Merge bitcoin/bitcoin#24409: Always output license/copyright info with `-version`

5a89bed410d724360b8f90bd9d7d28d6e62331c0 contrib: address gen-manpages feedback from #24263 (fanquake)
2618fb8d15d01dca967856c92ebf3e4cc09699a2 Output license info when binaries are passed -version (fanquake)
4c3e3c57463b029d335e685d3dcdaf26456666cf refactor: shift CopyrightHolders() and LicenseInfo() to clientversion.cpp (fanquake)

Pull request description:

  Addresses a review comment from #24263, and addresses the [comment](https://github.com/bitcoin/bitcoin/pull/24263#issuecomment-1030582925) where it was pointed out that we are inconsistent with emitting  our copyright. After this change, the copyright is always emitted with `-version`, rather than `-help`, i.e:
  ```bash
  bitcoind -version

  Bitcoin Core version v22.99.0-fc1f355913f6-dirty
  Copyright (C) 2009-2022 The Bitcoin Core developers

  Please contribute if you find Bitcoin Core useful. Visit
  <https://bitcoincore.org/> for further information about the software.
  The source code is available from <https://github.com/bitcoin/bitcoin>.

  This is experimental software.
  Distributed under the MIT software license, see the accompanying file COPYING
  or <https://opensource.org/licenses/MIT>
  ```

  The info is also added to binaries other than `bitcoind`/`bitcoin-qt`. This change also prevents duplicate copyright info appearing in the `bitcoind` man page.

ACKs for top commit:
  laanwj:
    Tested ACK 5a89bed410d724360b8f90bd9d7d28d6e62331c0

Tree-SHA512: 0ac2a1adf9e9de0c3206f35837008e3f93eaf15b193736203d71609273f0887cca20b8a90972cb9f941ebd62b330d61a0cbb5fb1b7a7f2dbc715ed8a0c1569d9

13 files changed, 68 insertions, 55 deletions

diff --git a/contrib/devtools/gen-manpages.py b/contrib/devtools/gen-manpages.py
index 05f613da38..26612cc444 100755
--- a/contrib/devtools/gen-manpages.py
+++ b/contrib/devtools/gen-manpages.py
@@ -32,7 +32,6 @@ mandir = os.getenv('MANDIR', os.path.join(topdir, 'doc/man'))
 
 # Verify that all the required binaries are usable, and extract copyright
 # message in a first pass.
-copyright = None
 versions = []
 for relpath in BINARIES:
     abspath = os.path.join(builddir, relpath)
@@ -42,18 +41,17 @@ for relpath in BINARIES:
         print(f'{abspath} not found or not an executable', file=sys.stderr)
         sys.exit(1)
     # take first line (which must contain version)
-    verstr = r.stdout.split('\n')[0]
+    verstr = r.stdout.splitlines()[0]
     # last word of line is the actual version e.g. v22.99.0-5c6b3d5b3508
     verstr = verstr.split()[-1]
     assert verstr.startswith('v')
+    # remaining lines are copyright
+    copyright = r.stdout.split('\n')[1:]
+    assert copyright[0].startswith('Copyright (C)')
 
-    # Only bitcoin-qt prints the copyright message on --version, so store it specifically.
-    if relpath == 'src/qt/bitcoin-qt':
-        copyright = r.stdout.split('\n')[1:]
+    versions.append((abspath, verstr, copyright))
 
-    versions.append((abspath, verstr))
-
-if any(verstr.endswith('-dirty') for (_, verstr) in versions):
+if any(verstr.endswith('-dirty') for (_, verstr, _) in versions):
     print("WARNING: Binaries were built from a dirty tree.")
     print('man pages generated from dirty binaries should NOT be committed.')
     print('To properly generate man pages, please commit your changes (or discard them), rebuild, then run this script again.')
@@ -61,13 +59,13 @@ if any(verstr.endswith('-dirty') for (_, verstr) in versions):
 
 with tempfile.NamedTemporaryFile('w', suffix='.h2m') as footer:
     # Create copyright footer, and write it to a temporary include file.
-    assert copyright
+    # Copyright is the same for all binaries, so just use the first.
     footer.write('[COPYRIGHT]\n')
-    footer.write('\n'.join(copyright).strip())
+    footer.write('\n'.join(versions[0][2]).strip())
     footer.flush()
 
