[FIX] Preserve git commit hash in Homebrew and tarball-based builds

[x15sr71]

In raising this pull request, I confirm the following (please check boxes):

Reason for this PR:

• This PR adds new functionality.
• This PR fixes a bug that I have personally experienced or that a real user has reported and for which a sample exists.
• This PR is porting code from C to Rust.

Sanity check:

• I have read and understood the contributors guide.
• I have checked that another pull request for this purpose does not exist.
• If the PR adds new functionality, I've added it to the changelog. If it's just a bug fix, I have NOT added it to the changelog.
• I am NOT adding new C code unless it's to fix an existing, reproducible bug.

Repro instructions:

Homebrew

brew install ccextractor
ccextractor --version
# Git commit: Unknown  ← every macOS user sees this

---

Problem

Tarball-based builds (Homebrew, or any manual build from the released source tarball) have no .git directory at build time. The existing logic in pre-build.sh calls git rev-parse HEAD unconditionally — when .git is absent, this fails silently:

$ brew install ccextractor && ccextractor --version
Version: 0.96.5
Git commit: Unknown  ← broken

Every user installing via Homebrew or building from the released source tarball loses build provenance entirely.

Fix

Add explicit override path at the metadata generation point (pre-build.sh), not post-build output patching.

• mac/pre-build.sh, linux/pre-build.sh
  Check GIT_COMMIT_HASH_OVERRIDE env var first. If set, use it directly. Otherwise fall through to existing git logic unchanged.

• mac/build.command, linux/build
  New -commit-hash <value> argument exports GIT_COMMIT_HASH_OVERRIDE for pre-build.sh. Matches existing -system-libs pattern.

• src/CMakeLists.txt
GIT_COMMIT_HASH CMake CACHE STRING for -DGIT_COMMIT_HASH=<value>. Falls through to git when empty. Placed after BASE_PROJ_DIR definition.

• Source builds unaffected — override only taken when explicitly provided.

Testing

1. Normal source build (unchanged):

cd build && cmake ../src && ./ccextractor --version
Git commit: 6f0b781491fa7d6e646ce9a4c714bd5f1f7100c4  → real SHA

2. Tarball simulation (no .git, no override):

cd mac && mv ../.git ../.git.bak && bash pre-build.sh
Git command not present, trying folder approach
Commit: Unknown  → correct fallback

3. Override injection:

cd mac && GIT_COMMIT_HASH_OVERRIDE="v0.96.6" bash pre-build.sh
# Using injected commit hash: v0.96.6
# Commit: v0.96.6  → override works

4. Full Homebrew end-to-end (production path):

## Local tap with modified formula calling:
./build.command -system-libs -commit-hash v0.96.6
brew install local/test/ccextractor
ccextractor --version
Version: 0.96.5
Git commit: v0.96.6  → FIXED

---

Next step: Once this merges and a new release is cut, a Homebrew-core PR will add "-commit-hash", "v#{version}" to the formula's install block — at which point every future Homebrew bottle will carry the correct build provenance automatically.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on linux. Below is a summary of the test results, when compared to test for commit ad4886e...:

Report Name	Tests Passed
Broken	9/13
CEA-708	1/14
DVB	2/7
DVD	3/3
DVR-MS	2/2
General	22/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	77/86
Teletext	20/21
WTV	13/13
XDS	31/34

Your PR breaks these cases:

• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b...
• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2...
• ccextractor --autoprogram --out=ttxt --latin1 99e5eaafdc...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 7aad20907e...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65...
• ccextractor --autoprogram --out=ttxt --latin1 01509e4d27...
• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b...
• ccextractor --out=spupng c83f765c66...
• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9...
• ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla 85058ad37e...
• ccextractor --autoprogram --out=srt --latin1 --ucla b22260d065...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7...

