maint: Migrate the CI software licensing to the REUSE Specification

Also change the copyright notice format in source files:

 - Old format: "Copyright (c) <Author> <Year>-<Year>"
 - New format: "Copyright (C) <Author> <Year>"

The new format is meant to reduce the diff output and to alleviate the
maintenance burden; the use of lowercase "(c)" vs. uppercase "(C)" is
meant to distinguish between the old format and the new format.

This is a cherry-pick of commit 28cb31ffa4
from branch 'libpng18'.

Signed-off-by: Cosmin Truta <ctruta@gmail.com>

REUSE.toml

@@ -0,0 +1,5 @@
+version = 1
+
+[[annotations]]
+SPDX-License-Identifier = "MIT"
+path = "ci/**"

ci/.shellcheckrc

@@ -1,3 +1,6 @@
+# Copyright (C) 2023 Cosmin Truta
+# SPDX-License-Identifier: MIT
+
 # Disable the "expressions don't expand in single quotes, use double quotes"
 # advice. We need the regular expressions to remain uninterpolated.
 disable=SC2016

ci/README.md

@@ -4,22 +4,21 @@ Scripts for the Continuous Integration of the PNG Reference Library
 Copyright Notice
 ----------------
 
-Copyright (c) 2019-2026 Cosmin Truta.
+Copyright (C) 2019 Cosmin Truta.
 
 Use, modification and distribution are subject to the MIT License.
-Please see the accompanying file `LICENSE_MIT.txt` or visit
+Please see the accompanying file `LICENSES/MIT.txt` or visit
 <https://opensource.org/license/mit>
 
 File List
 ---------
 
-    LICENSE_MIT.txt         ==>  The License file
     README.md               ==>  This file
     ci_lint.sh              ==>  Lint the source code
-    ci_shellify.sh          ==>  Convert select definitions to shell syntax
     ci_verify_cmake.sh      ==>  Verify the build driven by CMakeLists.txt
     ci_verify_configure.sh  ==>  Verify the build driven by configure
     ci_verify_makefiles.sh  ==>  Verify the build driven by scripts/makefile.*
     ci_verify_version.sh    ==>  Verify the consistency of version definitions
-    lib/ci.lib.sh           ==>  Shell utilities for the main ci_*.sh scripts
+    lib/ci.lib.sh           ==>  Shell library for the main ci_*.sh scripts
+    libexec/ci_*.sh         ==>  Shell utilities for the main ci_*.sh scripts
     targets/*/ci_env.*.sh   ==>  Shell environments for cross-platform testing

ci/ci_lint.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/ci_verify_cmake.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/ci_verify_configure.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/ci_verify_makefiles.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/ci_verify_version.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/lib/ci.lib.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 test -f "$BASH_SOURCE" || {

ci/libexec/ci_shellify_autoconf.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/libexec/ci_shellify_c.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/libexec/ci_shellify_cmake.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/libexec/ci_shellify_shell.sh

@@ -1,11 +1,7 @@
 #!/usr/bin/env bash
 set -o errexit -o pipefail -o posix
 
-# Copyright (c) 2019-2025 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2019 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 # shellcheck source=ci/lib/ci.lib.sh

ci/targets/android/ci_env.aarch64-linux-android.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=aarch64

ci/targets/android/ci_env.armv7a-linux-androideabi.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=arm

ci/targets/android/ci_env.i686-linux-android.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/android/ci_env.x86_64-linux-android.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/cygwin/ci_env.i686-pc-cygwin.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/cygwin/ci_env.x86_64-pc-cygwin.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/darwin/ci_env.arm64-apple-darwin.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=arm64

ci/targets/darwin/ci_env.x86_64-apple-darwin.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/freebsd/ci_env.aarch64-unknown-freebsd.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=aarch64

ci/targets/freebsd/ci_env.i686-unknown-freebsd.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/freebsd/ci_env.riscv64-unknown-freebsd.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=riscv64

ci/targets/freebsd/ci_env.x86_64-unknown-freebsd.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/linux/ci_env.aarch64-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=aarch64

ci/targets/linux/ci_env.arm-linux-gnueabi.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=arm

ci/targets/linux/ci_env.arm-linux-gnueabihf.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=arm

ci/targets/linux/ci_env.i686-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/linux/ci_env.mips-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mips

ci/targets/linux/ci_env.mips64-linux-gnuabi64.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mips64

ci/targets/linux/ci_env.mips64el-linux-gnuabi64.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mips64el

ci/targets/linux/ci_env.mipsel-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mipsel

ci/targets/linux/ci_env.mipsisa32r6-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mipsisa32r6

ci/targets/linux/ci_env.mipsisa32r6el-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mipsisa32r6el

ci/targets/linux/ci_env.mipsisa64r6-linux-gnuabi64.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mipsisa64r6

ci/targets/linux/ci_env.mipsisa64r6el-linux-gnuabi64.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=mipsisa64r6el

ci/targets/linux/ci_env.powerpc-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=powerpc

ci/targets/linux/ci_env.powerpc64-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=powerpc64

ci/targets/linux/ci_env.powerpc64le-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=powerpc64le

ci/targets/linux/ci_env.riscv64-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=riscv64

ci/targets/linux/ci_env.x86_64-linux-gnu.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/msdos/ci_env.i386-pc-msdoswatcom.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i386

ci/targets/msdos/ci_env.i586-pc-msdosdjgpp.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i586

ci/targets/msdos/ci_env.i86-pc-msdoswatcom.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i86

ci/targets/windows/ci_env.aarch64-windows-llvm.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=aarch64

ci/targets/windows/ci_env.i686-w64-mingw32.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/windows/ci_env.i686-windows-llvm.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=i686

ci/targets/windows/ci_env.x86_64-w64-mingw32.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64

ci/targets/windows/ci_env.x86_64-windows-llvm.sh

@@ -1,8 +1,4 @@
-# Copyright (c) 2023-2024 Cosmin Truta.
-#
-# Use, modification and distribution are subject to the MIT License.
-# Please see the accompanying file LICENSE_MIT.txt
-#
+# Copyright (C) 2023 Cosmin Truta
 # SPDX-License-Identifier: MIT
 
 export CI_TARGET_ARCH=x86_64