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prune: strategies for linked checkouts

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(alias R=$GIT_COMMON_DIR/worktrees/<id>)

 - linked checkouts are supposed to keep its location in $R/gitdir up
   to date. The use case is auto fixup after a manual checkout move.

 - linked checkouts are supposed to update mtime of $R/gitdir. If
   $R/gitdir's mtime is older than a limit, and it points to nowhere,
   worktrees/<id> is to be pruned.

 - If $R/locked exists, worktrees/<id> is not supposed to be pruned. If
   $R/locked exists and $R/gitdir's mtime is older than a really long
   limit, warn about old unused repo.

 - "git checkout --to" is supposed to make a hard link named $R/link
   pointing to the .git file on supported file systems to help detect
   the user manually deleting the checkout. If $R/link exists and its
   link count is greated than 1, the repo is kept.

Helped-by: Marc Branchaud <marcnarc@xiplink.com>
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Helped-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Marc Branchaud <marcnarc@xiplink.com>
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2014-11-30 15:24:48 +07:00
committed by Junio C Hamano
parent 529fef20cf
commit 23af91d102
7 changed files with 251 additions and 2 deletions
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13
setup.c
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@ -390,6 +390,17 @@ static int check_repository_format_gently(const char *gitdir, int *nongit_ok)
return ret;
}
static void update_linked_gitdir(const char *gitfile, const char *gitdir)
{
struct strbuf path = STRBUF_INIT;
struct stat st;
strbuf_addf(&path, "%s/gitfile", gitdir);
if (stat(path.buf, &st) || st.st_mtime + 24 * 3600 < time(NULL))
write_file(path.buf, 0, "%s\n", gitfile);
strbuf_release(&path);
}
/*
* Try to read the location of the git directory from the .git file,
* return path to git directory if found.
@ -438,6 +449,8 @@ const char *read_gitfile(const char *path)
if (!is_git_directory(dir))
die("Not a git repository: %s", dir);
update_linked_gitdir(path, dir);
path = real_path(dir);
free(buf);