NOTE: The following tests have been failing on the master branch as well as the PR:

• ccextractor --out=srt --latin1 --autoprogram 73d9313d64..., Last passed:

  Test 8738

• ccextractor --out=ttxt --latin1 001dd8cdf7..., Last passed:

  Test 8738

• ccextractor --out=srt --latin1 4d4e938ef6..., Last passed:

  Test 8738

• ccextractor --service 1 --out=txt --no-bom --no-rollup ea83ff7bcb..., Last passed:

  Test 8738

• ccextractor --service 1 --out=txt f17524b53f..., Last passed:

  Test 8738

• ccextractor --service 1 --out=txt 80848c45f8..., Last passed:

  Test 8738

• ccextractor --service 1 --out=txt --no-bom --no-rollup b5d6aad89f..., Last passed:

  Test 8738

• ccextractor --service 1[EUC-KR] --out=txt --no-rollup b5d6aad89f..., Last passed:

  Test 8738

• ccextractor --service 1 --out=srt da904de35d..., Last passed:

  Test 8738

• ccextractor --service 1 --out=sami da904de35d..., Last passed:

  Test 8738

• ccextractor --service 1 --out=ttxt da904de35d..., Last passed:

  Test 8926

• ccextractor --service 1[EUC-KR] b5d6aad89f..., Last passed:

  Test 8738

• ccextractor --service 1[EUC-KR] --no-rollup b5d6aad89f..., Last passed:

  Test 8738

• ccextractor --service all da904de35d..., Last passed:

  Test 8738

• ccextractor --service all[EUC-KR] b5d6aad89f..., Last passed:

  Test 8738

• ccextractor --service 1,2[UTF-8],3[EUC-KR],54 --out=txt da904de35d..., Last passed:

  Test 8738

• ccextractor --autoprogram --out=srt --latin1 f1422b8bfe..., Last passed:

  Test 9208

• ccextractor --autoprogram --out=srt --latin1 d41b53b504..., Last passed:

  Test 8738

• ccextractor --stdout --quiet --no-fontcolor 79a51f3500..., Last passed:

  Test 8738

• ccextractor --stdout --quiet --no-fontcolor 767b546f96..., Last passed:

  Test 8738

• ccextractor --service 1 c83f765c66..., Last passed:

  Test 8738

• ccextractor --myth c83f765c66..., Last passed:

  Test 8738

• ccextractor --in=raw fb79021542..., Last passed:

  Test 8738

• ccextractor --mp4vidtrack 5df914ce77..., Last passed:

  Test 8738

• ccextractor --xmltv=3 --out=null 96efd279cf..., Last passed:

  Test 8738

• ccextractor --datapid 2310 --autoprogram --out=srt --latin1 e639e54550..., Last passed:

  Test 8738

Congratulations: Merging this PR would fix the following tests:

• ccextractor --autoprogram --out=ttxt --latin1 132d7df7e9..., Last passed: Never
• ccextractor --autoprogram --out=srt --latin1 b22260d065..., Last passed: Never
• ccextractor --startcreditsnotafter 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never
• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.

[ccextractor-bot]

CCExtractor CI platform finished running the test files on windows. Below is a summary of the test results, when compared to test for commit ad4886e...:

Report Name	Tests Passed
Broken	9/13
CEA-708	1/14
DVB	3/7
DVD	3/3
DVR-MS	2/2
General	22/27
Hardsubx	1/1
Hauppage	3/3
MP4	3/3
NoCC	10/10
Options	81/86
Teletext	20/21
WTV	13/13
XDS	31/34

Your PR breaks these cases:

• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 8e8229b88b...
• ccextractor --autoprogram --out=ttxt --latin1 132d7df7e9...
• ccextractor --autoprogram --out=ttxt --latin1 99e5eaafdc...
• ccextractor --autoprogram --out=srt --latin1 b22260d065...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla 7aad20907e...
• ccextractor --autoprogram --out=ttxt --latin1 01509e4d27...
• ccextractor --autoprogram --out=ttxt --xds --latin1 --ucla 85058ad37e...
• ccextractor --autoprogram --out=srt --latin1 --ucla b22260d065...
• ccextractor --autoprogram --out=ttxt --latin1 --ucla --xds 7f41299cc7...