     # Call the binaries through help2man to produce a manual page for each of them.
-    for (abspath, verstr) in versions:
+    for (abspath, verstr, _) in versions:
         outname = os.path.join(mandir, os.path.basename(abspath) + '.1')
         print(f'Generating {outname}…')
         subprocess.run([help2man, '-N', '--version-string=' + verstr, '--include=' + footer.name, '-o', outname, abspath], check=True)
diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index 874e38752a..5523fff3b2 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -133,7 +133,10 @@ static int AppInitRPC(int argc, char* argv[])
     }
     if (argc < 2 || HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
         std::string strUsage = PACKAGE_NAME " RPC client version " + FormatFullVersion() + "\n";
-        if (!gArgs.IsArgSet("-version")) {
+
+        if (gArgs.IsArgSet("-version")) {
+            strUsage += FormatParagraph(LicenseInfo());
+        } else {
             strUsage += "\n"
                 "Usage:  bitcoin-cli [options] <command> [params]  Send command to " PACKAGE_NAME "\n"
                 "or:     bitcoin-cli [options] -named <command> [name=value]...  Send command to " PACKAGE_NAME " (with named arguments)\n"
diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index ec07114d6e..b297081cab 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -102,7 +102,10 @@ static int AppInitRawTx(int argc, char* argv[])
     if (argc < 2 || HelpRequested(gArgs) || gArgs.IsArgSet("-version")) {
         // First part of help message is specific to this utility
         std::string strUsage = PACKAGE_NAME " bitcoin-tx utility version " + FormatFullVersion() + "\n";
-        if (!gArgs.IsArgSet("-version")) {
+
+        if (gArgs.IsArgSet("-version")) {
+            strUsage += FormatParagraph(LicenseInfo());
+        } else {
             strUsage += "\n"
                 "Usage:  bitcoin-tx [options] <hex-tx> [commands]  Update hex-encoded bitcoin transaction\n"
                 "or:     bitcoin-tx [options] -create [commands]   Create hex-encoded bitcoin transaction\n"
diff --git a/src/bitcoin-util.cpp b/src/bitcoin-util.cpp
index 973f4f2883..b457e0b354 100644
--- a/src/bitcoin-util.cpp
+++ b/src/bitcoin-util.cpp
@@ -53,7 +53,10 @@ static int AppInitUtil(ArgsManager& args, int argc, char* argv[])
     if (HelpRequested(args) || args.IsArgSet("-version")) {
         // First part of help message is specific to this utility
         std::string strUsage = PACKAGE_NAME " bitcoin-util utility version " + FormatFullVersion() + "\n";
-        if (!args.IsArgSet("-version")) {
+
+        if (args.IsArgSet("-version")) {
+            strUsage += FormatParagraph(LicenseInfo());
+        } else {
             strUsage += "\n"
                 "Usage:  bitcoin-util [options] [commands]  Do stuff\n";
             strUsage += "\n" + args.GetHelpMessage();
diff --git a/src/bitcoin-wallet.cpp b/src/bitcoin-wallet.cpp
index ff5485e2da..2f3dd45267 100644
--- a/src/bitcoin-wallet.cpp
+++ b/src/bitcoin-wallet.cpp
@@ -59,7 +59,10 @@ static bool WalletAppInit(ArgsManager& args, int argc, char* argv[])
     }
     if (argc < 2 || HelpRequested(args) || args.IsArgSet("-version")) {
         std::string strUsage = strprintf("%s bitcoin-wallet version", PACKAGE_NAME) + " " + FormatFullVersion() + "\n";
-        if (!args.IsArgSet("-version")) {
+
+        if (args.IsArgSet("-version")) {
+            strUsage += FormatParagraph(LicenseInfo());
+        } else {
             strUsage += "\n"
                         "bitcoin-wallet is an offline tool for creating and interacting with " PACKAGE_NAME " wallet files.\n"
                         "By default bitcoin-wallet will act on wallets in the default mainnet wallet directory in the datadir.\n"
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index 6432e8849d..9843382682 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -126,9 +126,10 @@ static bool AppInit(NodeContext& node, int argc, char* argv[])
     if (HelpRequested(args) || args.IsArgSet("-version")) {
         std::string strUsage = PACKAGE_NAME " version " + FormatFullVersion() + "\n";
 
