diff options
Diffstat (limited to 'libfdisk/src/script.c')
| -rw-r--r-- | libfdisk/src/script.c | 117 |
1 files changed, 89 insertions, 28 deletions
diff --git a/libfdisk/src/script.c b/libfdisk/src/script.c index 66be4f08c..a28983dba 100644 --- a/libfdisk/src/script.c +++ b/libfdisk/src/script.c @@ -7,13 +7,33 @@ /** * SECTION: script * @title: Script - * @short_description: text based sfdisk compatible description of partition table + * @short_description: complex way to create and dump partition table * - * The libfdisk scripts are based on original sfdisk script (dumps). Each + * This interface allows to compose in-memory partition table with all details, + * write all partition table description to human readable text file, read it + * from the file, and apply the script to on-disk label. + * + * The libfdisk scripts are based on original sfdisk script (dumps). Each * script has two parts: script headers and partition table entries - * (partitions). + * (partitions). The script is possible to dump in JSON too (read JSON is not + * implemented yet). * * For more details about script format see sfdisk man page. + * + * There are four ways how to build the script: + * + * - read the current on-disk partition table by fdisk_script_read_context()) + * - read it from text file by fdisk_script_read_file() + * - read it interactively from user by fdisk_script_read_line() and fdisk_script_set_fgets() + * - manually in code by fdisk_script_set_header() and fdisk_script_set_table() + * + * The read functions fdisk_script_read_context() and fdisk_script_read_file() + * creates always a new script partition table. The table (see + * fdisk_script_get_table()) is possible to modify by standard + * fdisk_table_...() functions and then apply by fdisk_apply_script(). + * + * Note that script API is fully non-interactive and forces libfdisk to not use + * standard dialog driven partitioning as we have in fdisk(8). */ /* script header (e.g. unit: sectors) */ @@ -41,6 +61,8 @@ struct fdisk_script { force_label : 1; /* label: <name> specified */ }; +static struct fdisk_parttype *translate_type_shortcuts(struct fdisk_script *dp, char *str); + static void fdisk_script_free_header(struct fdisk_scriptheader *fi) { @@ -76,12 +98,6 @@ struct fdisk_script *fdisk_new_script(struct fdisk_context *cxt) dp->cxt = cxt; fdisk_ref_context(cxt); - dp->table = fdisk_new_table(); - if (!dp->table) { - fdisk_unref_script(dp); - return NULL; - } - INIT_LIST_HEAD(&dp->headers); return dp; } @@ -148,8 +164,9 @@ static void fdisk_reset_script(struct fdisk_script *dp) assert(dp); DBG(SCRIPT, ul_debugobj(dp, "reset")); - fdisk_unref_table(dp->table); - dp->table = NULL; + + if (dp->table) + fdisk_reset_table(dp->table); while (!list_empty(&dp->headers)) { struct fdisk_scriptheader *fi = list_entry(dp->headers.next, @@ -317,16 +334,58 @@ int fdisk_script_set_header(struct fdisk_script *dp, * fdisk_script_get_table: * @dp: script * - * The table (container with partitions) is possible to create by - * fdisk_script_read_context() or fdisk_script_read_file(), otherwise - * this function returns NULL. + * The table represents partitions holded by the script. The table is possible to + * fill by fdisk_script_read_context() or fdisk_script_read_file(). All the "read" + * functions remove old partitions from the table. See also fdisk_script_set_table(). * - * Returns: NULL or script. + * Returns: NULL or script table. */ struct fdisk_table *fdisk_script_get_table(struct fdisk_script *dp) { assert(dp); - return dp ? dp->table : NULL; + + if (!dp->table) + /* + * Make sure user has access to the same table as script. If + * there is no table then create a new one and reuse it later. + */ + dp->table = fdisk_new_table(); + + return