manifest.name}"
                 if build_opts.is_linux() or build_opts.is_freebsd():
-                    out.write("    - name: Install packaging system deps\n")
-                    out.write(
-                        f"      run: {sudo_arg}python3 build/fbcode_builder/getdeps.py --allow-system-packages install-system-deps {tests_arg}--recursive patchelf\n"
-                    )
+                    system_deps_cmd += f" && {sudo_arg}{getdepscmd}{allow_sys_arg} install-system-deps {tests_arg}--recursive patchelf"
+                out.write(f"      run: {system_deps_cmd}\n")
+
                 required_locales = manifest.get(
                     "github.actions", "required_locales", ctx=manifest_ctx
                 )
@@ -1152,6 +1180,18 @@ jobs:
                         out.write(f"    - name: Ensure {loc} locale present\n")
                         out.write(f"      run: {sudo_arg}locale-gen {loc}\n")
 
+            out.write("    - id: paths\n")
+            out.write("      name: Query paths\n")
+            if build_opts.is_windows():
+                out.write(
+                    f"      run: {getdepscmd}{allow_sys_arg} query-paths {tests_arg}--recursive --src-dir=. {manifest.name}  >> $env:GITHUB_OUTPUT\n"
+                )
+                out.write("      shell: pwsh\n")
+            else:
+                out.write(
+                    f'      run: {getdepscmd}{allow_sys_arg} query-paths {tests_arg}--recursive --src-dir=. {manifest.name}  >> "$GITHUB_OUTPUT"\n'
+                )
+
             projects = loader.manifests_in_dependency_order()
 
             main_repo_url = manifest.get_repo_url(manifest_ctx)
@@ -1178,25 +1218,32 @@ jobs:
                 ctx = loader.ctx_gen.get_context(m.name)
                 if m.get_repo_url(ctx) != main_repo_url:
                     out.write("    - name: Fetch %s\n" % m.name)
+                    out.write(
+                        f"      if: ${{{{ steps.paths.outputs.{m.name}_SOURCE }}}}\n"
+                    )
                     out.write(
                         f"      run: {getdepscmd}{allow_sys_arg} fetch --no-tests {m.name}\n"
                     )
 
             for m in projects:
-                if m != manifest:
-                    if m.name == "rust":
-                        continue
-                    else:
-                        src_dir_arg = ""
-                        ctx = loader.ctx_gen.get_context(m.name)
-                        if main_repo_url and m.get_repo_url(ctx) == main_repo_url:
-                            # Its in the same repo, so src-dir is also .
-                            src_dir_arg = "--src-dir=. "
-                            has_same_repo_dep = True
-                        out.write("    - name: Build %s\n" % m.name)
-                        out.write(
-                            f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{src_dir_arg}{free_up_disk}--no-tests {m.name}\n"
-                        )
+                if m == manifest or m.name == "rust":
+                    continue
+                src_dir_arg = ""
+                ctx = loader.ctx_gen.get_context(m.name)
+                if main_repo_url and m.get_repo_url(ctx) == main_repo_url:
+                    # Its in the same repo, so src-dir is also .
+                    src_dir_arg = "--src-dir=. "
+                    has_same_repo_dep = True
+
+                out.write("    - name: Build %s\n" % m.name)
+                if not src_dir_arg:
+                    # only run the step if needed
+                    out.write(
+                        f"      if: ${{{{ steps.paths.outputs.{m.name}_SOURCE }}}}\n"
+                    )
+                out.write(
+                    f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{src_dir_arg}{free_up_disk}--no-tests {m.name}\n"
+                )
 
             out.write("    - name: Build %s\n" % manifest.name)
 
@@ -1213,12 +1260,8 @@ jobs:
             if has_same_repo_dep:
                 no_deps_arg = "--no-deps "
 
-            no_tests_arg = ""
-            if not run_tests:
-                no_tests_arg = "--no-tests "
-
             out.write(
-                f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{no_tests_arg}{no_deps_arg}--src-dir=. {manifest.name} {project_prefix}\n"
+                f"      run: {getdepscmd}{allow_sys_arg} build {build_type_arg}{tests_arg}{no_deps_arg}--src-dir=. {manifest.name} {project_prefix}\n"
             )
 
             out.write("    - name: Copy artifacts\n")

build/fbcode_builder/getdeps/fetcher.py

@@ -244,7 +244,9 @@ class GitFetcher(Fetcher):
                     if not m:
                         raise Exception("Failed to parse rev from %s" % hash_file)
                     rev = m.group(1)
-                    print("Using pinned rev %s for %s" % (rev, repo_url))
+                    print(
+                        "Using pinned rev %s for %s" % (rev, repo_url), file=sys.stderr
+                    )
 
         self.rev = rev or "main"
         self.origin_repo = repo_url