-        if (!args.IsArgSet("-version")) {
-            strUsage += FormatParagraph(LicenseInfo()) + "\n"
-                "\nUsage:  bitcoind [options]                     Start " PACKAGE_NAME "\n"
+        if (args.IsArgSet("-version")) {
+            strUsage += FormatParagraph(LicenseInfo());
+        } else {
+            strUsage += "\nUsage:  bitcoind [options]                     Start " PACKAGE_NAME "\n"
                 "\n";
             strUsage += args.GetHelpMessage();
         }
diff --git a/src/clientversion.cpp b/src/clientversion.cpp
index 9b65952b02..192e9c52bc 100644
--- a/src/clientversion.cpp
+++ b/src/clientversion.cpp
@@ -3,9 +3,13 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <clientversion.h>
+#include <util/translation.h>
 
 #include <tinyformat.h>
 
+#include <sstream>
+#include <string>
+#include <vector>
 
 /**
  * Name of client reported in the 'version' message. Report the same name
@@ -72,3 +76,32 @@ std::string FormatSubVersion(const std::string& name, int nClientVersion, const
     ss << "/";
     return ss.str();
 }
+
+std::string CopyrightHolders(const std::string& strPrefix)
+{
+    const auto copyright_devs = strprintf(_(COPYRIGHT_HOLDERS).translated, COPYRIGHT_HOLDERS_SUBSTITUTION);
+    std::string strCopyrightHolders = strPrefix + copyright_devs;
+
+    // Make sure Bitcoin Core copyright is not removed by accident
+    if (copyright_devs.find("Bitcoin Core") == std::string::npos) {
+        strCopyrightHolders += "\n" + strPrefix + "The Bitcoin Core developers";
+    }
+    return strCopyrightHolders;
+}
+
+std::string LicenseInfo()
+{
+    const std::string URL_SOURCE_CODE = "<https://github.com/bitcoin/bitcoin>";
+
+    return CopyrightHolders(strprintf(_("Copyright (C) %i-%i").translated, 2009, COPYRIGHT_YEAR) + " ") + "\n" +
+           "\n" +
+           strprintf(_("Please contribute if you find %s useful. "
+                       "Visit %s for further information about the software.").translated, PACKAGE_NAME, "<" PACKAGE_URL ">") +
+           "\n" +
+           strprintf(_("The source code is available from %s.").translated, URL_SOURCE_CODE) +
+           "\n" +
+           "\n" +
+           _("This is experimental software.").translated + "\n" +
+           strprintf(_("Distributed under the MIT software license, see the accompanying file %s or %s").translated, "COPYING", "<https://opensource.org/licenses/MIT>") +
+           "\n";
+}
diff --git a/src/clientversion.h b/src/clientversion.h
index a39d96292d..d2efd7dcab 100644
--- a/src/clientversion.h
+++ b/src/clientversion.h
@@ -41,6 +41,11 @@ extern const std::string CLIENT_NAME;
 std::string FormatFullVersion();
 std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments);
 
+std::string CopyrightHolders(const std::string& strPrefix);
+
+/** Returns licensing information (for -version) */
+std::string LicenseInfo();
+
 #endif // WINDRES_PREPROC
 
 #endif // BITCOIN_CLIENTVERSION_H
diff --git a/src/init.cpp b/src/init.cpp
index 64ed868333..02ea30e28e 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -594,25 +594,6 @@ void SetupServerArgs(ArgsManager& argsman)
     argsman.AddHiddenArgs(hidden_args);
 }
 
