wrap: Add support for applying a list of patch files

docs/markdown/Wrap-dependency-system-manual.md

@@ -247,6 +247,34 @@ With such wrap file, `find_program('myprog')` will automatically
 fallback to use the subproject, assuming it uses
 `meson.override_find_program('myprog')`.
 
+## Patch files
+
+*Since: 0.59.0*
+
+A list of local patch files can be provided in the `[patch-files]` section. They
+will be applied after the project has been extracted or cloned, and after the
+`patch_filename` has been applied. `git` or `patch` command-line tool must be
+available.
+
+The `[patch-files]` section is optional and might contain the following keys:
+- `strip`: Number of leading components from file names to strip. Defaults to 1
+  if omitted.
+- `patches`: A list of patch filenames relative to `subprojects/packagefiles`
+  directory. It must be in the python string list format (e.g. `['foo', 'bar']`).
+
+```ini
+[wrap-file]
+directory = libfoobar-1.0
+
+source_url = https://example.com/foobar-1.0.tar.gz
+source_filename = foobar-1.0.tar.gz
+source_hash = 5ebeea0dfb75d090ea0e7ff84799b2a7a1550db3fe61eb5f6f61c2e971e57663
+
+[patch-files]
+strip = 1
+patches = ['0001.patch', '0002.patch']
+```
+
 ## Using wrapped projects
 
 Wraps provide a convenient way of obtaining a project into your

docs/markdown/snippets/patch_files.md

@@ -0,0 +1,18 @@
+## Wrap files can contain a list of patch files to apply
+
+A list of local patch files can be provided by the `.wrap` file and they will be
+applied after the subproject has been extracted or cloned from git. This requires
+the `patch` or `git` command-line tool.
+
+```ini
+[wrap-file]
+directory = libfoobar-1.0
+
+source_url = https://example.com/foobar-1.0.tar.gz
+source_filename = foobar-1.0.tar.gz
+source_hash = 5ebeea0dfb75d090ea0e7ff84799b2a7a1550db3fe61eb5f6f61c2e971e57663
+
+[patch-files]
+strip = 1
+patches = ['0001.patch', '0002.patch']
+```

mesonbuild/wrap/wrap.py

@@ -27,11 +27,12 @@
 import configparser
 import typing as T
 import textwrap
+import ast
 
 from pathlib import Path
 from . import WrapMode
 from .. import coredata
-from ..mesonlib import quiet_git, GIT, ProgressBar, MesonException
+from ..mesonlib import quiet_git, GIT, ProgressBar, MesonException, Popen_safe
 from  .. import mesonlib
 
 if T.TYPE_CHECKING:
@@ -51,6 +52,8 @@
 
 ALL_TYPES = ['file', 'git', 'hg', 'svn']
 
+PATCH = shutil.which('patch')
+
 def whitelist_wrapdb(urlstr: str) -> urllib.parse.ParseResult:
     """ raises WrapException if not whitelisted subdomain """
     url = urllib.parse.urlparse(urlstr)
@@ -96,6 +99,7 @@ def __init__(self, fname: str):
         self.values = {} # type: T.Dict[str, str]
         self.provided_deps = {} # type: T.Dict[str, T.Optional[str]]
         self.provided_programs = [] # type: T.List[str]
+        self.patches: T.List[str] = []
         self.basename = os.path.basename(fname)
         self.has_wrap = self.basename.endswith('.wrap')
         self.name = self.basename[:-5] if self.has_wrap else self.basename
@@ -139,6 +143,7 @@ def parse_wrap(self) -> None:
             self.parse_wrap()
             return
         self.parse_provide_section(config)
+        self.parse_patch_files_section(config)
 
     def parse_wrap_section(self, config: configparser.ConfigParser) -> None:
         if len(config.sections()) < 1:
@@ -171,6 +176,12 @@ def parse_provide_section(self, config: configparser.ConfigParser) -> None:
                     raise WrapException(m.format(k, self.basename))
                 self.provided_deps[k] = v
 
+    def parse_patch_files_section(self, config: configparser.ConfigParser) -> None:
+        if config.has_section('patch-files'):
+            values = config['patch-files']
+            self.patches = ast.literal_eval(values.get('patches', '[]'))
+            self.strip = int(values.get('strip', '1'))
+
     def get(self, key: str) -> str:
         try:
             return self.values[key]
@@ -582,6 +593,30 @@ def apply_patch(self) -> None:
             if not os.path.isdir(src_dir):
                 raise WrapException(f'patch directory does not exists: {patch_dir}')
             self.copy_tree(src_dir, self.dirname)
+        for i in self.wrap.patches:
+            from ..interpreterbase import FeatureNew
+            FeatureNew('patch-files section', '0.59.0').use(self.current_subproject)
+            mlog.log(f'Applying patch {i}')
+            fname = os.path.join(self.wrap.filesdir, i)
+            if GIT:
+                if self.wrap.type == 'git':
+                    # Assume patches are made with `git format-patch`
+                    cmd = [GIT, 'am', fname]
+                else:
+                    # `git apply` can be used outside of a git repository, but
+                    # when used inside a git repository paths are assumed to be
+                    # relative to root git dir instead of current working dir.
+                    # Override that behaviour by using --work-tree.
+                    cmd = [GIT, '--work-tree', self.dirname, 'apply', fname]
+            elif PATCH:
+                cmd = [PATCH, '-f', '-i', fname]
+            else:
+                raise WrapException('Missing "git" or "patch" commands to apply patch files')
+            cmd += ['-p' + str(self.wrap.strip), '--ignore-whitespace']
+            p, o, e = Popen_safe(cmd, cwd=self.dirname, stderr=subprocess.STDOUT)
+            if p.returncode != 0:
+                mlog.log(o.strip())
+                raise WrapException('Failed to apply patch')
 
