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ac5409e420
This adds -d flag to update-ref to allow safe deletion of ref.
Before deleting it, the command checks if the given <oldvalue>
still matches the value the caller thought the ref contained.
Similarly, it also accepts 0{40} or an empty string as <oldvalue>
to allow safe creation of a new ref.
Signed-off-by: Junio C Hamano <junkio@cox.net>
72 lines
1.5 KiB
C
72 lines
1.5 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "builtin.h"
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static const char git_update_ref_usage[] =
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"git-update-ref [-m <reason>] (-d <refname> <value> | <refname> <value> [<oldval>])";
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int cmd_update_ref(int argc, const char **argv, const char *prefix)
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{
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const char *refname=NULL, *value=NULL, *oldval=NULL, *msg=NULL;
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struct ref_lock *lock;
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unsigned char sha1[20], oldsha1[20];
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int i, delete;
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delete = 0;
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setup_ident();
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git_config(git_default_config);
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for (i = 1; i < argc; i++) {
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if (!strcmp("-m", argv[i])) {
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if (i+1 >= argc)
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usage(git_update_ref_usage);
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msg = argv[++i];
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if (!*msg)
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die("Refusing to perform update with empty message.");
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if (strchr(msg, '\n'))
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die("Refusing to perform update with \\n in message.");
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continue;
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}
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if (!strcmp("-d", argv[i])) {
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delete = 1;
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continue;
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}
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if (!refname) {
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refname = argv[i];
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continue;
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}
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if (!value) {
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value = argv[i];
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continue;
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}
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if (!oldval) {
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oldval = argv[i];
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continue;
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}
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}
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if (!refname || !value)
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usage(git_update_ref_usage);
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if (get_sha1(value, sha1))
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die("%s: not a valid SHA1", value);
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if (delete) {
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if (oldval)
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usage(git_update_ref_usage);
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return delete_ref(refname, sha1);
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}
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hashclr(oldsha1);
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if (oldval && *oldval && get_sha1(oldval, oldsha1))
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die("%s: not a valid old SHA1", oldval);
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lock = lock_any_ref_for_update(refname, oldval ? oldsha1 : NULL);
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if (!lock)
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return 1;
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if (write_ref_sha1(lock, sha1, msg) < 0)
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return 1;
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/* write_ref_sha1 always unlocks the ref, no need to do it explicitly */
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return 0;
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}
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