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Revision 2057d75038541cd16debb1c55f3f897fd244965c authored by Derrick Stolee on 17 September 2020, 18:11:42 UTC, committed by Junio C Hamano on 17 September 2020, 18:30:04 UTC 
maintenance: create basic maintenance runner
 
The 'gc' builtin is our current entrypoint for automatically maintaining
a repository. This one tool does many operations, such as repacking the
repository, packing refs, and rewriting the commit-graph file. The name
implies it performs "garbage collection" which means several different
things, and some users may not want to use this operation that rewrites
the entire object database.

Create a new 'maintenance' builtin that will become a more general-
purpose command. To start, it will only support the 'run' subcommand,
but will later expand to add subcommands for scheduling maintenance in
the background.

For now, the 'maintenance' builtin is a thin shim over the 'gc' builtin.
In fact, the only option is the '--auto' toggle, which is handed
directly to the 'gc' builtin. The current change is isolated to this
simple operation to prevent more interesting logic from being lost in
all of the boilerplate of adding a new builtin.

Use existing builtin/gc.c file because we want to share code between the
two builtins. It is possible that we will have 'maintenance' replace the
'gc' builtin entirely at some point, leaving 'git gc' as an alias for
some specific arguments to 'git maintenance run'.

Create a new test_subcommand helper that allows us to test if a certain
subcommand was run. It requires storing the GIT_TRACE2_EVENT logs in a
file. A negation mode is available that will be used in later tests.

Helped-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
1 parent 887952b
Raw File
csum-file.h 
#ifndef CSUM_FILE_H
#define CSUM_FILE_H

#include "hash.h"

struct progress;

/* A SHA1-protected file */
struct hashfile {
	int fd;
	int check_fd;
	unsigned int offset;
	git_hash_ctx ctx;
	off_t total;
	struct progress *tp;
	const char *name;
	int do_crc;
	uint32_t crc32;
	unsigned char buffer[8192];
};

/* Checkpoint */
struct hashfile_checkpoint {
	off_t offset;
	git_hash_ctx ctx;
};

void hashfile_checkpoint(struct hashfile *, struct hashfile_checkpoint *);
int hashfile_truncate(struct hashfile *, struct hashfile_checkpoint *);

/* finalize_hashfile flags */
#define CSUM_CLOSE		1
#define CSUM_FSYNC		2
#define CSUM_HASH_IN_STREAM	4

struct hashfile *hashfd(int fd, const char *name);
struct hashfile *hashfd_check(const char *name);
struct hashfile *hashfd_throughput(int fd, const char *name, struct progress *tp);
int finalize_hashfile(struct hashfile *, unsigned char *, unsigned int);
void hashwrite(struct hashfile *, const void *, unsigned int);
void hashflush(struct hashfile *f);
void crc32_begin(struct hashfile *);
uint32_t crc32_end(struct hashfile *);

/*
 * Returns the total number of bytes fed to the hashfile so far (including ones
 * that have not been written out to the descriptor yet).
 */
static inline off_t hashfile_total(struct hashfile *f)
{
	return f->total + f->offset;
}

static inline void hashwrite_u8(struct hashfile *f, uint8_t data)
{
	hashwrite(f, &data, sizeof(data));
}

static inline void hashwrite_be32(struct hashfile *f, uint32_t data)
{
	data = htonl(data);
	hashwrite(f, &data, sizeof(data));
}

#endif
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