-std::string LicenseInfo()
-{
-    const std::string URL_SOURCE_CODE = "<https://github.com/bitcoin/bitcoin>";
-
-    return CopyrightHolders(strprintf(_("Copyright (C) %i-%i").translated, 2009, COPYRIGHT_YEAR) + " ") + "\n" +
-           "\n" +
-           strprintf(_("Please contribute if you find %s useful. "
-                       "Visit %s for further information about the software.").translated,
-               PACKAGE_NAME, "<" PACKAGE_URL ">") +
-           "\n" +
-           strprintf(_("The source code is available from %s.").translated,
-               URL_SOURCE_CODE) +
-           "\n" +
-           "\n" +
-           _("This is experimental software.").translated + "\n" +
-           strprintf(_("Distributed under the MIT software license, see the accompanying file %s or %s").translated, "COPYING", "<https://opensource.org/licenses/MIT>") +
-           "\n";
-}
-
 static bool fHaveGenesis = false;
 static Mutex g_genesis_wait_mutex;
 static std::condition_variable g_genesis_wait_cv;
diff --git a/src/init.h b/src/init.h
index 1292cc1a3a..ddd439f619 100644
--- a/src/init.h
+++ b/src/init.h
@@ -70,7 +70,4 @@ bool AppInitMain(node::NodeContext& node, interfaces::BlockAndHeaderTipInfo* tip
  */
 void SetupServerArgs(ArgsManager& argsman);
 
-/** Returns licensing information (for -version) */
-std::string LicenseInfo();
-
 #endif // BITCOIN_INIT_H
diff --git a/src/util/system.cpp b/src/util/system.cpp
index 69811a751b..aa9122106b 100644
--- a/src/util/system.cpp
+++ b/src/util/system.cpp
@@ -1342,18 +1342,6 @@ int GetNumCores()
     return std::thread::hardware_concurrency();
 }
 
-std::string CopyrightHolders(const std::string& strPrefix)
-{
-    const auto copyright_devs = strprintf(_(COPYRIGHT_HOLDERS).translated, COPYRIGHT_HOLDERS_SUBSTITUTION);
-    std::string strCopyrightHolders = strPrefix + copyright_devs;
-
-    // Make sure Bitcoin Core copyright is not removed by accident
-    if (copyright_devs.find("Bitcoin Core") == std::string::npos) {
-        strCopyrightHolders += "\n" + strPrefix + "The Bitcoin Core developers";
-    }
-    return strCopyrightHolders;
-}
-
 // Obtain the application startup time (used for uptime calculation)
 int64_t GetStartupTime()
 {
diff --git a/src/util/system.h b/src/util/system.h
index a72ba3f3ed..f193c8ac0b 100644
--- a/src/util/system.h
+++ b/src/util/system.h
@@ -512,8 +512,6 @@ std::string HelpMessageOpt(const std::string& option, const std::string& message
  */
 int GetNumCores();
 
-std::string CopyrightHolders(const std::string& strPrefix);
-
 /**
  * On platforms that support it, tell the kernel the calling thread is
  * CPU-intensive and non-interactive. See SCHED_BATCH in sched(7) for details.
diff --git a/test/lint/lint-format-strings.py b/test/lint/lint-format-strings.py
index 47f40e2746..b814446125 100755
--- a/test/lint/lint-format-strings.py
+++ b/test/lint/lint-format-strings.py
@@ -16,7 +16,7 @@ FALSE_POSITIVES = [
     ("src/dbwrapper.cpp", "vsnprintf(p, limit - p, format, backup_ap)"),
     ("src/index/base.cpp", "FatalError(const char* fmt, const Args&... args)"),
     ("src/netbase.cpp", "LogConnectFailure(bool manual_connection, const char* fmt, const Args&... args)"),
-    ("src/util/system.cpp", "strprintf(_(COPYRIGHT_HOLDERS).translated, COPYRIGHT_HOLDERS_SUBSTITUTION)"),
+    ("src/clientversion.cpp", "strprintf(_(COPYRIGHT_HOLDERS).translated, COPYRIGHT_HOLDERS_SUBSTITUTION)"),
     ("src/validationinterface.cpp", "LogPrint(BCLog::VALIDATION, fmt \"\\n\", __VA_ARGS__)"),
     ("src/wallet/wallet.h",  "WalletLogPrintf(std::string fmt, Params... parameters)"),
     ("src/wallet/wallet.h", "LogPrintf((\"%s \" + fmt).c_str(), GetDisplayName(), parameters...)"),