     def copy_tree(self, root_src_dir: str, root_dst_dir: str) -> None:
         """

test cases/common/153 wrap file should not failed/meson.build

@@ -14,3 +14,8 @@ executable('grabprog2', files('src/subprojects/foo/prog2.c'))
 subdir('src')
 
 subproject('patchdir')
+
+if find_program('patch', required : false).found() or find_program('git', required : false).found()
+  exe = subproject('patchfile').get_variable('foo_exe')
+  test('test_foo', exe)
+endif

test cases/common/153 wrap file should not failed/subprojects/packagefiles/patchfile/0001-Change-foo-to-executable.patch

@@ -0,0 +1,33 @@
+From b79f6cc4a096f6c2888f73b947b652491885896a Mon Sep 17 00:00:00 2001
+From: Xavier Claessens <[email protected]>
+Date: Fri, 30 Nov 2018 14:13:47 -0500
+Subject: [PATCH] Change foo to executable
+
+---
+ foo.c       | 4 ++++
+ meson.build | 2 +-
+ 2 files changed, 5 insertions(+), 1 deletion(-)
+
+diff --git a/foo.c b/foo.c
+index 54f9119..468f033 100644
+--- a/foo.c
++++ b/foo.c
+@@ -1,3 +1,7 @@
+ int dummy_func(void) {
+     return 44;
+ }
++
++int main(void) {
++    return dummy_func() == 44 ? 0 : 1;
++}
+diff --git a/meson.build b/meson.build
+index 318e81d..4a281d9 100644
+--- a/meson.build
++++ b/meson.build
+@@ -1,2 +1,2 @@
+ project('static lib patchdir', 'c')
+-libfoo = static_library('foo', 'foo.c')
++foo_exe = executable('foo', 'foo.c')
+-- 
+2.17.1
+

test cases/common/153 wrap file should not failed/subprojects/packagefiles/patchfile/0001-Change-return-value-to-43.patch

@@ -0,0 +1,21 @@
+From 7001dcc738e5ae7dfa8af20ed582b9a985804f72 Mon Sep 17 00:00:00 2001
+From: Xavier Claessens <[email protected]>
+Date: Fri, 30 Nov 2018 10:15:33 -0500
+Subject: [PATCH 1/2] Change return value to 43
+
+---
+ foo.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/foo.c b/foo.c
+index 019f2ba..e4577b8 100644
+--- a/foo.c
++++ b/foo.c
+@@ -1,3 +1,3 @@
+ int dummy_func(void) {
+-    return 42;
++    return 43;
+ }
+-- 
+2.17.1
+

test cases/common/153 wrap file should not failed/subprojects/packagefiles/patchfile/0002-Change-return-value-to-44.patch

@@ -0,0 +1,21 @@
+From c2da2e490b09f2e251c7f4ef7c1240acee215fec Mon Sep 17 00:00:00 2001
+From: Xavier Claessens <[email protected]>
+Date: Fri, 30 Nov 2018 10:15:47 -0500
+Subject: [PATCH 2/2] Change return value to 44
+
+---
+ foo.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/foo.c b/foo.c
+index e4577b8..54f9119 100644
+--- a/foo.c
++++ b/foo.c
+@@ -1,3 +1,3 @@
+ int dummy_func(void) {
+-    return 43;
++    return 44;
+ }
+-- 
+2.17.1
+

test cases/common/153 wrap file should not failed/subprojects/patchfile.wrap

@@ -0,0 +1,15 @@
+[wrap-file]
+directory = foo-1.0-patchfile
+
+source_url = http://something.invalid
+source_filename = foo-1.0.tar.xz
+source_hash = 9ed8f67d75e43d3be161efb6eddf30dd01995a958ca83951ea64234bac8908c1
+lead_directory_missing = true
+
+patch_directory = foo-1.0
+
+[patch-files]
+patches = ['patchfile/0001-Change-return-value-to-43.patch',
+           'patchfile/0002-Change-return-value-to-44.patch',
+           'patchfile/0001-Change-foo-to-executable.patch',
+          ]