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--- git_gc [2019/03/02 08:02] – created rpjday
+++ git_gc [2019/03/07 09:46] (current) – [Examples] rpjday
@@ Line 2: / Line 2: @@
 How to clean up dangling and unreachable objects.
+Links:
+  * [[https://stackoverflow.com/questions/3765234/listing-and-deleting-git-commits-that-are-under-no-branch-dangling/4528593#4528593|Stack Overflow posting]]
+===== SYNOPSIS =====
+<code>
+git gc
+  [--aggressive]
+  [--auto]
+  [--quiet]
+  [--prune=<date> | --no-prune]
+  [--force]
+  [--keep-largest-pack]
+</code>
+===== OPTIONS =====
+In part:
+<code>
+--prune=<date>
+    Prune loose objects older than date (default is 2 weeks
+    ago, overridable by the config variable gc.pruneExpire).
+    --prune=all prunes loose objects regardless of their age
+    and increases the risk of corruption if another process is
+    writing to the repository concurrently; see "NOTES" below.
+    --prune is on by default.
+--no-prune
+    Do not prune any loose objects.
+</code>
+===== Examples =====
+Current situation:
+<code>
+$ git fsck
+Checking object directories: 100% (256/256), done.
+Checking objects: 100% (11352/11352), done.
+dangling blob 4e811469e1f97f114ed2d3e42fdcec1aedbad174
+dangling blob 2384122beb433045ec091b5131d294b55fe7fb43
+dangling blob db93da5493a753c01d87d665beb748ac255c8547
+dangling blob af96a0d3d093de55ddcad81ed92773a179465d9f
+dangling commit 659d5f247d9b3d4005d9e074f960e473bb0cf09b
+dangling blob e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
+dangling blob e7a8f5a79753b9ebebb84b8c8d406316cef48aa6
+dangling commit 8b31c7b18e22fddca50eb9af706b6927f2c14ddc
+dangling commit 75b483ba05490108f06710e0fcd3d2e85ab94e32
+dangling blob 00438efa2c06aa0599b829129850f2a5eca0d3fd
+dangling commit f14813a6d31ad17c991b93b6f19ff353c342cbea
+dangling commit 85cfb058693ce54607314c623162af596aa3025b
+dangling blob ead0457b9cab88d57b051654169fd6b81911602e
+dangling commit d05129499209565b48b609321890ecb868c3b154
+dangling blob c9d75ddf04398095b2842a8332716d7f4f9d20d7
+dangling blob 2b5f8d6ff4282c47204bdd59c4a59a4827f2bd46
+dangling commit 69fd5e6a8733ed63293aab658d584150c0af9db2
+$
+</code>
+Regular cleaning:
+<code>
+$ git gc
+Enumerating objects: 11352, done.
+Counting objects: 100% (11352/11352), done.
+Delta compression using up to 8 threads
+Compressing objects: 100% (4140/4140), done.
+Writing objects: 100% (11352/11352), done.
+Total 11352 (delta 6871), reused 11352 (delta 6871)
+$
+</code>
+End result -- no change:
+<code>
+$ git fsck
+Checking object directories: 100% (256/256), done.
+Checking objects: 100% (11352/11352), done.
+dangling blob 4e811469e1f97f114ed2d3e42fdcec1aedbad174
+dangling blob 2384122beb433045ec091b5131d294b55fe7fb43
+dangling blob db93da5493a753c01d87d665beb748ac255c8547
+dangling blob af96a0d3d093de55ddcad81ed92773a179465d9f
+dangling commit 659d5f247d9b3d4005d9e074f960e473bb0cf09b
+dangling blob e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
+dangling blob e7a8f5a79753b9ebebb84b8c8d406316cef48aa6
+dangling commit 8b31c7b18e22fddca50eb9af706b6927f2c14ddc
+dangling blob 00438efa2c06aa0599b829129850f2a5eca0d3fd
+dangling commit f14813a6d31ad17c991b93b6f19ff353c342cbea
+dangling commit 85cfb058693ce54607314c623162af596aa3025b
+dangling blob ead0457b9cab88d57b051654169fd6b81911602e
+dangling commit d05129499209565b48b609321890ecb868c3b154
+dangling blob c9d75ddf04398095b2842a8332716d7f4f9d20d7
+dangling blob 2b5f8d6ff4282c47204bdd59c4a59a4827f2bd46
+dangling commit 69fd5e6a8733ed63293aab658d584150c0af9db2
+$
+</code>
+Prune now:
+<code>
+$ git gc --prune=now
+Enumerating objects: 11352, done.
+Counting objects: 100% (11352/11352), done.
+Delta compression using up to 8 threads
+Compressing objects: 100% (4140/4140), done.
+Writing objects: 100% (11352/11352), done.
+Total 11352 (delta 6871), reused 11352 (delta 6871)
+$
+</code>
+All gone:
+<code>
+$ git fsck
+Checking object directories: 100% (256/256), done.
+Checking objects: 100% (11352/11352), done.
+$
+</code>
+Clearing the reflog first:
+<code>
+$ git reflog expire --expire=now --expire-unreachable=now --all
+$ git gc --prune=now
+</code>