NOTE: The following tests have been failing on the master branch as well as the PR:

• ccextractor --out=srt --latin1 --autoprogram 73d9313d64..., Last passed:

  Test 8611

• ccextractor --out=ttxt --latin1 001dd8cdf7..., Last passed:

  Test 8611

• ccextractor --out=srt --latin1 4d4e938ef6..., Last passed:

  Test 8611

• ccextractor --service 1 --out=txt --no-bom --no-rollup ea83ff7bcb..., Last passed:

  Test 8611

• ccextractor --service 1 --out=txt f17524b53f..., Last passed:

  Test 8611

• ccextractor --service 1 --out=txt 80848c45f8..., Last passed:

  Test 8611

• ccextractor --service 1 --out=txt --no-bom --no-rollup b5d6aad89f..., Last passed:

  Test 8611

• ccextractor --service 1[EUC-KR] --out=txt --no-rollup b5d6aad89f..., Last passed:

  Test 8611

• ccextractor --service 1 --out=srt da904de35d..., Last passed:

  Test 8611

• ccextractor --service 1 --out=sami da904de35d..., Last passed:

  Test 8611

• ccextractor --service 1 --out=ttxt da904de35d..., Last passed:

  Test 8943

• ccextractor --service 1[EUC-KR] b5d6aad89f..., Last passed:

  Test 8611

• ccextractor --service 1[EUC-KR] --no-rollup b5d6aad89f..., Last passed:

  Test 8611

• ccextractor --service all da904de35d..., Last passed:

  Test 8611

• ccextractor --service all[EUC-KR] b5d6aad89f..., Last passed:

  Test 8611

• ccextractor --service 1,2[UTF-8],3[EUC-KR],54 --out=txt da904de35d..., Last passed:

  Test 8611

• ccextractor --autoprogram --out=srt --latin1 f1422b8bfe..., Last passed:

  Test 9209

• ccextractor --autoprogram --out=srt --latin1 d41b53b504..., Last passed:

  Test 8611

• ccextractor --stdout --quiet --no-fontcolor 79a51f3500..., Last passed:

  Test 8611

• ccextractor --stdout --quiet --no-fontcolor 767b546f96..., Last passed:

  Test 8611

• ccextractor --service 1 c83f765c66..., Last passed:

  Test 8611

• ccextractor --myth c83f765c66..., Last passed:

  Test 8611

• ccextractor --in=raw fb79021542..., Last passed:

  Test 8611

• ccextractor --mp4vidtrack 5df914ce77..., Last passed:

  Test 8611

• ccextractor --xmltv=3 --out=null 96efd279cf..., Last passed:

  Test 8611

• ccextractor --datapid 2310 --autoprogram --out=srt --latin1 e639e54550..., Last passed:

  Test 8611

Congratulations: Merging this PR would fix the following tests:

• ccextractor --autoprogram --out=srt --latin1 --quant 0 85271be4d2..., Last passed: Never
• ccextractor --autoprogram --out=ttxt --latin1 --ucla dab1c1bd65..., Last passed: Never
• ccextractor --out=srt --latin1 --autoprogram 29e5ffd34b..., Last passed: Never
• ccextractor --out=spupng c83f765c66..., Last passed: Never
• ccextractor --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never
• ccextractor --startcreditsnotbefore 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never
• ccextractor --startcreditsnotafter 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never
• ccextractor --startcreditsforatleast 1 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never
• ccextractor --startcreditsforatmost 2 --startcreditstext "CCextractor Start crdit Testing" c4dd893cb9..., Last passed: Never

It seems that not all tests were passed completely. This is an indication that the output of some files is not as expected (but might be according to you).

Check the result page for more info.