dp->table; +} + +/** + * fdisk_script_set_table: + * @dp: script + * @tb: table + * + * Replaces table used by script and creates a new reference to @tb. This + * function allows to generate a new script table independently on the current + * context and without any file reading. + * + * This is useful for example to create partition table with the same basic + * settings (e.g. label-id, ...) but with different partitions -- just call + * fdisk_script_read_context() to get current settings and then + * fdisk_script_set_table() to set a different layout. + * + * If @tb is NULL then the current script table is unreferenced. + * + * Note that script read_ functions (e.g. fdisk_script_read_context()) create + * always a new script table. + * + * Returns: 0 on success, <0 on error + */ +int fdisk_script_set_table(struct fdisk_script *dp, struct fdisk_table *tb) +{ + if (!dp) + return -EINVAL; + + fdisk_ref_table(tb); + fdisk_unref_table(dp->table); + dp->table = tb; + + DBG(SCRIPT, ul_debugobj(dp, "table replaced")); + return 0; } static struct fdisk_label *script_get_label(struct fdisk_script *dp) @@ -377,7 +436,7 @@ int fdisk_script_has_force_label(struct fdisk_script *dp) * @cxt: context * * Reads data from the @cxt context (on disk partition table) into the script. - * If the context is no specified than defaults to context used for fdisk_new_script(). + * If the context is not specified then defaults to context used for fdisk_new_script(). * * Return: 0 on success, <0 on error. */ @@ -400,7 +459,7 @@ int fdisk_script_read_context(struct fdisk_script *dp, struct fdisk_context *cxt if (!lb) return -EINVAL; - /* allocate and fill new table */ + /* allocate (if not yet) and fill table */ rc = fdisk_get_partitions(cxt, &dp->table); if (rc) return rc; @@ -542,7 +601,7 @@ static int write_file_json(struct fdisk_script *dp, FILE *f) } - if (!dp->table) { + if (!dp->table || fdisk_table_is_empty(dp->table)) { DBG(SCRIPT, ul_debugobj(dp, "script table empty")); goto done; } @@ -651,7 +710,7 @@ static int write_file_sfdisk(struct fdisk_script *dp, FILE *f) devname = fi->data; } - if (!dp->table) { + if (!dp->table || fdisk_table_is_empty(dp->table)) { DBG(SCRIPT, ul_debugobj(dp, "script table empty")); return 0; } @@ -911,6 +970,7 @@ static int parse_line_nameval(struct fdisk_script *dp, char *s) assert(dp); assert(s); + assert(dp->table); DBG(SCRIPT, ul_debugobj(dp, " parse script line: '%s'", s)); @@ -996,8 +1056,11 @@ static int parse_line_nameval(struct fdisk_script *dp, char *s) rc = next_string(&p, &type); if (rc) break; - pa->type = fdisk_label_parse_parttype( - script_get_label(dp), type); + + pa->type = translate_type_shortcuts(dp, type); + if (!pa->type) + pa->type = fdisk_label_parse_parttype( + script_get_label(dp), type); free(type); if (!pa->type) { @@ -1106,6 +1169,7 @@ static int parse_line_valcommas(struct fdisk_script *dp, char *s) assert(dp); assert(s); + assert(dp->table); pa = fdisk_new_partition(); if (!pa) @@ -1240,11 +1304,8 @@ static int fdisk_script_read_buffer(struct fdisk_script *dp, char *s) if (!s || !*s) return 0; /* nothing baby, ignore */ - if (!dp->table) { - dp->table = fdisk_new_table(); - if (!dp->table) - return -ENOMEM; - } + if (!dp->table && fdisk_script_get_table(dp) == NULL) + return -ENOMEM; /* parse header lines only if no partition specified yet */ if (fdisk_table_is_empty(dp->table) && is_header_line(s)) @@ -1569,7 +1630,7 @@ static int test_stdin(struct fdisk_test *ts, int argc, char *argv[]) printf("<start>, <size>, <type>, <bootable: *|->\n"); do { struct fdisk_partition *pa; - size_t n = fdisk_table_get_nents(dp->table); + size_t n = dp->table ? fdisk_table_get_nents(dp->table) : 0; printf(" #%zu :\n", n + 1); rc = fdisk_script_read_line(dp, stdin, buf, sizeof(buf)); |